https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271366
Bug ID: 271366
Summary: Invoking IPv6 network device address event may sleep
with the following non-sleepable locks held
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: pku...@freebsd.org
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"
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