With btrfs-tools 4.0-2, and kernel 4.2.0-34-generic, I got a kthread pegging up 1 core at 100%, and the whole system was almost completely unusable.
this persisted for several minutes. Then it quieted down, and then the problem reappeared... even after rebooting. I had 2GB of free space. I now freed up a bit more, and I have 30GB... let's see if it'll happen again. While it was happening, I got some perf dump with: sudo perf record -g --proc-map-timeout 100000 -a sleep 10 and I found that most of the time was spent in native_queued_spin_lock_slowpath (name not unexpected, since it's a spin lock), I'll attach the perf.data now (I have 3 of them) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1349711 Title: Machine lockup in btrfs-transaction To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1349711/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
