tree 18f954b79df3f7918efcd7804439de482b563e11
parent 979931803b5ba3a19db6e2ff3971f8447147fb8e
author Josh Gao <jmgao@google.com> 1524100261 -0700
committer Josh Gao <jmgao@google.com> 1525297430 -0700

tombstoned: don't create tombstones for failed dumps.

Instead of creating tombstone FDs in place and passing them out to
crash_dump directly, create them as O_TMPFILEs and link them into place
when crash_dump reports success, to avoid creating empty tombstones
in cases like an aborting thread racing with another thread that
manages to cleanly exit_group before the dump finishes.

Bug: http://b/77729983
Test: debuggerd_test
Test: adb shell 'for x in `seq 0 50`; do crasher; done'
Change-Id: I31ce4fd4a524abf8bde57152450209483d9d0ba9
(cherry picked from commit 48383c806af629bb755ce120ba30e8cb70eb5f23)