[Bug 1381] New: Conntrackd segfaults when committing external caches

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1381

            Bug ID: 1381
           Summary: Conntrackd segfaults when committing external caches
           Product: conntrack-tools
           Version: unspecified
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: conntrack-daemon
          Assignee: netfilter-buglog at lists.netfilter.org
          Reporter: ralf at os-s.de

Hi,
I have a setup based on Ubuntu 18.10 using conntrackd and keepalived for a
ha-firewall. When stress-testing the system by stopping and starting keepalived
eventually the conntrackd segfaults.

Nov 4 15:29:46 host conntrackd[1122]: [Mon Nov 4 15:29:46 2019] (pid=1122)
[notice] committing all external caches
Nov 4 15:29:46 host Keepalived_logscript: user.info GROUP VG11 MASTER 0
Nov 4 15:29:46 host kernel: [20484.383544] show_signal_msg: 7 callbacks
suppressed
Nov 4 15:29:46 host kernel: [20484.383546] conntrackd[1122]: segfault at 10 ip
00005649a5693ab4 sp 00007ffeb5aafec0 error 4 in conntrackd[5649a5688000+34000]

It does not segfault every time. Sometimes it takes 5-10 iterations starting
and stopping the keepalived daemon which will invoke conntrackd to flush the
caches and subsequently segfault.

Kernel: 4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019 x86_64
x86_64 x86_64 GNU/Linux

Conntrackd: 1.4.4+snapshot20161117

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