Comment 0 for bug 1837751

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.

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)