On 2019/6/25 上午5:19, Chris Murphy wrote: > Short version: > sysroot is Btrfs. I made a rw snapshot of an ro snapshot in order to > do a rollback, and then rebooted. The umount was clean, but during > startup I noticed many services had failed, but couldn't tell why and > I had no shell or remote service to get into the system. I don't know > if a rw mount happened, journald is set to volatile journal so there's > no log of this failed boot. I waited about 5 minutes in this state > then forced a poweroff, rebooted from USB stick and btrfs check finds > errors and collect information. There are many btrfs check errors in > lowmem mode. It does mount ro without complaint using kernel 5.0.7.
The errors from lowmem and original mode are matching each other. Just lowmem mode prints every missing csum it hits while original mode report in an inode basis. The problem is not complex, one inode which shouldn't go through compression (maybe nodatacow or nodatasum set) has go through compression. This leads to missing csum while still compressed. This could cause read time error. The solution should be pretty easy, find inode 4665463 in root 492, and remove it. But before deleting it, would you please provide the filename and the following output? # btrfs ins dump-tree -t 492 | grep -C20 "4665463 INODE_ITEM" Normally we shouldn't have any nodatacow/nodatasum inode goes through compression, maybe zstd compression code doesn't follow that rule? Thanks, Qu > > This system has used Btrfs for years with zero corruptions until now. > This system was clean installed with Fedora Rawhide ~ 2 weeks ago, > with a newly created file system. > > Hardware: > Apple Macbook Pro (2011) > Samsung SSD 840 EVO 250GB, Firmware Version: EXT0DB6Q > > Detail version: > only btrfs-progs 5.1 used > mix of kernel 5.2rc2, rc3, and rc5, at the time of the snapshot and > reboot with scary failures, it was using rc5+, specifically git > bed3c0d84e7e > > mkfs.btrfs -d single -m single -n 32K /dev/sda6 > mount options: noatime,ssd,space_cache=v2,compress=zstd > > btrfs check (normal) > https://drive.google.com/open?id=1ZkIPq01lz1BxjOjxA22SUh0kSQaEeRex > btrfs check lowmem > https://drive.google.com/open?id=11INxc1OQbdpmqrVRlk0mNuLwmgSnnB1K > btrfs super > https://drive.google.com/open?id=13cNGSvjPTiYgG0smEFWecP3fk9P2Tn5G > btrfs debug tree, 97MB zstd compressed > https://drive.google.com/open?id=1TaxKikn9gKDjnkQpOrqWzdGYw17maCpt > btrfs image, 31MB > https://drive.google.com/open?id=1is_prjUhu8IBjq9oadugOi_YBYbGYGRA > >
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