syzbot
KASAN: invalid memory access in mrt6_ioctl
Status:
fixed on 2026/10/04 11:05
Reported-by: syzbot+3663887fe1e137621ce0@syzkaller.appspotmail.com
Fix commit:
d11e486715c5
Make IPv6 multicast router global variable MP safe.
First crash: 63d, last: 41d
Sample crash report:
panic: Caught invalid memory access at ffff8000017d4e08 size 4 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 98161 30916 0 0 0x4000000 0K syz-executor
268412 23138 0 0x2 0 1 syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846431fb) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff8000017d4e08) at __asan_load4_noabort+0xa3
mrt6_ioctl(ffff800001c445f8,c028756b,ffff8000299d24f0) at mrt6_ioctl+0x125 sys/netinet6/ip6_mroute.c:242
sys_ioctl(ffff8000298f42a8,ffff8000299d2790,ffff8000299d2700) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff8000299d2790) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000299d2790) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdb4f140b0a0, count: 8
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: Caught invalid memory access at ffff8000017d4e08 size 4 op 0
ddb{0}> show kasan
KASAN: invalid read of 4 bytes at 0xffff8000017d4e08 from pc 0xffffffff8156d165
KASAN: first bad byte at 0xffff8000017d4e08 (+0); shadow 0xfd: pool use-after-free (or unallocated item)
KASAN: 0xffff8000017d4e08 is 312 bytes inside the 328-byte item [0xffff8000017d4cd0..0xffff8000017d4e18) in pool 'inpcb'
KASAN: allocated at:
#0 pool_get+0x770 sys/kern/subr_pool.c:834
#1 in_pcballoc+0x5f sys/netinet/in_pcb.c:-1
#2 tcp_attach+0x25d sys/netinet/tcp_usrreq.c:496
#3 socreate+0x3f1 pru_attach sys/sys/protosw.h:275 [inline]
#3 socreate+0x3f1 sys/kern/uipc_socket.c:220
#4 sys_socket+0x20f sys/kern/uipc_syscalls.c:102
#5 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
KASAN: freed at:
#0 pool_put+0x79 sys/kern/subr_pool.c:1019
#1 tcp_close+0x2b0 tcpstat_inc sys/netinet/tcp_var.h:-1 [inline]
#1 tcp_close+0x2b0 sys/netinet/tcp_subr.c:530
#2 tcp_usrclosed+0x122 sys/netinet/tcp_usrreq.c:1094
#3 tcp_shutdown+0x1c9 sys/netinet/tcp_usrreq.c:786
#4 soshutdown+0xd2 pru_shutdown sys/sys/protosw.h:327 [inline]
#4 soshutdown+0xd2 sys/kern/uipc_socket.c:1267
#5 sys_shutdown+0x17d sys/kern/uipc_syscalls.c:1187
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
#7 Xsyscall+0x128
KASAN: pc: mrt6_ioctl+0x125
KASAN: call trace:
#0 __asan_load4_noabort+0x82 kasan_shadow_check sys/kern/subr_kasan.c:1014 [inline]
#0 __asan_load4_noabort+0x82 sys/kern/subr_kasan.c:1098
#1 mrt6_ioctl+0x125 sys/netinet6/ip6_mroute.c:242
#2 sys_ioctl+0x868 sys/kern/sys_generic.c:510
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
#4 Xsyscall+0x128
KASAN: shadow of 0xffff8000017d4d00..0xffff8000017d4f80 (1 cell = 8 bytes):
0xffff8000017d4d00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0xffff8000017d4d80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
>0xffff8000017d4e00: fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0xffff8000017d4e80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0xffff8000017d4f00: fd fd fd fd fd fd fd fd fd fd fd fd 08 08 08 08
KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846431fb) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff8000017d4e08) at __asan_load4_noabort+0xa3
mrt6_ioctl(ffff800001c445f8,c028756b,ffff8000299d24f0) at mrt6_ioctl+0x125 sys/netinet6/ip6_mroute.c:242
sys_ioctl(ffff8000298f42a8,ffff8000299d2790,ffff8000299d2700) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff8000299d2790) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000299d2790) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdb4f140b0a0, count: -7
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000299d22b0
rbx 0xffff8000299d2320
rdx 0
rcx 0xffffffff85416ff0 cpu_info_full_primary+0x1ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff8000299d2098
r11 0xffffffff81b47ce0 x86_bus_space_io_read_1
r12 0xffffffff846431fb .str+0x9d3bb
r13 0xffffffff85417c10 cpu_info_full_primary+0x2c10
r14 0xffffffff85417e0f cpu_info_full_primary+0x2e0f
r15 0x1
rip 0xffffffff83f69c07 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff8000299d22b0
ss 0x10
db_enter+0x17: popq %rbp
ddb{0}> show proc
PROC (syz-executor) tid=98161 pid=30916 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=81, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000298f3770,0xffff8000298f4020
process=0xffff80003bb61d00 user=0xffff8000299c7000, vmspace=0xffff80000182a008
estcpu=31, cpticks=21, pctcpu=0.0, user=0, sys=21, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
42307 393597 28351 0 2 0x40 0 syz-executor
37747 324258 69322 0 2 0 0 syz-executor
22990 39144 7054 0 2 0 0 syz-executor
34844 239552 32912 0 2 0 0 syz-executor
34844 439480 32912 0 3 0 0x4000080 fsleep syz-executor
34844 125412 32912 0 3 0 0x4000080 kqread syz-executor
30916 280304 68747 0 2 0 0 syz-executor
30916 396366 68747 0 2 0 0x4000000 syz-executor
*30916 98161 68747 0 7 0 0x4000000 syz-executor
79862 435988 13324 0 2 0x10 0 syz-executor
79862 429567 13324 0 3 0x10 0x4000080 fsleep syz-executor
97852 153307 69046 0 2 0x2 0 syz-executor
15269 140118 23138 0 2 0 0xc80 syz-executor
15269 368584 23138 0 3 0 0x4000080 sbwait syz-executor
15269 477123 23138 0 3 0 0x4000080 sbwait syz-executor
15269 105339 23138 0 3 0 0x4000080 fsleep syz-executor
28351 401107 69046 0 3 0x82 0 ppwait syz-executor
68747 102589 69046 0 2 0x2 0xc80 syz-executor
69322 390194 69046 0 2 0x2 0xc80 syz-executor
32912 27650 69046 0 2 0x2 0xc80 syz-executor
23138 268412 69046 0 7 0x2 0 syz-executor
59117 86277 0 0 3 0x14000 0x200 acct acct
7054 327449 69046 0 2 0x2 0xc80 syz-executor
13324 56739 69046 0 2 0x2 0xc80 syz-executor
69046 78871 3365 0 2 0x2 0 syz-executor
3365 7355 42841 0 3 0x100002 0x88 sigsusp ksh
42841 313301 84609 0 3 0x10 0x88 kqread sshd-session
84609 481444 40942 0 3 0x12 0x80 kqread sshd-session
95414 429824 1 0 3 0x100003 0x80 ttyin getty
40942 216617 1 0 3 0 0x88 kqread sshd
32389 383504 29677 74 3 0x1100012 0x80 bpf pflogd
29677 519099 1 0 3 0 0x80 sbwait pflogd
86471 287643 77426 73 2 0x1100010 0x80 syslogd
77426 151673 1 0 3 0x100002 0x80 sbwait syslogd
3414 518384 1 0 3 0x100000 0x80 kqread resolvd
14331 262716 30860 77 3 0x100012 0x80 kqread dhcpleased
66707 407014 30860 77 3 0x100012 0x80 kqread dhcpleased
30860 407868 1 0 3 0 0x80 kqread dhcpleased
18279 292944 0 0 2 0x14000 0x200 smr
16584 408128 0 0 2 0x14000 0x200 zerothread
48620 299964 0 0 3 0x14000 0x200 aiodoned aiodoned
49016 460696 0 0 3 0x14000 0x200 syncer update
26223 67045 0 0 3 0x14000 0x200 cleaner cleaner
23867 323829 0 0 3 0x14000 0x200 reaper reaper
1045 300057 0 0 3 0x14000 0x200 pgdaemon pagedaemon
4631 435095 0 0 3 0x14000 0x200 bored viomb
83504 126703 0 0 3 0x14000 0x40000200 acpi0 acpi0
95840 496512 0 0 3 0x14000 0x40000200 idle1
85189 251784 0 0 3 0x14000 0x200 bored softnet1
45138 171306 0 0 3 0x14000 0x200 bored softnet0
6507 8594 0 0 3 0x14000 0x200 smrbar systqmp
46491 216891 0 0 3 0x14000 0x200 bored systq
83410 437162 0 0 2 0x14000 0x200 softclockmp
59820 372211 0 0 3 0x14000 0x40000200 tmoslp softclock
45495 260991 0 0 3 0x14000 0x40000200 idle0
1 508979 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
Process 30916 (syz-executor) thread 0xffff8000298f42a8 (98161)
shared rwlock netlock r = 0 (0xffffffff852e0018)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413
#2 mrt6_ioctl+0x10f sys/netinet6/ip6_mroute.c:242
#3 sys_ioctl+0x868 sys/kern/sys_generic.c:510
#4 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
#5 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff85def4c0)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 mrt6_ioctl+0x53 sys/netinet6/ip6_mroute.c:232
#2 sys_ioctl+0x868 sys/kern/sys_generic.c:510
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
#4 Xsyscall+0x128
Process 6507 (systqmp) thread 0xffff800045ffe000 (8594)
shared rwlock systqmp r = 0 (0xffffffff852ff5b8)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x1ba sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11054 12247K 12394K 166960K 12169 0
pcb 17 24K 24K 166960K 28 0
rtable 237 19K 31K 166960K 485 0
pf 34 22K 26K 166960K 57 0
ifaddr 43 12K 14K 166960K 67 0
ifgroup 55 2K 2K 166960K 79 0
sysctl 1 1K 13K 166960K 6 0
counters 70 42K 43K 166960K 82 0
ioctlops 3 1K 185K 166960K 1491 0
iov 0 0K 32K 166960K 65 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1302 84K 86K 166960K 1454 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 6K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 4 0K 0K 166960K 5 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 405K 166960K 12470 0
file desc 19 64K 121K 166960K 268 0
sigio 0 0K 0K 166960K 3 0
proc 143 131K 177K 166960K 693 0
subproc 77 9K 13K 166960K 122 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 89 6K 8K 166960K 150 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 8 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 37 263K 263K 166960K 37 0
exec 36 9K 16K 166960K 452 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 14 124K 124K 166960K 15 0
UVM amap 496 315K 366K 166960K 4024 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 163 280K 368K 166960K 1570 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 4 0
NDP 18 0K 2K 166960K 43 0
temp 456 9363K 9458K 166960K 5352 0
kqueue 14 44K 84K 166960K 36 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 28 0 0 1 0 1 1 0 8 0
rtpcb 120 44 0 41 1 0 1 1 0 8 0
rtentry 176 164 0 72 6 0 6 6 0 8 1
unpcb 144 89 0 69 1 0 1 1 0 8 0
syncache 336 4 0 4 2 1 1 1 0 8 1
tcpcb 736 16 0 12 1 0 1 1 0 8 0
arp 136 28 0 13 1 0 1 1 0 8 0
inpcb 328 132 0 124 2 0 2 2 0 8 1
nd6 152 38 0 19 1 0 1 1 0 8 0
kcovpl 48 13 0 6 1 0 1 1 0 8 0
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 41 0 0 1 0 1 1 0 8 0
pfstkey 128 41 0 0 2 0 2 2 0 8 0
pfstate 448 41 0 0 5 0 5 5 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 662 0 289 30 0 30 30 0 8 4
art_table 40 663 0 289 5 0 5 5 0 8 0
art_node 32 164 0 78 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 72 3 0 1 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1688 0 208 93 0 93 93 0 8 0
ffsino 296 1688 0 208 114 0 114 114 0 8 0
nchpl 144 1984 0 270 64 0 64 64 0 8 0
vnodes 216 1830 0 0 102 0 102 102 0 8 0
namei 1024 7456 0 7456 4 1 3 3 0 8 3
percpumem 16 57 0 7 1 0 1 1 0 8 0
kstatmem 264 39 0 14 2 0 2 2 0 8 0
scxspl 216 7298 0 7298 3 2 1 2 1 8 1
plimitpl 152 38 0 21 1 0 1 1 0 8 0
sigapl 424 583 0 535 7 0 7 7 0 8 1
knotepl 120 104 0 0 4 0 4 4 0 8 0
kqueuepl 224 66 0 56 3 0 3 3 0 8 2
pipepl 344 157 0 130 3 0 3 3 0 8 0
fdescpl 528 566 0 535 3 0 3 3 0 8 0
filepl 160 2139 0 1929 13 0 13 13 0 8 3
lockfpl 104 12 0 10 1 0 1 1 0 8 0
lockfspl 48 7 0 5 1 0 1 1 0 8 0
sessionpl 144 31 0 22 1 0 1 1 0 8 0
pgrppl 48 46 0 29 1 0 1 1 0 8 0
ucredpl 104 236 0 222 1 0 1 1 0 8 0
zombiepl 144 535 0 535 1 0 1 1 0 8 1
processpl 1232 583 0 535 5 0 5 5 0 8 1
procpl 664 704 0 648 6 0 6 6 0 8 0
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 752 269 0 237 5 0 5 5 0 8 1
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 136 0 0 17 0 17 17 0 8 0
mcl2k 2048 23 0 0 3 0 3 3 0 8 0
mextrefs 64 24 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 215 0 0 14 0 14 14 0 8 0
bufpl 272 2472 0 106 158 0 158 158 0 8 0
anonpl 32 3880 0 0 32 0 32 32 0 222 0
amapchunkpl 152 11234 0 10781 23 0 23 23 0 158 5
amappl16 200 2132 0 2113 5 2 3 5 0 8 1
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 493 0 492 1 0 1 1 0 8 0
amappl13 176 133 0 121 1 0 1 1 0 8 0
amappl12 168 836 0 807 2 0 2 2 0 8 0
amappl11 160 4 0 4 1 1 0 1 0 8 0
amappl10 152 64 0 50 1 0 1 1 0 8 0
amappl9 144 275 0 274 1 0 1 1 0 8 0
amappl8 136 128 0 125 1 0 1 1 0 8 0
amappl7 128 159 0 145 1 0 1 1 0 8 0
amappl6 120 230 0 229 1 0 1 1 0 8 0
amappl5 112 123 0 112 1 0 1 1 0 8 0
amappl4 104 327 0 309 1 0 1 1 0 8 0
amappl3 96 2049 0 1958 3 0 3 3 0 8 0
amappl2 88 675 0 599 2 0 2 2 0 8 0
amappl1 80 11428 0 10831 15 0 15 15 0 8 1
amappl 88 3199 0 3049 5 0 5 5 0 92 1
uvmvnodes 80 98 0 0 2 0 2 2 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 128 253 0 253 1 1 0 1 0 8 0
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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 566 0 535 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 566 0 535 1 0 1 1 0 8 0
vmmpekpl 168 6716 0 6680 3 0 3 3 0 8 0
vmmpepl 168 46214 0 44335 89 0 89 89 0 357 7
vmsppl 488 565 0 535 5 0 5 5 0 8 0
rwobjpl 80 16691 0 15682 25 0 25 25 0 8 0
pdppl 4096 1140 0 1070 104 26 78 86 0 8 8
pvpl 32 11122 0 0 92 2 90 90 0 265 0
pmappl 256 565 0 535 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 120 444 0 31 13 0 13 13 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846431fb) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff8000017d4e08) at __asan_load4_noabort+0xa3
mrt6_ioctl(ffff800001c445f8,c028756b,ffff8000299d24f0) at mrt6_ioctl+0x125 sys/netinet6/ip6_mroute.c:242
sys_ioctl(ffff8000298f42a8,ffff8000299d2790,ffff8000299d2700) at sys_ioctl+0x868 sys/kern/sys_generic.c:510
syscall(ffff8000299d2790) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000299d2790) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdb4f140b0a0, count: -7
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff85deecc0) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85deecc0) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff800033aef990) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff800033aef990) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x702f95dde550, count: 9
ddb{1}> trace
x86_ipi_db(ffff800028fe3ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff85deecc0) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85deecc0) at __mp_lock+0x272 sys/kern/kern_lock.c:173
syscall(ffff800033aef990) at syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff800033aef990) at syscall+0x1048 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x702f95dde550, count: -6
Struck through repros no longer work on HEAD.