Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH] hung task: NMI when hung and going to panic | Date | Thu, 15 Mar 2012 17:47:20 -0400 |
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NMI all CPUs when detected a hung task and the hung task code is configured to panic.
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> --- kernel/hung_task.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/kernel/hung_task.c b/kernel/hung_task.c index c21449f..6df6149 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -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"); + } } /* -- 1.7.8.4
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