hung_task: fix false positive during vfork
authorMandeep Singh Baines <msb@chromium.org>
Tue, 3 Jan 2012 22:41:13 +0000 (14:41 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 4 Jan 2012 00:14:32 +0000 (16:14 -0800)
commitf9fab10bbd768b0e5254e53a4a8477a94bfc4b96
tree7f4efb5c46582765c12249f652a8975a1956f781
parent30e053248da178cf6154bb7e950dc8713567e3fa
hung_task: fix false positive during vfork

vfork parent uninterruptibly and unkillably waits for its child to
exec/exit. This wait is of unbounded length. Ignore such waits
in the hung_task detector.

Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
Reported-by: Sasha Levin <levinsasha928@gmail.com>
LKML-Reference: <1325344394.28904.43.camel@lappy>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/hung_task.c