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From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
To: "Dave Airlie" <airlied@gmail.com>
Subject: Re: next-2008120[3,4] drm oops (was Re: vanilla kernels hang randomly under Fedora 10 on system with Radeon card)
Date: Wed, 10 Dec 2008 00:09:24 +0100
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Cc: linux-kernel@vger.kernel.org, "Benny Amorsen" <benny+usenet@amorsen.dk>,
       linux-next@vger.kernel.org
References: <200812012342.32575.bzolnier@gmail.com> <200812051950.28443.bzolnier@gmail.com> <21d7e9970812071617u72d5f6d9k1bbde5a09ed9412f@mail.gmail.com>
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On Monday 08 December 2008, Dave Airlie wrote:
> On Sat, Dec 6, 2008 at 4:50 AM, Bartlomiej Zolnierkiewicz
> <bzolnier@gmail.com> wrote:
> > On Thursday 04 December 2008, Bartlomiej Zolnierkiewicz wrote:
> >
> > [...]
> >
> >> To add more fun I'm getting following DRM oops with next-2008120[3,4]:
> >
> > Here is refreshed oops (I needed to tweak/rebuild the kernel):
> >
> > BUG: unable to handle kernel NULL pointer dereference at 00000144
> > IP: [<c0247371>] drm_addmap_core+0x548/0x561
> > *pde = 00000000
> > Oops: 0000 [#1] PREEMPT SMP
> > last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/enable
> > Modules linked in: radeon(+) lib80211_crypt_tkip xt_state ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 acerhk cpufreq_ondemand binfmt_misc snd_intel8x0 snd_intel8x0m snd_ac97_codec snd_seq_dummy ac97_bus snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm ipw2200 snd_timer libipw snd soundcore snd_page_alloc lib80211 ehci_hcd uhci_hcd parport_pc parport
> >
> > Pid: 1740, comm: modprobe Not tainted (2.6.28-rc7-next-20081204 #268) Extensa 2900
> > EIP: 0060:[<c0247371>] EFLAGS: 00213202 CPU: 0
> > EIP is at drm_addmap_core+0x548/0x561
> > EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: da1dec00
> > ESI: da2baac0 EDI: da177a80 EBP: e0010000 ESP: da2c1ea4
> >  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> > Process modprobe (pid: 1740, ti=da2c1000 task=df8741b0 task.ti=da2c1000)
> > Stack:
> >  da177a80 00010000 da1dec00 00000002 da1dec20 da177a88 da1decd4 da1decd4
> >  da1dece0 00010000 da2c1eec da285800 da285b44 da1dec00 c02473f2 00000001
> >  00000082 da2c1eec da2c1ef4 00010000 e085674c 00000001 00000082 da285b40
> > Call Trace:
> >  [<c02473f2>] drm_addmap+0x14/0x2e
> >  [<e085674c>] radeon_driver_load+0xef/0x15a [radeon]
> >  [<c024bb73>] drm_get_dev+0x240/0x4ab
> >  [<c01e48af>] kobject_get+0xf/0x13
> >  [<c024821d>] drm_init+0x5a/0x89
> >  [<e0832000>] radeon_init+0x0/0x14 [radeon]
> >  [<c010112c>] _stext+0x44/0x108
> >  [<c01430a8>] sys_init_module+0x87/0x174
> >  [<c0102eb1>] sysenter_do_call+0x12/0x25
> >  [<c0310000>] rtl8139_init_one+0x685/0x85e
> > Code: 12 0d 00 eb 35 8b 3c 24 8b 47 10 c7 47 1c 00 00 00 00 c1 e0 0c 89 47 18 8b 44 24 10 e8 a8 12 0d 00 8b 54 24 08 8b 82 b0 02 00 00 <8b> 80 44 01 00 00 89 47 20 8b 4c 24 44 89 39 83 c4 28 89 d8 5b
> > EIP: [<c0247371>] drm_addmap_core+0x548/0x561 SS:ESP 0068:da2c1ea4
> > ---[ end trace b2c7f2a062698806 ]---
> >
> > [...]
> >
> >> which I think may be caused by:
> >>
> >> commit c2f29f764c0daa0084674d4a463e7158ac5c4dc4
> >> Author: Dave Airlie <airlied@redhat.com>
> >> Date:   Fri Nov 28 14:22:24 2008 +1000
> >>
> >>     drm: move to kref per-master structures.
> >>
> >> however I haven't verified it yet.
> 
> 
> Thanks for that, I've pushed the fix into drm-next
> (d5de2d1a3a88628396c895410ae9e06f732d6591)
> which was to reorganise the startup sequence so things happened in a
> more correct order.
> 
> Let me know if it still breaks.

I've just tested next-20081209 and it is all good now.  Thanks!
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