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kern/56447: Random rump kernel panic: assertion "LIST_EMPTY(&p->p_lwps)" failed

>Number:         56447
>Category:       kern
>Synopsis:       Random rump kernel panic: assertion "LIST_EMPTY(&p->p_lwps)" failed
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 07 10:15:01 +0000 2021
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
System: NetBSD
Architecture: x86_64
Machine: amd64

Running the ATF tests on real amd64 hardware, I'm seeing random test
failures where the rump kernel panics with the message

  panic: kernel diagnostic assertion "LIST_EMPTY(&p->p_lwps)" failed

It happened yesterday in net/ipsec/t_ipsec_tcp:ipsec_tcp_ipv6_ah_null:

The previous occurrence involved the net/if_wg/t_misc:wg_malformed
test case:

It's happened in 12 out of 207 full ATF test runs so far this year.
The first recorded failure is from sources dated 2020.,
but since the failure is infrequent, the bug is likely older.



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