https://bugzilla.suse.com/show_bug.cgi?id=1192714 https://bugzilla.suse.com/show_bug.cgi?id=1192714#c15 --- Comment #15 from Jan Kara <jack@suse.com> --- Thanks for the traces. So in all the cases it seems that struct bfq_group got freed while still being fully linked into various structures. The freeing always happened from blkg_free() called from RCU callback so everything points to the fact that blkg refcount got somehow corrupted (likely someone dropping a ref without taking it). Looking more into this... -- You are receiving this mail because: You are the assignee for the bug.