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    SubjectRE: PROBLEM: Oops when doing disk heavy disk I/O

    > -----Original Message-----
    > From: Sergio Monteiro Basto []
    > Sent: Wednesday, 25 October 2006 10:42 AM
    > well I don't know for sure , but after this initials Lost Timer tick ,
    > it appears more after a few time of uptime ?

    Well, when the machine was just sitting there, I don't get any lost timer
    ticks -- it's perfectly happy. However, I started to `dd if=/dev/zero
    of=/dev/hda6` again, and after a few minutes, it oops'ed again (below),
    losing 2 timer ticks: <4>time.c: Lost 2 timer tick(s)! rip

    Also, I rebooted and did the same command, but with bs=512K. It Oops'ed
    again (after about 30 seconds?), but this time, with:
    <4>time.c: Lost 1 timer tick(s)! rip _spin_unlock_irqrestore+0x8/0x9)
    Kernel panic - not syncing: Aiee, killing interrupt handler!

    It seems to be related to interrupts, somehow... since I'm not too familiar
    with what's happening, would anyone have any suggestions about what I could
    do next to troubleshoot?


    Full Oops:

    Unable to handle kernel NULL pointer dereference at 000000000000002b RIP:
    [<ffffffff8021a6c5>] __block_write_full_page+0xa4/0x2df
    PGD 7a312067 PUD 7a374067 PMD 0
    Oops: 0000 [1] SMP
    CPU 0
    Modules linked in:
    Pid: 263, comm: pdflush Not tainted 2.6.19-rc3 #1
    RIP: 0010:[<ffffffff8021a6c5>] [<ffffffff8021a6c5>]
    RSP: 0018:ffff810037ebbc30 EFLAGS: 00010287
    RAX: 0000000000000000 RBX: 000000000000002b RCX: 0000000000000002
    RDX: 000000000000000a RSI: 00000000000554a9 RDI: ffff810037cc8440
    RBP: ffff8100015f1c30 R08: ffff810037cc8440 R09: ffff810037ebbe70
    R10: ffffffff802bee4c R11: ffffffff80440b8b R12: ffff81001b2c9dc8
    R13: 00000000001552a7 R14: ffff810037cc8440 R15: 0000000001c42574
    FS: 00002b1c6f9536d0(0000) GS:ffffffff807d6000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    CR2: 000000000000002b CR3: 000000007a315000 CR4: 00000000000006e0
    Process pdflush (pid: 263, threadinfo ffff810037eba000, task
    Stack: ffff810037ebbe70 ffffffff802bee4c 00000400015f1c30 ffff8100015f1c30
    ffff810037ebbe70 ffff810037cc8550 000000000000000b ffff81007efe9b08
    0000000000000000 ffffffff8029db1e 000000000000000e ffffffff802bdff3
    Call Trace:
    [<ffffffff802bee4c>] blkdev_get_block+0x0/0x46
    [<ffffffff8029db1e>] generic_writepages+0x18e/0x2d8
    [<ffffffff802bdff3>] blkdev_writepage+0x0/0xf
    [<ffffffff8025591f>] do_writepages+0x20/0x2d
    [<ffffffff8022cf8c>] __writeback_single_inode+0x1b4/0x38b
    [<ffffffff8021f44f>] sync_sb_inodes+0x1d1/0x2b5
    [<ffffffff802897e0>] keventd_create_kthread+0x0/0x61
    [<ffffffff8024b3b7>] writeback_inodes+0x82/0xd8
    [<ffffffff8029dfb4>] background_writeout+0x82/0xb5
    [<ffffffff8025108f>] pdflush+0x0/0x1e3
    [<ffffffff802511c8>] pdflush+0x139/0x1e3
    [<ffffffff8029df32>] background_writeout+0x0/0xb5
    [<ffffffff8022f78a>] kthread+0xd1/0x101
    [<ffffffff80258ed8>] child_rip+0xa/0x12
    [<ffffffff802897e0>] keventd_create_kthread+0x0/0x61
    [<ffffffff8022f6b9>] kthread+0x0/0x101
    [<ffffffff80258ece>] child_rip+0x0/0x12

    Code: 8b 03 a8 20 75 6c 8b 03 a8 02 74 66 8b 44 24 14 48 39 43 20
    RIP [<ffffffff8021a6c5>] __block_write_full_page+0xa4/0x2df
    RSP <ffff810037ebbc30>
    CR2: 000000000000002b
    <4>time.c: Lost 2 timer tick(s)! rip __do_softirq+0x4a/0xc4)

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      Last update: 2006-10-25 03:29    [W:0.024 / U:0.540 seconds]
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