linux-kernel - Possible EXT2 race

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Date:	Fri, 7 Dec 2007 08:15:42 -0500
From:	"linux-os (Dick Johnson)" <linux-os@...logic.com>
To:	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Possible EXT2 race



On linux-2.6.22.1, executing the following script
while the mailer is writing to /var/spool/mail/linux-os.....


#!/bin/bash
while true ;
do
    >/var/spool/mail/linux-os;
    sleep 1;
done

...will cause the following errors to occur.

Dec  7 04:05:55 chaos kernel: sd 0:0:1:0: [sdb] Sense Key : No Sense [deferred] 
Dec  7 04:05:55 chaos kernel: Info fld=0x1980240
Dec  7 04:05:55 chaos kernel: sd 0:0:1:0: [sdb] Add. Sense: Peripheral device write fault
Dec  7 04:08:13 chaos kernel: attempt to access beyond end of device
Dec  7 04:08:13 chaos kernel: sdb1: rw=0, want=29687515944, limit=33736437
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_xattr_delete_inode: inode 656387: block -584027804 read error
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 3710940964, count = 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 4294967295, count = 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 4294967295, count = 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 3710940980, count = 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 3710940980, count = 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: bit already cleared for block 1
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_blocks: Freeing blocks not in datazone - block = 3710941012, count = 1
Dec  7 04:08:13 chaos kernel: attempt to access beyond end of device
Dec  7 04:08:13 chaos kernel: sdb1: rw=0, want=29687528104, limit=33736437
Dec  7 04:08:13 chaos kernel: EXT2-fs error (device sdb1): ext2_free_branches: Read failure, inode=656399, block=-584026284
Dec  7 04:08:13 chaos kernel: attempt to access beyond end of device
Dec  7 04:08:13 chaos kernel: sdb1: rw=0, want=29687529288, limit=33736437
Dec  7 04:08:15 chaos kernel: EXT2-fs error (device sdb1): ext2_xattr_delete_inode: inode 656400: block -584026136 read error
Dec  7 04:08:18 chaos kernel: EXT2-fs error (device sdb1): ext2_xattr_delete_inode: inode 656403: bad block 30188


Caution is advised when testing because this destroyed a filesystem,
making it unfixable by `fsck`.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.29 BogoMips).
My book : http://www.AbominableFirebug.com/
_


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