I'll try to reproduce this bug. @joel Sing do you happen to have the reproducer script available?
In parallel, I'll also build a Xenial test kernel with the commit posted by @Haw Loeung in comment 4 ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Xenial) Importance: Undecided => High ** Changed in: linux (Ubuntu Xenial) Assignee: (unassigned) => Joseph Salisbury (jsalisbury) ** Changed in: linux (Ubuntu Xenial) Status: New => Triaged ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged ** Changed in: linux (Ubuntu) Importance: High => Critical ** Changed in: linux (Ubuntu Xenial) Importance: High => Critical ** Tags added: kernel-key -- You received this bug notification because you are a member of नेपाली भाषा समायोजकहरुको समूह, which is subscribed to Xenial. Matching subscriptions: Ubuntu 16.04 Bugs https://bugs.launchpad.net/bugs/1793753 Title: kernel panic - null pointer dereference on ipset operations Status in linux package in Ubuntu: Triaged Status in linux source package in Xenial: Triaged Bug description: Hi, We've experienced crashes on machines running iptables using ipsets. We could get a trace from the console on one of them (attached file kernel-trace.txt). On these machines, some ipset commands are automatically run to update the sets, and/or to dump them (ipset restore, swap, delete ... / ipset save). We strongly suspect the panic is happening due to a race when ipset updates happen at the same time as a dump. These machines are running xenial. Before the crash, they were on 4.4.0-116-generic #140-Ubuntu, but then rebooted into 4.4.0-135-generic #161-Ubuntu. I have an ipset save running in loops on one of these machines to try and reproduce quicker. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1793753/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~group.of.nepali.translators Post to : group.of.nepali.translators@lists.launchpad.net Unsubscribe : https://launchpad.net/~group.of.nepali.translators More help : https://help.launchpad.net/ListHelp