Public bug reported: 1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
lsb_release -rd Description: Ubuntu 18.04.4 LTS Release: 18.04 2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in apt-cache policy libpam-google-authenticator libpam-google-authenticator: Installed: 20170702-1 Candidate: 20170702-1 Version table: *** 20170702-1 500 500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages 100 /var/lib/dpkg/status 3) What you expected to happen Didn't expect a Kernel reboot, just an error message 4) What happened instead server crashed https://errors.ubuntu.com/user/58ef3f64f201a5f60a086141e3751b91a710dbf811d9f5824ebe26eab6c42e229a24677e6c0b1ea5361c25158042dbfa77fd3a3c0bedd28377dfe9f43d91eca8 There is a bug that will cause a ubuntu to crash from bad configuration of libpam-google-authenticator on 4.15.0-109-generic #110-Ubuntu SMP Tue Jun 23 02:39:32 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux. kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 -- Reboot -- Steps to reproduce : • sudo apt-get update • sudo apt-get install libpam-google-authenticator • vi /etc/pam.d/sshd add below line without nullok auth required pam_google_authenticator.so Then restart ssh, • sudo systemctl restart sshd.service without initializing / running google-authenticator for ssh user. • ssh -l user yourUbuntuServer.com Work around is to add nullok to end of pam.d/sshd line ** Affects: google-authenticator (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886284 Title: libpam-google-authenticator, kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/google-authenticator/+bug/1886284/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs