It’s the second time, @movq@www.uninformativ.de. Not the XFS filesystem driver anymore this time, though. Luckily, with my experience from last time it was rather easy today – once we finally managed to reproduce it. cat /proc/<PID>/{syscall,stack} were absolute key again, thank you very, very much dear Linux kernel hackers for these absolutely wonderful tools! The only tricky part left is figuring out why that actually happens.