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

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Message-ID: <20121101093723.GC6584@quack.suse.cz>
Date:	Thu, 1 Nov 2012 10:37:23 +0100
From:	Jan Kara <jack@...e.cz>
To:	Nikola Ciprich <nikola.ciprich@...uxbox.cz>
Cc:	Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: BUG: enabling psacct breaks fsfreeze

On Wed 31-10-12 13:46:00, Nikola Ciprich wrote:
> 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..
  Ah, right. Now I looked into the right code and I can see what's the
problem. I'll see what we could do about that... So far I don't have a
better idea than just dropping accounting records that should be written to
frozen filesystem (as you have nowhere to write those records to).

								Honza

> > > 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
> > 
> 
> -- 
> -------------------------------------
> Ing. Nikola CIPRICH
> LinuxBox.cz, s.r.o.
> 28.rijna 168, 709 00 Ostrava
> 
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> -------------------------------------


-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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