group.of.nepali.translators team mailing list archive

[Heikki Hannikainen <1883498@xxxxxxxxxxxxxxxxxx>]

4.4.0-186 is already released. Both 4.4.0-185 and 4.4.0-186 contain the
fix for this issue and work fine for me, no crashes observed.

** Changed in: linux (Ubuntu Xenial)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1883498

Title:
  Frequent Panic in ip6_expire_frag_queue->icmpv6_send on
  4.4.0-184-generic

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Fix Released

Bug description:
  I happened to do an upgrade on a number of servers last week. Some of
  them got 4.4.0-179-generic and the ones upgraded a bit later during
  the week got 4.4.0-184-generic as it was just released. The ones with
  4.4.0-184-generic started getting stuck. With linux-crashdump
  installed I obtained the dmesgs and crash dumps. The backtrace appears
  somewhat similar to #202669 but that one only happened on bare
  hardware for us - this one is on KVM virtual instances. #202669
  paniced in icmpv6_route_lookup and this one dies already in
  icmpv6_send.

  Between 2020-06-11 and 2020-06-15, on a set of 12 VMs running
  4.4.0-184-generic, there were 85 crashes like this, on servers with
  noticeable IPv6 traffic. All of the 12 VMs with 4.4.0-184-generic
  crashed at least once. (There are more than 12 VMs experiencing this,
  this is just the set I had linux-crashdump on.)

  [57063.487084] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
  [57063.487184] IP: [<ffffffff818288ab>] icmp6_send+0x1fb/0x970
  [57063.487218] PGD 0 
  [57063.487231] Oops: 0000 [#1] SMP 
  [57063.488665] Call Trace:
  [57063.488679]  <IRQ> 
  [57063.488705]  [<ffffffff81756ee8>] ? __netif_receive_skb+0x18/0x60
  [57063.488739]  [<ffffffff810c3758>] ? task_tick_fair+0x4c8/0x8e0
  [57063.488771]  [<ffffffff81868280>] ? _raw_spin_unlock_bh+0x20/0x50
  [57063.488802]  [<ffffffff81841ed1>] icmpv6_send+0x21/0x30
  [57063.488829]  [<ffffffff8182fe95>] ip6_expire_frag_queue+0x115/0x1b0
  [57063.488862]  [<ffffffffc0366260>] ? nf_ct_net_exit+0x50/0x50 [nf_defrag_ipv6]
  [57063.488897]  [<ffffffffc036627f>] nf_ct_frag6_expire+0x1f/0x30 [nf_defrag_ipv6]
  [57063.488937]  [<ffffffff810f57c7>] call_timer_fn+0x37/0x140
  [57063.488965]  [<ffffffffc0366260>] ? nf_ct_net_exit+0x50/0x50 [nf_defrag_ipv6]
  [57063.489002]  [<ffffffff810f70d4>] run_timer_softirq+0x234/0x330
  ...

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