On Tue 28-07-09 13:27:15, Sylvain Rochet wrote: > On Mon, Jul 27, 2009 at 05:42:53PM +0200, Jan Kara wrote: > > On Sat 25-07-09 17:17:52, Sylvain Rochet wrote: > > > > > > > > Can you still see the corruption with 2.6.30 kernel? > > > > > > Not upgraded yet, we'll give a try. > > Done, now featuring 2.6.30.3 ;) OK, drop me an email if you will see corruption also with this kernel. > > > > If you can still see this problem, could you run: debugfs /dev/md10 > > > > and send output of the command: > > > > stat <40420228> > > > > (or whatever the corrupted inode number will be) > > > > and also: > > > > dump <40420228> /tmp/corrupted_dir > > > > > > One inode get corrupted recently, here is the output: > > > > > > root@bazooka:/data/web/ed/90/48/walotux.walon.org/htdocs/tmp/cache/e# ls -lai > > > total 64 > > > 88539836 drwxr-sr-x 2 18804 23084 4096 2009-07-25 07:53 . > > > 88539821 drwxr-sr-x 20 18804 23084 4096 2008-08-20 10:14 .. > > > 88541578 -rw-rw-rw- 1 18804 23084 471 2009-07-25 04:55 -inc_forum-10-wa.3cb1921f > > > 88541465 -rw-rw-rw- 1 18804 23084 6693 2009-07-25 07:53 -inc_rss_item-32-wa.23d91cc2 > > > 88541471 -rw-rw-rw- 1 18804 23084 1625 2009-07-25 07:53 -inc_rubriques-17-wa.f2f152f0 > > > 88541549 -rw-rw-rw- 1 18804 23084 2813 2009-07-25 03:04 INDEX-.edfac52c > > > 88541366 -rw-rw-rw- 1 18804 23084 0 2008-08-17 20:44 .ok > > > ? ?--------- ? ? ? ? ? spip%3Farticle19.f8740dca > > > 88541671 -rw-rw-rw- 1 18804 23084 5619 2009-07-24 21:07 spip%3Fauteur1.c64f7f7e > > > 88541460 -rw-rw-rw- 1 18804 23084 5636 2009-07-24 19:30 spip%3Fmot5.f3e9adda > > > 88540284 -rw-rw-rw- 1 18804 23084 3802 2009-07-25 16:10 spip%3Fpage%3Dforum-30.63b2c1b1 > > > 88541539 -rw-rw-rw- 1 18804 23084 12972 2009-07-25 11:14 spip%3Fpage%3Djquery.cce608b6.gz > > OK, so we couldn't stat a directory... > > > > > root@bazooka:/data/web/ed/90/48/walotux.walon.org/htdocs/tmp/cache/e# cat spip%3Farticle19.f8740dca > > > cat: spip%3Farticle19.f8740dca: Stale NFS file handle > > This is probably the misleading output from ext3_iget(). It should give > > you EIO in the latest kernel. > > root@bazooka:/data/web/ed/90/48/walotux.walon.org/htdocs/tmp/cache/e# cat spip%3Farticle19.f8740dca > cat: spip%3Farticle19.f8740dca: Input/output error > > It has much more sense now. We thought the problem was around NFS due > the the previous error message, actually this is probably not the best > looking path. Yes, EIO makes more sence. I think the problem is NFS connected anyway though :). But I don't have a clue how it can happen yet. Maybe I can try adding some low-cost debugging checks if you'd be willing to run such kernel... I'm adding to CC linux-nfs just in case someone has an idea. > > > root@bazooka:~# debugfs /dev/md10 > > > debugfs 1.40-WIP (14-Nov-2006) > > > > > > debugfs: stat <88539836> > > > > > > Inode: 88539836 Type: directory Mode: 0755 Flags: 0x0 Generation: 791796957 > > > User: 18804 Group: 23084 Size: 4096 > > > File ACL: 0 Directory ACL: 0 > > > Links: 2 Blockcount: 8 > > > Fragment: Address: 0 Number: 0 Size: 0 > > > ctime: 0x4a6a9dd5 -- Sat Jul 25 07:53:25 2009 > > > atime: 0x4a0de585 -- Fri May 15 23:58:29 2009 > > > mtime: 0x4a6a9dd5 -- Sat Jul 25 07:53:25 2009 > > > Size of extra inode fields: 4 > > > BLOCKS: > > > (0):177096928 > > > TOTAL: 1 > > > > > > > > > debugfs: ls <88539836> > > > > > > 88539836 (12) . 88539821 (32) .. 88541366 (12) .ok > > > 88541465 (56) -inc_rss_item-32-wa.23d91cc2 > > > 88541539 (40) spip%3Fpage%3Djquery.cce608b6.gz > > > 88540284 (40) spip%3Fpage%3Dforum-30.63b2c1b1 > > > 88541460 (28) spip%3Fmot5.f3e9adda > > > 88541471 (160) -inc_rubriques-17-wa.f2f152f0 > > > 88541549 (24) INDEX-.edfac52c 88541578 (284) -inc_forum-10-wa.3cb1921f > > > 88541562 (36) spip%3Farticle19.f8740dca > > > 88541671 (3372) spip%3Fauteur1.c64f7f7e > > The directory itself looks fine... > > > > > debugfs: stat <88541562> > > > > > > Inode: 88541562 Type: regular Mode: 0666 Flags: 0x0 Generation: 860068541 > > > User: 18804 Group: 23084 Size: 0 > > > File ACL: 0 Directory ACL: 0 > > > Links: 0 Blockcount: 0 > > > Fragment: Address: 0 Number: 0 Size: 0 > > > ctime: 0x4a6a8fac -- Sat Jul 25 06:53:00 2009 > > > atime: 0x4a6a612f -- Sat Jul 25 03:34:39 2009 > > > mtime: 0x4a6a8fac -- Sat Jul 25 06:53:00 2009 > > > dtime: 0x4a6a8fac -- Sat Jul 25 06:53:00 2009 > > > Size of extra inode fields: 4 > > > BLOCKS: > > > > Ah, OK, here's the problem. The directory points to a file which is > > obviously deleted (note the "Links: 0"). All the content of the inode seems > > to indicate that the file was correctly deleted (you might check that the > > corresponding bit in the bitmap is cleared via: "icheck 88541562"). > > root@bazooka:~# debugfs /dev/md10 > debugfs 1.40-WIP (14-Nov-2006) > debugfs: icheck 88541562 > Block Inode number > 88541562 <block not found> Ah, wrong debugfs command. I should have written: testi <88541562> > > The question is how it could happen the directory still points to the > > inode. Really strange. It looks as if we've lost a write to the directory > > but I don't see how. Are there any suspitious kernel messages in this case? > > There were nothing for a while, but since the reboot there are some > about this inode: > > EXT3-fs error (device md10): ext3_lookup: deleted inode referenced: 88541562 Yes, that's to be expected given the corruption any NFS error messages? > > > We'll try. > > > > It probably won't help. This particular directory had just one block so > > DIR_INDEX had no effect on it. > > Let's keep dir_index for now, then. OK. > > OK, so it's probably not a storage device problem. Good to know. > > We also thought about motherboard, CPU, or chassis issues, but > everything has been replaced. > > > The check of the MD raid6 array always ends happily: > > Jul 5 01:06:01 bazooka kernel: md: data-check of RAID array md10 > Jul 5 01:06:01 bazooka kernel: md: minimum _guaranteed_ speed: 1000 KB/sec/disk. > Jul 5 01:06:01 bazooka kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for data-check. > Jul 5 01:06:01 bazooka kernel: md: using 128k window, over a total of 143373888 blocks. > Jul 5 04:28:28 bazooka kernel: md: md10: data-check done. > > > We never saw modification to the data of files themselves, maybe it > happened, but we never saw any evidence of that. Of course, due to the > modification of the filesystem structure, we saw files replaced by other > files ;) Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
