Sudo Segfaults with a user who has a pam_mount home directory.

[David Tomaschik]

sudo version: 1.6.9p10-1ubuntu3 (Hardy)
libpam-mount version: 0.32-4

I noticed in dmesg many entries of the form [896132.470717] sudo[23807]: segfault at 00000000 eip 080529ee esp bf8429b0 error 4, always 24 hours apart. I quickly figured that it was from the script /etc/cron.daily/apt, as it invokes sudo 3 times throughout the script. It selects my main user and attempts to run "sudo -u david ...". Attempting to run this as root generates a segmentation fault. Testing this with other user accounts does not generate a segfault.

I then straced the sudo invocation and noticed it was crashing immediately after writing this to the system log:
Sep 9 22:20:11 ozone sudo: pam_mount(pam_mount.c:512) error trying to retrieve authtok from auth code

My home directory is a dm-crypt LVM volume that is mounted (obviously) by pam_mount at login. I believe it is this that causes sudo to crash when attempting to switch to this user.

If there's anything I can do to help debug, please let me know. I've considered trying to rebuild a debug package of sudo and use it with gdb, but I'm not sure if there's a better way. (Is there a general way to get packages with debug symbols?)

[Tom_OConnor (tom-twinhelix)]

This could be related to https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/234727
I've been trying to use sudo-dbgsym to debug this with gdb, but i'm having issues installing the debug packages.