From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: kernel panic in slab.c From: Hubert Figuiere To: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.linuxppc.org In-Reply-To: <1064497450.702.12.camel@gaston> References: <1064493093.17039.44.camel@trantor.staff.proxad.net> <1064497450.702.12.camel@gaston> Content-Type: text/plain; charset=iso-8859-15 Message-Id: <1064499264.17038.70.camel@trantor.staff.proxad.net> Mime-Version: 1.0 Date: Thu, 25 Sep 2003 16:14:24 +0200 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Hi, On Thu, 2003-09-25 at 15:44, Benjamin Herrenschmidt wrote: > Nice to see you using Linux again :) I never stopped :-) > > What machine is this ? Custom network hardware with a PrPMC750 Motorola board as MPU. We have a few tiny patches for our custom devices, but nothing important here IMHO. > The bug shows that the poison checker found that a freed block got > overriden. It didn't display more infos about the kind of pattern > it found and/or a backtrace ? That would be helpful. I might investigate. > I've been trying to track down such kind of memory corruption for > some time now, so if you have a good handle on it, I'm interested, > as I suspect something wrong is going on in recent 2.4s Fine, then I feel like investigating it since memory corruption are probably the worst bugs. I don't have a good handle on the problem. I often crash while running either "bird" or "swapper" (uptime don't exceed 5 or 10 minutes). Even worse, sometime it crashes during boot up. The only thing I'm sure is that it is fully reproducible as it plagged me for quite sometime. I first thaught that hardware was at fault (like defective MPU), but my co-workers don't have the problem, and in fact disabled debugging. Thanks Hub -- Hubert Figuière - Freebox SA. - +33 1 73 50 2 563 AIM/Yahoo!: hfiguiere, ICQ: 307453487 ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/