linux-kernel - Re: 2.6.33-rc1: kernel BUG at fs/ext4/inode.c:1063 (sparc)

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Date:	Fri, 25 Dec 2009 15:31:27 +0300
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	Alexander Beregalov <a.beregalov@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Jens Axboe <jens.axboe@...cle.com>,
	Theodore Ts'o <tytso@....edu>
Subject: Re: 2.6.33-rc1: kernel BUG at fs/ext4/inode.c:1063 (sparc)

Alexander Beregalov <a.beregalov@...il.com> writes:

> 2009/12/25 Alexander Beregalov <a.beregalov@...il.com>:
>> Hi
>>
>> Kernel is 2.6.33-rc1-00366-g2f99f5c
>> Ext4 mounts ext3 filesystem
>>
>>
>>
>> kernel BUG at fs/ext4/inode.c:1063!
>>              \|/ ____ \|/
>>              "@'/ .. \`@"
>>              /_| \__/ |_\
>>                 \__U_/
>> flush-8:0(1137): Kernel bad sw trap 5 [#1]
>> TSTATE: 0000000080001603 TPC: 0000000000544fb4 TNPC: 0000000000544fb8
>> Y: 00000000    Not tainted
>> TPC: <ext4_get_blocks+0x3f4/0x400>
>> g0: fffff800dc862fe0 g1: 0000000000000001 g2: 0000000000000001 g3:
>> fffff800dc85f9c1
>> g4: fffff800df305880 g5: 2e68006800002e68 g6: fffff800dc860000 g7:
>> 0000000000833e08
>> o0: 00000000007b0cb8 o1: 0000000000000427 o2: 0000000000000040 o3:
>> 0000000000000040
>> o4: fffff800dc8630a0 o5: 000000000000000d sp: fffff800dc8628d1 ret_pc:
>> 0000000000544fac
>> RPC: <ext4_get_blocks+0x3ec/0x400>
>> l0: 0000000000000002 l1: fffff800c2674000 l2: fffff800c26740d0 l3:
>> 0000000000000001
>> l4: fffff800df39d2d0 l5: 00000000000003f9 l6: 0006000000000000 l7:
>> 0000000000001ffe
>> i0: 0000000000000040 i1: fffff800c2674130 i2: 000000000000064c i3:
>> fffff800c26745a8
>> i4: fffff800dc863308 i5: 0000000000000003 i6: fffff800dc8629a1 i7:
>> 0000000000545380
>> I7: <mpage_da_map_blocks+0x80/0x800>
>> Disabling lock debugging due to kernel taint
>> Caller[0000000000545380]: mpage_da_map_blocks+0x80/0x800
>> Caller[00000000005461c0]: mpage_add_bh_to_extent+0x40/0x100
>> Caller[000000000054642c]: __mpage_da_writepage+0x1ac/0x220
>> Caller[00000000004a951c]: write_cache_pages+0x19c/0x380
>> Caller[0000000000545d7c]: ext4_da_writepages+0x27c/0x680
>> Caller[00000000004a978c]: do_writepages+0x2c/0x60
>> Caller[00000000004f94cc]: writeback_single_inode+0xcc/0x3c0
>> Caller[00000000004fa3d8]: writeback_inodes_wb+0x338/0x500
>> Caller[00000000004fa6e8]: wb_writeback+0x148/0x220
>> Caller[00000000004fab00]: wb_do_writeback+0x240/0x260
>> Caller[00000000004fab8c]: bdi_writeback_task+0x6c/0xc0
>> Caller[00000000004b6f50]: bdi_start_fn+0x70/0xe0
>> Caller[000000000047030c]: kthread+0x6c/0x80
>> Caller[000000000042bc9c]: kernel_thread+0x3c/0x60
>> Caller[0000000000470408]: kthreadd+0xe8/0x160
>> Instruction DUMP: 92102427  7ffb95a5  901220b8 <91d02005> 01000000
>> 01000000  9de3bf40  11002096  a4100018
>> note: flush-8:0[1137] exited with preempt_count 1
>>
>
> It seems I can easily reproduce it.
> But I can't compile 2.6.33-rc2 :)
>
> scripts/kconfig/conf -s arch/sparc/Kconfig
>   CHK     include/linux/version.h
>   CHK     include/generated/utsrelease.h
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   GZIP    kernel/config_data.gz
>   CC      fs/configfs/inode.o
>   IKCFG   kernel/config_data.h
>   LD [M]  fs/btrfs/btrfs.o
>   CC      kernel/configs.o
> fs/btrfs/sysfs.o: file not recognized: File truncated
This happens because of  delayed allocation. Each time BUG or
unexpected power off happens during object files usually becomes
broken. IMHO this is expected issue. Just recompile from beginning
# make clean; make -j4
As soon as your testcase is kernel compilation.
Strange i'm living with quota patches on my notebook more than
a month( two weeks with the version committed to quota git tree)
with and without quota . But this never happens.
Currently i'm trying to reproduce the bug on 2.6.33-rc2
Please add keep me in cc because seems the bug was introduced
(or just triggered) by my quota patches.
> make[2]: *** [fs/btrfs/btrfs.o] Error 1
> make[1]: *** [fs/btrfs] Error 2
> make[1]: *** Waiting for unfinished jobs....
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