linux-kernel - Hanging ps output after crash

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Date:	Thu, 22 Aug 2013 16:06:59 -0400
From:	Corey <corey@....co>
To:	linux-kernel@...r.kernel.org
Subject: Hanging ps output after crash

Hello mailing list,

Earlier today I had Eclipse/Tomcat crash and thereafter I was unable
to use ps or other process utilities. Specifically, the output of ps,
top, w, and so on would hang and I was unable to terminate the
process. `ps` (with no arguments) and `pstree` remained working,
however. After some discussion in my distro-specific IRC channel,
someone suggested I should reach out to this mailing list.

I am using Arch Linux on kernel 3.10.7-1-ARCH SMP PREEMPT x86_64

Here is the output of `strace ps aux`: http://pastebin.com/jaFCN3YL
(large text file)

And the output of /proc/<pid>/stack:
[<ffffffff81279a64>] call_rwsem_down_read_failed+0x14/0x30
[<ffffffff8114cdb2>] __access_remote_vm+0x42/0x1c0
[<ffffffff8114d240>] access_process_vm+0x50/0x70
[<ffffffff811f069a>] proc_pid_cmdline+0x8a/0x120
[<ffffffff811ef57f>] proc_info_read+0x8f/0xe0
[<ffffffff8118b148>] vfs_read+0x98/0x170
[<ffffffff8118bc39>] SyS_read+0x49/0xa0
[<ffffffff814cfaef>] tracesys+0xe1/0xe6
[<ffffffffffffffff>] 0xffffffffffffffff

When I tried to reboot, the system crashed. As I had no good way to
collect the contents of the dump, I took a few pictures (the
widescreen necessitated two pictures, though I doubt the latter is of
much use) and hosted them on imgur: http://imgur.com/a/cqfOH.

I hope this information is suitable and that I have not posted here in
error. Please keep in mind that I am not subscribed to this mailing
list.

Thanks,

Corey
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