look into the code, u can also see the fault posted debug log above:
when using a USB HDD(/dev/sdb) partition /cdrom(/dev/sdb1 vfat) casper-
rw(/dev/sdb2 ext2)
1. mount /dev/sdb1 /cdrom (/casper is exist(will load filesystem.squashfs
lately))
2. find casper-rw(file and partition in same time(cause bug))
casper.setup_unionfs-> casper-helper.find_cow_device
for each /dev/sdb*
a. find file
a.1 /dev/sdb* not mounted(mount /dev/sdb* to /casper-rw-backing)
a.2 /dev/sdb1 mounted(remount -rw on /cdrom)
then check the casper-rw file's existence
***after check(not exist), it will umount the /dev/sdb*, for /cdrom
will be umounted, here is bug ***
b. find partition just check LABEL = casper-rw
in order of /dev/sdb1 /dev/sdb2, so /cdrom be umounted
workaround may be:
1. put casper-rw(/dev/sdb1) before /cdrom(/dev/sdb2) partition
2. or modify find_cow_device, 1st find partiton, 2nd find file(don't do in
the same time)
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https://bugs.launchpad.net/bugs/1489855
Title:
Change to mount sequence order breaks persistence on casper-rw
partitions
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https://bugs.launchpad.net/ubuntu/+source/casper/+bug/1489855/+subscriptions
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