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kern/56705: wapbl lockdebug panic during tcpdump run

>Number:         56705
>Category:       kern
>Synopsis:       wapbl lockdebug panic during tcpdump run
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Feb 12 17:10:00 +0000 2022
>Originator:     Hauke Fath
>Release:        NetBSD 9.99.93
Falling Raindrops
System: NetBSD pizza 9.99.93 NetBSD 9.99.93 (BLACKBOX-$Revision: 1.85 $) #5: Fri Feb 11 21:11:10 CET 2022 hauke@pizza:/var/obj/netbsd-build-objects/developer/amd64/sys/arch/amd64/compile/BLACKBOX amd64
Architecture: x86_64
Machine: amd64

	I am attempting to debug a client machine's hang during tcp
	transfers (here: an ftp session) by running tcpdump on the
	target (ftp server) machine. Unfortunately, the tcpdump
	frequently aborts with a 'no permission' error, and every few
	attempts the machine panics with a lockdebug error in a wapbl


	The USB console keyboard is dead at that point, and the
	machine swaps to a raidframe mirror, which cannot be dumped to.

	Strangely enough, the directory that tcpdump writes the pcap
	file to is on zfs, and so is the directory ftp'ed to.


	tcpdump an incoming ftp transfer on the ftp server side. Watch
	the machine panic on (roughly) every fifth attempt.

	Yes, please.



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