Re: [dave@hiauly1.hia.nrc.ca: Re: [parisc-linux] Why gas kills the

From: Carlos O'Donell <carlos@systemhalted.org>
To: John David Anglin <dave@hiauly1.hia.nrc.ca>
Cc: James Bottomley <James.Bottomley@SteelEye.com>,
	tausq@debian.org, parisc-linux@lists.parisc-linux.org
Subject: Re: [dave@hiauly1.hia.nrc.ca: Re: [parisc-linux] Why gas kills the
Date: Fri, 1 Jul 2005 15:12:55 -0400	[thread overview]
Message-ID: <20050701191254.GX5269@systemhalted.org> (raw)
In-Reply-To: <200507011838.j61Ic37N006115@hiauly1.hia.nrc.ca>

On Fri, Jul 01, 2005 at 02:38:03PM -0400, John David Anglin wrote:
> > On Fri, 2005-07-01 at 13:53 -0400, Carlos O'Donell wrote:
> > > journal_alloc_journal_head() can return a null pointer causing
> > > the kernel to die in memset.  I think the fix is to skip calling
> > > memset when new_jh is null.  The rest of the code looks ok except
> > > for possibly
> > 
> > That's true (and needs fixing), but isn't what happened in this case.
> > Look at the traceback:
> 
> Actually, I was wrong.  journal_alloc_journal_head con't return
> null.  I see it spins until kmem_cache_alloc returns a non null
> value.
> 
> It looks like mm/slab.c needs to be built with DEBUG true and
> and possibly CONFIG_DEBUG_PAGEALLOC to find how the pointer is
> getting allocated.

I don't know how to turn that on, I can see the define in a couple of
places, but it's not really connected to any configuration option.
It looks bitrotten.

c.

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