group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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

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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.

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