It seems to me that 'echo hi mom' from the initramfs (or from an upstart job with 'output console') should never result in failure. This is failing in the above situation because the kernel cmdline has 'console=tty1 console=ttyS0' on it, but ttyS0 is not a valid device. So, it seems the following are potential fixes to the issue: a.) kernel doing better sanity checking on console= argument and not attaching /dev/console to something that is going to fail b.) initramfs and upstart verifying that /dev/console can be written to, and if not, then redirecting output to somewhere that *is* writable (possibly /run/ or /dev/null).
Clearly, i could change cloud-initramfs-growroot to not fail when it fails to write to its stdout, but that seems not a general fix. For initramfs, we could do something very early in the initramfs like this: if ! echo "initramfs running" > /dev/console; then read cmdline < /proc/cmdline consoles="" for tok in $cmdline; do [ ${tok#console=} != ${tok} ] || continue; tok=${tok#console=}; tok=${tok%,*}; # reverse order on cmdline consoles="$tok $consoles"; done failed="" found="" for console in $consoles; do dev="/dev/${console#/dev}" echo "initramfs running" > "$dev" && found=$dev && break || failed="${failed:+${failed}$dev}" done if [ -n "$found" ]; then exec > "$found" 2>&1 else exec > "/run/initramfs.log" 2>&1 fi echo "WARN: Failed write to /dev/console${failed:+ and ${failed}}" fi -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1123220 Title: cloud-image VM causes kernel panic if image is resized To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs