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Re: File system corruption

To: <xfs@xxxxxxxxxxx>
Subject: Re: File system corruption
From: Wayne Walker <wwalker@xxxxxxxxxxxxxx>
Date: Thu, 11 Oct 2012 13:03:24 -0500
In-reply-to: <5077077A.3040608@xxxxxxxxxxxxxx>
References: <5077077A.3040608@xxxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0
On 10/11/2012 12:52 PM, Wayne Walker wrote:
In short, I am able to: mkfs...; mount...; cp 1gbfile...; sync; cp 1gbfile...; sync # and now the xfs is corrupt

I see multiple bugs

1. very simple, non-corner-case actions create a corrupted file system
2. corrupt data is knowingly written to the file system.
3. the file system stays online and writable
4. future write operations to the file system return success.

Details:
<snip>

I left out that the files written to disk have data after the first 4K, but the first 4K is 0's..

And I left out the dmesg info:

XFS mounting filesystem sde1
Ending clean XFS mount for filesystem: sde1
ffff880d244f1200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Filesystem "sde1": XFS internal error xfs_alloc_read_agf at line 2157 of file fs/xfs/xfs_alloc.c. Caller 0xffffffffa01c0989

Pid: 18009, comm: flush-8:64 Not tainted 2.6.32-71.29.1.el6.x86_64 #1
Call Trace:
 [<ffffffffa01eacc3>] xfs_error_report+0x43/0x50 [xfs]
 [<ffffffffa01c0989>] ? xfs_alloc_read_agf+0x39/0xe0 [xfs]
 [<ffffffffa01ead2a>] xfs_corruption_error+0x5a/0x70 [xfs]
 [<ffffffffa01c08af>] xfs_read_agf+0xef/0x190 [xfs]
 [<ffffffffa01c0989>] ? xfs_alloc_read_agf+0x39/0xe0 [xfs]
 [<ffffffff81156a90>] ? cache_alloc_refill+0x1c0/0x240
 [<ffffffffa01c0989>] xfs_alloc_read_agf+0x39/0xe0 [xfs]
 [<ffffffffa01c2dd4>] xfs_alloc_fix_freelist+0x2f4/0x480 [xfs]
 [<ffffffff812593c9>] ? cpumask_next_and+0x29/0x50
 [<ffffffff81062c74>] ? find_busiest_group+0x254/0xb40
 [<ffffffffa0203fc8>] ? xfs_perag_get+0x48/0xc0 [xfs]
 [<ffffffffa01c3193>] xfs_alloc_vextent+0x173/0x600 [xfs]
 [<ffffffffa0203fc8>] ? xfs_perag_get+0x48/0xc0 [xfs]
 [<ffffffffa01cd2a7>] xfs_bmap_btalloc+0x167/0x9d0 [xfs]
 [<ffffffffa01cdb1e>] xfs_bmap_alloc+0xe/0x10 [xfs]
 [<ffffffffa01d4696>] xfs_bmapi+0x9f6/0x11a0 [xfs]
 [<ffffffffa01fd3c0>] ? xfs_log_reserve+0xf0/0x150 [xfs]
 [<ffffffff814cad26>] ? down_write+0x16/0x40
 [<ffffffffa01f6b75>] xfs_iomap_write_allocate+0x1c5/0x3b0 [xfs]
 [<ffffffff81264e08>] ? call_rwsem_wake+0x18/0x30
 [<ffffffffa01f78b9>] xfs_iomap+0x389/0x440 [xfs]
 [<ffffffff8119633b>] ? __mark_inode_dirty+0x3b/0x160
 [<ffffffffa0210dbd>] xfs_map_blocks+0x2d/0x40 [xfs]
 [<ffffffffa0212408>] xfs_page_state_convert+0x2f8/0x750 [xfs]
 [<ffffffff8125ec05>] ? radix_tree_gang_lookup_tag_slot+0x95/0xe0
 [<ffffffffa0212a16>] xfs_vm_writepage+0x86/0x170 [xfs]
 [<ffffffff8111f6e7>] __writepage+0x17/0x40
 [<ffffffff81120979>] write_cache_pages+0x189/0x430
 [<ffffffff8111f6d0>] ? __writepage+0x0/0x40
 [<ffffffff81120c44>] generic_writepages+0x24/0x30
 [<ffffffffa02117fe>] xfs_vm_writepages+0x5e/0x80 [xfs]
 [<ffffffff81120c71>] do_writepages+0x21/0x40
 [<ffffffff8119694d>] writeback_single_inode+0xdd/0x2c0
 [<ffffffff81196d4e>] writeback_sb_inodes+0xce/0x180
 [<ffffffff81196ea3>] writeback_inodes_wb+0xa3/0x1a0
 [<ffffffff8119723b>] wb_writeback+0x29b/0x3f0
 [<ffffffff814c92b6>] ? thread_return+0x4e/0x778
 [<ffffffff8119744b>] wb_do_writeback+0xbb/0x240
 [<ffffffff81197633>] bdi_writeback_task+0x63/0x1b0
 [<ffffffff81091d67>] ? bit_waitqueue+0x17/0xd0
 [<ffffffff8112f040>] ? bdi_start_fn+0x0/0x100
 [<ffffffff8112f0c6>] bdi_start_fn+0x86/0x100
 [<ffffffff8112f040>] ? bdi_start_fn+0x0/0x100
 [<ffffffff81091b36>] kthread+0x96/0xa0
 [<ffffffff810141ca>] child_rip+0xa/0x20
 [<ffffffff81091aa0>] ? kthread+0x0/0xa0
 [<ffffffff810141c0>] ? child_rip+0x0/0x20
Filesystem "sde1": page discard on page ffffea0003cfc418, inode 0x1004, offset 0.

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