Comment # 4 on bug 1011529 from
(In reply to Michel Normand from comment #3)
> [CUT]
> 
> I would need help to continue investigation.

if I try to chroot to /mnt and kill hung ofpathname then parent is making
cleanup that umount, so unable to manually call ofpathname to better understand
original hung failure.
===
2:linux-ac6f:~ # chroot /mnt
linux-ac6f:/ # ps axf
...
17473 pts/0    S+     0:00  |                       \_ /usr/sbin/grub2-install
--target=powerpc-ieee1275 --force --skip-fs-probe
/dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_mpath1-part1
17489 pts/0    S+     0:00  |                           \_ /bin/bash
/usr/sbin/ofpathname /dev/mapper/0QEMU_QEMU_HARDDISK_mpath1
17505 pts/0    S+     1:38  |                               \_ /bin/bash
/usr/sbin/ofpathname /dev/mapper/0QEMU_QEMU_HARDDISK_mpath1
...
linux-ac6f:/ # kill -9 17505
linux-ac6f:/ # ls /usr/sbin/ofpathname
/usr/sbin/ofpathname

linux-ac6f:/ # /bin/bash /usr/sbin/ofpathname
/dev/mapper/0QEMU_QEMU_HARDDISK_mpath1
sed: can't read /proc/cpuinfo: No such file or directory
grep: /proc/cpuinfo: No such file or directory
grep: /proc/cpuinfo: No such file or directory
grep: /proc/cpuinfo: No such file or directory
/usr/bin/find: '/sys/class/net': No such file or directory
ofpathname: Could not retrieve Open Firmware device path
            for logical device "/dev/mapper/0QEMU_QEMU_HARDDISK_mpath1".
===


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