ext3 warning from mark_buffer_dirty after aborting journal

ext3 warning from mark_buffer_dirty after aborting journal

[Meelis Roos]

Just got this warning when running 2.6.29-rc + yesterdays git on 
sparc64. For some yet unknown reason, scsi disk goes repeatably offline 
during shutdown and this got a warning out of ext3. Is this an expected 
warning or does it need some attention?

Please CC: as I am not subscribed to linux-ext4.

[20639.424955] sd 0:0:0:0: rejecting I/O to offline device
[20639.488559] Aborting journal on device sda2.
[20639.538715] sd 0:0:0:0: rejecting I/O to offline device
[20639.607271] sd 0:0:0:0: rejecting I/O to offline device
[20639.670515] EXT3-fs error (device sda2): ext3_find_entry: reading directory #188427 offset 0
[20639.770755] Remounting filesystem read-only
[20639.821110] ------------[ cut here ]------------
[20639.876118] WARNING: at fs/buffer.c:1251 mark_buffer_dirty+0xa8/0xc0()
[20639.954215] Modules linked in: ipv6 ext2 loop
[20640.006202] Call Trace:
[20640.035492]  [000000000045cd6c] warn_slowpath+0x6c/0xc0
[20640.097999]  [0000000000508708] mark_buffer_dirty+0xa8/0xc0
[20640.164695]  [0000000000554b58] ext3_commit_super+0xb8/0x100
[20640.232396]  [00000000005563e8] ext3_handle_error+0x68/0xe0
[20640.299084]  [0000000000556530] ext3_error+0x50/0x60
[20640.358463]  [0000000000551ed4] ext3_find_entry+0x554/0x680
[20640.425137]  [00000000005529f0] ext3_lookup+0x30/0x160
[20640.486648]  [00000000004ebfb8] __lookup_hash+0xf8/0x140
[20640.550159]  [00000000004ec034] lookup_hash+0x34/0x60
[20640.610596]  [00000000004ef998] do_filp_open+0x238/0x7e0
[20640.674154]  [00000000004e0ab4] do_sys_open+0x54/0x100
[20640.735614]  [00000000004431bc] sparc32_open+0x1c/0x40
[20640.797080]  [0000000000406254] linux_sparc_syscall32+0x34/0x40
[20640.867912] ---[ end trace 747d11ba5876fcd1 ]---


-- 
Meelis Roos (mroos@linux.ee)

Re: ext3 warning from mark_buffer_dirty after aborting journal

[Jan Kara]

> Just got this warning when running 2.6.29-rc + yesterdays git on 
> sparc64. For some yet unknown reason, scsi disk goes repeatably offline 
> during shutdown and this got a warning out of ext3. Is this an expected 
> warning or does it need some attention?
  Yes, it is an expected warning. It is a result of the fact that we mix
IO error detection with tracking which buffers contain uptodate data
(the same flag is used) and this occasionally falsly triggers some
warning.
  Thanks for report anyway.

								Honza
> 
> Please CC: as I am not subscribed to linux-ext4.
> 
> [20639.424955] sd 0:0:0:0: rejecting I/O to offline device
> [20639.488559] Aborting journal on device sda2.
> [20639.538715] sd 0:0:0:0: rejecting I/O to offline device
> [20639.607271] sd 0:0:0:0: rejecting I/O to offline device
> [20639.670515] EXT3-fs error (device sda2): ext3_find_entry: reading directory #188427 offset 0
> [20639.770755] Remounting filesystem read-only
> [20639.821110] ------------[ cut here ]------------
> [20639.876118] WARNING: at fs/buffer.c:1251 mark_buffer_dirty+0xa8/0xc0()
> [20639.954215] Modules linked in: ipv6 ext2 loop
> [20640.006202] Call Trace:
> [20640.035492]  [000000000045cd6c] warn_slowpath+0x6c/0xc0
> [20640.097999]  [0000000000508708] mark_buffer_dirty+0xa8/0xc0
> [20640.164695]  [0000000000554b58] ext3_commit_super+0xb8/0x100
> [20640.232396]  [00000000005563e8] ext3_handle_error+0x68/0xe0
> [20640.299084]  [0000000000556530] ext3_error+0x50/0x60
> [20640.358463]  [0000000000551ed4] ext3_find_entry+0x554/0x680
> [20640.425137]  [00000000005529f0] ext3_lookup+0x30/0x160
> [20640.486648]  [00000000004ebfb8] __lookup_hash+0xf8/0x140
> [20640.550159]  [00000000004ec034] lookup_hash+0x34/0x60
> [20640.610596]  [00000000004ef998] do_filp_open+0x238/0x7e0
> [20640.674154]  [00000000004e0ab4] do_sys_open+0x54/0x100
> [20640.735614]  [00000000004431bc] sparc32_open+0x1c/0x40
> [20640.797080]  [0000000000406254] linux_sparc_syscall32+0x34/0x40
> [20640.867912] ---[ end trace 747d11ba5876fcd1 ]---
> 
> 
> -- 
> Meelis Roos (mroos@linux.ee)
> --
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-- 
Jan Kara <jack@suse.cz>
SuSE CR Labs