| Date | Tue, 10 Dec 2013 22:34:31 +0100 | From | Oleg Nesterov <> | Subject | Re: process 'stuck' at exit. |
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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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