Jonáš Vidra wrote:
Hello!
Hello.
I found a bug in fsck.reiser4 from reiser4progs-1.0.7. It segfaults
when I try to check my storage partition.
The FS is currently mounted read-only, as I need the data and I don't
have a spare disk.
I haven't noticed any other problems so far, the fsck was just a
weekly check.
I recompiled reiser4progs with debug statements and made a backtrace,
but I'm not skilled in these things, so let me know if additional info
is needed.
I've also packed the filesystem metadata, I can post them somewhere if
you want.
Packed metadata won't help in this case.
The most efficient way is to provide me with a root access to your machine.
You have encountered a rare case of corruption, and it is important to
fix this
fsck bug properly.
By the way, how do I find a filename by node number or key?
find - inum 64881
Debugfs allows me to search for nodes when I type a filename, but not
vice versa.
I'd like to know which file caused the corruption.
What do you want to do with this file?
Thanks,
Edward.
The output from GDB is below.
(gdb) run
Starting program: /sbin/fsck.reiser4 /dev/sda7
*******************************************************************
This is an EXPERIMENTAL version of fsck.reiser4. Read README first.
*******************************************************************
Fscking the /dev/sda7 block device.
Will check the consistency of the Reiser4 SuperBlock.
Will check the consistency of the Reiser4 FileSystem.
Continue?
(Yes/No): y
***** fsck.reiser4 started at Tue Mar 23 16:32:33 2010
Reiser4 fs was detected on /dev/sda7.
Master super block (16):
magic: ReIsEr4
blksize: 4096
format: 0x0 (format40)
uuid: 7e3c26ff-e382-4f6f-9686-ca06ff31c615
label: data
Format super block (17):
plugin: format40
description: Disk-format plugin.
version: 0
magic: ReIsEr40FoRmAt
mkfs id: 0x7c89491a
flushes: 0
blocks: 47640736
free blocks: 9067517
root block: 36345512
tail policy: 0x2 (smart)
next oid: 0x64883
file count: 6842
tree height: 5
key policy: LARGE
CHECKING THE STORAGE TREE
Read nodes 3394397
Nodes left in the tree 3394397
Leaves of them 3354276, Twigs of them 39373
Time interval: Tue Mar 23 16:32:53 2010 - Tue Mar 23 16:46:58
2010
CHECKING EXTENT REGIONS.
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (31), unit (7), [64744:4(FB):4d4f563042422e:6487d:0]: points to
the already used blocks, region [38491215..38497535].
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (35), unit (0), [64744:4(FB):4d4f563042442e:64881:0]: points to
the already used blocks, region [32036064..32036064].
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (35), unit (1), [64744:4(FB):4d4f563042442e:64881:0]: points to
the already used blocks, region [36296457..36296457].
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (35), unit (2), [64744:4(FB):4d4f563042442e:64881:0]: points to
the already used blocks, region [36345512..36345512].
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (35), unit (3), [64744:4(FB):4d4f563042442e:64881:0]: points to
the already used blocks, region [36425556..36425556].
FSCK: extent40_repair.c: 96: extent40_check_layout: Node (36296453),
item (35), unit (4), [64744:4(FB):4d4f563042442e:64881:0]: points to
the already used blocks, region [38293910..38293910].
Read twigs 39373
Invaid extent pointers 6
Time interval: Tue Mar 23 16:46:58 2010 - Tue Mar 23 16:50:25
2010
CHECKING THE SEMANTIC TREE
FSCK: ccreg40_repair.c: 77: ccreg40_check_item: The file
[64744:4d4f563042442e:64882] (ccreg40), node [38551031], item [0]:
item of the wrong cluster size (-2147483648) found, Should be (65536).
Program received signal SIGSEGV, Segmentation fault.
0xb7f6f7d2 in aux_adler32 (adler=<value optimized out>,
buff=0xbffe22ca "", n=4294839597) at aux.c:194
(gdb) bt
#0 0xb7f6f7d2 in aux_adler32 (adler=<value optimized out>,
buff=0xbffe22ca "", n=4294839597) at aux.c:194
#1 0xb7f9ceb2 in ccreg40_check_crc (cc=0x8edf5f0, func=0,
data=0xbfffeb1c, mode=1 '\001') at ccreg40_repair.c:130
#2 ccreg40_check_cluster (cc=0x8edf5f0, func=0, data=0xbfffeb1c,
mode=1 '\001') at ccreg40_repair.c:174
#3 ccreg40_check_struct (cc=0x8edf5f0, func=0, data=0xbfffeb1c,
mode=1 '\001') at ccreg40_repair.c:271
#4 0xb7f34a4a in repair_object_check_struct (object=0x8edf5f0,
place_func=0, mode=<value optimized out>, data=0xbfffeb1c) at object.c:19
#5 0xb7f391ab in repair_semantic_check_struct (sem=0xbfffeb1c,
object=0x8edf5f0) at semantic.c:68
#6 0xb7f3ae26 in cb_object_traverse (parent=0x8e5ef40,
entry=0xbfff4410, data=0xbfffeb1c) at semantic.c:352
#7 0xb7f6791d in reiser4_object_traverse (object=0x8e5ef40,
open_func=0xb7f3abb7 <cb_object_traverse>, data=0xbfffeb1c) at
object.c:723
#8 0xb7f67959 in reiser4_object_traverse (object=0x8e614a0,
open_func=0xb7f3abb7 <cb_object_traverse>, data=0xbfffeb1c) at
object.c:731
#9 0xb7f67959 in reiser4_object_traverse (object=0x8e5baf0,
open_func=0xb7f3abb7 <cb_object_traverse>, data=0xbfffeb1c) at
object.c:731
#10 0xb7f67959 in reiser4_object_traverse (object=0x8e479e0,
open_func=0xb7f3abb7 <cb_object_traverse>, data=0xbfffeb1c) at
object.c:731
#11 0xb7f67959 in reiser4_object_traverse (object=0x80628e0,
open_func=0xb7f3abb7 <cb_object_traverse>, data=0xbfffeb1c) at
object.c:731
#12 0xb7f3a202 in repair_semantic (sem=0xbfffeb1c) at semantic.c:845
#13 0xb7f3cee8 in repair_check (repair=0xbfffee04) at repair.c:799
#14 0x0804b242 in main (argc=2, argv=Cannot access memory at address
0x8608
) at fsck.c:566
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