memory泄露分析方法(FD泄漏篇)

fd leak 导致SystemServer crash

F DEBUG : Abort message: 'aborting due to fd leak: most common stack [size 712] = 04-03
F DEBUG : 0: dup+216
F DEBUG : 1: native_handle_clone+136
F DEBUG : 2: _ZN6vendor3qti8hardware7display6mapper4V4_014implementation9QtiMapper12importBufferERKN7android8hardware11hidl_handleENSt3__18functionIFvNS8_8graphics6mapper4V4_05ErrorEPvEEE+76

fd泄漏到最大值时候，fdtrack会1次性打印出所有fd申请的调用堆栈并抓取hprof文件：

system_server: hprof: heap dump "/data/system/heapdump/fdtrack-2026-04-03-06-42-47.hprof"

从hprof文件中查看有无异常的surface，buffer等对象，最终找到原因