** Description changed: + SRU Justification: + [Impact] + * Boot failures can occur with the wait-for-root utility in P/Q/R due to a race condition. + * Because of this issue unattended reboots and boots can randomly fail. + * The original bug was submitted against Precise LTS. + + [Test Case] + * Reboot machine and look for "ALERT! /dev/sda1 does not exist. Dropping to a shell!". Entering exit from prompt should boot system normally. + * We expect that continuous reboots should allow for the machine to boot normally without this alert. + + [Regression Potential] + * This patch has already been uploaded into Saucy, and tested. + + -- + Moving the discussion from http://www.spinics.net/lists/hotplug/msg05769.html to launchpad, for I think that this bug needs to be handled in initramfs-tools package rather than in udev package. ---------- I'm experiencing random boot failures with wait-for-root utility in Ubuntu 12.04 ( ubuntu-12.04-server-amd64.iso ) on a HP ProLiant DL360p Gen8 server. For example, wait-for-root waited for only 0.13 seconds before giving up at - FSTYPE=$(wait-for-root "${ROOT}" ${ROOTDELAY:-30}) + FSTYPE=$(wait-for-root "${ROOT}" ${ROOTDELAY:-30}) line in scripts/local in the initramfs, and immediately enters into - panic "ALERT! ${ROOT} does not exist. Dropping to a shell!" + panic "ALERT! ${ROOT} does not exist. Dropping to a shell!" line. This is a race condition and manually entering "exit" from the panic prompt boots the system normally. This is a critical bug for this environment because it will randomly fail to perform unattended reboot (e.g. automatic reboot after saving kdump). ---------- I examined main() in wait-for-root using debug fprintf() and it turned out that udev_monitor_receive_device() is sometimes immediately returning NULL (although wait-for-root is using blocking socket). I examined udev_monitor_receive_device() in libudev.so.0 using debug fprintf() and it turned out that recvmsg() in udev_monitor_receive_device() (which is in libudev-monitor.c in udev package) is returning ENOBUFS error before recvmsg() returns information of the root partition. The wait-for-root utility in initramfs-tools package is not expecting recvmsg() to return ENOBUFS error. But since ENOBUFS is an inevitable error, I think that wait-for-root (i.e. the caller of udev_monitor_receive_device()) should handle this error.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1215911 Title: wait-for-root fails to wait for plain /dev/sdaX partitions. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1215911/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
