panic: excl->share
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syzbot
Jan 3, 2026, 8:00:27 AM (9 days ago) Jan 3
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 80bc9799356e Protect IGMP and MLD6 fast timer with rwlock.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1627669a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=c366cf5e7c87ead7f4f7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/91089fc9acd2/disk-80bc9799.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d43f4be640bc/bsd-80bc9799.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d583b541db80/kernel-80bc9799.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c366cf...@syzkaller.appspotmail.com
panic: excl->share
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
448387 51318 0 0x14000 0x200 0 reaper
*361801 9091 0 0x14000 0x200 1 softclockmp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: excl->share
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a1fe490
rbx 0xffff8000299dee07
rdx 0
rcx 0xffff8000ffffe298
rax 0xffff8000299ddff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xefea1618a9606c49
r11 0xbb9cb982aaadc1a1
r12 0xffff8000299dec08
r13 0
r14 0
r15 0x1
rip 0xffffffff817c1d35 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a1fe480
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (softclockmp) tid=361801 pid=9091 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=0, usrpri=50, slppri=0, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffffea60,0xffff8000ffffe010
process=0xffff8000ffffa1b0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00
estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7491 257343 53163 0 2 0 syz-executor
7491 178311 53163 0 3 0x4000000 netlock syz-executor
7491 204782 53163 0 3 0x4000080 fsleep syz-executor
83496 224784 43988 0 2 0 syz-executor
83496 317535 43988 0 2 0x4000080 syz-executor
83496 438054 43988 0 3 0x4000080 fsleep syz-executor
65702 87699 55976 0 2 0 syz-executor
65702 289283 55976 0 3 0x4000080 fsleep syz-executor
65702 102794 55976 0 3 0x4000080 fsleep syz-executor
71544 371731 1941 0 2 0xc80 syz-executor
71544 67871 1941 0 3 0x4000080 sbwait syz-executor
71544 214840 1941 0 3 0x4000080 fsleep syz-executor
71544 43314 1941 0 3 0x4000080 fsleep syz-executor
82324 51188 20336 60929 2 0xc90 syz-executor
82324 11765 20336 60929 3 0x4000090 msgwait syz-executor
82324 63993 20336 60929 3 0x4000090 fsleep syz-executor
1941 294357 64236 0 3 0x82 nanoslp syz-executor
2496 34769 19741 0 3 0x3000 suspend syz-executor
2496 135580 19741 0 2 0x4081000 syz-executor
2496 337603 19741 0 3 0x4081000 inode syz-executor
68337 490988 1 0 3 0x80 nanoslp init
20336 474272 64236 0 2 0x2 syz-executor
53806 136021 64236 0 3 0x82 wait syz-executor
43988 299755 64236 0 2 0x2 syz-executor
53163 487487 64236 0 3 0x82 nanoslp syz-executor
37751 464493 64236 0 2 0xc82 syz-executor
55976 57073 64236 0 3 0x82 nanoslp syz-executor
19741 31912 64236 0 2 0xc82 syz-executor
64236 347213 54885 0 3 0x82 kqread syz-executor
54885 316818 64383 0 3 0x10008a sigsusp ksh
64383 514056 14938 0 3 0x98 kqread sshd-session
14938 349811 87717 0 3 0x92 kqread sshd-session
87717 86683 1 0 3 0x88 kqread sshd
28453 125854 25152 74 3 0x1100092 bpf pflogd
25152 155623 1 0 3 0x80 sbwait pflogd
14943 523252 25026 73 3 0x1100090 kqread syslogd
25026 313792 1 0 3 0x100082 sbwait syslogd
35607 355194 1 0 3 0x100080 kqread resolvd
66979 357862 43286 77 3 0x100092 kqread dhcpleased
19264 117338 43286 77 3 0x100092 kqread dhcpleased
43286 480960 1 0 3 0x80 kqread dhcpleased
12077 261705 0 0 2 0x40014200 smr
17844 510362 0 0 3 0x14200 pgzero zerothread
16394 28944 0 0 3 0x14200 aiodoned aiodoned
21002 321279 0 0 3 0x14200 syncer update
38874 142664 0 0 3 0x14200 cleaner cleaner
51318 448387 0 0 7 0x14200 reaper
44309 261396 0 0 3 0x14200 pgdaemon pagedaemon
56692 263343 0 0 3 0x14200 bored viomb
48359 259964 0 0 3 0x40014200 acpi0 acpi0
78971 458419 0 0 3 0x40014200 idle1
64739 226788 0 0 3 0x14200 bored softnet1
35538 501074 0 0 3 0x14200 bored softnet0
24221 342361 0 0 3 0x14200 bored systqmp
79807 400879 0 0 3 0x14200 bored systq
* 9091 361801 0 0 7 0x14200 softclockmp
49134 437431 0 0 3 0x40014200 tmoslp softclock
84584 443773 0 0 3 0x40014200 idle0
1 520768 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 2496 (syz-executor) thread 0xffff80003c3fc020 (135580)
exclusive rrwlock inode r = 0 (0xfffffd806fa56a08)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vn_write+0x18f sys/kern/vfs_vnops.c:405
#6 dofilewritev+0x242 sys/kern/sys_generic.c:380
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 2496 (syz-executor) thread 0xffff80003c3fc7e8 (337603)
exclusive rrwlock inode r = 0 (0xfffffd806f1106d8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
#6 namei+0x7ca sys/kern/vfs_lookup.c:250
#7 dorenameat+0x91 sys/kern/vfs_syscalls.c:2990
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 9091 (softclockmp) thread 0xffff8000ffffe298 (361801)
exclusive rwlock maddr r = 0 (0xffff800001598878)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 mld6_fasttimo+0x8c mld6_checktimer sys/netinet6/mld6.c:-1 [inline]
#2 mld6_fasttimo+0x8c sys/netinet6/mld6.c:369
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock netlock r = 0 (0xffffffff83832e50)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 mld6_fasttimo+0x5f sys/netinet6/mld6.c:-1
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock timeout r = 0 (0xffffffff8383b008)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 timeout_run+0x131 sys/kern/kern_timeout.c:694
#2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#3 softclock_thread_mp+0x86
#4 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11058 12086K 12486K 166960K 12468 0
pcb 18 12K 12K 166960K 75 0
rtable 236 9K 10K 166960K 429 0
pf 32 17K 81K 166960K 85 0
ifaddr 40 7K 8K 166960K 70 0
ifgroup 51 2K 2K 166960K 95 0
sysctl 3 1K 9K 166960K 7 0
counters 68 36K 38K 166960K 124 0
ioctlops 0 0K 4K 166960K 1527 0
iov 0 0K 4K 166960K 4 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1337 84K 85K 166960K 1558 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 11 0K 0K 166960K 14 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 106K 166960K 396 0
sigio 0 0K 0K 166960K 4 0
proc 63 99K 163K 166960K 577 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 61 0
in_multi 92 6K 7K 166960K 138 0
ether_multi 1 0K 0K 166960K 8 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 79 360K 360K 166960K 79 0
exec 0 0K 1K 166960K 403 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 253 156K 169K 166960K 5335 0
UVM aobj 12 8K 8K 166960K 13 0
pinsyscall 41 82K 108K 166960K 1557 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 1K 166960K 19 0
NDP 13 0K 2K 166960K 48 0
temp 46 8672K 8736K 166960K 9639 0
kqueue 15 24K 36K 166960K 80 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 50 0 47 1 0 1 1 0 8 0
rtentry 176 129 0 28 6 0 6 6 0 8 0
unpcb 144 132 0 113 2 0 2 2 0 8 1
syncache 336 8 0 8 1 0 1 1 0 8 1
tcpqe 32 2 0 2 1 0 1 1 0 8 1
tcpcb 736 101 0 91 4 0 4 4 0 8 3
arp 136 22 0 5 1 0 1 1 0 8 0
inpcb 328 390 0 375 7 1 6 7 0 8 4
nd6 152 27 0 6 1 0 1 1 0 8 0
kcovpl 48 9 0 1 1 0 1 1 0 8 0
ppxss 1192 24 0 24 1 0 1 1 0 8 1
pppxif 1576 2 0 2 1 0 1 1 0 8 1
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 1 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 29 0 0 1 0 1 1 0 8 0
pfstkey 128 29 0 0 1 0 1 1 0 8 0
pfstate 448 29 0 0 4 0 4 4 0 8 0
pfrule 1344 22 0 18 2 1 1 2 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 513 0 102 29 0 29 29 0 8 1
art_table 40 516 0 102 5 0 5 5 0 8 0
art_node 32 129 0 37 1 0 1 1 0 8 0
semapl 112 11 0 2 1 0 1 1 0 8 0
shmpl 112 8 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2007 0 496 95 0 95 95 0 8 0
ffsino 296 2007 0 496 117 0 117 117 0 8 0
nchpl 144 2541 0 834 64 0 64 64 0 8 0
rtmask 32 5 0 5 1 0 1 1 0 8 1
vnodes 216 2191 0 0 122 0 122 122 0 8 0
namei 1024 7875 0 7874 1 0 1 1 0 8 0
percpumem 16 77 0 28 1 0 1 1 0 8 0
vcpupl 3968 2 0 1 1 0 1 1 0 8 0
vmpool 848 2 0 1 1 0 1 1 0 8 0
kstatmem 264 58 0 34 3 0 3 3 0 8 1
scsiplug 72 1 0 1 1 0 1 1 0 8 1
scxspl 216 12600 0 12600 9 1 8 8 1 8 8
plimitpl 152 153 0 136 1 0 1 1 0 8 0
sigapl 424 700 0 652 7 0 7 7 0 8 1
knotepl 120 314 0 0 10 0 10 10 0 8 0
kqueuepl 224 123 0 110 2 0 2 2 0 8 1
pipepl 344 168 0 141 6 1 5 6 0 8 2
fdescpl 528 684 0 653 3 0 3 3 0 8 0
filepl 160 3006 0 2778 12 0 12 12 0 8 1
lockfpl 104 69 0 64 1 0 1 1 0 8 0
lockfspl 48 34 0 30 1 0 1 1 0 8 0
sessionpl 144 26 0 18 1 0 1 1 0 8 0
pgrppl 48 41 0 25 1 0 1 1 0 8 0
ucredpl 104 307 0 293 1 0 1 1 0 8 0
zombiepl 144 655 0 652 1 0 1 1 0 8 0
processpl 1232 700 0 652 5 0 5 5 0 8 1
procpl 664 1110 0 1049 6 0 6 6 0 8 0
sosppl 176 2 0 2 1 0 1 1 0 8 1
sockpl 752 581 0 544 11 1 10 11 0 8 6
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl16k 16384 11 0 0 2 0 2 2 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 124 0 0 16 0 16 16 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 24 0 0 3 0 3 3 0 8 0
mtagpl 96 5 0 0 1 0 1 1 0 8 0
mbufpl 256 178 0 0 12 0 12 12 0 8 0
bufpl 280 4968 0 131 346 0 346 346 0 8 0
anonpl 32 10529 0 0 85 0 85 85 0 246 0
amapchunkpl 152 16683 0 16006 29 0 29 29 0 158 1
amappl16 200 2995 0 2742 23 6 17 17 0 8 3
amappl15 192 16 0 16 1 1 0 1 0 8 0
amappl14 184 5 0 5 1 1 0 1 0 8 0
amappl13 176 438 0 437 1 0 1 1 0 8 0
amappl12 168 1054 0 1014 3 0 3 3 0 8 0
amappl11 160 35 0 34 1 0 1 1 0 8 0
amappl10 152 78 0 64 1 0 1 1 0 8 0
amappl9 144 251 0 251 1 1 0 1 0 8 0
amappl8 136 45 0 43 1 0 1 1 0 8 0
amappl7 128 114 0 113 1 0 1 1 0 8 0
amappl6 120 289 0 276 1 0 1 1 0 8 0
amappl5 112 142 0 132 1 0 1 1 0 8 0
amappl4 104 451 0 422 1 0 1 1 0 8 0
amappl3 96 2712 0 2615 4 1 3 3 0 8 0
amappl2 88 807 0 735 2 0 2 2 0 8 0
amappl1 80 10710 0 10139 15 1 14 15 0 8 0
amappl 88 4541 0 4361 5 0 5 5 0 92 0
uvmvnodes 80 107 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 254 0 254 2 1 1 1 0 8 1
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 12 0 1 1 0 1 1 0 8 0
uaddrrnd 24 684 0 653 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 684 0 653 1 0 1 1 0 8 0
vmmpekpl 168 7567 0 7523 3 0 3 3 0 8 0
vmmpepl 168 52026 0 49909 98 0 98 98 0 357 0
vmsppl 488 683 0 653 5 0 5 5 0 8 0
rwobjpl 80 17704 0 16455 27 0 27 27 0 8 0
pdppl 4096 1379 0 1309 98 24 74 85 0 8 4
pvpl 32 18998 0 0 154 0 154 154 0 265 0
pmappl 256 685 0 654 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 279 0 26 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505
end trace frame: 0x0, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505
end trace frame: 0x0, count: -6
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x25: addq $0x8,%rsp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 80bc9799356e Protect IGMP and MLD6 fast timer with rwlock.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1627669a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=c366cf5e7c87ead7f4f7
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/91089fc9acd2/disk-80bc9799.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/d43f4be640bc/bsd-80bc9799.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d583b541db80/kernel-80bc9799.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c366cf...@syzkaller.appspotmail.com
panic: excl->share
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
448387 51318 0 0x14000 0x200 0 reaper
*361801 9091 0 0x14000 0x200 1 softclockmp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: excl->share
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a1fe490
rbx 0xffff8000299dee07
rdx 0
rcx 0xffff8000ffffe298
rax 0xffff8000299ddff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xefea1618a9606c49
r11 0xbb9cb982aaadc1a1
r12 0xffff8000299dec08
r13 0
r14 0
r15 0x1
rip 0xffffffff817c1d35 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a1fe480
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (softclockmp) tid=361801 pid=9091 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=0, usrpri=50, slppri=0, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000ffffea60,0xffff8000ffffe010
process=0xffff8000ffffa1b0 user=0xffff80002a1f9000, vmspace=0xffffffff838bee00
estcpu=0, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7491 257343 53163 0 2 0 syz-executor
7491 178311 53163 0 3 0x4000000 netlock syz-executor
7491 204782 53163 0 3 0x4000080 fsleep syz-executor
83496 224784 43988 0 2 0 syz-executor
83496 317535 43988 0 2 0x4000080 syz-executor
83496 438054 43988 0 3 0x4000080 fsleep syz-executor
65702 87699 55976 0 2 0 syz-executor
65702 289283 55976 0 3 0x4000080 fsleep syz-executor
65702 102794 55976 0 3 0x4000080 fsleep syz-executor
71544 371731 1941 0 2 0xc80 syz-executor
71544 67871 1941 0 3 0x4000080 sbwait syz-executor
71544 214840 1941 0 3 0x4000080 fsleep syz-executor
71544 43314 1941 0 3 0x4000080 fsleep syz-executor
82324 51188 20336 60929 2 0xc90 syz-executor
82324 11765 20336 60929 3 0x4000090 msgwait syz-executor
82324 63993 20336 60929 3 0x4000090 fsleep syz-executor
1941 294357 64236 0 3 0x82 nanoslp syz-executor
2496 34769 19741 0 3 0x3000 suspend syz-executor
2496 135580 19741 0 2 0x4081000 syz-executor
2496 337603 19741 0 3 0x4081000 inode syz-executor
68337 490988 1 0 3 0x80 nanoslp init
20336 474272 64236 0 2 0x2 syz-executor
53806 136021 64236 0 3 0x82 wait syz-executor
43988 299755 64236 0 2 0x2 syz-executor
53163 487487 64236 0 3 0x82 nanoslp syz-executor
37751 464493 64236 0 2 0xc82 syz-executor
55976 57073 64236 0 3 0x82 nanoslp syz-executor
19741 31912 64236 0 2 0xc82 syz-executor
64236 347213 54885 0 3 0x82 kqread syz-executor
54885 316818 64383 0 3 0x10008a sigsusp ksh
64383 514056 14938 0 3 0x98 kqread sshd-session
14938 349811 87717 0 3 0x92 kqread sshd-session
87717 86683 1 0 3 0x88 kqread sshd
28453 125854 25152 74 3 0x1100092 bpf pflogd
25152 155623 1 0 3 0x80 sbwait pflogd
14943 523252 25026 73 3 0x1100090 kqread syslogd
25026 313792 1 0 3 0x100082 sbwait syslogd
35607 355194 1 0 3 0x100080 kqread resolvd
66979 357862 43286 77 3 0x100092 kqread dhcpleased
19264 117338 43286 77 3 0x100092 kqread dhcpleased
43286 480960 1 0 3 0x80 kqread dhcpleased
12077 261705 0 0 2 0x40014200 smr
17844 510362 0 0 3 0x14200 pgzero zerothread
16394 28944 0 0 3 0x14200 aiodoned aiodoned
21002 321279 0 0 3 0x14200 syncer update
38874 142664 0 0 3 0x14200 cleaner cleaner
51318 448387 0 0 7 0x14200 reaper
44309 261396 0 0 3 0x14200 pgdaemon pagedaemon
56692 263343 0 0 3 0x14200 bored viomb
48359 259964 0 0 3 0x40014200 acpi0 acpi0
78971 458419 0 0 3 0x40014200 idle1
64739 226788 0 0 3 0x14200 bored softnet1
35538 501074 0 0 3 0x14200 bored softnet0
24221 342361 0 0 3 0x14200 bored systqmp
79807 400879 0 0 3 0x14200 bored systq
* 9091 361801 0 0 7 0x14200 softclockmp
49134 437431 0 0 3 0x40014200 tmoslp softclock
84584 443773 0 0 3 0x40014200 idle0
1 520768 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 2496 (syz-executor) thread 0xffff80003c3fc020 (135580)
exclusive rrwlock inode r = 0 (0xfffffd806fa56a08)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vn_write+0x18f sys/kern/vfs_vnops.c:405
#6 dofilewritev+0x242 sys/kern/sys_generic.c:380
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 2496 (syz-executor) thread 0xffff80003c3fc7e8 (337603)
exclusive rrwlock inode r = 0 (0xfffffd806f1106d8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
#6 namei+0x7ca sys/kern/vfs_lookup.c:250
#7 dorenameat+0x91 sys/kern/vfs_syscalls.c:2990
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 9091 (softclockmp) thread 0xffff8000ffffe298 (361801)
exclusive rwlock maddr r = 0 (0xffff800001598878)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 mld6_fasttimo+0x8c mld6_checktimer sys/netinet6/mld6.c:-1 [inline]
#2 mld6_fasttimo+0x8c sys/netinet6/mld6.c:369
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock netlock r = 0 (0xffffffff83832e50)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 mld6_fasttimo+0x5f sys/netinet6/mld6.c:-1
#3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1
#4 timeout_run+0x159 sys/kern/kern_timeout.c:698
#5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#6 softclock_thread_mp+0x86
#7 proc_trampoline+0x10
shared rwlock timeout r = 0 (0xffffffff8383b008)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 timeout_run+0x131 sys/kern/kern_timeout.c:694
#2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
#3 softclock_thread_mp+0x86
#4 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11058 12086K 12486K 166960K 12468 0
pcb 18 12K 12K 166960K 75 0
rtable 236 9K 10K 166960K 429 0
pf 32 17K 81K 166960K 85 0
ifaddr 40 7K 8K 166960K 70 0
ifgroup 51 2K 2K 166960K 95 0
sysctl 3 1K 9K 166960K 7 0
counters 68 36K 38K 166960K 124 0
ioctlops 0 0K 4K 166960K 1527 0
iov 0 0K 4K 166960K 4 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1337 84K 85K 166960K 1558 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 11 0K 0K 166960K 14 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 106K 166960K 396 0
sigio 0 0K 0K 166960K 4 0
proc 63 99K 163K 166960K 577 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 61 0
in_multi 92 6K 7K 166960K 138 0
ether_multi 1 0K 0K 166960K 8 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 79 360K 360K 166960K 79 0
exec 0 0K 1K 166960K 403 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 253 156K 169K 166960K 5335 0
UVM aobj 12 8K 8K 166960K 13 0
pinsyscall 41 82K 108K 166960K 1557 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 1K 166960K 19 0
NDP 13 0K 2K 166960K 48 0
temp 46 8672K 8736K 166960K 9639 0
kqueue 15 24K 36K 166960K 80 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 50 0 47 1 0 1 1 0 8 0
rtentry 176 129 0 28 6 0 6 6 0 8 0
unpcb 144 132 0 113 2 0 2 2 0 8 1
syncache 336 8 0 8 1 0 1 1 0 8 1
tcpqe 32 2 0 2 1 0 1 1 0 8 1
tcpcb 736 101 0 91 4 0 4 4 0 8 3
arp 136 22 0 5 1 0 1 1 0 8 0
inpcb 328 390 0 375 7 1 6 7 0 8 4
nd6 152 27 0 6 1 0 1 1 0 8 0
kcovpl 48 9 0 1 1 0 1 1 0 8 0
ppxss 1192 24 0 24 1 0 1 1 0 8 1
pppxif 1576 2 0 2 1 0 1 1 0 8 1
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 1 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 29 0 0 1 0 1 1 0 8 0
pfstkey 128 29 0 0 1 0 1 1 0 8 0
pfstate 448 29 0 0 4 0 4 4 0 8 0
pfrule 1344 22 0 18 2 1 1 2 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 513 0 102 29 0 29 29 0 8 1
art_table 40 516 0 102 5 0 5 5 0 8 0
art_node 32 129 0 37 1 0 1 1 0 8 0
semapl 112 11 0 2 1 0 1 1 0 8 0
shmpl 112 8 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2007 0 496 95 0 95 95 0 8 0
ffsino 296 2007 0 496 117 0 117 117 0 8 0
nchpl 144 2541 0 834 64 0 64 64 0 8 0
rtmask 32 5 0 5 1 0 1 1 0 8 1
vnodes 216 2191 0 0 122 0 122 122 0 8 0
namei 1024 7875 0 7874 1 0 1 1 0 8 0
percpumem 16 77 0 28 1 0 1 1 0 8 0
vcpupl 3968 2 0 1 1 0 1 1 0 8 0
vmpool 848 2 0 1 1 0 1 1 0 8 0
kstatmem 264 58 0 34 3 0 3 3 0 8 1
scsiplug 72 1 0 1 1 0 1 1 0 8 1
scxspl 216 12600 0 12600 9 1 8 8 1 8 8
plimitpl 152 153 0 136 1 0 1 1 0 8 0
sigapl 424 700 0 652 7 0 7 7 0 8 1
knotepl 120 314 0 0 10 0 10 10 0 8 0
kqueuepl 224 123 0 110 2 0 2 2 0 8 1
pipepl 344 168 0 141 6 1 5 6 0 8 2
fdescpl 528 684 0 653 3 0 3 3 0 8 0
filepl 160 3006 0 2778 12 0 12 12 0 8 1
lockfpl 104 69 0 64 1 0 1 1 0 8 0
lockfspl 48 34 0 30 1 0 1 1 0 8 0
sessionpl 144 26 0 18 1 0 1 1 0 8 0
pgrppl 48 41 0 25 1 0 1 1 0 8 0
ucredpl 104 307 0 293 1 0 1 1 0 8 0
zombiepl 144 655 0 652 1 0 1 1 0 8 0
processpl 1232 700 0 652 5 0 5 5 0 8 1
procpl 664 1110 0 1049 6 0 6 6 0 8 0
sosppl 176 2 0 2 1 0 1 1 0 8 1
sockpl 752 581 0 544 11 1 10 11 0 8 6
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl16k 16384 11 0 0 2 0 2 2 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 124 0 0 16 0 16 16 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 24 0 0 3 0 3 3 0 8 0
mtagpl 96 5 0 0 1 0 1 1 0 8 0
mbufpl 256 178 0 0 12 0 12 12 0 8 0
bufpl 280 4968 0 131 346 0 346 346 0 8 0
anonpl 32 10529 0 0 85 0 85 85 0 246 0
amapchunkpl 152 16683 0 16006 29 0 29 29 0 158 1
amappl16 200 2995 0 2742 23 6 17 17 0 8 3
amappl15 192 16 0 16 1 1 0 1 0 8 0
amappl14 184 5 0 5 1 1 0 1 0 8 0
amappl13 176 438 0 437 1 0 1 1 0 8 0
amappl12 168 1054 0 1014 3 0 3 3 0 8 0
amappl11 160 35 0 34 1 0 1 1 0 8 0
amappl10 152 78 0 64 1 0 1 1 0 8 0
amappl9 144 251 0 251 1 1 0 1 0 8 0
amappl8 136 45 0 43 1 0 1 1 0 8 0
amappl7 128 114 0 113 1 0 1 1 0 8 0
amappl6 120 289 0 276 1 0 1 1 0 8 0
amappl5 112 142 0 132 1 0 1 1 0 8 0
amappl4 104 451 0 422 1 0 1 1 0 8 0
amappl3 96 2712 0 2615 4 1 3 3 0 8 0
amappl2 88 807 0 735 2 0 2 2 0 8 0
amappl1 80 10710 0 10139 15 1 14 15 0 8 0
amappl 88 4541 0 4361 5 0 5 5 0 92 0
uvmvnodes 80 107 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 254 0 254 2 1 1 1 0 8 1
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 12 0 1 1 0 1 1 0 8 0
uaddrrnd 24 684 0 653 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 684 0 653 1 0 1 1 0 8 0
vmmpekpl 168 7567 0 7523 3 0 3 3 0 8 0
vmmpepl 168 52026 0 49909 98 0 98 98 0 357 0
vmsppl 488 683 0 653 5 0 5 5 0 8 0
rwobjpl 80 17704 0 16455 27 0 27 27 0 8 0
pdppl 4096 1379 0 1309 98 24 74 85 0 8 4
pvpl 32 18998 0 0 154 0 154 154 0 265 0
pmappl 256 685 0 654 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 279 0 26 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505
end trace frame: 0x0, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff83878ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x38 sys/dev/kcov.c:-1
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83970900) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
reaper(ffff8000ffffd9f8) at reaper+0x211 sys/kern/kern_exit.c:505
end trace frame: 0x0, count: -6
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x25: addq $0x8,%rsp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: 3
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833b5a1c) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_checkorder(ffff800001598878,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854
rw_do_enter_read(ffff800001598860,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline]
in6_hasmulti(fffffd80764690f0,ffff800001598800) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150
ip6_output(fffffd8076469000,ffffffff83987338,0,0,ffff80002a1fe840,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507
mld6_sendpkt(ffff8000015a9580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499
mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline]
mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369
pffasttimo(ffffffff83a152a8) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1
timeout_run(ffffffff8383b068,ffffffff83a152a8) at timeout_run+0x159 sys/kern/kern_timeout.c:698
softclock_thread_run(ffffffff8383b068) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842
softclock_thread_mp(ffff8000ffffe298) at softclock_thread_mp+0x86
end trace frame: 0x0, count: -12
---
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