It seems one of the RAM modules in that machine degraded over time - while memtest86 found no problems in the past, now errors are discovered within seconds.
It's unclear when the module became faulty, but it's quite plausible that the observed kernel panics were caused by this and that there's no actual software bug involved. I'll replace the system RAM and revert back to the normal Ubuntu kernel. I think this issue can be closed - if the same symptoms reassert themselves, things can be revisited. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1779063 Title: Occasional kernel panic on shutdown in ext4 code (dquot_drop) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1779063/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
