Re: Kernel BUG unable to handle kernel NULL pointer dereference

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On Mon, Oct 24, 2011 at 1:10 PM, Leonidas Spyropoulos
<artafinde@xxxxxxxxx> wrote:
> On Mon, Oct 24, 2011 at 12:51 PM, David Sterba <dsterba@xxxxxxx> wrote:
>> On Mon, Oct 24, 2011 at 12:33:05PM +0100, Leonidas Spyropoulos wrote:
>>> Here is it, it's big and contains usless information..
>>>
>>> http://paste.pocoo.org/show/497299/
>>
>> not all that useless ... I saw another BUG earlier than the one you've
>> reported:
>>
>> [31653.267742] ------------[ cut here ]------------
>> [31653.267764] kernel BUG at fs/btrfs/extent-tree.c:5510!
>> [31653.267773] invalid opcode: 0000 [#1] PREEMPT SMP
>> [31653.267785] CPU 1
>> [31653.267790] Modules linked in: vboxdrv ipv6 loop fuse adt7475 hwmon_vid nouveau evdev uvcvideo hid_apple ttm videodev drm_kms_helper media v4l2_compat_ioctl32 drm snd_emu10k1 i2c_algo_bit mxm_wmi wmi pcspkr snd_rawmidi snd_seq_device firewire_ohci emu10k1_gp edac_core psmouse snd_util_mem edac_mce_amd k8temp firewire_core gameport snd_hwdep video serio_raw crc_itu_t sg snd_intel8x0 snd_ac97_codec usbhid ac97_bus snd_pcm snd_timer hid snd floppy i2c_nforce2 thermal processor fan button soundcore i2c_core snd_page_alloc forcedeth btrfs zlib_deflate crc32c libcrc32c ext4 jbd2 crc16 ext3 jbd mbcache ohci_hcd ehci_hcd usbcore sr_mod sd_mod cdrom sata_nv pata_amd libata scsi_mod
>> [31653.267989]
>> [31653.267995] Pid: 726, comm: btrfs-transacti Not tainted 3.0-ARCH #1    /LP UT NF4 Expert
>> [31653.268011] RIP: 0010:[<ffffffffa01a6263>]  [<ffffffffa01a6263>] run_clustered_refs+0x813/0x830 [btrfs]
>> [31653.268045] RSP: 0018:ffff88013469bc70  EFLAGS: 00010286
>> [31653.268286] RAX: 00000000ffffffe4 RBX: ffff88012e406900 RCX: ffff8801378a6100
>> [31653.268296] RDX: ffff88011513a0f0 RSI: 0000000000000000 RDI: 0000000000000000
>> [31653.268306] RBP: ffff88013469bd50 R08: ffffffffffffffff R09: 0000000000000000
>> [31653.268315] R10: ffff8801346f9800 R11: ffff88013735d3f0 R12: ffff8800a9bc7f00
>> [31653.268325] R13: ffff88007b1d7e40 R14: ffff88011bd1e4b0 R15: 0000000000000000
>> [31653.268341] FS:  00007f8dcc527880(0000) GS:ffff88013fd00000(0000) knlGS:00000000f67567f0
>> [31653.268367] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
>> [31653.268380] CR2: 00007f9059631550 CR3: 00000000a499c000 CR4: 00000000000006e0
>> [31653.268394] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> [31653.268409] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> [31653.268424] Process btrfs-transacti (pid: 726, threadinfo ffff88013469a000, task ffff880136c140b0)
>> [31653.268443] Stack:
>> [31653.268449]  0000000000000000 0000000000000000 ffff880100000001 0000000000000000
>> [31653.268473]  0000000000000c2e 00000000a01dc529 0000000000000000 0000000000000002
>> [31653.268495]  0000000000000b9f 0000000000000c04 0000000000000000 ffff88013469bd90
>> [31653.268515] Call Trace:
>> [31653.268531]  [<ffffffffa01a6348>] btrfs_run_delayed_refs+0xc8/0x220 [btrfs]
>> [31653.268549]  [<ffffffffa019421a>] ? btrfs_free_path+0x2a/0x40 [btrfs]
>> [31653.268568]  [<ffffffffa01b86c3>] btrfs_commit_transaction+0x3c3/0x8a0 [btrfs]
>> [31653.268581]  [<ffffffff8107f790>] ? abort_exclusive_wait+0xb0/0xb0
>> [31653.268598]  [<ffffffffa01b13ed>] transaction_kthread+0x26d/0x290 [btrfs]
>> [31653.268617]  [<ffffffffa01b1180>] ? btrfs_congested_fn+0xd0/0xd0 [btrfs]
>> [31653.268627]  [<ffffffff8107ee3c>] kthread+0x8c/0xa0
>> [31653.268638]  [<ffffffff813f5d64>] kernel_thread_helper+0x4/0x10
>> [31653.268647]  [<ffffffff8107edb0>] ? kthread_worker_fn+0x190/0x190
>> [31653.268657]  [<ffffffff813f5d60>] ? gs_change+0x13/0x13
>> [31653.268673] Code: e0 e9 12 f9 ff ff 0f 0b 80 fa b2 0f 84 bc f9 ff ff 0f 0b be 95 00 00 00 48 c7 c7 37 d0 20 a0 e8 54 65 eb e0 e9 04 f9 ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 66 66 66 66 66 66 2e
>> [31653.268928] RIP  [<ffffffffa01a6263>] run_clustered_refs+0x813/0x830 [btrfs]
>> [31653.268956]  RSP <ffff88013469bc70>
>> [31653.284196] ---[ end trace d5d8ee7634d1c36e ]---
>>
>> and it looks related to the print_leaf bug later (eg. mentiones same functions
>> in the stacktrace and happens during commit).
>>
>> And judging from the rest of BUG's in the paste, the filesystem is in a bad
>> shape. Some BUG_ON's seem to be triggered by ENOSPC (RAX containing 0xfff..e4).
>>
>>
>> david
>>
>
> I am doing a backup of my current data as I write this mail (hopefully
> it will finish without IO errors).
> Will it help if I print the btrfs tree and post it somewhere?
>
> I mean, since the system is funcionable, it could be useful to track
> down the bug, no?
>
> Regards
> Leonidas
>
>
>
> --
> Caution: breathing may be hazardous to your health.
>

Update:
I umount the /home partition and rin the btrfsck tool on the device
The output is: http://paste.pocoo.org/show/498415/

Using btrfs-tools from darksatanic git repo branch integration-20111012

I think I will be going for recreation of the partition.
Hopefully my / is ok. Need to do the check with a LiveCD.

-- 
Caution: breathing may be hazardous to your health.
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