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    SubjectRe: [Bugme-new] [Bug 15610] New: fsck leads to swapper - BUG: unable to handle kernel NULL pointer dereference & panic

    ----- Original Message -----
    From: akpm@linux-foundation.org
    To: linux-kernel@vger.kernel.org, linux-mm@kvack.org
    Cc: bugzilla-daemon@bugzilla.kernel.org, bugme-daemon@bugzilla.kernel.org, ozgur.yuksel@oracle.com
    Sent: Monday, March 22, 2010 7:11:32 PM GMT +02:00 Athens, Beirut, Bucharest, Istanbul
    Subject: Re: [Bugme-new] [Bug 15610] New: fsck leads to swapper - BUG: unable to handle kernel NULL pointer dereference & panic


    (switched to email. Please respond via emailed reply-to-all, not via the
    bugzilla web interface).

    This is a post-2.6.33 regression.

    On Mon, 22 Mar 2010 15:59:44 GMT bugzilla-daemon@bugzilla.kernel.org wrote:

    > https://bugzilla.kernel.org/show_bug.cgi?id=15610
    >
    > Summary: fsck leads to swapper - BUG: unable to handle kernel
    > NULL pointer dereference & panic
    > Product: Memory Management
    > Version: 2.5
    > Kernel Version: 2.6.34-rc2-220bf991b0366cc50a94feede3d7341fa5710ee4
    > Platform: All
    > OS/Version: Linux
    > Tree: Mainline
    > Status: NEW
    > Severity: normal
    > Priority: P1
    > Component: Other
    > AssignedTo: akpm@linux-foundation.org
    > ReportedBy: ozgur.yuksel@oracle.com
    > Regression: No
    >
    >
    > During fsck.ext3 being performed (even with regular / clean forced runs), we
    > get a swapper crash:
    > [ 159.557737] BUG: unable to handle kernel NULL pointer dereference at (null)
    > [ 159.561687] IP: [<c01304aa>] __wake_up_common+0x1a/0x70

    err, what the heck? zone->wait_table didn't get initialised? I can't
    think of anything we did which might have caused that. Sorry to have
    to ask this, but... would it be possible for you to do a bisection of
    this? http://landley.net/writing/git-quick.html has some tips.

    Thanks.

    Sure. I'll give it a shot.
    Cheers,
    Ozgur

    > [ 159.561687] *pdpt = 0000000000853001 *pde = 0000000000000000
    > [ 159.561687] Oops: 0000 [#1] SMP
    > [ 159.561687] last sysfs file: /sys/kernel/uevent_seqnum
    > [ 159.561687] Modules linked in: snd_hda_codec_idt snd_hda_intel snd_hda_codec
    > snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcmt
    > [ 159.561687]
    > [ 159.561687] Pid: 0, comm: swapper Not tainted 2.6.34-rc2 #10 0KU184/Latitude
    > D630
    > [ 159.561687] EIP: 0060:[<c01304aa>] EFLAGS: 00010086 CPU: 1
    > [ 159.561687] EIP is at __wake_up_common+0x1a/0x70
    > [ 159.561687] EAX: c4f32f00 EBX: fffffff4 ECX: 00000001 EDX: 00000000
    > [ 159.561687] ESI: 00000003 EDI: 00000096 EBP: f747bc84 ESP: f747bc68
    > [ 159.561687] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
    > [ 159.561687] Process swapper (pid: 0, ti=f747a000 task=f743e600
    > task.ti=f747a000)
    > [ 159.561687] Stack:
    > [ 159.561687] f747bc70 00000001 00000003 c058d79a c4f32efc 00000003 00000096
    > f747bca4
    > [ 159.561687] <0> c0136cd7 00000000 f747bcb0 00000001 c0e00000 c07b2700
    > c0e00000 f747bcb8
    > [ 159.561687] <0> c0161689 f747bcb0 c0e00000 00000002 f747bcc8 c01616ea
    > c0e00000 c539be20
    > [ 159.561687] Call Trace:
    > [ 159.561687] [<c058d79a>] ? _raw_spin_lock_irqsave+0x2a/0x40
    > [ 159.561687] [<c0136cd7>] ? __wake_up+0x37/0x50
    > [ 159.561687] [<c0161689>] ? __wake_up_bit+0x29/0x30
    > [ 159.561687] [<c01616ea>] ? wake_up_bit+0x5a/0x60
    > [ 159.561687] [<c02199b1>] ? unlock_buffer+0x11/0x20
    > [ 159.561687] [<c0219b72>] ? end_buffer_async_read+0x62/0x120
    > [ 159.561687] [<c02191de>] ? end_bio_bh_io_sync+0x1e/0x40
    > [ 159.561687] [<c021cd35>] ? bio_endio+0x15/0x30
    > [ 159.561687] [<c030fb22>] ? req_bio_endio+0xa2/0x100
    > [ 159.561687] [<c0310889>] ? blk_update_request+0xe9/0x3e0
    > [ 159.561687] [<c011df46>] ? lapic_next_event+0x16/0x20
    > [ 159.561687] [<c016f6c7>] ? clockevents_program_event+0x87/0x140
    > [ 159.561687] [<c0310b96>] ? blk_update_bidi_request+0x16/0x60
    > [ 159.561687] [<c0311ad3>] ? blk_end_bidi_request+0x23/0x70
    > [ 159.561687] [<c0311b72>] ? blk_end_request+0x12/0x20
    > [ 159.561687] [<c03d1afe>] ? scsi_io_completion+0x8e/0x550
    > [ 159.561687] [<c03f9068>] ? ata_sff_hsm_move+0x188/0x770
    > [ 159.561687] [<c03d1953>] ? scsi_device_unbusy+0x93/0xa0
    > [ 159.561687] [<c03ca5a8>] ? scsi_finish_command+0x98/0x100
    > [ 159.561687] [<c03ce0ad>] ? scsi_decide_disposition+0x16d/0x1a0
    > [ 159.561687] [<c03d20db>] ? scsi_softirq_done+0x10b/0x130
    > [ 159.561687] [<c0317122>] ? blk_done_softirq+0x62/0x70
    > [ 159.561687] [<c014c4f0>] ? __do_softirq+0x90/0x1a0
    > [ 159.561687] [<c0120e4a>] ? ack_apic_level+0x6a/0x200
    > [ 159.561687] [<c014c63d>] ? do_softirq+0x3d/0x40
    > [ 159.561687] [<c014c79d>] ? irq_exit+0x5d/0x70
    > [ 159.561687] [<c01044e0>] ? do_IRQ+0x50/0xc0
    > [ 159.561687] [<c0167694>] ? sched_clock_local+0xa4/0x180
    > [ 159.561687] [<c01035b0>] ? common_interrupt+0x30/0x40
    > [ 159.561687] [<c016007b>] ? parse_args+0x23b/0x2d0
    > [ 159.561687] [<c037d4ae>] ? acpi_idle_enter_bm+0x25e/0x28f
    > [ 159.561687] [<c0486b6e>] ? cpuidle_idle_call+0x6e/0xf0
    > [ 159.561687] [<c0101d0c>] ? cpu_idle+0x8c/0xd0
    > [ 159.561687] [<c05888eb>] ? start_secondary+0x1f5/0x1fb
    > [ 159.561687] Code: 90 55 89 e5 e8 68 ff ff ff 5d c3 8d b6 00 00 00 00 55 89
    > e5 57 56 53 83 ec 10 89 55 ec 89 4d e8 8b 50
    > [ 159.561687] EIP: [<c01304aa>] __wake_up_common+0x1a/0x70 SS:ESP
    > 0068:f747bc68
    > [ 159.561687] CR2: 0000000000000000
    > [ 159.561687] ---[ end trace 0fd75502f6ca2e6e ]---
    >
    > and panic:
    > [ 159.561687] Kernel panic - not syncing: Fatal exception in interrupt
    > [ 159.561687] Pid: 0, comm: swapper Tainted: G D 2.6.34-rc2 #10
    > [ 159.561687] Call Trace:
    > [ 159.561687] [<c058b0a7>] ? printk+0x18/0x21
    > [ 159.561687] [<c058b01e>] panic+0x42/0xb3
    > [ 159.561687] [<c058ef87>] oops_end+0x97/0xa0
    > [ 159.561687] [<c0128e8e>] no_context+0xbe/0x190
    > [ 159.561687] [<c0128f97>] __bad_area_nosemaphore+0x37/0x160
    > [ 159.561687] [<c013fd41>] ? enqueue_task_fair+0x41/0x90
    > [ 159.561687] [<c012f649>] ? enqueue_task+0x79/0x90
    > [ 159.561687] [<c01290d2>] bad_area_nosemaphore+0x12/0x20
    > [ 159.561687] [<c0591106>] do_page_fault+0x2f6/0x380
    > [ 159.561687] [<c013ae5c>] ? try_to_wake_up+0x2bc/0x430
    > [ 159.561687] [<c0590e10>] ? do_page_fault+0x0/0x380
    > [ 159.561687] [<c058e463>] error_code+0x73/0x80
    > [ 159.561687] [<c013007b>] ? __sched_fork+0xcb/0x2b0
    > [ 159.561687] [<c01304aa>] ? __wake_up_common+0x1a/0x70
    > [ 159.561687] [<c058d79a>] ? _raw_spin_lock_irqsave+0x2a/0x40
    > [ 159.561687] [<c0136cd7>] __wake_up+0x37/0x50
    > [ 159.561687] [<c0161689>] __wake_up_bit+0x29/0x30
    > [ 159.561687] [<c01616ea>] wake_up_bit+0x5a/0x60
    > [ 159.561687] [<c02199b1>] unlock_buffer+0x11/0x20
    > [ 159.561687] [<c0219b72>] end_buffer_async_read+0x62/0x120
    > [ 159.561687] [<c02191de>] end_bio_bh_io_sync+0x1e/0x40
    > [ 159.561687] [<c021cd35>] bio_endio+0x15/0x30
    > [ 159.561687] [<c030fb22>] req_bio_endio+0xa2/0x100
    > [ 159.561687] [<c0310889>] blk_update_request+0xe9/0x3e0
    > [ 159.561687] [<c011df46>] ? lapic_next_event+0x16/0x20
    > [ 159.561687] [<c016f6c7>] ? clockevents_program_event+0x87/0x140
    > [ 159.561687] [<c0310b96>] blk_update_bidi_request+0x16/0x60
    > [ 159.561687] [<c0311ad3>] blk_end_bidi_request+0x23/0x70
    > [ 159.561687] [<c0311b72>] blk_end_request+0x12/0x20
    > [ 159.561687] [<c03d1afe>] scsi_io_completion+0x8e/0x550
    > [ 159.561687] [<c03f9068>] ? ata_sff_hsm_move+0x188/0x770
    > [ 159.561687] [<c03d1953>] ? scsi_device_unbusy+0x93/0xa0
    > [ 159.561687] [<c03ca5a8>] scsi_finish_command+0x98/0x100
    > [ 159.561687] [<c03ce0ad>] ? scsi_decide_disposition+0x16d/0x1a0
    > [ 159.561687] [<c03d20db>] scsi_softirq_done+0x10b/0x130
    > [ 159.561687] [<c0317122>] blk_done_softirq+0x62/0x70
    > [ 159.561687] [<c014c4f0>] __do_softirq+0x90/0x1a0
    > [ 159.561687] [<c0120e4a>] ? ack_apic_level+0x6a/0x200
    > [ 159.561687] [<c014c63d>] do_softirq+0x3d/0x40
    > [ 159.561687] [<c014c79d>] irq_exit+0x5d/0x70
    > [ 159.561687] [<c01044e0>] do_IRQ+0x50/0xc0
    > [ 159.561687] [<c0167694>] ? sched_clock_local+0xa4/0x180
    > [ 159.561687] [<c01035b0>] common_interrupt+0x30/0x40
    > [ 159.561687] [<c016007b>] ? parse_args+0x23b/0x2d0
    > [ 159.561687] [<c037d4ae>] ? acpi_idle_enter_bm+0x25e/0x28f
    > [ 159.561687] [<c0486b6e>] cpuidle_idle_call+0x6e/0xf0
    > [ 159.561687] [<c0101d0c>] cpu_idle+0x8c/0xd0
    > [ 159.561687] [<c05888eb>] start_secondary+0x1f5/0x1fb
    > [ 159.561687] [drm:drm_fb_helper_panic] *ERROR* panic occurred, switching back
    > to text console
    > ...
    > full serial console dump to be attached.
    >



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