Re: Kernel bug: mm/rmap.c:483 and related {now 2.6.8}

Re: Kernel bug: mm/rmap.c:483 and related {now 2.6.8}

[Jay Roplekar]

>Thanks for giving that a thorough run, memory seems exonerated... yet I
>don't trust this machine at all: have you tried manufacturer diagnostics?

Ouch, that hurts. This is a machine I built myself over three years ago. Ran 
very stably with 2.4.*.  may be  it is the age of the machine.  The  recent 
hardware changes are additions of a dvd writer, a hdd and a pci wireless 
card. Which  seem to work ok until recently. What other diagnostics would 
make sense? 

>> Jan 29 08:25:02 Bad page state at prep_new_page ('X', page c1251ae0)
>> Jan 29 08:25:02 flags:0x20000004 mapping:00006a00 mapcount:0 count:0

>Again, something I've not seen reported before: mapping:00006a00, when
>mapping should be NULL (or at least a pointer into kernel memory).  You
>say message reappeared twice with identical addresses: was that mapping
>the same each time?

Hmm, it is different one time, as shown below.. I guess should have looked 
carefully. Although  it means nothing to me..  FWIW, please  note that in all 
these cases  ndiswrapper (windows driver loader) is being used. Thanks, Jay

Jan 29 08:27:03 localhost kernel: Bad page state at prep_new_page (in process 
'X', page c1253a60)
Jan 29 08:27:03 localhost kernel: flags:0x20000004 mapping:00006a00 mapcount:0 
count:0

Jan 29 08:27:08 localhost kernel: Bad page state at prep_new_page (in process 
'X', page c12965e0)
Jan 29 08:27:08 localhost kernel: flags:0x20000004 mapping:00006600 mapcount:0 
count:0

Re: Kernel bug: mm/rmap.c:483 and related {now 2.6.8}

[Hugh Dickins]

On Mon, 31 Jan 2005, Jayant Roplekar wrote:
> I had reported a week ago that with  a custom 2.6.10 (tainted with ndiswrapper
> a windows driver loader) I got error above and that I could not reproduce it

Yes, at that time you had a page being allocated while both page_count
and page_mapcount were 1, strongly suggesting it was already in use.
And not matching any other Bad page warnings or rmap.c BUGs reported.

> after Hugh Dickins patch to 2.6.10.  Now I have sudden rash of similar errors
> and lock ups with 2.6.8.1-10mdk  (my daily use kernel)  in the last couple of
> days.  This *does not* use Hugh's patch.

> I ran memtest overnight with 19 passes and no errors.

Thanks for giving that a thorough run, memory seems exonerated... yet I
don't trust this machine at all: have you tried manufacturer diagnostics?

> I  have VIA motherboard and a matrox AGP card.  Following might be relevant
> CONFIG_AGP_VIA=m
> CONFIG_DRM=y
> CONFIG_DRM_MGA=m

> #### Following message appears three times in syslog at (Jan 29 08:27:03)
> #### and at (Jan 29 08:27:08) with identical addresses and
> #### then the machine was rebooted
> Jan 29 08:25:02 Bad page state at prep_new_page ('X', page c1251ae0)
> Jan 29 08:25:02 flags:0x20000004 mapping:00006a00 mapcount:0 count:0

Again, something I've not seen reported before: mapping:00006a00, when
mapping should be NULL (or at least a pointer into kernel memory).  You
say message reappeared twice with identical addresses: was that mapping
the same each time?  bad_page would reset it to NULL each time non-NULL
found there.  But since that non-NULL doesn't look at all like a kernel
address, it seems something is scribbling on your mem_map array of
struct pages: I've no idea what.

Hugh

> #### After the reboot there were no issues. On the next boot half an hour
> #### after the boot following stuff appears in the log
> 
> Jan 30 08:33:38 kernel BUG at mm/rmap.c:407!
> Jan 30 08:33:38 invalid operand: 0000 [#1]
> Jan 30 08:33:38 EIP:    0060:[page_remove_rmap+68/112] Not tainted VLI
> Jan 30 08:33:38 eax: 00000000 ebx: 00104000 ecx: c039f1d0 edx: c1327000
> Jan 30 08:33:38 esi: cda49530 edi: 0032b000 ebp: cd02bb78 esp: cd02bb78
> Jan 30 08:33:38 Process net_applet (pid: 5428, threadinfo=cd02a000 task=d125da30)

> Jan 30 08:53:37 kernel BUG at mm/rmap.c:407!
> Jan 30 08:53:37 invalid operand: 0000 [#2]
> Jan 30 08:53:37 EIP:    0060:[page_remove_rmap+68/112] Not tainted VLI
> Jan 30 08:53:37 eax: 00000000 ebx: 0031c000 ecx: c039f1d0 edx: c1191a00
> Jan 30 08:53:37 esi: cd5edc70 edi: 0038d000 ebp: d1475e74 esp: d1475e74
> Jan 30 08:53:37 Process pixie (pid: 4271, threadinfo=d1474000 task=d1471480)

> Jan 30 08:53:37 Bad page state at prep_new_page ('kjournald', page c1191a00)
> Jan 30 08:53:37 flags:0x20000014 mapping:00000000 mapcount:0 count:0

> #### The machine was up for 4 hours after the above, then there was
> #### following error which I think is due to above, then I had to do a power
> #### button due to lockup
> 
> Jan 30 13:32:01 Assertion failure in journal_dirty_data() at
> fs/jbd/transaction.c:985: "jh->b_transaction == journal->j_committing_transaction"
> Jan 30 13:32:01 kernel BUG at fs/jbd/transaction.c:985!

Kernel bug: mm/rmap.c:483 and related {now 2.6.8}

[Jayant Roplekar]

I had reported a week ago that with  a custom 2.6.10 (tainted with 
ndiswrapper
a windows driver loader) I got error above and that I could not reproduce it
after Hugh Dickins patch to 2.6.10.  Now I have sudden rash of similar 
errors
and lock ups with 2.6.8.1-10mdk  (my daily use kernel)  in the last couple 
of
days.  This *does not* use Hugh's patch.  I ran  memtest overnight with 19
passes and no errors.   I am enclosing all the lines from /var/log/messages 
apparently
related  to mm  errors [ I am a kernel newbie] .  Thanks,

Jay
P.S. This is 250 lines post, you can jump to  commentary  by searching for 
####
#### As a recap:
I  have VIA motherboard and a matrox AGP card.  Following might be relevant
CONFIG_AGP_VIA=m
CONFIG_DRM=y
CONFIG_DRM_MGA=m

#### Following message appears three times in syslog at (Jan 29 08:27:03 )
####  and at  (Jan 29 08:27:08)  with identical  addresses  and
####  then the machine was rebooted
Jan 29 08:25:02 localhost kernel: Bad page state at prep_new_page (in 
process
'X', page c1251ae0)
Jan 29 08:25:02 localhost kernel: flags:0x20000004 mapping:00006a00 
mapcount:0
count:0
Jan 29 08:25:02 localhost kernel: Backtrace:
Jan 29 08:25:02 localhost kernel:  [dump_stack+30/32] dump_stack+0x1e/0x20
Jan 29 08:25:02 localhost kernel:  [<c0107bfe>] dump_stack+0x1e/0x20
Jan 29 08:25:02 localhost kernel:  [bad_page+108/160] bad_page+0x6c/0xa0
Jan 29 08:25:02 localhost kernel:  [<c013d63c>] bad_page+0x6c/0xa0
Jan 29 08:25:02 localhost kernel:  [prep_new_page+40/112]
prep_new_page+0x28/0x70
Jan 29 08:25:02 localhost kernel:  [<c013d968>] prep_new_page+0x28/0x70
Jan 29 08:25:02 localhost kernel:  [buffered_rmqueue+216/384]
buffered_rmqueue+0xd8/0x180
Jan 29 08:25:02 localhost kernel:  [<c013de58>] buffered_rmqueue+0xd8/0x180
Jan 29 08:25:02 localhost kernel:  [__alloc_pages+161/752]
__alloc_pages+0xa1/0x2f0
Jan 29 08:25:02 localhost kernel:  [<c013dfa1>] __alloc_pages+0xa1/0x2f0
Jan 29 08:25:02 localhost kernel:  [do_anonymous_page+102/368]
do_anonymous_page+0x66/0x170
Jan 29 08:25:02 localhost kernel:  [<c0148796>] do_anonymous_page+0x66/0x170
Jan 29 08:25:03 localhost kernel:  [do_no_page+95/816] do_no_page+0x5f/0x330
Jan 29 08:25:03 localhost kernel:  [<c01488ff>] do_no_page+0x5f/0x330
Jan 29 08:25:03 localhost kernel:  [handle_mm_fault+341/416]
handle_mm_fault+0x155/0x1a0
Jan 29 08:25:03 localhost kernel:  [<c0148e15>] handle_mm_fault+0x155/0x1a0
Jan 29 08:25:03 localhost kernel:  [do_page_fault+396/1456]
do_page_fault+0x18c/0x5b0
Jan 29 08:25:03 localhost kernel:  [<c01198ec>] do_page_fault+0x18c/0x5b0
Jan 29 08:25:03 localhost kernel:  [error_code+45/56] error_code+0x2d/0x38
Jan 29 08:25:03 localhost kernel:  [<c0107849>] error_code+0x2d/0x38
Jan 29 08:25:03 localhost kernel: Trying to fix it up, but a reboot is 
needed

#### After the reboot there were no issues. On the next boot half an hour
####  after the boot following stuff appears in the log
Jan 30 08:33:38 localhost kernel: ------------[ cut here ]------------
Jan 30 08:33:38 localhost kernel: kernel BUG at mm/rmap.c:407!
Jan 30 08:33:38 localhost kernel: invalid operand: 0000 [#1]
Jan 30 08:33:38 localhost kernel: Modules linked in: sd_mod usb-storage
scsi_mod mga md5 ipv6 snd-seq-oss snd-seq-midi-event snd-seq snd-pcm-oss
snd-mixer-oss snd-via82xx snd-ac97-codec snd-pcm snd-timer snd-page-alloc
gameport snd-mpu401-uart snd-rawmidi snd-seq-device snd soundcore af_packet
fealnx mii eth1394 ide-cd cdrom ohci1394 ieee1394 loop ntfs nls_iso8859-1
nls_cp437 vfat fat ndiswrapper via-agp agpgart uhci-hcd usbcore genrtc ext3
jbd
Jan 30 08:33:38 localhost kernel: CPU:    0
Jan 30 08:33:38 localhost kernel: EIP:    0060:[page_remove_rmap+68/112]
Not tainted VLI
Jan 30 08:33:38 localhost kernel: EIP:    0060:[<c014d204>]    Not tainted 
VLI
Jan 30 08:33:38 localhost kernel: EFLAGS: 00010246   (2.6.8.1-10mdk)
Jan 30 08:33:38 localhost kernel: EIP is at page_remove_rmap+0x44/0x70
Jan 30 08:33:38 localhost kernel: eax: 00000000   ebx: 00104000   ecx:
c039f1d0   edx: c1327000
Jan 30 08:33:38 localhost kernel: esi: cda49530   edi: 0032b000   ebp:
cd02bb78   esp: cd02bb78
Jan 30 08:33:38 localhost kernel: ds: 007b   es: 007b   ss: 0068
Jan 30 08:33:38 localhost kernel: Process net_applet (pid: 5428,
threadinfo=cd02a000 task=d125da30)
Jan 30 08:33:38 localhost kernel: Stack: cd02bba4 c014718a c1327000 00000080
00000080 cfbd8ec0 19380045 c1327000
Jan 30 08:33:38 localhost kernel:        08c48000 ce93b08c 08b73000 cd02bbd4
c0147332 c039f1d0 ce93b088 08848000
Jan 30 08:33:38 localhost kernel:        0032b000 00000000 00000000 c039f1d0
08848000 ce93b08c 08b73000 cd02bbfc
Jan 30 08:33:38 localhost kernel: Call Trace:
Jan 30 08:33:38 localhost kernel:  [show_stack+127/160] show_stack+0x7f/0xa0
Jan 30 08:33:38 localhost kernel:  [<c0107bbf>] show_stack+0x7f/0xa0
Jan 30 08:33:38 localhost kernel:  [show_registers+342/464]
show_registers+0x156/0x1d0
Jan 30 08:33:38 localhost kernel:  [<c0107d56>] show_registers+0x156/0x1d0
Jan 30 08:33:38 localhost kernel:  [die+102/208] die+0x66/0xd0
Jan 30 08:33:38 localhost kernel:  [<c0107ef6>] die+0x66/0xd0
Jan 30 08:33:38 localhost kernel:  [do_invalid_op+159/192]
do_invalid_op+0x9f/0xc0
Jan 30 08:33:38 localhost kernel:  [<c01082df>] do_invalid_op+0x9f/0xc0
Jan 30 08:33:38 localhost kernel:  [error_code+45/56] error_code+0x2d/0x38
Jan 30 08:33:38 localhost kernel:  [<c0107849>] error_code+0x2d/0x38
Jan 30 08:33:38 localhost kernel:  [zap_pte_range+314/640]
zap_pte_range+0x13a/0x280
Jan 30 08:33:38 localhost kernel:  [<c014718a>] zap_pte_range+0x13a/0x280
Jan 30 08:33:38 localhost kernel:  [zap_pmd_range+98/128]
zap_pmd_range+0x62/0x80
Jan 30 08:33:38 localhost kernel:  [<c0147332>] zap_pmd_range+0x62/0x80
Jan 30 08:33:38 localhost kernel:  [unmap_page_range+85/144]
unmap_page_range+0x55/0x90
Jan 30 08:33:38 localhost kernel:  [<c01473a5>] unmap_page_range+0x55/0x90
Jan 30 08:33:38 localhost kernel:  [unmap_vmas+249/448] 
unmap_vmas+0xf9/0x1c0
Jan 30 08:33:38 localhost kernel:  [<c01474d9>] unmap_vmas+0xf9/0x1c0
Jan 30 08:33:38 localhost kernel:  [exit_mmap+122/320] exit_mmap+0x7a/0x140
Jan 30 08:33:38 localhost kernel:  [<c014b62a>] exit_mmap+0x7a/0x140
Jan 30 08:33:38 localhost kernel:  [mmput+73/96] mmput+0x49/0x60
Jan 30 08:33:38 localhost kernel:  [<c011c769>] mmput+0x49/0x60
Jan 30 08:33:38 localhost kernel:  [exec_mmap+153/272] exec_mmap+0x99/0x110
Jan 30 08:33:38 localhost kernel:  [<c0160c29>] exec_mmap+0x99/0x110
Jan 30 08:33:38 localhost kernel:  [flush_old_exec+91/560]
flush_old_exec+0x5b/0x230
Jan 30 08:33:38 localhost kernel:  [<c0160d5b>] flush_old_exec+0x5b/0x230
Jan 30 08:33:38 localhost kernel:  [load_elf_binary+910/3328]
load_elf_binary+0x38e/0xd00
Jan 30 08:33:38 localhost kernel:  [<c017d8de>] load_elf_binary+0x38e/0xd00
Jan 30 08:33:38 localhost kernel:  [search_binary_handler+101/512]
search_binary_handler+0x65/0x200
Jan 30 08:33:38 localhost kernel:  [<c0161705>]
search_binary_handler+0x65/0x200
Jan 30 08:33:38 localhost kernel:  [do_execve+384/560] do_execve+0x180/0x230
Jan 30 08:33:38 localhost kernel:  [<c0161a20>] do_execve+0x180/0x230
Jan 30 08:33:38 localhost kernel:  [sys_execve+59/144] sys_execve+0x3b/0x90
Jan 30 08:33:38 localhost kernel:  [<c0105aab>] sys_execve+0x3b/0x90
Jan 30 08:33:38 localhost kernel:  [sysenter_past_esp+82/113]
sysenter_past_esp+0x52/0x71
Jan 30 08:33:38 localhost kernel:  [<c0106dcd>] sysenter_past_esp+0x52/0x71
Jan 30 08:33:38 localhost kernel: Code: 08 75 26 8b 02 a9 00 00 10 00 74 12 
8b
42 10 85 c0 74 2c c7 42 10 00 00 00 00 0f ba 32 14 9c 58 fa ff 0d f0 80 3c 
c0
50 9d 5d c3 <0f> 0b 97 01 85 37 2e c0 eb c6 0f 0b 96 01 85 37 2e c0 eb b5 0f
Jan 30 08:53:37 localhost kernel:  ------------[ cut here ]------------
Jan 30 08:53:37 localhost kernel: kernel BUG at mm/rmap.c:407!
Jan 30 08:53:37 localhost kernel: invalid operand: 0000 [#2]
Jan 30 08:53:37 localhost kernel: Modules linked in: sd_mod usb-storage
scsi_mod mga md5 ipv6 snd-seq-oss snd-seq-midi-event snd-seq snd-pcm-oss
snd-mixer-oss snd-via82xx snd-ac97-codec snd-pcm snd-timer snd-page-alloc
gameport snd-mpu401-uart snd-rawmidi snd-seq-device snd soundcore af_packet
fealnx mii eth1394 ide-cd cdrom ohci1394 ieee1394 loop ntfs nls_iso8859-1
nls_cp437 vfat fat ndiswrapper via-agp agpgart uhci-hcd usbcore genrtc ext3
jbd
Jan 30 08:53:37 localhost kernel: CPU:    0
Jan 30 08:53:37 localhost kernel: EIP:    0060:[page_remove_rmap+68/112]
Not tainted VLI
Jan 30 08:53:37 localhost kernel: EIP:    0060:[<c014d204>]    Not tainted 
VLI
Jan 30 08:53:37 localhost kernel: EFLAGS: 00210246   (2.6.8.1-10mdk)
Jan 30 08:53:37 localhost kernel: EIP is at page_remove_rmap+0x44/0x70
Jan 30 08:53:37 localhost kernel: eax: 00000000   ebx: 0031c000   ecx:
c039f1d0   edx: c1191a00
Jan 30 08:53:37 localhost kernel: esi: cd5edc70   edi: 0038d000   ebp:
d1475e74   esp: d1475e74
Jan 30 08:53:37 localhost kernel: ds: 007b   es: 007b   ss: 0068
Jan 30 08:53:37 localhost kernel: Process pixie (pid: 4271,
threadinfo=d1474000 task=d1471480)
Jan 30 08:53:37 localhost kernel: Stack: d1475ea0 c014718a c1191a00 4278b000
00000001 d1475ed4 0c8d0067 c1191a00
Jan 30 08:53:37 localhost kernel:        42c00000 d262242c 42b8d000 d1475ed0
c0147332 c039f1d0 d2622428 42800000
Jan 30 08:53:37 localhost kernel:        0038d000 00000000 00000000 c039f1d0
42800000 d262242c 42b8d000 d1475ef8
Jan 30 08:53:37 localhost kernel: Call Trace:
Jan 30 08:53:37 localhost kernel:  [show_stack+127/160] show_stack+0x7f/0xa0
Jan 30 08:53:37 localhost kernel:  [<c0107bbf>] show_stack+0x7f/0xa0
Jan 30 08:53:37 localhost kernel:  [show_registers+342/464]
show_registers+0x156/0x1d0
Jan 30 08:53:37 localhost kernel:  [<c0107d56>] show_registers+0x156/0x1d0
Jan 30 08:53:37 localhost kernel:  [die+102/208] die+0x66/0xd0
Jan 30 08:53:37 localhost kernel:  [<c01082df>] do_invalid_op+0x9f/0xc0
Jan 30 08:53:37 localhost kernel:  [error_code+45/56] error_code+0x2d/0x38
Jan 30 08:53:37 localhost kernel:  [<c0107849>] error_code+0x2d/0x38
Jan 30 08:53:37 localhost kernel:  [zap_pte_range+314/640]
zap_pte_range+0x13a/0x280
Jan 30 08:53:37 localhost kernel:  [<c014718a>] zap_pte_range+0x13a/0x280
Jan 30 08:53:37 localhost kernel:  [zap_pmd_range+98/128]
zap_pmd_range+0x62/0x80
Jan 30 08:53:37 localhost kernel:  [<c0147332>] zap_pmd_range+0x62/0x80
Jan 30 08:53:37 localhost kernel:  [unmap_page_range+85/144]
unmap_page_range+0x55/0x90
Jan 30 08:53:37 localhost kernel:  [<c01473a5>] unmap_page_range+0x55/0x90
Jan 30 08:53:37 localhost kernel:  [unmap_vmas+249/448] 
unmap_vmas+0xf9/0x1c0
Jan 30 08:53:37 localhost kernel:  [<c01474d9>] unmap_vmas+0xf9/0x1c0
Jan 30 08:53:37 localhost kernel:  [unmap_region+110/224]
unmap_region+0x6e/0xe0
Jan 30 08:53:37 localhost kernel:  [<c014af6e>] unmap_region+0x6e/0xe0
Jan 30 08:53:37 localhost kernel:  [do_munmap+290/416] do_munmap+0x122/0x1a0
Jan 30 08:53:37 localhost kernel:  [<c014b272>] do_munmap+0x122/0x1a0
Jan 30 08:53:37 localhost kernel:  [sys_munmap+67/112] sys_munmap+0x43/0x70
Jan 30 08:53:37 localhost kernel:  [<c014b333>] sys_munmap+0x43/0x70
Jan 30 08:53:37 localhost kernel:  [sysenter_past_esp+82/113]
sysenter_past_esp+0x52/0x71
Jan 30 08:53:37 localhost kernel:  [<c0106dcd>] sysenter_past_esp+0x52/0x71
Jan 30 08:53:37 localhost kernel: Code: 08 75 26 8b 02 a9 00 00 10 00 74 12 
8b
42 10 85 c0 74 2c c7 42 10 00 00 00 00 0f ba 32 14 9c 58 fa ff 0d f0 80 3c 
c0
50 9d 5d c3 <0f> 0b 97 01 85 37 2e c0 eb c6 0f 0b 96 01 85 37 2e c0 eb b5 0f
Jan 30 08:53:37 localhost kernel:  <0>Bad page state at prep_new_page (in
process 'kjournald', page c1191a00)
Jan 30 08:53:37 localhost kernel: flags:0x20000014 mapping:00000000 
mapcount:0
count:0
Jan 30 08:53:37 localhost kernel: Backtrace:
Jan 30 08:53:37 localhost kernel:  [dump_stack+30/32] dump_stack+0x1e/0x20
Jan 30 08:53:37 localhost kernel:  [<c0107bfe>] dump_stack+0x1e/0x20
Jan 30 08:53:37 localhost kernel:  [bad_page+108/160] bad_page+0x6c/0xa0
Jan 30 08:53:37 localhost kernel:  [<c013d63c>] bad_page+0x6c/0xa0
Jan 30 08:53:37 localhost kernel:  [prep_new_page+40/112]
prep_new_page+0x28/0x70
Jan 30 08:53:37 localhost kernel:  [<c013d968>] prep_new_page+0x28/0x70
Jan 30 08:53:37 localhost kernel:  [buffered_rmqueue+216/384]
buffered_rmqueue+0xd8/0x180
Jan 30 08:53:37 localhost kernel:  [<c013de58>] buffered_rmqueue+0xd8/0x180
Jan 30 08:53:37 localhost kernel:  [__alloc_pages+161/752]
__alloc_pages+0xa1/0x2f0
Jan 30 08:53:37 localhost kernel:  [<c013dfa1>] __alloc_pages+0xa1/0x2f0
Jan 30 08:53:37 localhost kernel:  [find_or_create_page+102/192]
find_or_create_page+0x66/0xc0
Jan 30 08:53:37 localhost kernel:  [<c013a026>] 
find_or_create_page+0x66/0xc0
Jan 30 08:53:37 localhost kernel:  [grow_dev_page+48/320]
grow_dev_page+0x30/0x140
Jan 30 08:53:37 localhost kernel:  [<c0158bf0>] grow_dev_page+0x30/0x140
Jan 30 08:53:37 localhost kernel:  [__getblk_slow+190/384]
__getblk_slow+0xbe/0x180
Jan 30 08:53:37 localhost kernel:  [<c0158dbe>] __getblk_slow+0xbe/0x180
Jan 30 08:53:37 localhost kernel:  [__getblk+87/96] __getblk+0x57/0x60
Jan 30 08:53:37 localhost kernel:  [<c01591c7>] __getblk+0x57/0x60
Jan 30 08:53:37 localhost kernel:  [pg0+541281953/1069604864]
journal_get_descriptor_buffer+0x51/0xb0 [jbd]
Jan 30 08:53:37 localhost kernel:  [<e0824ea1>]
journal_get_descriptor_buffer+0x51/0xb0 [jbd]
Jan 30 08:53:37 localhost kernel:  [pg0+541269430/1069604864]
journal_commit_transaction+0xa66/0x1020 [jbd]
Jan 30 08:53:37 localhost kernel:  [<e0821db6>]
journal_commit_transaction+0xa66/0x1020 [jbd]
Jan 30 08:53:37 localhost kernel:  [pg0+541279318/1069604864]
kjournald+0xa6/0x1f0 [jbd]
Jan 30 08:53:37 localhost kernel:  [<e0824456>] kjournald+0xa6/0x1f0 [jbd]
Jan 30 08:53:37 localhost kernel:  [kernel_thread_helper+5/16]
kernel_thread_helper+0x5/0x10
Jan 30 08:53:37 localhost kernel:  [<c01052c5>] 
kernel_thread_helper+0x5/0x10
Jan 30 08:53:37 localhost kernel: Trying to fix it up, but a reboot is 
needed

#### The machine was up for  4 hours after the above,  then there was
#### following error which  I think is due to above, then I had to do a 
power
#### button due to  lockup
Jan 30 13:32:01 localhost kernel: Assertion failure in journal_dirty_data() 
at
fs/jbd/transaction.c:985: "jh->b_transaction ==
journal->j_committing_transaction"
Jan 30 13:32:01 localhost kernel: ------------[ cut here ]------------
Jan 30 13:32:01 localhost kernel: kernel BUG at fs/jbd/transaction.c:985!