https://bugs.kde.org/show_bug.cgi?id=409367
Bug ID: 409367
Summary: exit_group() after signal arriving to thread waiting
in futex() causes hangs
Product: valgrind
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: de...@desrt.ca
Target Milestone: ---
Created attachment 121256
--> https://bugs.kde.org/attachment.cgi?id=121256&action=edit
small reproducer
If the main thread of a traced program calls exit_group() very soon after a
signal is delivered to another thread in the program which happens to be
waiting on a futex() then valgrind will start consuming 100% CPU and not exit.
Expected: valgrind should exit.
I suspect this has something to do with signals interacting with the futex call
wrapping because if I replace the futex wait with a normal sleep then
everything works properly.
Also: if the process waits around a while before it exits, there is also no
problem. In order for the problem to occur the program needs to exit quickly.
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