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 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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
