[Bug 294184] Invoking IPv6 network device address event may sleep with 1 sleep inhibitors

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294184

            Bug ID: 294184
           Summary: Invoking IPv6 network device address event may sleep
                    with 1 sleep inhibitors
           Product: Base System
           Version: 16.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: gbe@FreeBSD.org

I am seeing this error message since a while now on 16-CURRENT. I can't tell
when it first appear. It is printed multiple times after boot. The system is a
virtual machine based on VMWare Fusion on an Intel based MacPro. The network
interface is vmx0.

The full message is

vmx0: link state changed to UP
Invoking IPv6 network device address event may sleep with 1 sleep inhibitors
stack backtrace:
#0 0xffffffff80c4ad9c at witness_debugger+0x6c
#1 0xffffffff80c4c6a9 at witness_warn+0x4c9
#2 0xffffffff80e14677 at in6_update_ifa+0xc67
#3 0xffffffff80e41ccf at in6_ifadd+0x30f
#4 0xffffffff80e3e286 at nd6_ra_input+0x1066
#5 0xffffffff80e0e120 at icmp6_input+0x5b0
#6 0xffffffff80e28a55 at ip6_input+0xbb5
#7 0xffffffff80d3e4a4 at netisr_dispatch_src+0xb4
#8 0xffffffff80d2026a at ether_demux+0x16a
#9 0xffffffff80d217de at ether_nh_input+0x3ce
#10 0xffffffff80d3e4a4 at netisr_dispatch_src+0xb4
#11 0xffffffff80d206b5 at ether_input+0xd5
#12 0xffffffff80de682c at tcp_lro_flush_all+0xdc
#13 0xffffffff80d39e1f at iflib_rxeof+0xbff
#14 0xffffffff80d3424a at _task_fn_rx+0x7a
#15 0xffffffff80c21b2e at gtaskqueue_run_locked+0x18e
#16 0xffffffff80c21863 at gtaskqueue_thread_loop+0xd3
#17 0xffffffff80b7fe82 at fork_exit+0x82

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