linux-ext4 - Re: kernel BUG at fs/ext4/move

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Date:	Mon, 21 Sep 2009 09:22:35 +0800
From:	Peng Tao <bergwolf@...il.com>
To:	SandeepKsinha <sandeepksinha@...il.com>
Cc:	ext4 <linux-ext4@...r.kernel.org>
Subject: Re: kernel BUG at fs/ext4/move_extent.c:1317!

Hi, Sandeep,

On Sun, Sep 20, 2009 at 9:25 PM, SandeepKsinha <sandeepksinha@...il.com> wrote:
> Hi Akira/others,
>
> I hit the following assert kernel BUG at fs/ext4/move_extent.c:1317!
>
> The file I was playing around with was a simple holey file created like:
>
> [/mnt]
> [18:35:13 sinhas]$ dd if=/dev/zero of=/mnt/ext4image seek=1000 count=5
> 5+0 records in
> 5+0 records out
> 2560 bytes (2.6 kB) copied, 0.000146457 s, 17.5 MB/s
>
> I am using v2.6.31. I have seen some patchsets a couple of days from
> you. Does any of them address any similar problem.?
Yes. The BUG_ON is unnecessary and is removed in the latest mainline
kernel. Please refer to commit
daea696dbac0e33af3cfe304efbfb8d74e0effe6 for details.

>
> Are there any prerequisites for the userspace clients of
> EXT4_IOC_MOVE_EXT? Apart from having the offsets equal for orig and
> donor inode.
> The userspace program (part of OHSM) invoking the ioctl could be found at:
> http://ohsm.git.sourceforge.net/git/gitweb.cgi?p=ohsm/mkatiyar/.git;a=blob;f=userspace/relocate.c;h=ea0fa184ce4e692258a671cb0b9ace7a77b9fee9;hb=refs/heads/ohsm_next#l367
>
> [22145.440009] ------------[ cut here ]------------
> [22145.440019] kernel BUG at fs/ext4/move_extent.c:1317!
> [22145.440031] invalid opcode: 0000 [#10] SMP
> [22145.440044] last sysfs file:
> /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/ieee80211/phy0/rfkill2/state
> [22145.440059] Modules linked in: ohsm ext4 jbd2 crc16 af_packet ppdev
> rfcomm bridge stp bnep sco l2cap ipv6 pci_slot sbs sbshc container
> binfmt_misc autofs4sbp2 lp parport snd_hda_codec_analog snd_hda_intel
> snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy
> snd_seq_oss snd_seq_midi arc4 snd_rawmidi ecb joydev
> snd_seq_midi_event snd_seq iwlagn snd_timer iwlcore snd_seq_device
> mac80211 pcmcia snd btusb thinkpad_acpi led_class iTCO_wdt bluetooth
> cfg80211 psmouse yenta_socket rsrc_nonstatic pcmcia_core soundcore
> snd_page_alloc iTCO_vendor_support rfkill intel_agp agpgart pcspkr
> serio_raw wmi evdev nvram video output ac battery button processor
> ext3 jbd mbcache sr_mod cdrom sg ata_generic pata_acpi ohci1394
> ata_piix ieee1394 ehci_hcd uhci_hcd e1000e usbcore linear thermal fan
> fuse
> [22145.440314]
> [22145.440325] Pid: 7064, comm: ohsm Tainted: G      D    (2.6.31 #2) 7665AD6
> [22145.440336] EIP: 0060:[<f8722829>] EFLAGS: 00210246 CPU: 0
> [22145.440402] EIP is at ext4_move_extents+0x409/0x1600 [ext4]
> [22145.440412] EAX: fff8307e EBX: 00000000 ECX: ec2a7e30 EDX: ffffffff
> [22145.440425] ESI: f3b09ef0 EDI: 0000007d EBP: f3b09e88 ESP: f3b09da8
> [22145.440435]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [22145.440448] Process ohsm (pid: 7064, ti=f3b08000 task=f6083240
> task.ti=f3b08000)
> [22145.440456] Stack:
> [22145.440463]  f3b09e2c f8188be3 f3d59400 00000000 00000001 f3b09dd0
> ecce4ac0 f3d59400
> [22145.440489] <0> 00000000 f3d59402 00000000 f3f8ac68 f3b09e78
> f6307400 f5a2a500 00000001
> [22145.440515] <0> f61ecc00 f3b09e54 c149c640 c149c780 00000000
> 0007d9ff 0007d000 f6307400
> [22145.440544] Call Trace:
> [22145.440576]  [<f8188be3>] ? do_get_write_access+0x763/0xab0 [jbd2]
> [22145.440640]  [<f8711707>] ? __ext4_handle_dirty_metadata+0x47/0x1a0 [ext4]
> [22145.440664]  [<c0375c83>] ? security_capable+0x33/0x50
> [22145.440720]  [<f86e1463>] ? ext4_ioctl+0x273/0xfa0 [ext4]
> [22145.440779]  [<f870b3c6>] ? ext4_fallocate+0x5f6/0x610 [ext4]
> [22145.440835]  [<f86e11f0>] ? ext4_ioctl+0x0/0xfa0 [ext4]
> [22145.440852]  [<c02ca2ed>] ? vfs_ioctl+0x3d/0x110
> [22145.440866]  [<c028660f>] ? page_referenced+0x1cf/0x320
> [22145.440883]  [<c02cab71>] ? do_vfs_ioctl+0x5f1/0xae0
> [22145.440897]  [<c02ace42>] ? do_fallocate+0x172/0x210
> [22145.440913]  [<c02cb106>] ? sys_ioctl+0xa6/0x100
> [22145.440927]  [<c0104bdc>] ? sysenter_do_call+0x12/0x28
> [22145.440943]  [<c028660f>] ? page_referenced+0x1cf/0x320
> [22145.440951] Code: ba 75 f8 00 0f 0b eb fe 66 90 83 05 78 ba 75 f8
> 01 83 15 7c ba 75 f8 00 e9 56 fd ff ff 83 05 78 bd 75 f8 01 83 15 7c
> bd 75 f8 00 <0f> 0beb fe 8b 5d c8 8b 43 20 8b 5d cc 3b 43 20 74 35 8b
> 45 c8
> [22145.441098] EIP: [<f8722829>] ext4_move_extents+0x409/0x1600 [ext4]
> SS:ESP 0068:f3b09da8
> [22145.441193] ---[ end trace 67bb7ca457a8d69b ]---
> [/mnt]
> [18:35:13 sinhas]$
>
>
> --
> Regards,
> Sandeep.
>
>
>
>
>
>
> “To learn is to change. Education is a process that changes the learner.”
> --
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>



-- 
Cheers,
Peng Tao
State Key Laboratory of Networking and Switching Technology
Beijing Univ. of Posts and Telecoms.
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