On Mi, 04.08.10 21:30 Chris Mason <chris.ma...@oracle.com> wrote: > On Wed, Aug 04, 2010 at 08:48:40PM +0200, Thomas Kuther wrote: > > On Di, 06.07.10 20:16 Chris Mason <chris.ma...@oracle.com> wrote: > > > > > On Sat, Jun 26, 2010 at 03:15:04PM -0700, Yee-Ting Li wrote: > > > > Hi, > > > > > > > > i think my btrfs volume is hosed.... it mounts okay, but iostat > > > > shows /dev/sdg on 100% load. dmesg shows lots of 'parent transid > > > > verify failed on x wanted y found z'. then after a while i can't > > > > read from it (access to the filesystem freezes). > > > > > > > > the machine had crashed (prob from some other process), and upon > > > > reboot i've been experience this problem since. > > > > > > > > can anyone provide any guidance in how to proceed? > > > > > > These are definitely corruptions, and they probably came from the > > > crash. Can you tell me more about the crash? (Power failure, what > > > is the storage underneath etc, what are the write cache > > > settings). We don't expect these kinds corruptions to happen. > > > > > > Yan Zheng is making a lot of progress on btrfsck, but I don't > > > think you'll want to be one of the first testers there. I can > > > definitely help copy things off if you're having trouble > > > accessing the FS. > > > > > > -chris > > > > Hello Chris, > > > > sorry if I'm hijacking this thread. I got a similar problem, > > probably caused by a system crash due to faulty/badly timed memory > > dimms. The system suddenly hardlocked during write activity. > > > > - kernel is 2.6.35 > > - btrfs on top of a md raid5, which looks healthy. Desktop SATA > > disks. > > > > # cat /proc/mdstat|grep -A1 md0 > > md0 : active raid5 sdb1[0] sdd1[1] sdc1[2] > > 2930271872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] > > > > # btrfsck > > usage: btrfsck dev > > Btrfs v0.19-16-g075587c-dirty > > > > # btrfsck /dev/md0 > > parent transid verify failed on 2419218964480 wanted 127839 found > > 127260 parent transid verify failed on 2419218964480 wanted 127839 > > found 127260 parent transid verify failed on 2419218915328 wanted > > 127839 found 127260 parent transid verify failed on 2419218915328 > > wanted 127839 found 127260 parent transid verify failed on > > 2419214266368 wanted 127839 found 127837 parent transid verify > > failed on 2419214266368 wanted 127839 found 127837 parent transid > > verify failed on 2419214266368 wanted 127839 found 127837 > > Segmentation fault > > > > Mount endlessly loops, like explained in this thread. > > > > If there is a way, I would really like some aid copying the data > > off. The backup is quite out of date, shame on me. > > No problem, I'll get a test patch out in the morning. > > -chris >
Hi Chris, did you find the time to get that patch done meanwhile? I'm willing to test. Seems more people get this error after power outages, suspending or similar. Thanks in advance. ~Thomas
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