tree 5afff3c97de1458886154aa5e84e1c0ae0edf11f
parent d30feca670d0af02783bbdfd4a29c5078c18bdc5
author Mathieu Chartier <mathieuc@google.com> 1419043307 -0800
committer Mathieu Chartier <mathieuc@google.com> 1420582338 -0800

Don't allow suspension from FindLocksAtDexPc

Transitioning to suspended from runnable sometimes runs dump
checkpoints in ThreadStress which can cause deadlocks. This happens
since FindLocksAtDexPC runs the verifier which calls
AllowThreadSuspension. This results in a blocked thread which holds
the monitor lock, and if another thread tries to do a monitor enter,
it deadlocks while holding the mutator lock (assuming the GC is
suspending all).

The fix for avoiding this deadlock is not calling
AllowThreadSuspension from FindLocksAtDexPc.

Bug: 18576985
Change-Id: I7e5faaf3bbbd5b5f680de95d53c33b5106705b0c