This shows up occasionally when doing downloads of moderate size. apt-get update typically triggers it, as does updating plugins on the Wordpress installation running on the VPS.
This seems to affect kernel versions from 4.15.0-47 to at least 4.15.0-55. 4.15.0-46 is unaffected.
Kernel log output below:
[ 342.864309] kernel BUG at /build/linux-aAn8fZ/linux-4.15.0/drivers/net/xen-netfront.c:909!
[ 342.864329] invalid opcode: 0000 [#1] SMP NOPTI
[ 342.864334] Modules linked in: iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_tcpudp xt_recent xt_conntrack nf_conntrack libcrc32c iptable_filter iptable_mangle intel_rapl sb_edac crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd intel_rapl_perf sch_fq_codel ip_tables x_tables autofs4
[ 342.864373] CPU: 0 PID: 1730 Comm: http Tainted: G W 4.15.0-55-generic #60-Ubuntu
[ 342.864385] RIP: e030:xennet_poll+0x8dc/0xbd0
[ 342.864389] RSP: e02b:ffff8880faa03de0 EFLAGS: 00010246
[ 342.864395] RAX: 0000000000000042 RBX: ffff888004914028 RCX: ffff8880f948f000
[ 342.864403] RDX: 00000000000000ed RSI: 0000000000000042 RDI: 0000000040000000
[ 342.864409] RBP: ffff8880faa03ed8 R08: ffff8880f1f46ac0 R09: 000000018020000e
[ 342.864414] R10: ffff8880faa03d80 R11: ffff8880f44e4b00 R12: 000000000000baec
[ 342.864419] R13: 000000000000baed R14: ffff8880f284f000 R15: ffff8880f3660500
[ 342.864431] FS: 00007f286c0482c0(0000) GS:ffff8880faa00000(0000) knlGS:0000000000000000
[ 342.864450] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 342.864457] CR2: 00007f265fb004d0 CR3: 00000000f45cc000 CR4: 0000000000002660
[ 342.864464] Call Trace:
[ 342.864472] <IRQ>
[ 342.864485] net_rx_action+0x140/0x3a0
[ 342.864513] __do_softirq+0xe4/0x2bb
[ 342.864526] ? hypervisor_callback+0x25/0x40
[ 342.864542] irq_exit+0xb8/0xc0
[ 342.864556] xen_evtchn_do_upcall+0x30/0x40
[ 342.864578] xen_do_hypervisor_callback+0x29/0x40
[ 342.864584] </IRQ>
[ 342.864592] RIP: e033:0x7f286bb4b25c
[ 342.864598] RSP: e02b:00007fff734357c8 EFLAGS: 00000a03
[ 342.864606] RAX: 000000008d312d7f RBX: 0000000039db402a RCX: 00000000488fd63e
[ 342.864614] RDX: 000000007a7f0825 RSI: 000000009a3e307c RDI: 00000000807b756b
[ 342.864623] RBP: 000000005d804986 R08: 000000007a7fcd33 R09: 000000000137510b
[ 342.864631] R10: 000000005c03dbab R11: 000000006d0d84dc R12: 00000000931464fb
[ 342.864636] R13: 00000000aa89b1ac R14: 000000007cbb254f R15: 000000001e81958a
[ 342.864643] Code: 83 f3 ff e9 33 fd ff ff 44 89 eb 44 89 ad 40 ff ff ff 44 8b 8d 50 ff ff ff 4d 89 e6 4c 8b ad 58 ff ff ff 83 c3 01 e9 78 fe ff ff <0f> 0b 48 89 d8 45 8d 6c 24 02 4c 89 f3 49 89 c6 e9 7b fc ff ff
[ 342.864702] RIP: xennet_poll+0x8dc/0xbd0 RSP: ffff8880faa03de0
[ 342.864718] ---[ end trace 2a48579c5f763183 ]---
[ 342.864723] Kernel panic - not syncing: Fatal exception in interrupt
[ 342.864750] Kernel Offset: disabled
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-32-generic 4.15.0-32.35
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
Uname: Linux 4.15.0-32-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 24 10:40 seq
crw-rw---- 1 root audio 116, 33 Jul 24 10:40 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Wed Jul 24 10:59:40 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
PciMultimedia:
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: root=/dev/xvda1 ro console=hvc0 quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.15.0-32-generic N/A
linux-backports-modules-4.15.0-32-generic N/A
linux-firmware 1.173.9
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-08-15 (342 days ago)
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jul 24 10:40 seq
crw-rw---- 1 root audio 116, 33 Jul 24 10:40 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lspci:
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: root=/dev/xvda1 ro console=hvc0 quiet splash
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-32-generic N/A
linux-backports-modules-4.15.0-32-generic N/A
linux-firmware 1.173.9
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: bionic
Uname: Linux 4.15.0-32-generic x86_64
UpgradeStatus: Upgraded to bionic on 2018-08-15 (342 days ago)
UserGroups:
_MarkForUpload: True
This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1837751
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the Ubuntu Kernel Team.