Thanks to Doug's addition info, I think I managed to track down this problem after creating a new user to test. When clicking the username in lightdm-example-gtk-greeter, start_authentication() is executed in lightdm-example-gtk-greeter.c. If the user is anything but "Other" or "Guest", the greeter attempts to load the user's ~/.dmrc file to look up the default session. Since this user has never logged in, there is no ~/.dmrc file, so the session name is NULL. This NULL session is then passed to set_session() in lightdm-example-gtk-greeter.c, which attempts to compare the name with all the available session using strcmp, which crashes because session is NULL. Could probably use g_strcmp0, but I think the better option is just to add a g_return_if_fail (session != NULL) to the start of the file. I rebuilt with this patch, and haven't been able to crash it in the same way since.
** Patch added: "check_for_null_session.patch" https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/809890/+attachment/2212010/+files/check_for_null_session.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/809890 Title: lightdm-example-gtk-greeter crashed with SIGSEGV in __strcmp_ssse3() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/809890/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
