linux-kernel - Re: [ 286.547348] BUG: unable to handle kernel paging request at 6b6b6b6b

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Date:	Wed, 7 Jan 2009 08:48:22 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"Rusty Russell" <rusty@...tcorp.com.au>
Subject: Re: [ 286.547348] BUG: unable to handle kernel paging request at 6b6b6b6b

Hi Justin,

On Wed, Jan 7, 2009 at 2:12 AM, Justin P. Mattock
<justinmattock@...il.com> wrote:
> With pulling git today I'm unable to shut the machine down completely.
> (the system just sits there with the message on the screen);
>
> * will now halt
> [  286.547348] BUG: unable to handle kernel paging request at 6b6b6b6b

That looks like use-after-free in __stop_machine() so lets cc Rusty.
If you want, you can convert the oops location into human-readable
form. Just search for "GDB" in Documentation/BUG-HUNTING for
instructions how to do that. And don't forget to send your .config.

> [  286.548940] IP: [<c0150ca4>] __stop_machine+0x88/0xe3
> [  286.550598] Oops: 0002 [#1] SMP
> [  286.552206] last sysfs file: /sys/block/sda/removeable
> [  286.553844] Modules linked in: hidp radeon drm agpgart btusb rfcomm bnep
> sco l2cap bluetooth fan battery container ipt_LOG xt_limit xt_tcpudp
> xt_state ipt_addrtype nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat
> nf_conntrack_ftp ipmi_watchdog ipmi_msghandler uvcvideo isight_firmware
> uinput arpt_mangle arptable_filter arp_tables nf_conntrack_ipv4 nf_conntrack
> nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables x_tables coretemp
> eeprom acpi_cpufreq cpufreq_powersave cpufreq_performance cpufreq_ondemand
> cpufreq_conservative appletouch snd_had_codec_idt ohci1394 ehci_hcd
> snd_hda_intel snd_hda_codec thermal ath9k uhci_hcd ieee1394 joydev pata_acpi
> snd_hwdep snd_pcm snd_page_alloc video ac button processor applesmc evdev
> [  286.560580]
> [  286.560580] Pid: 3273, comm: halt Not tainted (2.6.28-06127-g238c6d5 #1)
> MacBookPro2,2
> [  286.560580] EIP: 0060:[<c0150ca4>] EFLAGS: 00010293 CPU: 0
> [  286.560580] EIP: is at __stop_machine+0x88/0xe3
> [  286.560580] EAX: 6b6b6b6b EBX: 00000000 ECX: 6b6b6b6b EDX: 00000000
> [  286.560580] ESI: c054abe0 EDI: c03d03a4 EBP: f1a29e54 ESP: f1a29e44
> [  286.560580]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [  286.560580] Process halt (pid: 3273, ti=f1a28000 task=f4530f30
> task.ti=f1a28000)
> [  286.560580] Stack:
> [  286.560580] f1a29e60 c054abe0 00000001 00000010 f1a29e7c c03d04e4
> ffffffea 00000010
> [  286.560580] 00000001 00000003 00000022 00000001 4321fedc c054abe0
> f1a29e94 c012a57e
> [  286.560580] 00000000 ffffffff 4321fedc 28121969 f1a29e9c c01360c0
> f1a29fb0 c0136301
> [  286.560580] Call Trace:
> [  286.560580]  [<c03d04e4>] ? _cpu_down+0x10f/0x234
> [  286.560580]  [<c012a57e>] ? disable_nonboot_cpus+0x58/0xdc
> [  286.560580]  [<c01360c0>] ? kernel_poweroff+0x22/0x39
> [  286.560580]  [<c0136301>] ? sys_reboot+0xde/0x14c
> [  286.560580]  [<c01331b2>] ? complete_signal+0x179/0x191
> [  286.560580]  [<c0133396>] ? send_signal+0x1cc/0x1e1
> [  286.560580]  [<c03de418>] ? _spin_unlock_irqrestore+0x2d/0x3c
> [  286.560580]  [<c0133b65>] ? group_send_signal_info+0x58/0x61
> [  286.560580]  [<c0133b9e>] ? kill_pid_info+0x30/0x3a
> [  286.560580]  [<c0133d49>] ? sys_kill+0x75/0x13a
> [  286.560580]  [<c01a06cb>] ? mntput_no_expire+ox1f/0x101
> [  286.560580]  [<c019b3b3>] ? dput+0x1e/0x105
> [  286.560580]  [<c018ef87>] ?  __fput+0x150/0x158
> [  286.560580]  [<c0157abf>] ? audit_syscall_entry+0x137/0x159
> [  286.560580]  [<c010329f>] ? sysenter_do_call+0x12/0x34
> [  286.560580] Code: c7 05 10 06 62 c0 00 00 00 00 a3 f4 05 62 c0 c7 05 ec
> 05 62 c0 01 00 00 00 83 cb ff eb 2d a1 1c 06 62 c0 f7 d0 8b 0c 98 8d 41 04
> <c7> 01 00 00 00 00 89 41 04 89 41 08 c7 41 0c ff 0c 15 c0 89 d8
> [  286.560580] EIP: [<c0150ca4>] __stop_machine+0x88/0xe3 SS:ESP
> 0068:f1a29e44
> [  286.639215] ---[ end trace 5b080c1ab14203ae ] ---
> Segmentation fault
>
> after this message appears, if I hold down the start button
> the system shuts off after a few seconds.
> (BTW hopefully the number are correct,
> manually writing this down, is a bit of a pain);
>
> regards;
>
> Justin P. Mattock
>
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