Handling race condition when dumping heaps.
1. The IPC to ActivityThread.dumpHeap() dups the input file descriptor but
closes it when the IPC returns. Since the heap dump is generated
asynchronously, a race condition ensues between the returning close and
the dump being generated. For the intra-system-process call, the race is
with ActivityManagerService closing the created file descriptor. Duping
the file descriptor on the ActivityThread side should deal with this.
2. For some reason, the file descriptor wasn't closed for native heap
dumps. Closing the fd in those cases as well.
3. Catch the RuntimeException from Debug.dumpHprofData in case anything
else was missed.
Bug: 133424499
Test: adb shell am dumpheap com.android.systemui
Test: adb shell am dumpheap system
Test: Use the "Capture System Heap Dump" option in Developer Settings
Change-Id: I44817161533359766250de04e35902587ea9cc40
1 file changed