9:27 a.m.
On 8/13/19 9:58 AM, Erik Jacobson wrote:
> Okay, so the boot system just runs mount, and then stops. What
commands to
> you run inside the chroot to reproduce the problem? And what are the
> expected and actual results of these commands?
I'm literally just running 'su - erikj' at this point and watching it
not work.
I have a script in our "fat initrd" miniroot that resets the test case
so I can start over quickly without rebooting. It also shows exactly
what its doing:
So the full text is:
bash-4.2# bash reset.sh
+ umount /a
+ umount /root_ro_nfs
+ umount /rootfs.rw
+ mount -o ro,noatime,nocto,actimeo=3600,lookupcache=all,nolock,tcp,vers=3
172.23.255.249:/cm_shared/image/images_ro_nfs/rhel76-aarch64-newkernel /root_ro_nfs
+ mount -t tmpfs -o mpol=interleave tmpfs /rootfs.rw
+ mkdir /rootfs.rw/upperdir
+ mkdir /rootfs.rw/work
+ mount -t overlay overlay -o
lowerdir=/root_ro_nfs,upperdir=/rootfs.rw/upperdir,workdir=/rootfs.rw/work /a
bash-4.2# chroot /a
sh: no job control in this shell
sh-4.2# su - erikj
su: warning: cannot change directory to /home/erikj: Operation not supported
su: failed to execute /bin/bash: Operation not supported
sh-4.2# exit
exit
Okay ,so with this info, I was able to trace through the log and the
pcap, and everything in them work fine. su is found and loaded
(involving finding and loading a lot of libraries, and some login
related stuff like PAM and timezone), and the last thing done in both
the pcap and the log is to look up /home. This succeeds, returning a
file handle and attributes, including a mode of 555. There's no errors
that aren't looking up libraries in the wrong place (it uses the library
path), so it should be fine.
The only thing I can see is that it tries to open /dev/tty and fails.
However, that's very early in the process, and it continues for a long
time after that, so I'm not sure that is causing it to fail. It never
gets to trying to lookup /home/erikj, it just stops at /home.
I'm a bit stumped at this point. Maybe a packet trace of a working run
of the same thing would be helpful for comparison?
Daniel