linux-kernel - Re: Processes hang in an unkillable state

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Date:	Tue, 12 Apr 2011 20:44:35 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Robert Święcki <robert@...ecki.net>
Cc:	linux-kernel@...r.kernel.org, oleg@...hat.com
Subject: Re: Processes hang in an unkillable state

2011/4/12 Robert Święcki <robert@...ecki.net>:
> Hi, while fuzzing Linux system calls (32bit fuzzer, 64bi linux
> kernel), it happens after some time (10-20mins) that some processes
> enter a state which makes them un-killable. They are either in R or D
> state.
>
> # strace ps wwuax
> ...
> ...
> open("/proc/450/cmdline", O_RDONLY)     = 6
> read(6,  -             hangs....
>
> # kill -9 450
> # kill -9 450 (no ESRCH)
>
> More data in the attachment - I'll keep it in the kdb session for
> further examination.

Hmm, it must be stuck at

lib/rwsem.c

        /* wait to be given the lock */
        for (;;) {
                if (!waiter.task)
                        break;
                schedule();
                set_task_state(tsk, TASK_UNINTERRUPTIBLE);
        }

don't know why it still can't acquire the ->mmap_sem...

Cc'ing Oleg...
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