* [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request
@ 2011-05-30 15:16 bugzilla-daemon
2011-05-31 18:21 ` [Bug 36262] " bugzilla-daemon
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-05-30 15:16 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
Summary: ext3 umount: BUG: unable to handle kernel paging
request
Product: File System
Version: 2.5
Kernel Version: 2.6.39
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext3
AssignedTo: fs_ext3@kernel-bugs.osdl.org
ReportedBy: rl@hellgate.ch
Regression: No
Created an attachment (id=60122)
--> (https://bugzilla.kernel.org/attachment.cgi?id=60122)
BUG screenshot
Umounting a USB disk using ext3 resulted in this kernel bug (screenshot
attached).
Only happened once.
The machine has 8 GB RAM. To the best of my knowledge, it was rather lightly
loaded; most of the memory use at the time was probably disk cache.
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* [Bug 36262] ext3 umount: BUG: unable to handle kernel paging request
2011-05-30 15:16 [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request bugzilla-daemon
@ 2011-05-31 18:21 ` bugzilla-daemon
2011-06-01 5:57 ` bugzilla-daemon
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-05-31 18:21 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
Jan Kara <jack@suse.cz> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jack@suse.cz, tj@kernel.org
--- Comment #1 from Jan Kara <jack@suse.cz> 2011-05-31 18:21:28 ---
Can you post here output of disassemble of __percpu_counter_add? You can get
that by running gdb on vmlinux and then doing 'disass __percpu_counter_add'.
Thanks.
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* [Bug 36262] ext3 umount: BUG: unable to handle kernel paging request
2011-05-30 15:16 [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request bugzilla-daemon
2011-05-31 18:21 ` [Bug 36262] " bugzilla-daemon
@ 2011-06-01 5:57 ` bugzilla-daemon
2011-06-02 10:23 ` bugzilla-daemon
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-06-01 5:57 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
--- Comment #2 from Roger Luethi <rl@hellgate.ch> 2011-06-01 05:57:06 ---
Dump of assembler code for function __percpu_counter_add:
0xc0391638 <+0>: push %ebp
0xc0391639 <+1>: mov %esp,%ebp
0xc039163b <+3>: push %edi
0xc039163c <+4>: mov %eax,%edi
0xc039163e <+6>: push %esi
0xc039163f <+7>: mov $0x1,%eax
0xc0391644 <+12>: push %ebx
0xc0391645 <+13>: sub $0x14,%esp
0xc0391648 <+16>: mov %edx,-0x18(%ebp)
0xc039164b <+19>: mov %ecx,-0x1c(%ebp)
0xc039164e <+22>: call 0xc05bdf1d <add_preempt_count>
0xc0391653 <+27>: mov 0x30(%edi),%eax
0xc0391656 <+30>: mov -0x18(%ebp),%edx
0xc0391659 <+33>: mov %eax,-0x20(%ebp)
0xc039165c <+36>: mov -0x1c(%ebp),%ecx
0xc039165f <+39>: mov %fs:(%eax),%ebx
0xc0391662 <+42>: mov 0x8(%ebp),%eax
0xc0391665 <+45>: mov %ebx,%esi
0xc0391667 <+47>: mov %eax,-0x14(%ebp)
0xc039166a <+50>: sar $0x1f,%esi
0xc039166d <+53>: add %edx,%ebx
0xc039166f <+55>: adc %ecx,%esi
0xc0391671 <+57>: cltd
0xc0391672 <+58>: mov %edx,-0x10(%ebp)
0xc0391675 <+61>: cmp %edx,%esi
0xc0391677 <+63>: jl 0xc0391686 <__percpu_counter_add+78>
0xc0391679 <+65>: jg 0xc039167f <__percpu_counter_add+71>
0xc039167b <+67>: cmp %eax,%ebx
0xc039167d <+69>: jb 0xc0391686 <__percpu_counter_add+78>
0xc039167f <+71>: mov $0x1,%edx
0xc0391684 <+76>: jmp 0xc03916a9 <__percpu_counter_add+113>
0xc0391686 <+78>: mov 0x8(%ebp),%edx
0xc0391689 <+81>: neg %edx
0xc039168b <+83>: mov %edx,%ecx
0xc039168d <+85>: mov %edx,-0x14(%ebp)
0xc0391690 <+88>: sar $0x1f,%ecx
0xc0391693 <+91>: mov $0x1,%edx
0xc0391698 <+96>: mov %ecx,-0x10(%ebp)
0xc039169b <+99>: cmp -0x10(%ebp),%esi
0xc039169e <+102>: jl 0xc03916a9 <__percpu_counter_add+113>
0xc03916a0 <+104>: jg 0xc03916a7 <__percpu_counter_add+111>
0xc03916a2 <+106>: cmp -0x14(%ebp),%ebx
0xc03916a5 <+109>: jbe 0xc03916a9 <__percpu_counter_add+113>
0xc03916a7 <+111>: xor %edx,%edx
0xc03916a9 <+113>: mov -0x3f65dc64(,%edx,4),%ecx
0xc03916b0 <+120>: inc %ecx
0xc03916b1 <+121>: test %edx,%edx
0xc03916b3 <+123>: mov %ecx,-0x3f65dc64(,%edx,4)
0xc03916ba <+130>: je 0xc03916dc <__percpu_counter_add+164>
0xc03916bc <+132>: mov %edi,%eax
0xc03916be <+134>: call 0xc05b923a <_raw_spin_lock>
0xc03916c3 <+139>: add %ebx,0x20(%edi)
0xc03916c6 <+142>: mov 0x30(%edi),%eax
0xc03916c9 <+145>: adc %esi,0x24(%edi)
0xc03916cc <+148>: movl $0x0,%fs:(%eax)
0xc03916d3 <+155>: mov %edi,%eax
0xc03916d5 <+157>: call 0xc05b9ce5 <_raw_spin_unlock>
0xc03916da <+162>: jmp 0xc03916e2 <__percpu_counter_add+170>
0xc03916dc <+164>: mov -0x20(%ebp),%eax
0xc03916df <+167>: mov %ebx,%fs:(%eax)
0xc03916e2 <+170>: mov $0x1,%eax
0xc03916e7 <+175>: call 0xc05bdd76 <sub_preempt_count>
0xc03916ec <+180>: xor %ecx,%ecx
0xc03916ee <+182>: mov %esp,%eax
0xc03916f0 <+184>: and $0xffffe000,%eax
0xc03916f5 <+189>: mov 0x8(%eax),%ebx
0xc03916f8 <+192>: mov $0xc08ee9a8,%eax
0xc03916fd <+197>: shr $0x3,%ebx
0xc0391700 <+200>: and $0x1,%ebx
0xc0391703 <+203>: mov %ebx,%edx
0xc0391705 <+205>: call 0xc01e513f <ftrace_likely_update>
0xc039170a <+210>: mov -0x3f65dc78(,%ebx,4),%eax
0xc0391711 <+217>: inc %eax
0xc0391712 <+218>: test %ebx,%ebx
0xc0391714 <+220>: mov %eax,-0x3f65dc78(,%ebx,4)
0xc039171b <+227>: je 0xc0391722 <__percpu_counter_add+234>
0xc039171d <+229>: call 0xc05b6228 <preempt_schedule>
0xc0391722 <+234>: add $0x14,%esp
0xc0391725 <+237>: pop %ebx
0xc0391726 <+238>: pop %esi
0xc0391727 <+239>: pop %edi
0xc0391728 <+240>: leave
0xc0391729 <+241>: ret
End of assembler dump.
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* [Bug 36262] ext3 umount: BUG: unable to handle kernel paging request
2011-05-30 15:16 [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request bugzilla-daemon
2011-05-31 18:21 ` [Bug 36262] " bugzilla-daemon
2011-06-01 5:57 ` bugzilla-daemon
@ 2011-06-02 10:23 ` bugzilla-daemon
2011-06-02 11:44 ` bugzilla-daemon
2012-08-24 12:50 ` bugzilla-daemon
4 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-06-02 10:23 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
Jan Kara <jack@suse.cz> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |axboe@kernel.dk
--- Comment #3 from Jan Kara <jack@suse.cz> 2011-06-02 10:23:12 ---
Hmm, by any chance, was the USB disk pulled before the umount actually run?
Jens, it seems we have destroyed the BDI before the filesystem was properly
unmounted (the oops is just NULL pointer dereference hidden by new percpu code)
because fbc->counters == NULL for the BDI_RECLAIMABLE stats counter.
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* [Bug 36262] ext3 umount: BUG: unable to handle kernel paging request
2011-05-30 15:16 [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request bugzilla-daemon
` (2 preceding siblings ...)
2011-06-02 10:23 ` bugzilla-daemon
@ 2011-06-02 11:44 ` bugzilla-daemon
2012-08-24 12:50 ` bugzilla-daemon
4 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2011-06-02 11:44 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
--- Comment #4 from Roger Luethi <rl@hellgate.ch> 2011-06-02 11:44:01 ---
(In reply to comment #3)
> Hmm, by any chance, was the USB disk pulled before the umount actually run?
I am pretty sure it was not.
However, the disk seems to have some sort of autosuspend feature: if unused for
some time, it spins down the disk. When used again, it comes up okay (after a
few seconds). That's all from memory, let me know if you need me to verify or
test.
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* [Bug 36262] ext3 umount: BUG: unable to handle kernel paging request
2011-05-30 15:16 [Bug 36262] New: ext3 umount: BUG: unable to handle kernel paging request bugzilla-daemon
` (3 preceding siblings ...)
2011-06-02 11:44 ` bugzilla-daemon
@ 2012-08-24 12:50 ` bugzilla-daemon
4 siblings, 0 replies; 6+ messages in thread
From: bugzilla-daemon @ 2012-08-24 12:50 UTC (permalink / raw)
To: linux-ext4
https://bugzilla.kernel.org/show_bug.cgi?id=36262
Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |alan@lxorguk.ukuu.org.uk
Resolution| |OBSOLETE
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