【Linux】SYSCALL_DEFINE4 openat执行流程摸索

因缘而起12024-07-21 17:07

在上一篇博客，我们基于pr_info这个内核类似c语言printf打印宏完成了打印，基本实现了自由开关打印，可以设定打印日志次数（代码写了，大概10行代码），在测试的时候发现居然还有意外收获，doge....

在前一阵子，本来想摸索内核openat的执行流程，一直不成功，是什么原因呢？这个问题有点奇怪，当时看到的现象就是Ubuntu可以进入到图形模式，但是就是进入不了桌面，一直在那转圈圈。

由于现在我们开发了一个pr_info_self，有了这个小刀，那必须试试这个小刀能不能深入解剖内核这头牛。。。

基于对openat这个系统调用源码的理解，合入了这样些代码：

登录 - Gitee.comhttps://gitee.com/r77683962/linux-6.9.0/commit/8acf470e1b3b093912a984467e96fa78d87c06ac

然后打印的详细日志如下（这个文件1150706行，内核日志量还是比较大的）：

登录 - Gitee.comhttps://gitee.com/r77683962/linux-6.9.0/raw/8acf470e1b3b093912a984467e96fa78d87c06ac/test_log/syslog_openat2_detail.txt

从这个日志来看一共调用了1283次__do_sys_openat这个系统调用，注意1532这个行，也是跟日志能对上的。

下边这是刚才搜索到1283次结果的最后记录，这里有一点需要注意：

第一条记录打印的时间：2024-07-17 16:49:15.159705

最后一条记录打印的时间：2024-07-17 16:49:22.733054，就在7.6秒左右的时间内，内核一共调用了1283次openat这个系统调用，而在这两次打印之间的日志行数是：

开始日志行：5311

结束日志行：1150678

相差了114.5万行的样子，就这个角度来看，猜测操作系统是不是因为这个原因崩溃了？

基于linux-6.9.0/commit/8acf470e1b3b093912a984467e96fa78d87c06ac这个合入hash值，打印的openat代码级执行流程日志是这样的：

bash 复制代码 
16:49:15.159704: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.159705: [fs/open.c __do_sys_openat 1532 DEFAULT] count: 656835
16:49:15.159706: [fs/open.c do_sys_openat2 1437 DEFAULT] tmp->name: /etc/machine-id
16:49:15.159707: [fs/file.c alloc_fd 505 DEFAULT] allocate a file descriptor, mark it busy. tgid: 2661, pid: 2661
16:49:15.159709: [fs/namei.c do_filp_open 3841 DEFAULT] pathname: /etc/machine-id
16:49:15.159710: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.159711: [fs/namei.c path_openat 3800 DEFAULT] alloc_empty_file
16:49:15.159712: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.159713: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.159714: [fs/file_table.c alloc_empty_file 192 DEFAULT] alloc_empty_file
16:49:15.159716: [fs/file_table.c init_file 152 DEFAULT] security_file_alloc
16:49:15.159717: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.159718: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.159719: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.159721: [fs/namei.c link_path_walk 2260 DEFAULT] name: /etc/machine-id
16:49:15.159722: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.159723: [fs/namei.c complete_walk 886 DEFAULT] complete_walk
16:49:15.159724: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.159725: [fs/namei.c may_open 3250 DEFAULT] 
16:49:15.159726: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.159739: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.159741: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.159742: [fs/file.c fd_install 612 DEFAULT] 
16:49:15.159743: [fs/namei.c putname 262 DEFAULT] name: /etc/machine-id
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16:49:15.159745: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.159746: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.159747: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.159749: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160050: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160055: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.160056: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160058: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160059: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160060: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160062: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.160071: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160072: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160073: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160074: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.160076: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160077: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160078: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160079: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.160080: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.160087: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160089: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160090: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.160091: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160092: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160094: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160107: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160108: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160109: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160110: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160112: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.160113: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160114: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.160115: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.160117: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160118: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.160119: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.160120: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160121: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.160123: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160124: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160125: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160126: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160128: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.160130: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.160138: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160139: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160140: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160141: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160142: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.160145: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.160146: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.160153: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160154: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160155: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160157: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160168: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.160170: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160171: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160172: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160173: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160175: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.160176: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.160177: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.160179: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.160183: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.160184: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160185: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160186: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160187: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160189: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.160191: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.160199: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160200: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160308: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
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16:49:15.160324: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160325: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160326: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160327: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160353: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.160355: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160356: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160358: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.160401: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.160404: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.160405: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.160406: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.162911: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163149: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163154: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
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16:49:15.163162: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.163236: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163237: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163239: [fs/namei.c path_init 2364 DEFAULT] path_init
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16:49:15.163254: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.163258: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163260: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.163261: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163262: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163264: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163265: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163266: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.163270: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163271: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.163282: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163283: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163284: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163286: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163287: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.163292: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.163293: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163294: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.163434: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163438: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.163440: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163441: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163443: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163444: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163445: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.163452: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.163460: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.163465: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163659: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163666: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163668: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.163686: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.163687: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163688: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163689: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163692: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163695: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163698: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.163704: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163905: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.163928: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163932: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.163938: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.163941: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163944: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.163970: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.163974: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163976: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.163980: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
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16:49:15.163993: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.163994: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.164077: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164079: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164083: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164100: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164106: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164109: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164111: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.164124: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164126: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.164152: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164156: [fs/namei.c path_init 2364 DEFAULT] path_init
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16:49:15.164163: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.164172: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164175: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.164468: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164477: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164480: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164484: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164487: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164490: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164494: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.164503: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
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16:49:15.164508: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164509: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.164513: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164515: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164516: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164517: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164520: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164524: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164527: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.164530: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.164553: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164557: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164558: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164562: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164565: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164567: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164613: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.164615: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164617: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.164618: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.164620: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164622: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.164627: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164628: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164630: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164631: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164634: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164637: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164641: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164644: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164648: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164651: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.164655: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.164658: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.164669: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164670: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164672: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164673: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164674: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164675: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164679: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.164683: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.164686: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164687: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164688: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.164691: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164695: [fs/open.c __do_sys_openat 1532 DEFAULT] count: 656836
16:49:15.164698: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164702: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164706: [fs/open.c do_sys_openat2 1437 DEFAULT] tmp->name: /etc/machine-id
16:49:15.164709: [fs/file.c alloc_fd 505 DEFAULT] allocate a file descriptor, mark it busy. tgid: 2661, pid: 2661
16:49:15.164727: [fs/namei.c do_filp_open 3841 DEFAULT] pathname: /etc/machine-id
16:49:15.164731: [fs/namei.c path_openat 3800 DEFAULT] alloc_empty_file
16:49:15.164735: [fs/file_table.c alloc_empty_file 192 DEFAULT] alloc_empty_file
16:49:15.164738: [fs/file_table.c init_file 152 DEFAULT] security_file_alloc
16:49:15.164740: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164800: [fs/namei.c link_path_walk 2260 DEFAULT] name: /etc/machine-id
16:49:15.164804: [fs/namei.c complete_walk 886 DEFAULT] complete_walk
16:49:15.164806: [fs/namei.c may_open 3250 DEFAULT] 
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16:49:15.164818: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.164846: [fs/file.c fd_install 612 DEFAULT] 
16:49:15.164848: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.164849: [fs/namei.c putname 262 DEFAULT] name: /etc/machine-id
16:49:15.164850: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.164856: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164859: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.164863: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.164866: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.164868: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.164871: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.164875: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.164878: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.164920: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.165211: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.165213: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165215: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165216: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165217: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.165230: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165231: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165233: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165234: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165235: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165237: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.165318: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.165345: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165346: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.165355: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.165371: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.165374: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165378: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165381: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165385: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.165401: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.165404: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165408: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165411: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165413: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165462: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165466: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.165480: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165483: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165487: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.165490: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165494: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165497: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165501: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165505: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.165519: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165520: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.165523: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.165531: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
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16:49:15.165535: [mm/slub.c __slab_alloc 3613 DEFAULT] 
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16:49:15.165612: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.165614: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165615: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165617: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165619: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165620: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165878: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.165911: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165913: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.165914: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.165930: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.165934: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165940: [fs/open.c __do_sys_openat 1532 DEFAULT] count: 656837
16:49:15.165942: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.165944: [fs/open.c do_sys_openat2 1437 DEFAULT] tmp->name: /etc/machine-id
16:49:15.165946: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165947: [fs/file.c alloc_fd 505 DEFAULT] allocate a file descriptor, mark it busy. tgid: 2661, pid: 2661
16:49:15.165948: [fs/namei.c do_filp_open 3841 DEFAULT] pathname: /etc/machine-id
16:49:15.165950: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.165953: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.165956: [fs/namei.c path_openat 3800 DEFAULT] alloc_empty_file
16:49:15.165960: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.165963: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.165967: [fs/file_table.c alloc_empty_file 192 DEFAULT] alloc_empty_file
16:49:15.165970: [fs/file_table.c init_file 152 DEFAULT] security_file_alloc
16:49:15.165974: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.165978: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.165981: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.165985: [fs/namei.c link_path_walk 2260 DEFAULT] name: /etc/machine-id
16:49:15.165986: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.165989: [fs/namei.c complete_walk 886 DEFAULT] complete_walk
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16:49:15.165999: message repeated 2 times: [ [fs/dcache.c dput 838 DEFAULT] ]
16:49:15.166004: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.166033: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.166037: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.166038: [fs/file.c fd_install 612 DEFAULT] 
16:49:15.166040: [fs/namei.c putname 262 DEFAULT] name: /etc/machine-id
16:49:15.166041: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.166042: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.166044: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.166045: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.166076: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.166078: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.166082: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.166084: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.166087: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.166164: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.166165: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.166170: message repeated 2 times: [ [fs/dcache.c dput 838 DEFAULT] ]
16:49:15.166172: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.166176: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.166178: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.166181: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.166183: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.166186: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.166187: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.166189: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.166190: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.166191: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.166214: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
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16:49:15.166221: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
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16:49:15.166228: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.166231: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.166235: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.166238: [fs/dcache.c dput 838 DEFAULT] 
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16:49:15.166240: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.166243: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.166244: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.166246: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.166248: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.166249: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.166253: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.166257: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.166259: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.166261: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.166264: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.166268: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.166271: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.166275: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.166376: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.166406: [fs/namei.c path_put 566 DEFAULT] 
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16:49:15.166410: [fs/namespace.c mntput 1361 DEFAULT] 
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16:49:15.168536: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168538: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168539: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168540: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168541: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168542: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168543: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168544: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168545: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168547: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.168548: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168550: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168551: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168552: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168554: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168555: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168556: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168557: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168558: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168560: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168561: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168562: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168631: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168634: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.168636: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168637: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168638: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168639: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168641: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168642: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.168644: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168645: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168646: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168648: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168649: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168650: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168651: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168653: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168654: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168655: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168657: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168658: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168659: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.168661: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168662: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168663: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.168664: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168665: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168667: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168668: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168670: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168787: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168902: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168906: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168907: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168908: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.168910: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168911: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168912: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.168916: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168917: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168923: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168924: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168926: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168927: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168929: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168930: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168932: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168933: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168934: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168936: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168937: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168939: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.168940: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168941: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168943: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168944: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168945: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168947: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168948: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168950: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168951: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168952: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168953: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168955: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168956: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168957: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.168959: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168960: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168961: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168962: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.168964: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168965: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.168966: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168968: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168969: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168970: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.168972: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.168974: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.168975: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.168977: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.168979: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169066: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169070: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169072: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169073: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169075: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169076: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169077: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169079: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169080: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169082: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169083: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169084: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169086: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169089: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169090: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169142: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169146: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169148: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169149: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169151: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169152: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169153: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169155: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169156: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169158: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169160: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169161: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169162: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.169164: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169165: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169166: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169167: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169169: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169170: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169171: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169172: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169174: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169175: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169177: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169219: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169222: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169224: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169225: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169226: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169227: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.169228: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169229: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169231: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169232: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169233: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169235: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169236: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169237: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169239: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169240: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169287: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169397: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169400: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169402: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169403: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169404: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.169405: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169406: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169407: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169408: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169410: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169411: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169412: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169413: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169414: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169417: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169418: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169420: [include/linux/fs.h __sb_start_write 1666 DEFAULT] __sb_start_write
16:49:15.169543: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169546: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169547: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169548: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169550: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.169551: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169552: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169553: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169555: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169556: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169557: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169558: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169559: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169560: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169561: [fs/namei.c path_init 2364 DEFAULT] path_init
16:49:15.169563: [fs/namei.c path_lookupat 2486 DEFAULT] path_lookupat
16:49:15.169564: [fs/namei.c link_path_walk 2260 DEFAULT] name: /run/systemd/journal/flushed
16:49:15.169565: [mm/slub.c __slab_alloc 3613 DEFAULT] 
16:49:15.169566: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169567: [fs/namei.c link_path_walk 2260 DEFAULT] name: (efault)
16:49:15.169568: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169569: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169570: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169572: [fs/namei.c path_put 566 DEFAULT] 
16:49:15.169573: [fs/dcache.c dput 838 DEFAULT] 
16:49:15.169574: [fs/namespace.c mntput 1361 DEFAULT] 
16:49:15.169575: [fs/namei.c putname 262 DEFAULT] name: /run/systemd/journal/flushed

要注意，上边这日志量其实挺大，有兴趣的可以基于这个日志打印信息对照代码流程。

但打印日志也有些不是文件操作的日志，需要注意下，对于学习是比较有用的。

我们把这些日志的前几行转化为代码级，就像下边这样的，不过只举了几个例子。

有了这个pr_info_self宏后，从方便性来讲，其实提升不少，灵活性更强。

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