Hello,
I've obtained corrupted xfs log after some sanity xfs testing:
"log=logfile
log_size=855
dd if=/dev/zero "of=$log" bs=4096 count=$log_size
loopdev=$(losetup -f)
losetup $loopdev $log
mkfs.xfs -f -m crc=1 -llogdev=$loopdev,size=${log_size}b $SCRATCH_DEV
mount -t xfs -ologdev=$loopdev $SCRATCH_DEV $SCRATCH_MNT
./fdtree.sh -l 4 -d 4 -C -o $SCRATCH_MNT
sync
umount $SCRATCH_MNT
xfs_logprint -l $loopdev $SCRATCH_DEV"
Test makes crc enabled xfs filesystem with the external log of minimal
allowed size and then creates on this fs the small directory tree
with sub directories and files of fixed depth and size with help of
fdtree utility: https://computing.llnl.gov/?set=code&page=sio_downloads
After that xfs_logprint stably reports bad data in log:
"Oper (307): tid: eec9b0c7 len: 16 clientid: TRANS flags: none
EXTENTS inode data
Oper (308): tid: 41000000 len: 805306368 clientid: ERROR flags: none
LOCAL attr data
============================================================================
cycle: 1 version: 2 lsn: 1,3138 tail_lsn: 1,2
length of Log Record: 32256 prev offset: 3074 num ops: 375
uuid: 39a962b7-4c0d-4e0e-8bcd-39471f93bc1d format: little endian linux
h_size: 32768
----------------------------------------------------------------------------
Oper (0): tid: eec9b0c7 len: 48 clientid: TRANS flags: none
**********************************************************************
* ERROR: data block=3138 *
**********************************************************************
xfs_logprint: unknown log operation type (2e00)
Bad data in log"
Subsequent call to "xfs_repair -n -l $loopdev $SCRATCH_DEV" passes and
filesystem is mounted without errors.
I've supposed the using of inappropriate log size so updated log_size to
default mkfs.xfs value for this device: "log_size=2560".
After that xfs_logprint core dumped with segfault (race condition):
"Feb 11 13:55:42 fedora.fedora kernel: xfs_logprint[14007]: segfault at
29f16768 ip 00000000004028ed sp 00007fff61b46850 error 4 in
xfs_logprint[400000+4e000]"
I have the following configuration on vbox virtual machine with vdi,
fixed size /dev/sdb:
[root@fedora alex]# cat /etc/issue
Fedora release 20 (Heisenbug)
Kernel \r on an \m (\l)
[root@fedora alex]# uname -ir
3.19.0-rc6 x86_64
[root@fedora alex]# mkfs.xfs -V
mkfs.xfs version 3.2.2
[root@fedora alex]# xfs_logprint -V
xfs_logprint version 3.2.2
[root@fedora alex]# fdisk -l /dev/sdb
Disk /dev/sdb: 8 GiB, 8589934592 bytes, 16777216 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
abrt data with sosreport are collected and available on request.
Thanks,
Alexander Tsvetkov
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