Am Freitag, 16. November 2018, 17:44:35 CET schrieb Nikolay Borisov: > On 16.11.18 г. 18:17 ч., Stephan Olbrich wrote: > > Hi, > > > > a few days ago my root file system (simple btrfs on a SSD, no RAID or > > anything) suddenly became read only. Looking at dmsg, I found this: > > > > [ 19.285020] BTRFS error (device sda2): bad tree block start, want > > 705757184 have 82362368 [ 19.285042] BTRFS: error (device sda2) in > > __btrfs_free_extent:6804: errno=-5 IO failure [ 19.285048] BTRFS info > > (device sda2): forced readonly > > [ 19.285051] BTRFS: error (device sda2) in btrfs_run_delayed_refs:2934: > > errno=-5 IO failure [ 19.287213] BTRFS error (device sda2): pending > > csums is 41889792 > > > > Late on I got the same errors for my /home partition (on the same drive) > > as well. I have snapshots of all partitions on another drive made by > > btrbk. To get a working system, I made new (rw) snapshots of the most > > recent backup and setup grub and fstab, so my system would boot from the > > other drive. Unfortunately now I got the "bad tree block start" error > > again at least once in dmesg but I didn't save it and it's not in syslog > > :-( What I remember is, that it was followed by other btrfs error > > messages saying something about correcting something. And the filesystem > > was still read/write this time. > > At the moment I can't reproduce it. > > > > Is there any way to find out, which files are affected by the errors > > above? I don't really trust the data on the drive I'm using at the > > moment, as it has shown errors as well, but I have a less current backup > > on yet another drive but at it is a few weeks old, I don't want to use it > > to setup the system on the SSD again, but just copy the relevant files if > > possible. Or is it possible to repair the original file system? > > > > Some information about my system: > > Kubuntu 18.04 > > Kernel 4.19.1 when the problem occured, now 4.19.2 > > btrfs-tools 4.15.1 > > What is the SMART status of your SSD, how old is the ssd. This really > sounds like the drive going to lalal land.
The SSD is 3.5 years old and was never really full, so I wouldn't expect it to die. SMART shows no errors. All values are way above the threshold and selftests show no errors. I checked RAM as well. No errors there, so I have no clue, where these errors come from. Regards, Stephan
