http://bugzilla.kernel.org/show_bug.cgi?id=14286
Summary: kernel BUG at fs/ext4/extents.c:2863
Product: File System
Version: 2.5
Kernel Version: 2.6.32-rc1, 2.6.31
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: No
While working with fsfuzz encountered the following kernel stack traces.
Environment: 2.6.32-rc1 and 2.6.31 (kernel BUG at fs/ext4/extents.c:2833)
Architecture: s390
------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2863!
illegal operation: 0001 [#1] SMP
Modules linked in: cbc md5 aes_s390 aes_generic ecb ecryptfs ext4 jbd2 crc16
autofs4 lockd sunrpc ipv6 loop qeth_l2 qeth qdio vmur ccwgroup dm_round_robin
dm_multipath scsi_dh sd_mod scsi_mod multipath dm_snapshot dm_zero dm_mirror
dm_region_hash dm_log dm_mod dasd_fba_mod dasd_eckd_mod dasd_mod ext3 jbd
CPU: 0 Not tainted 2.6.32-rc2 #1
Process fstest (pid: 5755, task: 0000000024a48038, ksp: 0000000011afbe20)
Krnl PSW : 0704000180000000 000003e00200f3f4 (ext4_ext_get_blocks+0x240/0x10cc
[ext4])
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3
Krnl GPRS: 0000000000000000 0000000000000000 0000000000002400 0000000000000000
000000001416c000 000000000c8da000 000000002b539370 0000000000000000
000000002b5390f0 000000002b5390f0 0000000011afba90 000000002b539040
000003e001fe3000 000003e002023198 000003e00200f388 0000000011afb6c8
Krnl Code: 000003e00200f3e8: a71100ff tmll %r1,255
000003e00200f3ec: a7740006 brc 7,3e00200f3f8
000003e00200f3f0: a7f40001 brc 15,3e00200f3f2
>000003e00200f3f4: a7f40000 brc 15,3e00200f3f4
000003e00200f3f8: e3b040100004 lg %r11,16(%r4)
000003e00200f3fe: b90200bb ltgr %r11,%r11
000003e00200f402: a78404ea brc 8,3e00200fdd6
000003e00200f406: 5810b000 l %r1,0(%r11)
Call Trace:
([<000003e00200f388>] ext4_ext_get_blocks+0x1d4/0x10cc [ext4])
[<000003e001fed31e>] ext4_get_blocks+0xba/0x3c0 [ext4]
[<000003e001fee9d8>] ext4_get_block+0xcc/0x114 [ext4]
[<00000000001449ba>] do_mpage_readpage+0x1fa/0x688
[<0000000000144f7a>] mpage_readpages+0xae/0x100
[<00000000000d49f8>] __do_page_cache_readahead+0x160/0x1f4
[<00000000000d4acc>] ra_submit+0x40/0x54
[<00000000000d4f94>] page_cache_sync_readahead+0x40/0x50
[<00000000000cc334>] generic_file_aio_read+0x284/0x6a4
[<000000000010ed34>] do_sync_read+0xd0/0x118
[<000000000010fad0>] vfs_read+0xa8/0x174
[<000000000010fc92>] SyS_read+0x56/0x84
[<0000000000027f5a>] sysc_tracego+0xe/0x14
[<0000004e53f12cc4>] 0x4e53f12cc4
Last Breaking-Event-Address:
[<000003e00200f3f0>] ext4_ext_get_blocks+0x23c/0x10cc [ext4]
---[ end trace 7a3a53bbf5dda9be ]---
Related code:
2858 /*
2859 * consistent leaf must not be empty;
2860 * this situation is possible, though, _during_ tree
modification;
2861 * this is why assert can't be put in ext4_ext_find_extent()
2862 */
2863 BUG_ON(path[depth].p_ext == NULL && depth != 0);
2864 eh = path[depth].p_hdr;
2865
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--- Comment #1 from R.N.Sastry <[email protected]> 2009-10-01 05:47:31 ---
Created an attachment (id=23213)
--> (http://bugzilla.kernel.org/attachment.cgi?id=23213)
fsfuzzer image to recreate the kernel stack trace in tar gzipped format
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--- Comment #2 from R.N.Sastry <[email protected]> 2009-10-01 05:50:50 ---
Created an attachment (id=23214)
--> (http://bugzilla.kernel.org/attachment.cgi?id=23214)
fsfuzzer ext4 base image
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--- Comment #3 from R.N.Sastry <[email protected]> 2009-10-01 05:58:01 ---
unzip the above file(s)
ext4.364.img.tar.gz
ext4.base.tar.gz
And download the fsfuzzer from URL
http://www.risesecurity.org/files/fsfuzzer-0.7.3.tar.gz
Untar it
cd fsfuzzer-0.7.3
./configure
make
cp ext4.364.img to fsfuzzer-0.7.3/cfs
cp ext4.base to fsfuzzer-0.7.3/fs
and run the file named run_test in dir fsfuzzer-0.7.3
./run_test ext4 364
Check the dmesg.
Thanks!!
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--- Comment #4 from R.N.Sastry <[email protected]> 2009-10-16 12:30:09 ---
Any updates!!
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Theodore Tso <[email protected]> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
AssignedTo|[email protected] |[email protected]
|g |
--- Comment #5 from Theodore Tso <[email protected]> 2009-12-14 15:39:32 ---
Created an attachment (id=24181)
--> (http://bugzilla.kernel.org/attachment.cgi?id=24181)
Patch to fix this problem
Surbhi Palande has supplied the following patch to address this issue
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