https://bugzilla.suse.com/show_bug.cgi?id=1189993 Bug ID: 1189993 Summary: Btrfs hogged one of the CPU cores for more than 30 minutes after a reboot (5.13.12-2-default, 33df9c6) Classification: openSUSE Product: openSUSE Tumbleweed Version: Current Hardware: x86-64 OS: Other Status: NEW Severity: Minor Priority: P5 - None Component: Kernel Assignee: kernel-bugs@opensuse.org Reporter: lpechacek@suse.com QA Contact: qa-bugs@suse.de Found By: --- Blocker: --- Created attachment 852174 --> https://bugzilla.suse.com/attachment.cgi?id=852174&action=edit dmesg, SysRq-L, perf data, lsblk -f, snapper list My CPU fan had a long high-intensity exercise this morning. The root cause turned out to be a kworker thread doing "btrfs_preempt_reclaim_metadata_space". The offending thread identification is "kworker/u16:11". I've collected some data bits (dmesg, SysRq-L, perf data) during the event. It is unclear to me, however, what triggered this long-running FS maintenance and how I could stop it in case I needed to - i.e. if the laptop ran battery or if I sat in a quiet room where the CPU fan disturbance would be unacceptable. -- You are receiving this mail because: You are the assignee for the bug.