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
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https://bugs.launchpad.net/bugs/1123220
Title:
cloud-image VM causes kernel panic if image is resized
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https://bugs.launchpad.net/ubuntu/+source/cloud-initramfs-tools/+bug/1123220/+subscriptions
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