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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <BANLkTimJLcfsYAhV+3=-F14YZvX12-yXgA@mail.gmail.com>
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...
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/