Re: Processes hang in an unkillable state

[AmÃrico Wang]

2011/4/12 Robert ÅwiÄcki <robert@xxxxxxxxxxx>:
> 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) Â Â = 6
> read(6, Â- Â Â Â Â Â Â 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...
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/