During booting of a CURRENT VM (rev. 74192f9b2d24) on powerpc64le, when starting vtnet0 NIC, there are following lock warnings: Invoking IPv6 network device address event may sleep with the following non-sleepable locks held: exclusive sleep mutex vtnet0-rx0 (vtnet0-rx0) r = 0 (0xc0000000081c0480) locked @ /usr/src/sys/dev/virtio/network/if_vtnet.c:2188 stack backtrace: #0 0xc00000000091bb38 at witness_debugger+0x98 #1 0xc00000000091d300 at witness_warn+0x4b0 #2 0xc000000000b3ad38 at in6_update_ifa+0xc08 #3 0xc000000000b717b8 at in6_ifadd+0x268 #4 0xc000000000b6ce94 at nd6_ra_input+0x10e4 #5 0xc000000000b34bb8 at icmp6_input+0x8a8 #6 0xc000000000b53dfc at ip6_input+0xdac #7 0xc000000000a432ac at netisr_dispatch_src+0x11c #8 0xc000000000a43754 at netisr_dispatch+0x24 #9 0xc000000000a1b8c4 at ether_demux+0x1c4 #10 0xc000000000a1d6b4 at ether_nh_input+0x454 #11 0xc000000000a432ac at netisr_dispatch_src+0x11c #12 0xc000000000a43754 at netisr_dispatch+0x24 #13 0xc000000000a1bec8 at ether_input+0x118 #14 0xc000000000a14a48 at if_input+0x28 #15 0xc0000000006c011c at vtnet_rxq_eof+0x83c #16 0xc0000000006bf7f4 at vtnet_rx_vq_process+0xf4 #17 0xc0000000006b3cfc at virtqueue_intr+0x2c lock order reversal: (sleepable after non-sleepable) 1st 0xc0000000081c0480 vtnet0-rx0 (vtnet0-rx0, sleep mutex) @ /usr/src/sys/dev/virtio/network/if_vtnet.c:2188 2nd 0xc0000000019f48c0 in6_multi_sx (in6_multi_sx, sx) @ /usr/src/sys/netinet6/in6_mcast.c:1219 lock order vtnet0-rx0 -> in6_multi_sx attempted at: #0 0xc00000000091b570 at witness_checkorder+0xc60 #1 0xc00000000088e000 at _sx_xlock+0x90 #2 0xc000000000b46e64 at in6_joingroup+0x64 #3 0xc000000000b3b0e0 at in6_update_ifa+0xfb0 #4 0xc000000000b717b8 at in6_ifadd+0x268 #5 0xc000000000b6ce94 at nd6_ra_input+0x10e4 #6 0xc000000000b34bb8 at icmp6_input+0x8a8 #7 0xc000000000b53dfc at ip6_input+0xdac #8 0xc000000000a432ac at netisr_dispatch_src+0x11c #9 0xc000000000a43754 at netisr_dispatch+0x24 #10 0xc000000000a1b8c4 at ether_demux+0x1c4 #11 0xc000000000a1d6b4 at ether_nh_input+0x454 #12 0xc000000000a432ac at netisr_dispatch_src+0x11c #13 0xc000000000a43754 at netisr_dispatch+0x24 #14 0xc000000000a1bec8 at ether_input+0x118 #15 0xc000000000a14a48 at if_input+0x28 #16 0xc0000000006c011c at vtnet_rxq_eof+0x83c #17 0xc0000000006bf7f4 at vtnet_rx_vq_process+0xf4 I have in /etc/rc.conf: ifconfig_vtnet0="DHCP" ifconfig_vtnet0_ipv6="inet6 accept_rtadv"
seen before, https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269821 but i foolishly closed it, because i didn't realise it could be spurious
Same here on amd64, running as a Xen DomU virtual machine: $ uname -rv 15.0-CURRENT FreeBSD 15.0-CURRENT amd64 1500000 #0 main-n265049-8ed0ecf8024d: Sat Aug 26 14:44:23 UTC 2023 dummy@freebsd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC $ grep if /etc/rc.conf ifconfig_DEFAULT="DHCP inet6 accept_rtadv" $ dmesg [...] lo0: link state changed to UP xn0: 2 link states coalesced xn0: link state changed to UP Invoking IPv6 network device address event may sleep with the following non-sleepable locks held: exclusive sleep mutex xnrx_2 (netfront receive lock) r = 0 (0xfffffe006a304a78) locked @ /usr/src/sys/dev/xen/netfront/netfront.c:677 stack backtrace: #0 0xffffffff80bcd5c5 at witness_debugger+0x65 #1 0xffffffff80bce75a at witness_warn+0x3fa #2 0xffffffff80d7b39c at in6_update_ifa+0xc0c #3 0xffffffff80da7109 at in6_ifadd+0x1d9 #4 0xffffffff80da3854 at nd6_ra_input+0x1034 #5 0xffffffff80d75c14 at icmp6_input+0x724 #6 0xffffffff80d8e5df at ip6_input+0xc9f #7 0xffffffff80cb14cf at netisr_dispatch_src+0xaf #8 0xffffffff80c93caa at ether_demux+0x17a #9 0xffffffff80c95313 at ether_nh_input+0x393 #10 0xffffffff80cb14cf at netisr_dispatch_src+0xaf #11 0xffffffff80c940e9 at ether_input+0xd9 #12 0xffffffff809cb78c at xn_rxeof+0x5ec #13 0xffffffff809ccad8 at xn_intr+0x48 #14 0xffffffff80b126f9 at ithread_loop+0x279 #15 0xffffffff80b0eab2 at fork_exit+0x82 #16 0xffffffff8102fede at fork_trampoline+0xe lock order reversal: (sleepable after non-sleepable) 1st 0xfffffe006a304a78 xnrx_2 (netfront receive lock, sleep mutex) @ /usr/src/sys/dev/xen/netfront/netfront.c:677 2nd 0xffffffff81aaaba0 in6_multi_sx (in6_multi_sx, sx) @ /usr/src/sys/netinet6/in6_mcast.c:1217 lock order netfront receive lock -> in6_multi_sx attempted at: #0 0xffffffff80bcd18d at witness_checkorder+0xbfd #1 0xffffffff80b645c2 at _sx_xlock+0x62 #2 0xffffffff80d83b61 at in6_joingroup+0x31 #3 0xffffffff80d7b765 at in6_update_ifa+0xfd5 #4 0xffffffff80da7109 at in6_ifadd+0x1d9 #5 0xffffffff80da3854 at nd6_ra_input+0x1034 #6 0xffffffff80d75c14 at icmp6_input+0x724 #7 0xffffffff80d8e5df at ip6_input+0xc9f #8 0xffffffff80cb14cf at netisr_dispatch_src+0xaf #9 0xffffffff80c93caa at ether_demux+0x17a #10 0xffffffff80c95313 at ether_nh_input+0x393 #11 0xffffffff80cb14cf at netisr_dispatch_src+0xaf #12 0xffffffff80c940e9 at ether_input+0xd9 #13 0xffffffff809cb78c at xn_rxeof+0x5ec #14 0xffffffff809ccad8 at xn_intr+0x48 #15 0xffffffff80b126f9 at ithread_loop+0x279 #16 0xffffffff80b0eab2 at fork_exit+0x82 #17 0xffffffff8102fede at fork_trampoline+0xe