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Date: Mon, 14 Aug 2006 16:56:38 -0400
From: Dave Jones <davej@redhat.com>
To: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: john stultz <johnstul@us.ibm.com>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
       Ingo Molnar <mingo@elte.hu>, Dinakar Guniguntala <dino@in.ibm.com>
Subject: Re: 2.6.18-rc4-mm1
Message-ID: <20060814205637.GA30814@redhat.com>
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	Michal Piotrowski <michal.k.k.piotrowski@gmail.com>,
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	linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@elte.hu>, Dinakar Guniguntala <dino@in.ibm.com>
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On Mon, Aug 14, 2006 at 10:48:58PM +0200, Michal Piotrowski wrote:
 > 
 > Hmmm... It looks a bit different without futex_handle_fault-always-fails.patch
 > 
 > Aug 14 22:30:09 ltg01-fedora kernel: general protection fault: 0000 [#1]
 > Aug 14 22:30:09 ltg01-fedora kernel: 4K_STACKS PREEMPT SMP
 > Aug 14 22:30:09 ltg01-fedora kernel: last sysfs file: /devices/platform/i2c-9191/9191-0290/temp2_input
 > Aug 14 22:30:09 ltg01-fedora kernel: Modules linked in: ipv6 w83627hf hwmon_vid hwmon i2c_isa af_packet ip_conntrack_netbios
 > _ns ipt_REJECT xt_state ip_conntrack nfnetlink xt_tcpudp iptable_filter ip_tables x_tables cpufreq_userspace p4_clockmod spe
 > edstep_lib binfmt_misc thermal processor fan container evdev snd_intel8x0 snd_ac97_codec snd_ac97_bus snd_seq_dummy snd_seq_
 > oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm sk98lin skge snd_timer snd soundcore snd_pag
 > e_alloc ide_cd i2c_i801 intel_agp agpgart cdrom rtc unix
 > Aug 14 22:30:09 ltg01-fedora kernel: CPU:    0
 > Aug 14 22:30:09 ltg01-fedora kernel: EIP:    0060:[<c0205249>]    Not tainted VLI
 > Aug 14 22:30:09 ltg01-fedora kernel: EFLAGS: 00010246   (2.6.18-rc4-mm1 #101)
 > Aug 14 22:30:09 ltg01-fedora kernel: EIP is at __list_add+0x3d/0x7a

 ...

 > 0xc0205249 is in __list_add (/usr/src/linux-mm/lib/list_debug.c:28).
 > 23              if (unlikely(next->prev != prev)) {
 > 24                      printk("list_add corruption. next->prev should be %p, but was %p\n",
 > 25                              prev, next->prev);
 > 26                      BUG();
 > 27              }
 > 28              if (unlikely(prev->next != next)) {
 > 29                      printk("list_add corruption. prev->next should be %p, but was %p\n",
 > 30                              next, prev->next);
 > 31                      BUG();
 > 32              }
 > 
 > I'll revert debug-variants-of-linked-list-macros.patch

__list_add will still be dereferencing prev->next, so you should see exactly
the same gpf. Note that you're not triggering the BUG()'s here, you're hitting
some other fault just walking the list.

		Dave

-- 
http://www.codemonkey.org.uk
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