Date:	Fri, 18 Jul 2008 13:19:48 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	"Josef Bacik" <jbacik@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: ext2 on latest -git: BUG: unable to handle kernel paging request at f0f0fffc

Hi,

I got this with an intentionally corrupted filesystem image. Before
mounting, I explicitly disabled continue-on-error, like this:

        tune2fs -f disk -e remount-ro
        mount -o loop disk mnt

loop0: rw=0, want=4201400, limit=24576
Buffer I/O error on device loop0, logical block 2100699
attempt to access beyond end of device
loop0: rw=0, want=4201400, limit=24576
Buffer I/O error on device loop0, logical block 2100699
EXT2-fs error (device loop0): ext2_free_blocks: Freeing blocks not in
datazone - block = 131072, count = 1
Remounting filesystem read-only
BUG: unable to handle kernel paging request at f0f0fffc
IP: [<c026ee46>] read_block_bitmap+0xc6/0x180
*pde = 343bf163 *pte = 30f0f160
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Pid: 11241, comm: rm Not tainted (2.6.26-03415-gdf3030b #45)
EIP: 0060:[<c026ee46>] EFLAGS: 00210297 CPU: 1
EIP is at read_block_bitmap+0xc6/0x180
EAX: ffffffff EBX: f0f10000 ECX: f4349030 EDX: 00000001
ESI: f3facbc8 EDI: f0f10800 EBP: f20a3d40 ESP: f20a3d10
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process rm (pid: 11241, ti=f20a2000 task=f207cfb0 task.ti=f20a2000)
Stack: 00000400 c1fb0520 f20a3d24 c01831f5 00000008 00000000 f424ee10 00000000
       f0f10000 f0f10400 05c711f5 00000003 f20a3da8 c026f01c f3f35478 f3f35d00
       f3f351a0 f3f9ee38 00200246 f3f35000 f3eea208 00000031 00000000 00000032
Call Trace:
 [<c01831f5>] ? mark_page_accessed+0x45/0x60
 [<c026f01c>] ? ext2_free_blocks+0x11c/0x320
 [<c026efad>] ? ext2_free_blocks+0xad/0x320
 [<c0272f52>] ? ext2_free_branches+0xc2/0x1a0
 [<c0272fd3>] ? ext2_free_branches+0x143/0x1a0
 [<c014b360>] ? wake_bit_function+0x0/0x60
 [<c01c90d6>] ? __wait_on_buffer+0x26/0x30
 [<c0272fd3>] ? ext2_free_branches+0x143/0x1a0
 [<c0273552>] ? ext2_truncate+0x522/0x5b0
 [<c01c89a4>] ? mark_buffer_dirty+0x44/0x80
 [<c02726db>] ? ext2_update_inode+0x1ab/0x350
 [<c0273f07>] ? ext2_delete_inode+0x87/0x90
 [<c0273e80>] ? ext2_delete_inode+0x0/0x90
 [<c01b9ba1>] ? generic_delete_inode+0x81/0x120
 [<c01b9d67>] ? generic_drop_inode+0x127/0x180
 [<c01b8be7>] ? iput+0x47/0x50
 [<c01af1bc>] ? do_unlinkat+0xec/0x170
 [<c01b185b>] ? vfs_readdir+0x6b/0xa0
 [<c01b1540>] ? filldir64+0x0/0xf0
 [<c0430948>] ? trace_hardirqs_on_thunk+0xc/0x10
 [<c015ad76>] ? trace_hardirqs_on_caller+0x116/0x170
 [<c01af383>] ? sys_unlinkat+0x23/0x50
 [<c010407f>] ? sysenter_past_esp+0x78/0xc5
 =======================
Code: 00 00 00 8b 45 e8 8b 1f 8b 55 e4 8b 88 ac 02 00 00 8b 41 34 0f
af 51 10 03 50 14 89 5d ec 8b 46 18 89 45 f0 89 d8 8b 5d f0 29 d0 <0f>
a3 03 19 c0 85 c0 74 11 8b 47 04 89 45 ec 29 d0 0f a3 03 19
EIP: [<c026ee46>] read_block_bitmap+0xc6/0x180 SS:ESP 0068:f20a3d10
Kernel panic - not syncing: Fatal exception

$ addr2line -e vmlinux -i c026ee46
include/asm/bitops.h:305
fs/ext2/balloc.c:87
fs/ext2/balloc.c:153

Is this one:

        if (!ext2_test_bit(offset, bh->b_data))


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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