Dear Qu, thanks for your reply.
On 09/25/2017 12:19 PM, Qu Wenruo wrote as excerpted: > Even no dmesg output using tty or netconsole? And thanks for the pointer to netconsole, I tried that one. No success. I set netconsole up, verified it worked, started a scrub, the machine went away after a couple of hours, netconsole empty. > That's strange. > Normally it should be kernel BUG_ON() to cause such problem. > > And if the system is still responsible (either from TTY or ssh), is > there anything strange like tons of IO or CPU usage? I can't tell, the machine just disappears from the network. Dead. IIRC, it was also all dead when I sat in front of it. > Btrfs-progs v4.13 should have fixed it. > As long as v4.13 btrfs check reports no error, its metadata should be > good. I can try that one, if helpful. > You could try the out-of-tree offline scrub to do a full scrub of your > fs unmounted, so it won't crash your system (if nothing wrong happened) > https://github.com/gujx2017/btrfs-progs/tree/offline_scrub Did that, machine crashed again. >> MIXED_BACKREF, BIG_METADATA, EXTENDED_IREF, SKINNY_METADATA, NO_HOLES > > Only NO_HOLES is not ordinary, but shouldn't cause a problem. Would it be sensible to turn that feature off using `btrfstune` (if possible at all)? > Without kernel backtrace, it's tricky to locate the problem. > So I would recommend to use netconsole (IIRC more reliable, as I use it > on my test VM to capture the dying message) or TTY output to verify > there is no kernel message/backtrace. Yeah I see we are in a tricky situation here. I will try to scrub with autodefrag and compression deactivated. Could a full balance be of any help? At least to find out if it crashes the machine as well? Cheers, Lukas > Thanks, > Qu > >> no quotas in use >> see also https://pastebin.com/4me6zDsN for more details >> btrfs-progs v4.12 >> GNU/Linux 4.12.0-0.bpo.1-amd64 #1 SMP Debian 4.12.6-1~bpo9+1 x86_64 >> >> The question, obviously, is how can I make this fs "scrubable" again? >> Are the errors found by btrfsck safe to repair using btrfsck or some >> other tool? >> >> Thank you so much in advance, >> >> Lukas >> -- >> 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 >> -- 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
