Look like this is a duplicate of
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1842447
Just for the record: here is the kernel stack trace:
crash> bt
PID: 0 TASK: ffffffff82413480 CPU: 0 COMMAND: "swapper/0"
#0 [ffff88807fc037d8] die at ffffffff81031d32
#1 [ffff88807fc03808] do_trap at ffffffff8102dbf1
#2 [ffff88807fc03850] do_error_trap at ffffffff8102e1b6
#3 [ffff88807fc03910] do_invalid_op at ffffffff8102e670
#4 [ffff88807fc03920] invalid_op at ffffffff81a00edb
[exception RIP: ip_do_fragment+1154]
RIP: ffffffff818ba2d2 RSP: ffff88807fc039d8 RFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff888077027900 RCX: ffffffff8184cdf0
RDX: 0000000000000034 RSI: 00000000000005c8 RDI: ffff888078d8cb00
RBP: ffff88807fc03a40 R8: ffff888078cf3600 R9: 00000000000005dc
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000014
R13: ffff888078d8c800 R14: 0000000000000678 R15: ffff888078cf364e
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#5 [ffff88807fc03a48] ip_fragment.constprop.45 at ffffffff818ba6b3
#6 [ffff88807fc03a60] ip_finish_output at ffffffff818ba872
#7 [ffff88807fc03aa0] ip_output at ffffffff818bbd50
#8 [ffff88807fc03b00] ip_forward_finish at ffffffff818b7951
#9 [ffff88807fc03b28] ip_forward at ffffffff818b7cf6
#10 [ffff88807fc03b98] ip_rcv_finish at ffffffff818b57f9
#11 [ffff88807fc03bd0] ip_rcv at ffffffff818b61e6
#12 [ffff88807fc03c38] __netif_receive_skb_core at ffffffff81867f82
#13 [ffff88807fc03cd8] __netif_receive_skb at ffffffff81868708
#14 [ffff88807fc03d08] netif_receive_skb_internal at ffffffff8186aa95
#15 [ffff88807fc03d38] napi_gro_receive at ffffffff8186b815
#16 [ffff88807fc03d60] receive_buf at ffffffffc0034f92 [virtio_net]
#17 [ffff88807fc03e48] virtnet_poll at ffffffffc00361e2 [virtio_net]
#18 [ffff88807fc03ec0] net_rx_action at ffffffff8186aef0
#19 [ffff88807fc03f40] __softirqentry_text_start at ffffffff81c000e4
#20 [ffff88807fc03fa8] irq_exit at ffffffff81096ae5
#21 [ffff88807fc03fb8] do_IRQ at ffffffff81a02736
--- <IRQ stack> ---
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https://bugs.launchpad.net/bugs/1842726
Title:
Random freezes on 4.15.0-60
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