Public bug reported:

Got a host running lots of virtual machines crashing today with the
following terminal output (if that's to any help):

[3430458.298979] divide error: 0000 [#1] SMP PTI
[3430458.304484] Modules linked in: cpuid vhost_net vhost tap nf_conntrack_ipv6 
nf_defrag_ipv6 xt_physdev br_netfilter ip_set nfnetlink kvm_intel kvm irqbypass 
rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace sunrpc cachefiles fscache 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack 
ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge ebtable_filter ebtables 
ip6table_filter ip6_tables devlink iptable_filter 8021q garp mrp stp llc 
bonding ipmi_ssif intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp 
coretemp dcdbas intel_cstate intel_rapl_perf ipmi_si mei_me ipmi_devintf 
lpc_ich mei shpchp ipmi_msghandler acpi_power_meter mac_hid sch_fq_codel 
ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi
[3430458.389747]  scsi_transport_iscsi ip_tables x_tables autofs4 btrfs 
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor 
async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul mgag200 
crc32_pclmul i2c_algo_bit ghash_clmulni_intel ttm pcbc mxm_wmi drm_kms_helper 
bnx2x aesni_intel syscopyarea sysfillrect aes_x86_64 sysimgblt fb_sys_fops 
crypto_simd glue_helper ptp cryptd drm pps_core ahci mdio libahci libcrc32c wmi 
[last unloaded: irqbypass]
[3430458.440756] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-43-generic 
#46-Ubuntu
[3430458.450411] Hardware name: Dell Inc. PowerEdge R430/0CN7X8, BIOS 2.7.1 
01/26/2018
[3430458.460008] RIP: 0010:update_group_capacity+0x19d/0x1f0
[3430458.467098] RSP: 0018:ffff91043ec03bd8 EFLAGS: 00010247
[3430458.474207] RAX: 00000000006314d6 RBX: 0000000000000001 RCX: 
000000000000024d
[3430458.483490] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000022880
[3430458.492769] RBP: ffff91043ec03c00 R08: ffff9104376dc940 R09: 
000000001dcd6500
[3430458.502071] R10: ffff91043ec00000 R11: 0000000000000001 R12: 
ffff910437625000
[3430458.511391] R13: ffff9104376dc940 R14: 0000000000000000 R15: 
ffff91043ec03c30
[3430458.520724] FS:  0000000000000000(0000) GS:ffff91043ec00000(0000) 
knlGS:0000000000000000
[3430458.531161] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[3430458.538994] CR2: 000000010960b008 CR3: 0000003f8300a002 CR4: 
00000000003626e0
[3430458.548416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[3430458.557858] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[3430458.567298] Call Trace:
[3430458.571507]  <IRQ>
[3430458.575253]  find_busiest_group+0xff/0x9c0
[3430458.581327]  load_balance+0x164/0x9c0
[3430458.586928]  ? sched_clock+0x9/0x10
[3430458.592347]  ? sched_clock_cpu+0x11/0xb0
[3430458.598249]  rebalance_domains+0x245/0x2d0
[3430458.604372]  run_rebalance_domains+0x139/0x1f0
[3430458.610901]  __do_softirq+0xe4/0x2bb
[3430458.616459]  irq_exit+0xb8/0xc0
[3430458.621538]  scheduler_ipi+0xea/0x130
[3430458.627201]  smp_reschedule_interrupt+0x39/0xe0
[3430458.633860]  reschedule_interrupt+0x84/0x90
[3430458.640138]  </IRQ>
[3430458.644096] RIP: 0010:cpuidle_enter_state+0xa7/0x2f0
[3430458.651289] RSP: 0018:ffffa90100107e68 EFLAGS: 00000246 ORIG_RAX: 
ffffffffffffff02
[3430458.661431] RAX: ffff91043ec22880 RBX: 000c2ffbd05252a7 RCX: 
000000000000001f
[3430458.671114] RDX: 000c2ffbd05252a7 RSI: ffffff1e5f04e459 RDI: 
0000000000000000
[3430458.680819] RBP: ffffa90100107ea8 R08: 00000000ffffffff R09: 
0000000000000d17
[3430458.690557] R10: ffffa90100107e38 R11: 0000000000000eca R12: 
ffffc900ff401f58
[3430458.700303] R13: 0000000000000004 R14: ffffffff9bb71d18 R15: 
0000000000000000
[3430458.710075]  ? cpuidle_enter_state+0x97/0x2f0
[3430458.716723]  cpuidle_enter+0x17/0x20
[3430458.722455]  call_cpuidle+0x23/0x40
[3430458.728041]  do_idle+0x18c/0x1f0
[3430458.733312]  cpu_startup_entry+0x73/0x80
[3430458.739293]  start_secondary+0x1ab/0x200
[3430458.745229]  secondary_startup_64+0xa5/0xb0
[3430458.751415] Code: 34 10 48 8b 96 38 0a 00 00 48 8b 86 30 0a 00 00 48 8b b6 
a0 09 00 00 49 d1 e9 48 29 d6 ba 00 00 00 00 48 0f 48 f2 31 d2 44 01 ce <48> f7 
f6 48 3d ff 03 00 00 77 0c ba 00 04 00 00 48 29 c2 48 0f
[3430458.775397] RIP: update_group_capacity+0x19d/0x1f0 RSP: ffff91043ec03bd8
[3430458.784442] ---[ end trace c1ae6368b9740f8a ]---
[3430458.866540] Kernel panic - not syncing: Fatal exception in interrupt
[3430458.866591] Kernel Offset: 0x19600000 from 0xffffffff81000000 (relocation 
range: 0xffffffff80000000-0xffffffffbfffffff)
[3430458.954898] ---[ end Kernel panic - not syncing: Fatal exception in 
interrupt

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1814628

Title:
  divide error: 0000 with Ubuntu 18.04

Status in linux package in Ubuntu:
  New

Bug description:
  Got a host running lots of virtual machines crashing today with the
  following terminal output (if that's to any help):

  [3430458.298979] divide error: 0000 [#1] SMP PTI
  [3430458.304484] Modules linked in: cpuid vhost_net vhost tap 
nf_conntrack_ipv6 nf_defrag_ipv6 xt_physdev br_netfilter ip_set nfnetlink 
kvm_intel kvm irqbypass rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace 
sunrpc cachefiles fscache xt_CHECKSUM iptable_mangle ipt_MASQUERADE 
nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 
nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp 
bridge ebtable_filter ebtables ip6table_filter ip6_tables devlink 
iptable_filter 8021q garp mrp stp llc bonding ipmi_ssif intel_rapl sb_edac 
x86_pkg_temp_thermal intel_powerclamp coretemp dcdbas intel_cstate 
intel_rapl_perf ipmi_si mei_me ipmi_devintf lpc_ich mei shpchp ipmi_msghandler 
acpi_power_meter mac_hid sch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core 
iscsi_tcp libiscsi_tcp libiscsi
  [3430458.389747]  scsi_transport_iscsi ip_tables x_tables autofs4 btrfs 
zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor 
async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul mgag200 
crc32_pclmul i2c_algo_bit ghash_clmulni_intel ttm pcbc mxm_wmi drm_kms_helper 
bnx2x aesni_intel syscopyarea sysfillrect aes_x86_64 sysimgblt fb_sys_fops 
crypto_simd glue_helper ptp cryptd drm pps_core ahci mdio libahci libcrc32c wmi 
[last unloaded: irqbypass]
  [3430458.440756] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-43-generic 
#46-Ubuntu
  [3430458.450411] Hardware name: Dell Inc. PowerEdge R430/0CN7X8, BIOS 2.7.1 
01/26/2018
  [3430458.460008] RIP: 0010:update_group_capacity+0x19d/0x1f0
  [3430458.467098] RSP: 0018:ffff91043ec03bd8 EFLAGS: 00010247
  [3430458.474207] RAX: 00000000006314d6 RBX: 0000000000000001 RCX: 
000000000000024d
  [3430458.483490] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
0000000000022880
  [3430458.492769] RBP: ffff91043ec03c00 R08: ffff9104376dc940 R09: 
000000001dcd6500
  [3430458.502071] R10: ffff91043ec00000 R11: 0000000000000001 R12: 
ffff910437625000
  [3430458.511391] R13: ffff9104376dc940 R14: 0000000000000000 R15: 
ffff91043ec03c30
  [3430458.520724] FS:  0000000000000000(0000) GS:ffff91043ec00000(0000) 
knlGS:0000000000000000
  [3430458.531161] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [3430458.538994] CR2: 000000010960b008 CR3: 0000003f8300a002 CR4: 
00000000003626e0
  [3430458.548416] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
  [3430458.557858] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
  [3430458.567298] Call Trace:
  [3430458.571507]  <IRQ>
  [3430458.575253]  find_busiest_group+0xff/0x9c0
  [3430458.581327]  load_balance+0x164/0x9c0
  [3430458.586928]  ? sched_clock+0x9/0x10
  [3430458.592347]  ? sched_clock_cpu+0x11/0xb0
  [3430458.598249]  rebalance_domains+0x245/0x2d0
  [3430458.604372]  run_rebalance_domains+0x139/0x1f0
  [3430458.610901]  __do_softirq+0xe4/0x2bb
  [3430458.616459]  irq_exit+0xb8/0xc0
  [3430458.621538]  scheduler_ipi+0xea/0x130
  [3430458.627201]  smp_reschedule_interrupt+0x39/0xe0
  [3430458.633860]  reschedule_interrupt+0x84/0x90
  [3430458.640138]  </IRQ>
  [3430458.644096] RIP: 0010:cpuidle_enter_state+0xa7/0x2f0
  [3430458.651289] RSP: 0018:ffffa90100107e68 EFLAGS: 00000246 ORIG_RAX: 
ffffffffffffff02
  [3430458.661431] RAX: ffff91043ec22880 RBX: 000c2ffbd05252a7 RCX: 
000000000000001f
  [3430458.671114] RDX: 000c2ffbd05252a7 RSI: ffffff1e5f04e459 RDI: 
0000000000000000
  [3430458.680819] RBP: ffffa90100107ea8 R08: 00000000ffffffff R09: 
0000000000000d17
  [3430458.690557] R10: ffffa90100107e38 R11: 0000000000000eca R12: 
ffffc900ff401f58
  [3430458.700303] R13: 0000000000000004 R14: ffffffff9bb71d18 R15: 
0000000000000000
  [3430458.710075]  ? cpuidle_enter_state+0x97/0x2f0
  [3430458.716723]  cpuidle_enter+0x17/0x20
  [3430458.722455]  call_cpuidle+0x23/0x40
  [3430458.728041]  do_idle+0x18c/0x1f0
  [3430458.733312]  cpu_startup_entry+0x73/0x80
  [3430458.739293]  start_secondary+0x1ab/0x200
  [3430458.745229]  secondary_startup_64+0xa5/0xb0
  [3430458.751415] Code: 34 10 48 8b 96 38 0a 00 00 48 8b 86 30 0a 00 00 48 8b 
b6 a0 09 00 00 49 d1 e9 48 29 d6 ba 00 00 00 00 48 0f 48 f2 31 d2 44 01 ce <48> 
f7 f6 48 3d ff 03 00 00 77 0c ba 00 04 00 00 48 29 c2 48 0f
  [3430458.775397] RIP: update_group_capacity+0x19d/0x1f0 RSP: ffff91043ec03bd8
  [3430458.784442] ---[ end trace c1ae6368b9740f8a ]---
  [3430458.866540] Kernel panic - not syncing: Fatal exception in interrupt
  [3430458.866591] Kernel Offset: 0x19600000 from 0xffffffff81000000 
(relocation range: 0xffffffff80000000-0xffffffffbfffffff)
  [3430458.954898] ---[ end Kernel panic - not syncing: Fatal exception in 
interrupt

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