At last - a quick reproducer. This 15 line script oopses my kernel every time.
The cause then appears to be the removal of the qemu-nbd device before it has been unmounted. I don't know if qemu-nbd is supposed to know that it shouldn't allow itself to be removed while mounted, or whether the kernel should be returning -EBUSY somewhere. I don't know that "just don't do that" is a sufficient answer here. ** Also affects: qemu-kvm (Ubuntu) Importance: Undecided Status: New ** Attachment added: "qemu-nbd-oops.sh" https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/861656/+attachment/2488851/+files/qemu-nbd-oops.sh ** Summary changed: - many ext4 errors + Kernel oops when nbd device is removed before it is unmounted -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/861656 Title: Kernel oops when nbd device is removed before it is unmounted To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/861656/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs