Re: Advice needed with file system corruption

[Carlos Maiolino <cmaiolino@redhat.com>]

On Thu, Jul 14, 2016 at 02:57:25PM +0100, Steve Brooks wrote:
> Hi Carlos,
> 
> Many thanks again, for your good advice. I ran the version 4.3 of
> "xfs_repair" as suggested below and it did it's job very quickly in 50
> seconds exactly as reported in the "No modify mode". Is the time reported at
> the end of the "No modify mode" always a good approximation of running in
> "modify mode" ?

Good to know. But I'm not quite sure if the no modify mode could be used as a
good approximation of a real run. I would say to not take it as true giving that
xfs_repair can't predict the amount of time it will need to write all
modifications it needs to do on the filesystem's metadata, and it will certainly
can take much more time, depending on how corrupted the filesystem is.

> 
> Anyway all is good now and it looks like any missing files are now in the
> "lost+found" directory.
> 
> Steve
> 
> On 14/07/16 14:05, Carlos Maiolino wrote:
> > Hi steve.
> > 
> > On Thu, Jul 14, 2016 at 01:27:22PM +0100, Steve Brooks wrote:
> > > The "3.1.1"  version of "xfs_repair -n" ran in 1 minute, 32 seconds
> > > 
> > > The "4.3"     version of "xfs_repair -n" ran in 50 seconds
> > > 
> > Yes, the later versions are compatible with old disk-format filesystems,
> > and they have improvements in memory usage, speed, etc too
> > 
> > > So my questions are
> > > 
> > > [1] Which version of "xfs_repair" should I use to make the repair?
> > > 
> > > [2] Is there anything I should have done differently?
> > > 
> > No, just use the latest stable one, and the defaults, unless you have a good
> > reason to not use default options, which by your e-mail I believe you don't have
> > one.
> > 
> > The logs you send below, looks from a corrupted btree, but xfs_repair should be
> > able to fix that for you.
> > 
> > Cheers.
> > 
> > 
> > > Many thanks for any advice given it is much appreciated.
> > > 
> > > Thanks,  Steve
> > > 
> > > 
> > > 
> > > Many blocks (about 20) of code similar to this were repeated in the logs.
> > > 
> > > Jul  8 18:40:17 sraid1v kernel: ffff880dca95b000: 00 00 00 00 00 00 00 00 00
> > > 00 00 00 00 00 00 00  ................
> > > Jul  8 18:40:17 sraid1v kernel: XFS (sde): Internal error xfs_da_do_buf(2)
> > > at line 2136 of file fs/xfs/xfs_da_btree.c. Caller 0xffffffffa0e6e81a
> > > Jul  8 18:40:17 sraid1v kernel:
> > > Jul  8 18:40:17 sraid1v kernel: Pid: 8844, comm: idl Tainted: P           --
> > > ------------    2.6.32-642.el6.x86_64 #1
> > > Jul  8 18:40:17 sraid1v kernel: Call Trace:
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e7b68f>] ?
> > > xfs_error_report+0x3f/0x50 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e6e81a>] ?
> > > xfs_da_read_buf+0x2a/0x30 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e7b6fe>] ?
> > > xfs_corruption_error+0x5e/0x90 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e6e6fc>] ?
> > > xfs_da_do_buf+0x6cc/0x770 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e6e81a>] ?
> > > xfs_da_read_buf+0x2a/0x30 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff810154e3>] ?
> > > native_sched_clock+0x13/0x80
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e6e81a>] ?
> > > xfs_da_read_buf+0x2a/0x30 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e74a21>] ?
> > > xfs_dir2_leaf_lookup_int+0x61/0x2c0 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e74a21>] ?
> > > xfs_dir2_leaf_lookup_int+0x61/0x2c0 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e74e05>] ?
> > > xfs_dir2_leaf_lookup+0x35/0xf0 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e71306>] ?
> > > xfs_dir2_isleaf+0x26/0x60 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e71ce4>] ?
> > > xfs_dir_lookup+0x174/0x190 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e9ea47>] ? xfs_lookup+0x87/0x110
> > > [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0eabd74>] ?
> > > xfs_vn_lookup+0x54/0xa0 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811a9ca5>] ? do_lookup+0x1a5/0x230
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811aa823>] ?
> > > __link_path_walk+0x763/0x1060
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811ab3da>] ? path_walk+0x6a/0xe0
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811ab5eb>] ?
> > > filename_lookup+0x6b/0xc0
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff8123ac46>] ?
> > > security_file_alloc+0x16/0x20
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811acac4>] ?
> > > do_filp_open+0x104/0xd20
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffffa0e9a4fc>] ?
> > > _xfs_trans_commit+0x25c/0x310 [xfs]
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff812a749a>] ?
> > > strncpy_from_user+0x4a/0x90
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff811ba252>] ? alloc_fd+0x92/0x160
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff81196bd7>] ?
> > > do_sys_open+0x67/0x130
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff81196ce0>] ? sys_open+0x20/0x30
> > > Jul  8 18:40:17 sraid1v kernel: [<ffffffff8100b0d2>] ?
> > > system_call_fastpath+0x16/0x1b
> > > Jul  8 18:40:17 sraid1v kernel: XFS (sde): Corruption detected. Unmount and
> > > run xfs_repair
> > > Jul  8 18:40:17 sraid1v kernel: ffff880dca95b000: 00 00 00 00 00 00 00 00 00
> > > 00 00 00 00 00 00 00  ................
> > > Jul  8 18:40:17 sraid1v kernel: XFS (sde): Internal error xfs_da_do_buf(2)
> > > at line 2136 of file fs/xfs/xfs_da_btree.c. Caller 0xffffffffa0e6e81a
> > > Jul  8 18:40:17 sraid1v kernel:
> > > Jul  8 18:40:17 sraid1v kernel: Pid: 8844, comm: idl Tainted: P           --
> > > ------------    2.6.32-642.el6.x86_64 #1
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > 
> > > _______________________________________________
> > > xfs mailing list
> > > xfs@oss.sgi.com
> > > http://oss.sgi.com/mailman/listinfo/xfs
> 
> -- 
> Dr Stephen Brooks
> 
> Solar MHD Theory Group
> Tel    ::  01334 463735
> Fax    ::  01334 463748
> ---------------------------------------
> Mathematical Institute
> North Haugh
> University of St. Andrews
> St Andrews, Fife KY16 9SS
> SCOTLAND
> ---------------------------------------
> 
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-- 
Carlos

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