On 2018年04月21日 22:55, Dmitrii Tcvetkov wrote: > TL;DR It seems as regression in 4.17, but I managed to find a > workaround to make filesystem rw mountable again. > > Kernel built from tag v4.17-rc1 > btrfs-progs 4.16 > > Tonight two my machines (PC (ECC RAM) and laptop(non-ECC RAM)) were > doing usual weekly balance with this command via cron: > btrfs balance start -musage=50 -dusage=50 <mountpoint> > Both machines run same kernel version. > > On PC that caused root and "data" filesystems to go readonly. Root is on > an SSD with data single and metadata DUP, "data" filesystem is on 2 HDDs > with RAID1 for data and metadata. > > On laptop only /home went ro, it's on NVMe SSD with data single and > metadata DUP. > > Btrfs check of PC rootfs was without any errors in both modes, I did > them once each before reboot on readonly filesystem with --force flag > and then from live usb. Same output without any errors. > > After reboot kernel refused rw mount rootfs with the same error as > during cron balance, ro mount was accepted, error during rw mount: > BTRFS: error (device dm-17) in merge_reloc_roots:2465: errno=-117
117 means EUCLEAN, which could be caused by the newly introduced first_key and level check. Please apply this hotfix to fix it. btrfs: Only check first key for committed tree blocks (Which is included in latest pull request) Also, please consider enable CONFIG_BTRFS_DEBUG to provide extra debug info. Thanks, Qu > unknown BTRFS info (device dm-17): forced readonly BTRFS info (device > dm-17): delayed_refs has NO entry BTRFS error (device dm-17): cleaner > transaction attach returned -3 > > mount rw with skip_balance parameter didn't help to mount. > > After that I mounted rw the rootfs with 4.16.2 kernel, mount was > successful and kernel finished balance. After that the filesystem is > mountable rw by 4.17-rc1 kernel without errors, btrfs check is clean > too. > > Data filesystem behaves the same, rw mount on 4.17-rc1 kernel yields: > [ 2321.370113] BTRFS: error (device dm-17) in merge_reloc_roots:2465: > errno=-117 unknown [ 2321.370119] BTRFS warning (device dm-17): failed > to recover relocation: -30 [ 2321.370137] BTRFS info (device dm-17): > delayed_refs has NO entry [ 2321.370155] BTRFS error (device dm-17): > cleaner transaction attach returned -30 [ 2321.414219] BTRFS error > (device dm-17): open_ctree failed > > Rw mount on 4.16.2 goes ok and after balance finishes the filesystem is > mountable by 4.17-rc1 again. I saved /home filesystem from laptop in > unmountable by 4.17-rc1 state and can test patches and/or create > btrfs-image if it's needed. >
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