linux-kernel - Re: 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd related? dm-related?

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Message-ID: <20080306161459.GB3702@atrey.karlin.mff.cuni.cz>
Date:	Thu, 6 Mar 2008 17:14:59 +0100
From:	Jan Kara <jack@...e.cz>
To:	Nix <nix@...eri.org.uk>
Cc:	Peter Osterlund <petero2@...ia.com>, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com
Subject: Re: 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd related? dm-related?

> On 24 Feb 2008, Peter Osterlund told this:
> 
> > Nix <nix@...eri.org.uk> writes:
> >> But while I'd normally blame pktcdvd there's only one pktcdvd function
> >> in these tracebacks (pkt_open) and it's not got a significant stack
> >> footprint.
> >
> > Did you verify that with "make checkstack" or just by looking at the
> > source code? On my system, pkt_open() consumes 584 bytes because the
> > compiler decides to inline lots of functions that would not normally
> > be part of long call chains. The following patch fixes that problem on
> > my system.
> 
> I just looked at the source; I forgot `make checkstack' existed.
> 
> On this system:
> 
> 0xc0263e0f pkt_open [vmlinux]:                          556
> 
> which is nearly as bad.
> 
> (As an aside, I'm surprised I didn't oops when packet-writing as well:
> 
> 0xc021270d udf_process_sequence [vmlinux]:              692
> 0xc020f43d udf_add_entry [vmlinux]:                     628
> 
> owch. I guess that's called via a shorter call chain...)
> 
> 
> I'll try the patch after this series of backups is done :)
  If you are interested, linux-next or -mm tree should contain a patch now
that fixes the problem...

								Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs
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