panic: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*482391 22645 -1 0x40009010 0xc080000 0 syz-executor
441236 39268 0 0x14000 0x200 1 reaper
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, count: 7
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: kernel diagnostic assertion "ISSET(p->p_flag, P_SUSPSIG | P_SUSPSINGLE) == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_sig.c", line 1602
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, count: -8
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003339fff0
rbx 0xffffffff83999e07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff8000fffe6fc0
rax 0xffffffff83998ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x1ada5ff2a661ad7a
r11 0xbd51997d2ba702dd
r12 0xffffffff83999c08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff8279a8d5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003339ffe0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=482391 pid=22645 tcnt=2 stat=onproc
flags process=40009010<SUGID,SINGLEEXIT,STOPPING,STOPPED> proc=c080000<SUSPSINGLE,THREAD,SUSPSIG>
runpri=56, usrpri=54, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0xffff8000fffe6d28 scnt=1 ecnt=1
forw=0xffffffffffffffff, list=0xffff8000fffe62c8,0xffff8000fffe6d38
process=0xffff8000fffe1838 user=0xffff80003339b000, vmspace=0xfffff5806c3dc208
estcpu=4, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
92156 238183 18350 0 2 0 syz-executor
92156 84203 18350 0 3 0x4000080 fsleep syz-executor
38795 507414 30859 0 2 0 syz-executor
38795 326263 30859 0 2 0x4000000 syz-executor
46927 264333 69848 0 3 0x3000 suspend syz-executor
46927 433271 69848 0 3 0x4081000 fltagain2 syz-executor
75218 486110 54706 -1 2 0x10 syz-executor
75218 87565 54706 -1 3 0x4000090 fsleep syz-executor
75218 36046 54706 -1 3 0x4000090 fsleep syz-executor
75218 100071 54706 -1 3 0x4000090 fsleep syz-executor
*22645 482391 64418 -1 7 0x4c089010 syz-executor
22645 212380 64418 -1 3 0x4400b010 suspend syz-executor
23199 293122 0 0 3 0x14280 nfsidl nfsio
98236 380992 0 0 3 0x14280 nfsidl nfsio
52918 292512 0 0 3 0x14280 nfsidl nfsio
91105 341987 0 0 3 0x14280 nfsidl nfsio
81874 140110 0 0 3 0x14280 nfsidl nfsio
88933 367901 0 0 3 0x14280 nfsidl nfsio
49898 198105 0 0 3 0x14280 nfsidl nfsio
26964 159523 0 0 3 0x14280 nfsidl nfsio
77822 191967 0 0 3 0x14280 nfsidl nfsio
75171 229243 0 0 3 0x14280 nfsidl nfsio
40346 277014 0 0 3 0x14280 nfsidl nfsio
58849 317982 0 0 3 0x14280 nfsidl nfsio
41697 281298 0 0 3 0x14280 nfsidl nfsio
5854 256036 0 0 3 0x14280 nfsidl nfsio
69959 1767 0 0 3 0x14280 nfsidl nfsio
45682 478997 0 0 3 0x14280 nfsidl nfsio
65774 273713 0 0 3 0x14280 nfsidl nfsio
6050 227540 0 0 3 0x14280 nfsidl nfsio
20370 142183 0 0 3 0x14280 nfsidl nfsio
97020 20849 0 0 3 0x14280 nfsidl nfsio
18350 163722 2869 0 3 0x82 nanoslp syz-executor
16942 41226 2869 0 2 0x10000c82 syz-executor
64418 100976 2869 0 3 0x82 wait syz-executor
54706 8419 2869 0 2 0xc82 syz-executor
88111 151935 2869 0 3 0x82 wait syz-executor
30859 480693 2869 0 3 0x82 nanoslp syz-executor
69848 518093 2869 0 2 0x2 syz-executor
9235 500398 2869 0 2 0x2 syz-executor
2869 491684 84560 0 3 0x82 kqread syz-executor
84560 191645 79884 0 3 0x10008a sigsusp ksh
79884 490742 81477 0 3 0x98 kqread sshd-session
81477 521387 57150 0 3 0x92 kqread sshd-session
88743 236402 1 0 3 0x100083 ttyin getty
57150 30210 1 0 3 0x88 kqread sshd
63140 423696 86385 74 3 0x1100092 bpf pflogd
86385 277305 1 0 3 0x80 sbwait pflogd
33424 176354 53260 73 3 0x1100090 kqread syslogd
53260 516558 1 0 3 0x100082 sbwait syslogd
3910 183147 1 0 3 0x100080 kqread resolvd
72975 192210 53159 77 3 0x100092 kqread dhcpleased
38066 244755 53159 77 3 0x100092 kqread dhcpleased
53159 368250 1 0 3 0x80 kqread dhcpleased
41662 254147 0 0 3 0x14200 bored smr
15464 314623 0 0 2 0x14200 zerothread
88447 81596 0 0 3 0x14200 aiodoned aiodoned
8783 155752 0 0 3 0x14200 syncer update
20981 304765 0 0 3 0x14200 cleaner cleaner
39268 441236 0 0 7 0x14200 reaper
99605 97148 0 0 3 0x14200 pgdaemon pagedaemon
17605 409769 0 0 3 0x14200 bored viomb
19991 490163 0 0 3 0x40014200 acpi0 acpi0
2394 394572 0 0 3 0x40014200 idle1
7840 187829 0 0 3 0x14200 bored softnet1
88493 272138 0 0 3 0x14200 bored softnet0
24926 217198 0 0 3 0x14200 bored systqmp
21189 274916 0 0 3 0x14200 bored systq
31757 298205 0 0 3 0x14200 tmoslp softclockmp
51254 263274 0 0 3 0x40014200 tmoslp softclock
24313 493036 0 0 3 0x40014200 idle0
1 402183 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &sched_lock r = 0 (0xffffffff83aaa738)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 cursig+0x4ee sys/kern/kern_sig.c:1444
#3 userret+0x203 sys/kern/kern_sig.c:2207
#4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
#4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
#5 Xsyscall+0x128
exclusive mutex &pr->ps_mtx r = 0 (0xffff8000fffe1950)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 cursig+0x4c2 sys/kern/kern_sig.c:1440
#3 userret+0x203 sys/kern/kern_sig.c:2207
#4 syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
#4 syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
#5 Xsyscall+0x128
Process 9235 (syz-executor) thread 0xffff80002a222010 (500398)
exclusive rrwlock inode r = 0 (0xfffff58072bcc7b8)
#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:576
#5 vget+0x2a2 sys/kern/vfs_subr.c:686
#6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff580728d70b0)
#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:576
#5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1806
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11057 12093K 13131K 166960K 12385 0
pcb 18 13K 14K 166960K 73 0
rtable 230 7K 10K 166960K 372 0
pf 35 17K 24K 166960K 84 0
ifaddr 42 7K 7K 166960K 47 0
ifgroup 55 2K 2K 166960K 59 0
sysctl 3 1K 9K 166960K 8 0
counters 70 37K 37K 166960K 76 0
ioctlops 0 0K 4K 166960K 1498 0
iov 0 0K 1K 166960K 2 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1328 84K 84K 166960K 1463 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 5 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 15 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 93K 166960K 216 0
sigio 0 0K 0K 166960K 1 0
proc 72 115K 164K 166960K 557 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 1 0K 0K 166960K 46 0
in_multi 95 7K 7K 166960K 100 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 10 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 61 281K 281K 166960K 61 0
exec 0 0K 1K 166960K 387 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 235 175K 185K 166960K 3765 0
UVM aobj 6 2K 2K 166960K 8 0
pinsyscall 41 82K 103K 166960K 1372 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 12 0K 2K 166960K 30 0
temp 35 9110K 9158K 166960K 5877 0
kqueue 13 20K 26K 166960K 43 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 40 0 35 1 0 1 1 0 8 0
rtentry 176 112 0 7 5 0 5 5 0 8 0
unpcb 144 96 0 76 2 0 2 2 0 8 1
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 60 0 56 4 0 4 4 0 8 3
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 196 0 186 7 0 7 7 0 8 6
nd6 152 24 0 2 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 3 0 3 1 0 1 1 0 8 1
pfstscr 40 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
pfrktable 1344 7 0 7 1 0 1 1 0 8 1
pfstlim 224 1 0 1 1 0 1 1 0 8 1
pfanchor 1288 11 0 2 1 0 1 1 0 8 0
pftag 88 2 0 2 1 0 1 1 0 8 1
pfstitem 24 24 0 0 1 0 1 1 0 8 0
pfstkey 128 26 0 2 1 0 1 1 0 8 0
pfstate 448 25 0 1 3 0 3 3 0 8 0
pfrule 1360 22 0 17 2 1 1 2 0 8 0
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 16 29 0 29 29 0 8 0
art_table 40 453 0 16 5 0 5 5 0 8 0
art_node 32 112 0 16 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1
semupl 112 2 0 2 1 0 1 1 0 8 1
semapl 72 13 0 5 1 0 1 1 0 8 0
shmpl 112 5 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1716 0 247 93 0 93 93 0 8 0
ffsino 296 1716 0 247 114 0 114 114 0 8 0
nchpl 144 2024 0 318 64 0 64 64 0 8 0
vnodes 216 1879 0 0 105 0 105 105 0 8 0
namei 1024 6382 0 6382 2 0 2 2 0 8 2
percpumem 16 53 0 3 1 0 1 1 0 8 0
pfiaddrpl 120 2 0 2 1 0 1 1 0 8 1
kstatmem 264 31 0 4 2 0 2 2 0 8 0
scsiplug 72 2 0 2 1 0 1 1 0 8 1
scxspl 216 7279 0 7279 3 2 1 2 1 8 1
plimitpl 152 76 0 58 1 0 1 1 0 8 0
sigapl 424 553 0 486 8 0 8 8 0 8 0
knotepl 120 310 0 0 10 0 10 10 0 8 0
kqueuepl 224 83 0 73 3 0 3 3 0 8 2
pipepl 344 134 0 107 3 0 3 3 0 8 0
fdescpl 528 517 0 487 3 0 3 3 0 8 0
filepl 160 2273 0 2047 13 0 13 13 0 8 3
lockfpl 104 62 0 58 1 0 1 1 0 8 0
lockfspl 48 30 0 26 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 33 0 16 1 0 1 1 0 8 0
ucredpl 104 224 0 209 1 0 1 1 0 8 0
zombiepl 144 489 0 486 1 0 1 1 0 8 0
processpl 1232 553 0 486 6 0 6 6 0 8 0
procpl 664 726 0 651 8 0 8 8 0 8 1
sockpl 752 332 0 297 11 0 11 11 0 8 7
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 1 0 0 1 0 1 1 0 8 0
mcl4k 4096 127 0 0 16 0 16 16 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mtagpl 96 4 0 0 1 0 1 1 0 8 0
mbufpl 256 259 0 0 17 0 17 17 0 8 0
bufpl 272 2668 0 106 171 0 171 171 0 8 0
anonpl 32 7454 0 0 61 0 61 61 0 246 0
amapchunkpl 152 10690 0 10228 22 0 22 22 0 158 1
amappl16 200 2228 0 2202 15 1 14 15 0 8 10
amappl15 192 7 0 7 1 1 0 1 0 8 0
amappl14 184 435 0 433 1 0 1 1 0 8 0
amappl13 176 125 0 113 1 0 1 1 0 8 0
amappl12 168 768 0 739 2 0 2 2 0 8 0
amappl11 160 6 0 6 1 1 0 1 0 8 0
amappl10 152 66 0 52 1 0 1 1 0 8 0
amappl9 144 276 0 276 1 1 0 1 0 8 0
amappl8 136 96 0 94 1 0 1 1 0 8 0
amappl7 128 146 0 133 1 0 1 1 0 8 0
amappl6 120 155 0 154 1 0 1 1 0 8 0
amappl5 112 96 0 86 1 0 1 1 0 8 0
amappl4 104 286 0 268 1 0 1 1 0 8 0
amappl3 96 2005 0 1899 4 0 4 4 0 8 0
amappl2 88 540 0 479 2 0 2 2 0 8 0
amappl1 80 10777 0 10172 15 0 15 15 0 8 2
amappl 88 3036 0 2875 5 0 5 5 0 92 0
uvmvnodes 80 105 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 128 253 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 7 0 2 1 0 1 1 0 8 0
uaddrrnd 24 517 0 487 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 517 0 487 1 0 1 1 0 8 0
vmmpekpl 168 6309 0 6277 2 0 2 2 0 8 0
vmmpepl 168 42494 0 40631 95 0 95 95 0 357 8
vmsppl 488 516 0 487 5 0 5 5 0 8 1
rwobjpl 80 15900 0 14874 27 0 27 27 0 8 2
pdppl 4096 1041 0 974 99 28 71 85 0 8 4
pvpl 32 15173 0 0 123 0 123 123 0 265 0
pmappl 256 516 0 487 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 453 0 32 13 0 13 13 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834bad2d) at panic+0x1e5 sys/kern/subr_prf.c:198
__assert(ffffffff834f8f1c,ffffffff8346128c,642,ffffffff8344329e) at __assert+0x29 sys/kern/subr_prf.c:-1
process_stop(ffff8000fffe1838,8000000,1) at process_stop+0x3fe
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 x86_atomic_setbits_u32 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 [inline]
cursig(ffff8000fffe6fc0,ffff8000333a01d8,0) at cursig+0x509 sys/kern/kern_sig.c:1445
userret(ffff8000fffe6fc0) at userret+0x203 sys/kern/kern_sig.c:2207
syscall(ffff8000333a0310) at syscall+0x9ce mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000333a0310) at syscall+0x9ce sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x163ad84b30, count: -8
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153
mtx_leave(ffffffff839baaa0) at mtx_leave+0x28 sys/kern/kern_lock.c:-1
msleep_nsec(ffffffff839baad8,ffffffff839baaa0,4,ffffffff834ccf90,ffffffffffffffff) at msleep_nsec+0x19b sys/kern/kern_synch.c:202
reaper(ffff8000ffffd760) at reaper+0x15b sys/kern/kern_exit.c:477
end trace frame: 0x0, count: 8
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153
mtx_leave(ffffffff839baaa0) at mtx_leave+0x28 sys/kern/kern_lock.c:-1
msleep_nsec(ffffffff839baad8,ffffffff839baaa0,4,ffffffff834ccf90,ffffffffffffffff) at msleep_nsec+0x19b sys/kern/kern_synch.c:202
reaper(ffff8000ffffd760) at reaper+0x15b sys/kern/kern_exit.c:477
end trace frame: 0x0, count: -7