On Fri, Jun 09, 2017 at 09:12:16PM +0200, Koen Kooi wrote: > Hi, > > Today the kernel got wedged during shutdown (4.11.x tends to do that, haven't > debugged) and I pressed the reset button. The next boot btrfs won't mount: > > [Fri Jun 9 20:46:07 2017] BTRFS error (device md0): parent transid verify > failed on 5840011722752 wanted 170755 found 170832 > [Fri Jun 9 20:46:07 2017] BTRFS error (device md0): parent transid verify > failed on 5840011722752 wanted 170755 found 170832 > [Fri Jun 9 20:46:07 2017] BTRFS error (device md0): failed to read block > groups: -5 > [Fri Jun 9 20:46:08 2017] BTRFS error (device md0): open_ctree failed
With a transid failure on mount, about the only thing that's likely to work is mounting with -o usebackuproot. If that doesn't work, then a rebuild of the FS is almost certainly needed. Hugo. > I tried repair, but that didn't work either: > > # btrfsck --repair /dev/md0 > enabling repair mode > couldn't open RDWR because of unsupported option features (3). > ERROR: cannot open file system > enabling repair mode > > Googling around it was suggested clearing the v2 space cache: > > # btrfsck --mode=lowmem --clear-space-cache v2 /dev/md0 > parent transid verify failed on 5840011722752 wanted 170755 found 170832 > parent transid verify failed on 5840011722752 wanted 170755 found 170832 > parent transid verify failed on 5840011722752 wanted 170755 found 170832 > parent transid verify failed on 5840011722752 wanted 170755 found 170832 > Ignoring transid failure > leaf parent key incorrect 5840011722752 > parent transid verify failed on 5367057465344 wanted 170755 found 170828 > parent transid verify failed on 5367057465344 wanted 170755 found 170828 > parent transid verify failed on 5367057465344 wanted 170755 found 170828 > parent transid verify failed on 5367057465344 wanted 170755 found 170828 > Ignoring transid failure > leaf parent key incorrect 72105984 > btrfs unable to find ref byte nr 4628577484800 parent 0 root 10 owner 0 > offset 1 > parent transid verify failed on 5366993256448 wanted 170755 found 170827 > parent transid verify failed on 5366993256448 wanted 170755 found 170827 > parent transid verify failed on 5366993256448 wanted 170755 found 170827 > parent transid verify failed on 5366993256448 wanted 170755 found 170827 > Ignoring transid failure > leaf parent key incorrect 41287680 > ERROR: failed to clear free space cache v2: -1 > transaction.h:41: btrfs_start_transaction: BUG_ON `root->commit_root` > triggered, value 22938400 > btrfs check[0x411674] > btrfs check(close_ctree_fs_info+0x125)[0x41368c] > btrfs check(cmd_check+0x36d8)[0x45e8e8] > btrfs check(main+0x15d)[0x40ac5c] > /lib/libc.so.6(__libc_start_main+0xf0)[0x7f9b4cb060d0] > btrfs check[0x40a729] > Clear free space cache v2 > > The underlying md0 (raid6) doesn't report any errors, trying different > kernels makes no difference, 4.10.17, 4.11.4 and 4.12.0-rc4 all give the same > errors. Everything above was > done with btrfs-progs 4.11. > > Any hints on how I can fix the errors in the filesystem? I don't mind loosing > todays changes, but I would like to keep all the older data :) > > regards, > > Koen > -- Hugo Mills | Close enough for government work. hugo@... carfax.org.uk | http://carfax.org.uk/ | PGP: E2AB1DE4 |
signature.asc
Description: Digital signature
