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SubjectRe: process 'stuck' at exit.
On 12/10, Dave Jones wrote:
>
> On Tue, Dec 10, 2013 at 09:35:59PM +0100, Oleg Nesterov wrote:
> >
> > I am looking at the first message and I can't understand who stuck
> > "at exit".
> >
> > The trace shows that the task with pid=10818 called sys_futex() ?
> >
> > Perhaps "exit" means the userspace paths?
>
> pid 1131 is wait()'ing for 10818 to exit
>
> pid 1130 is periodically sending SIGKILL to 10818 because it's gotten
> tired of waiting. 10818 is ignoring these because it's stuck in a loop
> somewhere in the kernel.

OK, thanks. So it doesn't return to user-space.

could you do

cd /sys/kernel/debug/tracing/
echo 10818 >> set_ftrace_pid
echo function_graph >> current_tracer
echo 1 >> tracing_on

and look into "trace" file to find out how exactly it loops?

> I tried attaching to 10818 with gdb, and it just hangs.

This is clear, 10818 obviously can't stop.

Oleg.



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