kern/55234: panic kernel diagnostic assertion "IFNET_LOCKED(ifp)" failed: file "/usr/src/sys/arch/xen/xen/if_xennet_xenbus.c", line 1270

[kardel%netbsd.org@localhost]

	Note: There was a bad value `nn' for the field `Confidential'.
	It was set to the default value of `yes'.

>Number:         55234
>Category:       kern
>Synopsis:       kernel diagnostic assertion "IFNET_LOCKED(ifp)" failed: file "/usr/src/sys/arch/xen/xen/if_xennet_xenbus.c", line 1270
>Confidential:   yes
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue May 05 10:05:00 +0000 2020
>Originator:     Frank Kardel
>Release:        NetBSD 9.99.95 @20200504
>Organization:
>Environment:
	
	
System: NetBSD Andromeda 9.99.59 NetBSD 9.99.59 (XEN3_DOMU) #4: Mon May  4 18:50:57 CEST 2020 kardel@:/usr/src/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	starting a XEN3_DOMU GENERIC kernel using xen411 panics with
	kernel diagnostic assertion "IFNET_LOCKED(ifp)" failed: file "/usr/src/sys/arch/xen/xen/if_xennet_xenbus.c", line 1270
	during rc phase. Last rc output is:
	...
	Starting syslogd.
	Setting date via ntp.
	Starting rpcbind.
	panic: ...

	Stacktrace is:
[  21.5300293] panic: kernel diagnostic assertion "IFNET_LOCKED(ifp)" failed: file "/usr/src/sys/arch/xen/xen/if_xennet_xenbus.c", line 1270
[  21.5300293] cpu2: Begin traceback...
[  21.5300293] vpanic() at netbsd:vpanic+0x146
[  21.5300293] kern_assert() at netbsd:kern_assert+0x48
[  21.5300293] xennet_ioctl() at netbsd:xennet_ioctl+0x6d
[  21.5300293] if_mcast_op() at netbsd:if_mcast_op+0x6a
[  21.5300293] in6_addmulti() at netbsd:in6_addmulti+0x153
[  21.5300293] in6_joingroup() at netbsd:in6_joingroup+0x45
[  21.5300293] ip6_ctloutput() at netbsd:ip6_ctloutput+0x141c
[  21.5300293] udp6_ctloutput() at netbsd:udp6_ctloutput+0xa2
[  21.5300293] udp6_ctloutput_wrapper() at netbsd:udp6_ctloutput_wrapper+0x2c
[  21.5300293] sosetopt() at netbsd:sosetopt+0x5c
[  21.5300293] sys_setsockopt() at netbsd:sys_setsockopt+0x8e
[  21.5300293] syscall() at netbsd:syscall+0x9c
[  21.5300293] --- syscall (number 105) ---
[  21.5300293] 79390333487a:
[  21.5300293] cpu2: End traceback...
[  21.5300293] rebooting...

>How-To-Repeat:
	Use a -current 9.99.59 @20200504 to boot a rpcbind enabled system.
	Watch the panic/reboot loop.

>Fix:
	-not provided-