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    SubjectRe: 2.6.33-rc2+ bug in fs/btrfs/ordered-data.c:672
    From
    On Mon, Jan 4, 2010 at 8:22 AM, Johannes Hirte
    <johannes.hirte@fem.tu-ilmenau.de> wrote:
    > Am Samstag 02 Januar 2010 23:34:17 schrieb Carlos R. Mafra:
    >> On Sa  2.Jan'10 at 11:32:27 +0100, Carlos R. Mafra wrote:
    >> > I started testing btrfs for my /home a few days ago and yesterday
    >> > I hit a kernel bug, using 2.6.33-rc2-00187-g08d869a.
    >> >
    >> > I wasn't doing any stress test with it, I was simply watching a
    >> > DVD with xine while chrome was open in another workspace.
    >>
    >> Today I hit the bug twice, and it was always with chrome. I've
    >> seen the other two reports in kerneloops.org involving
    >> btrfs_ordered_update_i_size() and chrome was there too.
    >>
    >> And now I saved the dmesg in the ext3 partition, so now there
    >> is no need for the photo,
    >>
    >>
    >> [13450.613952] ------------[ cut here ]------------
    >> [13450.613957] kernel BUG at fs/btrfs/ordered-data.c:672!
    >> [13450.613960] invalid opcode: 0000 [#1] SMP
    >> [13450.613963] last sysfs file:
    >>  /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq [13450.613966] CPU 1
    >> [13450.613970] Pid: 3372, comm: chrome Not tainted
    >>  2.6.33-rc2-fs-00187-g08d869a #293 VAIO/VGN-FZ240E [13450.613973] RIP:
    >>  0010:[<ffffffff811d9537>]  [<ffffffff811d9537>]
    >>  btrfs_ordered_update_i_size+0x237/0x3d0 [13450.613982] RSP:
    >>  0018:ffff880071355da8  EFLAGS: 00010287
    >> [13450.613984] RAX: ffff88007f0c0728 RBX: 0000000000000000 RCX:
    >>  ffff880077c0c6a8 [13450.613986] RDX: 00000000002b5000 RSI:
    >>  0000000000000000 RDI: ffff880077c0c6b8 [13450.613989] RBP:
    >>  ffff880071355e18 R08: 0000000000000000 R09: 0000000000000000
    >>  [13450.613991] R10: 0000000000000000 R11: 0000000000000000 R12:
    >>  ffff8800729dd260 [13450.613993] R13: 00000000002b4b24 R14:
    >>  0000000000000000 R15: 00000000002b4b24 [13450.613996] FS:
    >>  00007f2b3db68910(0000) GS:ffff880001b00000(0000) knlGS:0000000000000000
    >>  [13450.613999] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    >> [13450.614001] CR2: 00007f2b3c2a4000 CR3: 0000000071167000 CR4:
    >>  00000000000006e0 [13450.614003] DR0: 0000000000000000 DR1:
    >>  0000000000000000 DR2: 0000000000000000 [13450.614005] DR3:
    >>  0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    >>  [13450.614008] Process chrome (pid: 3372, threadinfo ffff880071354000,
    >>  task ffff88007d380640) [13450.614010] Stack:
    >> [13450.614011]  ffff8800729dd0c0 0000000000000000 fffffffffffff000
    >>  0000000000000fff [13450.614015] <0> ffff8800729dd0f0 ffff88007c7cc000
    >>  ffff8800729dd0c0 ffff8800729dd170 [13450.614019] <0> ffff880071355e18
    >>  ffff880071355ee8 ffff8800729dd260 0000000000000000 [13450.614023] Call
    >>  Trace:
    >> [13450.614028]  [<ffffffff811c915d>] btrfs_setattr+0x17d/0x270
    >> [13450.614033]  [<ffffffff810e5fe4>] notify_change+0x104/0x2e0
    >> [13450.614037]  [<ffffffff810ce84f>] do_truncate+0x5f/0x90
    >> [13450.614041]  [<ffffffff810d0002>] ? vfs_write+0x132/0x180
    >> [13450.614044]  [<ffffffff810cef79>] sys_ftruncate+0xe9/0x130
    >> [13450.614049]  [<ffffffff81002dab>] system_call_fastpath+0x16/0x1b
    >> [13450.614050] Code: 0f 1f 40 00 eb 88 66 0f 1f 44 00 00 49 8b 84 24 38 ff
    >>  ff ff 48 85 c0 74 1b 48 8b 50 98 49 39 d5 72 12 48 03 50 a8 49 39 d5 73 09
    >>  <0f> 0b eb fe 0f 1f 44 00 00 49 8b 94 24 30 ff ff ff 48 89 55 b8
    >>  [13450.614082] RIP  [<ffffffff811d9537>]
    >>  btrfs_ordered_update_i_size+0x237/0x3d0 [13450.614087]  RSP
    >>  <ffff880071355da8>
    >> [13450.614090] ---[ end trace 74172209f4d15206 ]---
    >
    > Sounds like the bug reported here: http://article.gmane.org/gmane.comp.file-
    > systems.btrfs/4332/match=btrfs+fails+randomly. Can you try the patch provided
    > in that thread?
    >
    I have sent a patch for this.
    http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg03686.html

    Regards
    Yan, Zheng
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