netdev - Re: 2.6.24-rc5-mm1 -- inconsistent {in-softirq-W} -> {softirq-on-R} usage.

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Date:	Sat, 15 Dec 2007 19:42:11 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Miles Lane <miles.lane@...il.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: 2.6.24-rc5-mm1 -- inconsistent {in-softirq-W} -> {softirq-on-R}
   usage.

Andrew Morton wrote, On 12/15/2007 12:13 PM:

> On Fri, 14 Dec 2007 22:58:24 -0500 "Miles Lane" <miles.lane@...il.com> wrote:



...

>> I applied the patch and then tried my test again.  This time my system
>> locked up.
>> Perhaps I should open a new thread for this, since the problem looks
>> pretty different.
>>
>> Dec 14 21:32:55 feargod kernel: process `cat' is using deprecated
>> sysctl (syscall) net.ipv6.neigh.default.retrans_time; Use
>> net.ipv6.neigh.default.retran
>> s_time_ms instead.
>> Dec 14 21:32:55 feargod kernel:
>> Dec 14 21:32:55 feargod kernel: =====================================
>> Dec 14 21:32:55 feargod kernel: [ BUG: bad unlock balance detected! ]
>> Dec 14 21:32:55 feargod kernel: -------------------------------------
>> Dec 14 21:32:55 feargod kernel: cat/6180 is trying to release lock
>> (kkkkkkk�����H3��) at:
>> Dec 14 21:32:55 feargod kernel: [packet_seq_stop+0xe/0x10]
>> packet_seq_stop+0xe/0x10
>> Dec 14 21:32:55 feargod kernel: but there are no more locks to release!
>> Dec 14 21:32:55 feargod kernel:
>> Dec 14 21:32:55 feargod kernel: other info that might help us debug this:
>> Dec 14 21:32:55 feargod kernel: 2 locks held by cat/6180:
>> Dec 14 21:32:55 feargod kernel:  #0:  (&p->lock){--..}, at:
>> [crypto_algapi:seq_read+0x25/0x191c1] seq_read+0x25/0x26f
>> Dec 14 21:32:55 feargod kernel:  #1:
>> (&net->packet.sklist_lock){-.--}, at: [packet_seq_start+0x14/0x4d]
>> packet_seq_start+0x14/0x4d



Miles, I didn't check this yet, but since there were some considerable
changes, including locking, you could try with reverting some of these
last 3 patches to net/packet by Denis:

http://git.kernel.org/?p=linux/kernel/git/davem/net-2.6.25.git;a=history;f=net/packet/af_packet.c;h=485af5691d64270a02322925a6ccfad9d02b7f78;hb=HEAD

Regards,
Jarek P.

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