After a lot of deep digging into the bind mount, loop driver, and buffer
cache and tracking the corrupt pages back down the layers of the stack
we've sanity checked this down to the image. The smoking gun was the
kernel message:
Nov 6 12:15:16 ubuntu-phablet kernel: [3.940485] do_mount:
** Tags added: rtm14
** Package changed: linux (Ubuntu) = system-image (Ubuntu)
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https://bugs.launchpad.net/bugs/1387214
Title:
file corruption on touch images in rw
Made some progress today.
On the phone, I am seeing:
/var/lib/apparmor/profiles/click_com.ubuntu.filemanager_filemanager_0.3.275
containing a pathname and all zeros. The start is always on a page
boundary and the end is always on a page boundary.
I copied the entire partition /dev/mmcblk0p23
The corruption to
/var/lib/apparmor/profiles/click_com.ubuntu.filemanager_filemanager_0.3.275
survives multiple reboots. I'll take another 6GB snapshot of the
underlying partition and see if that's now corrupted.
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After several reboots, the data still appears corrupted on the phone,
but copying the underlying raw device /dev/mmcblk0p23 to my laptop and
loop mounting it and then loop mounting ubuntu.img shows an uncorrupted
var/lib/apparmor/profiles/click_com.ubuntu.filemanager_filemanager_0.3.275.
I'm now
Ruled out the bind mount of /var/lib/apparmor/profiles on /userdata
/system-data/var/lib/apparmor/profiles, still see corruption there on
the device
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Sanity checked the raw data from /dev/mmcblk0p23:
1. copied raw data off the phone to may laptop
2. using sshfs, mounted the directory containing the raw data snapshot back on
the phone
3. loop mounted it
4. loop mounted ubuntu.img from this
5. /ubuntu/var/lib/apparmor/profiles is sane, no
On the phone:
debugfs /userdata/ubuntu.img
cat /var/lib/apparmor/profiles/click_com.ubuntu.filemanager_filemanage
# vim:syntax=apparmor
#include tunables/global
# Define vars with unconfined since autopilot rules may reference them
# Specified profile variables
@{APP_APPNAME}=filemanager
I've searched the entire block device for the string
/usr/share/click/preinstalled/com.ubuntu.music/1.3.625/apparmor.json and
tagged it in such a way as it is obvious it that it has been modified on
the flash drive. I rebooted and double checked - the modified data is
still modified on disk
Added application-confinement and apparmor tags since this bug affects
both and it will be easier to find.
** Description changed:
Symptoms are that cache files in /var/cache/apparmor and profiles in
/var/lib/apparmor/profiles are sometimes corrupted after a reboot. We've
already fixed
** Tags added: kernel-key
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https://bugs.launchpad.net/bugs/1387214
Title:
file corruption on touch images in rw portions of the filesystem
Status in “linux” package in
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