linux-kernel - Re: 2.6.22-rc6 spurious hangs

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Message-ID: <20070628181044.GA613@tv-sign.ru>
Date:	Thu, 28 Jun 2007 22:10:44 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Thomas Sattler <tsattler@....de>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: 2.6.22-rc6 spurious hangs

On 06/28, Thomas Sattler wrote:
>
> Here is the logfile.

> Jun 28 18:26:03 pearl ERR!! events/0 flush hang: f573759c f573759c 5782 5782 0 1
> Jun 28 18:26:03 pearl CURR: 5557 5557 dvbd 0 129024
> Jun 28 18:26:03 pearl wq_barrier_func+0x0/0xd
> Jun 28 18:26:03 pearl cache_reap+0x0/0xe3
> Jun 28 18:26:03 pearl ----
> Jun 28 18:26:03 pearl cinergyt2_query_rc+0x0/0x2e9 [cinergyT2]
> ...
> Jun 28 19:23:03 pearl ERR!! events/0 flush hang: f573759c f573759c 5782 5782 1 1
> Jun 28 19:23:03 pearl CURR: 5557 5557 dvbd 0 129138
> Jun 28 19:23:03 pearl wq_barrier_func+0x0/0xd
> Jun 28 19:23:03 pearl cache_reap+0x0/0xe3
> Jun 28 19:23:03 pearl console_callback+0x0/0xca
> Jun 28 19:23:03 pearl flush_to_ldisc+0x0/0xf7
> Jun 28 19:23:03 pearl rekey_seq_generator+0x0/0x4e
> Jun 28 19:23:03 pearl ----
> Jun 28 19:23:03 pearl cinergyt2_query_rc+0x0/0x2e9 [cinergyT2]

cinergyt2_query_rc() hangs. I'll try to look tomorrov, but I know nothing
about drivers/media/dvb/.

This log is strange, flush_work() should report every 30 seconds, but it
looks like wait_for_completion_timeout(HZ * 30) returns a lot earlier.

Could you also show the result of sysrq-T ?

Thanks!

Oleg.

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