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hung task debugging: Inject NMI when hung and going to panic

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Send an NMI to all CPUs when a hung task is detected and the hung
task code is configured to panic. This gives us a fairly uptodate
snapshot of all CPUs in the system.

This lets us get stack trace of all CPUs which makes life easier
trying to debug a deadlock, and the NMI doesn't change anything
since the next step is a kernel panic.

Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1331848040-1676-1-git-send-email-levinsasha928@gmail.com
[ extended the changelog a bit ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Sasha Levin 2012-03-15 17:47:20 -04:00 committed by Ingo Molnar
parent af3a3ab296
commit 625056b65e
1 changed files with 3 additions and 1 deletions
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4
kernel/hung_task.c
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@ -108,8 +108,10 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
touch_nmi_watchdog();
if (sysctl_hung_task_panic)
if (sysctl_hung_task_panic) {
trigger_all_cpu_backtrace();
panic("hung_task: blocked tasks");
}
}
/*