Re: PROBLEM: 2.6.19.1 Oops while doing Disk IO + playing sound, 2.6.20 too

[Jan Kara]

On Sun 11-02-07 14:59:53, Frank Hartmann wrote:
> Jan Kara <jack@xxxxxxx> writes:
> >   OK, thanks for the news. Please, write me when you try out 2.6.20. Just
> > if it rings bell to someone on this list: It looks like the page had no
> > buffers but PagePrivate was set. Strange.
> 
> Hi Jan,
> 
> below is what I got using 2.6.20. 
> 
> Is there any correlation to my previous reports? Should I focus
> testing memory/disks/etc. further(and how?)? Or should I focus modifying kernel
> parameters(and which)? 
  Yes I see some correlation. Again it seems there is a problem with buffers
attached to a page which got truncated but Private flag of the page stayed.
It's probably not important but just out of curiosity - do you have
CONFIG_LBD (large block device) set? I'd just like to verify that page_bufs
was NULL when it was passed to walk_page_buffers().
  You said 2.6.17 worked for you, didn't you? How long does it take to
reproduce the problem? If it is reasonably easy (e.g. a few hours), could
you trace back when the problem started happening? If you could narrow that
problem down to a single patch (using git-bisect), that would be great.

							Bye
								Honza

> Feb 11 14:30:47 fantasio kernel: BUG: unable to handle kernel NULL pointer dereference at virtual address 0000002d
> Feb 11 14:30:47 fantasio kernel:  printing eip:
> Feb 11 14:30:47 fantasio kernel: e0c55b16
> Feb 11 14:30:47 fantasio kernel: *pde = 00000000
> Feb 11 14:30:47 fantasio kernel: Oops: 0000 [#1]
> Feb 11 14:30:48 fantasio kernel: Modules linked in: cbc blkcipher binfmt_misc bnep rfcomm l2cap nfs nfsd exportfs lockd sunrpc ip_tables bridge llc cryptoloop loop sha256 aes it87 hwmon_vid i2c_isa i2c_core md5 ipv6 af_packet radeon drm dm_crypt dm_mod snd_via82xx snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc analog snd_mpu401_uart rtc gameport snd_rawmidi snd via_agp agpgart prism54 8250_pnp 8250 serial_core evdev soundcore firmware_class sd_mod ext3 jbd mbcache raid1 raid0 multipath linear md_mod ide_cd cdrom ide_disk usbhid usb_storage via82cxxx ide_core via_rhine mii ehci_hcd uhci_hcd usbcore sym53c8xx scsi_transport_spi scsi_mod unix
> Feb 11 14:30:48 fantasio kernel: CPU:    0
> Feb 11 14:30:48 fantasio kernel: EIP:    0060:[pg0+546224918/1070154752]    Not tainted VLI
> Feb 11 14:30:48 fantasio kernel: EFLAGS: 00010202   (2.6.20 #1)
> Feb 11 14:30:48 fantasio kernel: EIP is at walk_page_buffers+0x1e/0x87 [ext3]
> Feb 11 14:30:48 fantasio kernel: eax: c38df601   ebx: 00002000   ecx: 00000029   edx: c38df601
> Feb 11 14:30:48 fantasio kernel: esi: 00002000   edi: c38df6ec   ebp: 00000000   esp: c14f5dbc
> Feb 11 14:30:48 fantasio kernel: ds: 007b   es: 007b   ss: 0068
> Feb 11 14:30:48 fantasio kernel: Process pdflush (pid: 134, ti=c14f4000 task=dfc04a70 task.ti=c14f4000)
> Feb 11 14:30:48 fantasio kernel: Stack: 00000029 00001000 00000000 dce96734 c104f700 c38df6ec dce96734 dce96734 
> Feb 11 14:30:48 fantasio kernel:        e0c5629b 00001000 00000000 e0c561b1 c14f5e38 0000000e c14f5f58 0000000a 
> Feb 11 14:30:48 fantasio kernel:        c104f700 0000000e c14f5f58 c0133584 00000000 0000000e 00000000 00000001 
> Feb 11 14:30:48 fantasio kernel: Call Trace:
> Feb 11 14:30:48 fantasio kernel:  [pg0+546226843/1070154752] ext3_ordered_writepage+0xcc/0x158 [ext3]
> Feb 11 14:30:48 fantasio kernel:  [pg0+546226609/1070154752] bget_one+0x0/0x6 [ext3]
> Feb 11 14:30:48 fantasio kernel:  [generic_writepages+380/690] generic_writepages+0x17c/0x2b2
> Feb 11 14:30:48 fantasio kernel:  [pg0+546226639/1070154752] ext3_ordered_writepage+0x0/0x158 [ext3]
> Feb 11 14:30:48 fantasio kernel:  [do_writepages+41/48] do_writepages+0x29/0x30
> Feb 11 14:30:48 fantasio kernel:  [__sync_single_inode+81/406] __sync_single_inode+0x51/0x196
> Feb 11 14:30:48 fantasio kernel:  [__writeback_single_inode+312/320] __writeback_single_inode+0x138/0x140
> Feb 11 14:30:48 fantasio kernel:  [schedule_timeout+121/141] schedule_timeout+0x79/0x8d
> Feb 11 14:30:48 fantasio kernel:  [process_timeout+0/5] process_timeout+0x0/0x5
> Feb 11 14:30:48 fantasio kernel:  [apic_timer_interrupt+40/48] apic_timer_interrupt+0x28/0x30
> Feb 11 14:30:48 fantasio kernel:  [congestion_wait+107/117] congestion_wait+0x6b/0x75
> Feb 11 14:30:48 fantasio kernel:  [autoremove_wake_function+0/51] autoremove_wake_function+0x0/0x33
> Feb 11 14:30:48 fantasio kernel:  [sync_sb_inodes+361/511] sync_sb_inodes+0x169/0x1ff
> Feb 11 14:30:48 fantasio kernel:  [writeback_inodes+67/100] writeback_inodes+0x43/0x64
> Feb 11 14:30:48 fantasio kernel:  [pdflush+0/40] pdflush+0x0/0x28
> Feb 11 14:30:48 fantasio kernel:  [background_writeout+88/137] background_writeout+0x58/0x89
> Feb 11 14:30:48 fantasio kernel:  [pdflush+0/40] pdflush+0x0/0x28
> Feb 11 14:30:48 fantasio kernel:  [__pdflush+179/309] __pdflush+0xb3/0x135
> Feb 11 14:30:48 fantasio kernel:  [pdflush+36/40] pdflush+0x24/0x28
> Feb 11 14:30:48 fantasio kernel:  [background_writeout+0/137] background_writeout+0x0/0x89
> Feb 11 14:30:48 fantasio kernel:  [pdflush+0/40] pdflush+0x0/0x28
> Feb 11 14:30:48 fantasio kernel:  [kthread+114/151] kthread+0x72/0x97
> Feb 11 14:30:48 fantasio kernel:  [kthread+0/151] kthread+0x0/0x97
> Feb 11 14:30:48 fantasio kernel:  [kernel_thread_helper+7/16] kernel_thread_helper+0x7/0x10
> Feb 11 14:30:48 fantasio kernel:  =======================
> Feb 11 14:30:48 fantasio kernel: Code: 06 fb ff ff ff 83 c4 0c 89 c8 5b 5e c3 55 31 ed 57 89 d7 56 31 f6 53 83 ec 10 89 4c 24 08 89 44 24 0c 89 d1 8b 42 10 89 44 24 04 <8b> 41 04 89 04 24 8b 44 24 04 8d 1c 06 3b 5c 24 08 0f 96 c2 3b 
> Feb 11 14:30:48 fantasio kernel: EIP: [pg0+546224918/1070154752] walk_page_buffers+0x1e/0x87 [ext3] SS:ESP 0068:c14f5dbc
> 
> 
> regards
>   Frank
-- 
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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