linux-kernel - Re: BUG: enabling psacct breaks fsfreeze

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Message-ID: <20121031124600.GM20752@pcnci.linuxbox.cz>
Date:	Wed, 31 Oct 2012 13:46:00 +0100
From:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Subject: Re: BUG: enabling psacct breaks fsfreeze

Hi Jan,

thanks for the reply, sure, I'll gather and post requested info.
One more note before that, the problem is with psacct, not audit
 - psacct if I'm not mistaken  (and as opposed to audit) doesn't
use any userspace, kernel dumps information directly to fs, 
which might the reason for deadlock..

BR

nik


> > Should more debugging information be needed, I'll be glad to provide whatever I can..
>   Thanks for report. Hum, I'm not sure how the deadlock can happen because
> AFAIU audit sends a message via netlink to userspace and whatever audit
> daemon does with it is its private thing. Can you please run:
>   echo w >/proc/sysrq-trigger
> after the machine deadlocks and then take dmesg and attach it here? You'll
> have to have the shell prepared and use serial console / netconsole to gather
> dmesg or try your luck with copying via ssh / netcat.
> 
> 								Honza
> -- 
> Jan Kara <jack@...e.cz>
> SUSE Labs, CR
> 

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