> > Can you tell if this parallel mode is the default, and if not, what
> > other reasons for a race condition can be?
>
> I am not aware of any "parallel mode" here. The postinst calls dracut
> just with >&2 to redirect stdout to stderr.
I refer to this:
if [[ $parallel != "yes" ]]; then
for i in *; do
[[ -f $i/modules.dep ]] || [[ -f $i/modules.dep.bin ]] || continue
"$dracut_cmd" --kver="$i" "${dracut_args[@]}"
_rc=$?
if [[ $_rc -gt 0 ]]; then
printf "%s\n" "dracut[F]: image generation failed for kernel
'$i'." >&2
((ret += _rc))
fi
done
else
for i in *; do
[[ -f $i/modules.dep ]] || [[ -f $i/modules.dep.bin ]] || continue
--> "$dracut_cmd" --kver="$i" "${dracut_args[@]}" &
done
This "&" at the end is what draw my attention and made me to remember
the funny bug in "sumo" which I pointed out before.
> > I would be willing to build linux-signed-amd64 a lot of times using a
> > modified dracut package with whatever debug changes we could add to
> > see what's going on (even if they are simple "echo foo"), so I'm
> > open for suggestions about those potential changes.
>
> Thanks. Could you try to run a test with this patch applied to dracut:
> https://github.com/dracut-ng/dracut-ng/pull/2109/changes
>
> Plus add an "exit 1" after those 3 dinfo/dwarning calls to let dracut
> fail, because I expect dracut to take the happy path.
This first modified version fails a lot less, maybe because by adding those
additional lines we make the race condition to be less likely.
But I can't see any special thing in the logs (are they redirected somewhere?)
> Can you test with just[*] the stderr redirection to /dev/null removed?
This second modified version fails again quite often, but at least
we can see the error from 3cpio:
[...]
I: /vmlinuz is now a symlink to boot/vmlinuz-6.18.5+deb14-cloud-amd64
I: /initrd.img is now a symlink to boot/initrd.img-6.18.5+deb14-cloud-amd64
/etc/kernel/postinst.d/dracut:
dracut: Generating /boot/initrd.img-6.18.5+deb14-cloud-amd64
thread 'main' panicked at library/std/src/io/stdio.rs:1165:9:
failed printing to stdout: Broken pipe (os error 32)
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
/usr/bin/dracut: line 2772: cpio: command not found
dracut[F]: Creation of /boot/initrd.img-6.18.5+deb14-cloud-amd64 failed
[...]
[*] Note that after cloning from salsa I still have to revert the
change made by Bastian so that it depends again on 3cpio|cpio. The
first time I forgot about such little detail and was suspiciously
surprised that it did not fail at all...
I believe the fact that 3cpio is written in Rust is related to this issue.
I'm going to try this instead and will let you know how it goes:
--- a/dracut.sh
+++ b/dracut.sh
@@ -1483,7 +1483,7 @@ elif [[ -n $persistent_policy && ! -d
"/dev/disk/${persistent_policy}" ]]; then
fi
CPIO=cpio
-if 3cpio --help | grep -q -- --create; then
+if 3cpio --help 2> /dev/null | cat | grep -q -- --create; then
CPIO=3cpio
fi
You can try this for the equivalent simplified example:
if 3cpio --help | cat | true; then true; fi
Thanks.
