Date: Thu, 17 Oct 2019 22:50:54 -0700 From: Xin Li <delphij@delphij.net> To: freebsd-net <freebsd-net@freebsd.org>, freebsd-current@freebsd.org Subject: in6_mcast: in6_joingroup attempts to acquire IN6_MULTI_LOCK when sleeping prohibited Message-ID: <51c89593-a34b-46f8-bb4b-d1793ce6d1ae@delphij.net>
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From: Xin Li <delphij@delphij.net>
Reply-To: d@delphij.net
To: freebsd-net <freebsd-net@freebsd.org>, freebsd-current@freebsd.org
Message-ID: <51c89593-a34b-46f8-bb4b-d1793ce6d1ae@delphij.net>
Subject: in6_mcast: in6_joingroup attempts to acquire IN6_MULTI_LOCK when
sleeping prohibited
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I have seen this on boot of my laptop.
It appears that in6_joingroup() was called in netisr_dispatch_src
codepath, and it tried to acquire IN6_MULTI_LOCK(), which happened to
sleep because we failed to acquire the sx, thus triggered the panic.
=3D=3D=3D
panic: sleepq_add: td 0xfffff8000ecd6000 to sleep on wchan
0xffffffff81dedfe0 with sleeping prohibited
#1 0xffffffff80bbff90 in kern_reboot (howto=3D260)
at /usr/src/sys/kern/kern_shutdown.c:479
#2 0xffffffff80bc03e6 in vpanic (fmt=3D<value optimized out>,
ap=3D<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:908
#3 0xffffffff80bc0143 in panic (fmt=3D<value optimized out>)
at /usr/src/sys/kern/kern_shutdown.c:835
#4 0xffffffff80c1a2bf in sleepq_add (wchan=3D0xffffffff81dedfe0, lock=3D=
0x0,
wmesg=3D0xffffffff8110f331 "in6_multi_sx", flags=3D3, queue=3D0)
at /usr/src/sys/kern/subr_sleepqueue.c:318
#5 0xffffffff80bc9ce4 in _sx_xlock_hard (sx=3D0xffffffff81dedfe0,
x=3D18446735277856440320, opts=3D<value optimized out>,
file=3D<value optimized out>, line=3D<value optimized out>)
at /usr/src/sys/kern/kern_sx.c:841
#6 0xffffffff80bc983f in _sx_xlock (sx=3D0xffffffff81dedfe0, opts=3D0,
file=3D0xffffffff8113a568 "/usr/src/sys/netinet6/in6_mcast.c", line=3D=
1185)
at /usr/src/sys/kern/kern_sx.c:325
#7 0xffffffff80e17dd1 in in6_joingroup (ifp=3D0xfffff80003b99800,
mcaddr=3D0xfffffe00e1612e58, imf=3D<value optimized out>,
pinm=3D0xfffff80019e17300, delay=3D2) at
/usr/src/sys/netinet6/in6_mcast.c:1185
#8 0xffffffff80e0fa72 in in6_update_ifa (ifp=3D0xfffff80003b99800,
ifra=3D<value optimized out>, ia=3D<value optimized out>,
flags=3D<value optimized out>) at /usr/src/sys/netinet6/in6.c:752
#9 0xffffffff80e374c5 in nd6_ra_input (m=3D0xfffff800191d4a00,
off=3D<value optimized out>, icmp6len=3D<value optimized out>)
at /usr/src/sys/netinet6/nd6_rtr.c:2274
#10 0xffffffff80e096d5 in icmp6_input (mp=3D<value optimized out>,
offp=3D0xfffffe00e161335c, proto=3D<value optimized out>)
at /usr/src/sys/netinet6/icmp6.c:767
#11 0xffffffff80e22dff in ip6_input (m=3D0xfffff800191d4a00)
at /usr/src/sys/netinet6/ip6_input.c:963
#12 0xffffffff80ceff11 in netisr_dispatch_src (proto=3D6, source=3D0,
m=3D0xfffff800191d4a00) at /usr/src/sys/net/netisr.c:1127
#13 0xffffffff80cd399e in ether_demux (ifp=3D0xfffff80003b99800,
m=3D<value optimized out>) at /usr/src/sys/net/if_ethersubr.c:916
#14 0xffffffff80cd4f88 in ether_nh_input (m=3D<value optimized out>)
at /usr/src/sys/net/if_ethersubr.c:705
#15 0xffffffff80ceff11 in netisr_dispatch_src (proto=3D5, source=3D0,
m=3D0xfffff800191d4a00) at /usr/src/sys/net/netisr.c:1127
#16 0xffffffff80cd3e8d in ether_input (ifp=3D0xfffff8000397a800, m=3D0x0)=
at /usr/src/sys/net/if_ethersubr.c:824
#17 0xffffffff80d429f0 in sta_input (ni=3D<value optimized out>,
m=3D0xfffff800191d4a00, rxs=3D<value optimized out>,
rssi=3D<value optimized out>, nf=3D<value optimized out>)
at /usr/src/sys/net80211/ieee80211_sta.c:891
#18 0xffffffff80d1ec2a in ieee80211_input_mimo (ni=3D0xfffffe0106c66000,
m=3D0xfffff800191d4a00) at /usr/src/sys/net80211/ieee80211_input.c:10=
1
#19 0xffffffff848e55a2 in iwm_mvm_rx_rx_mpdu (sc=3D0xfffffe00e2c00000,
m=3D0xfffff800191d4a00, offset=3D<value optimized out>,
stolen=3D<value optimized out>) at /usr/src/sys/dev/iwm/if_iwm.c:3245=
#20 0xffffffff848e3fee in iwm_intr (arg=3D<value optimized out>)
at /usr/src/sys/dev/iwm/if_iwm.c:5151
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