linux-kernel - Re: [bug] SLOB crash, 2.6.24-rc2

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Date:	Thu, 15 Nov 2007 11:43:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	mpm@...enic.com, rjw@...k.pl, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org
Subject: Re: [bug] SLOB crash, 2.6.24-rc2

* David Miller <davem@...emloft.net> wrote:

> From: Matt Mackall <mpm@...enic.com>
> Date: Wed, 14 Nov 2007 17:37:13 -0600
> 
> > No, the usual strategy for debugging problems -outside- SLOB is to
> > switch to another allocator with more extensive debugging facilities.
> 
> Ok, so the thing we still can do is do a dump_stack() at the list 
> debugging assertion trigger points.

ok, i'll first try to trigger it again.

it's a bzImage kernel with fixed order of eth0 and eth1 detection. What 
i did was to twiddle the /etc/sysconfig/network-scripts/ifcfg-eth* 
configs to address a network-does-not-show-up bug that .24 introduced. 
The crash logs contain this:

 VFS: Mounted root (ext3 filesystem) readonly.
 Freeing unused kernel memory: 396k freed
 Write protecting the kernel read-only data: 2056k
 udev: renamed network interface eth1 to eth0
 udev: renamed network interface eth0_rename to eth1
 eth0: link down
 ADDRCONF(NETDEV_UP): eth0: link is not ready
 EXT3 FS on sda6, internal journal
 kjournald starting.  Commit interval 5 seconds

followed by the crash shortly afterwards (but not immediately). With the 
non-crashing kernel i dont get those "renamed network interface" 
messages.

network interface renaming has been a historic source of pain for me so 
i frequently have to 'twiddle' the networking config to make it work 
again on new kernels. Perhaps because i'm using bzImage kernels. 
User-space is Fedora 8, so fairly recent.

	Ingo
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