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Date: Fri, 22 Feb 2008 00:34:17 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Paul Martin <pm@debian.org>
Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
       Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Subject: Re: 2.6.25-rc2 Thinkpad T30 docking fails with oops.
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On Tue, 19 Feb 2008 20:47:08 +0000 Paul Martin <pm@debian.org> wrote:

> Now, this was working in 2.6.23, but is not in any later kernel. Previously
> reported, but I guess that the previous report was ignored due to the kernel
> being tainted.

Not really.  A lot of acpi-related bug reports get the crickets-chirping
treatment.

The usual response with acpi is "please raise a bugzilla report", and the
acpi developers do respond well to bugzilla reports.  But really, a recent
and oops-causing regression shouldn't require such actions - developers
should be running around with their hair on fire.

> Well, there's nothing other than pure Linus here.
> 
> When booted up docked, there is no oops until you try to undock.
> 
> Whilst I will be looking for replies in the list, I'd appreciate being CC'd
> on any replies.
> 
> ACPI: \_SB_.PCI0.PCI1.DOCK - docking
> PCI: Transparent bridge - 0000:02:03.0
> ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PCI1.DOCK._PRT]
> BUG: unable to handle kernel NULL pointer dereference at 00000000
> IP: [<c01dd6f2>] pdev_sort_resources+0x8a/0x116
> *pde = 00000000 
> Oops: 0000 [#1] PREEMPT SMP 
> Modules linked in: radeon drm rfcomm l2cap bluetooth ppdev lp ipv6 ext3 jbd mbcache fuse dm_crypt crypto_blkcipher dm_mod cpufreq_stats speedstep_ich speedstep_lib thinkpad_acpi nvram acpiphp bay dock pcmcia firmware_class joydev yenta_socket rsrc_nonstatic pcmcia_core battery irtty_sir ac sir_dev snd_intel8x0 snd_ac97_codec nsc_ircc ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer irda parport_pc i2c_i801 button shpchp pci_hotplug crc_ccitt parport snd psmouse intel_agp agpgart iTCO_wdt evdev serio_raw soundcore snd_page_alloc rtc pcspkr xfs floppy e100 mii uhci_hcd usbcore sg sr_mod cdrom sd_mod thermal processor fan ata_piix libata scsi_mod radeonfb fb_ddc i2c_algo_bit i2c_core
> 
> Pid: 39, comm: kacpi_notify Not tainted (2.6.25-rc2 #1)
> EIP: 0060:[<c01dd6f2>] EFLAGS: 00010246 CPU: 0
> EIP is at pdev_sort_resources+0x8a/0x116
> EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000fff
> ESI: f5e30cc4 EDI: f74f1e80 EBP: f74f1e68 ESP: f74f1e48
>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> Process kacpi_notify (pid: 39, ti=f74f0000 task=f74cf120 task.ti=f74f0000)
> Stack: 00000000 f5e30cf0 f74f1e80 f5e30c00 00000007 f5e30c00 f74cb414 f74cb400 
>        f74f1e9c c02a9cce f5e30c08 f7431f90 f7431978 f5420c00 00000000 f7d6d408 
>        f7d6d3c0 f74f1e9c 00000000 f7d6d3c8 f7d6d3c0 f74f1ed8 f9b278ca f74cb40c 
> Call Trace:
>  [<c02a9cce>] ? pci_bus_assign_resources+0x59/0x341
>  [<f9b278ca>] ? acpiphp_enable_slot+0x2a1/0x3a3 [acpiphp]
>  [<f9b27ad9>] ? handle_hotplug_event_func+0x63/0x101 [acpiphp]
>  [<f9b27167>] ? post_dock_fixups+0x6c/0x79 [acpiphp]
>  [<c013506e>] ? notifier_call_chain+0x2b/0x4a
>  [<f9b27a76>] ? handle_hotplug_event_func+0x0/0x101 [acpiphp]
>  [<f9b22168>] ? hotplug_dock_devices+0x39/0xe1 [dock]
>  [<f9b22441>] ? dock_notify+0x75/0xc0 [dock]
>  [<c01f83c9>] ? acpi_ev_notify_dispatch+0x4f/0x5a
>  [<c01f32c0>] ? acpi_os_execute_deferred+0x20/0x2c
>  [<c012ef41>] ? run_workqueue+0x78/0xfb
>  [<c01f32a0>] ? acpi_os_execute_deferred+0x0/0x2c
>  [<c012f79d>] ? worker_thread+0xb6/0xc2
>  [<c0131b25>] ? autoremove_wake_function+0x0/0x30
>  [<c012f6e7>] ? worker_thread+0x0/0xc2
>  [<c0131a52>] ? kthread+0x3b/0x61
>  [<c0131a17>] ? kthread+0x0/0x61
>  [<c010568f>] ? kernel_thread_helper+0x7/0x10
>  =======================
> Code: 50 52 51 ff 75 f0 68 a0 af 34 c0 e8 ce 4e f4 ff 83 c4 1c e9 87 00 00 00 8b 7d e8 8d 42 01 83 7d f0 06 89 7d e0 0f 4e c8 8b 45 e0 <8b> 18 31 c0 85 db 74 29 8b 53 04 8b 43 08 89 d7 05 8c 01 00 00 
> EIP: [<c01dd6f2>] pdev_sort_resources+0x8a/0x116 SS:ESP 0068:f74f1e48
> ---[ end trace 623ea8d57da4defe ]---

I suppose that if you're feeling keen, a bisection search as per
http://www.kernel.org/doc/local/git-quick.html would help things along,
thanks.

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