panic: amap_pp_adjref: negative reference count
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
305237 93699 0 0x2 0 1 syz-executor
*494914 56744 0 0x2 0 0K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83519dac) at panic+0x1e5 sys/kern/subr_prf.c:198
amap_pp_adjref(fffffd806eaf5638,0,7ff,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:883
amap_adjref_anons(fffffd806eaf5638,0,7ff,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298
uvm_mapent_clone(fffffd806c93b020,7e7d4a6b5000,7ff000,0,3,7,c7f05f7af9112870,fffffd806ccdbbf0,ffff80003c3e9ae8,fffffd806c93b020) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503
uvm_mapent_forkcopy(1,fffffd806c93b020,fffffd800b063988,fffffd806ccdbbf0,ffff80003c3e9ae8) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573
uvmspace_fork(ffff80003c3de1d0) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776
process_new(ffff8000ffffc538,ffff80003c3de1d0,1) at process_new+0x583 sys/kern/kern_fork.c:282
fork1(ffff80003c3dbcb0,1,ffffffff831f0b40,0,ffff80003c3e9cc0,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1
syscall(ffff80003c3e9d70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e9d70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e7d4aeb4310, count: 4
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: amap_pp_adjref: negative reference count
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83519dac) at panic+0x1e5 sys/kern/subr_prf.c:198
amap_pp_adjref(fffffd806eaf5638,0,7ff,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:883
amap_adjref_anons(fffffd806eaf5638,0,7ff,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298
uvm_mapent_clone(fffffd806c93b020,7e7d4a6b5000,7ff000,0,3,7,c7f05f7af9112870,fffffd806ccdbbf0,ffff80003c3e9ae8,fffffd806c93b020) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503
uvm_mapent_forkcopy(1,fffffd806c93b020,fffffd800b063988,fffffd806ccdbbf0,ffff80003c3e9ae8) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573
uvmspace_fork(ffff80003c3de1d0) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776
process_new(ffff8000ffffc538,ffff80003c3de1d0,1) at process_new+0x583 sys/kern/kern_fork.c:282
fork1(ffff80003c3dbcb0,1,ffffffff831f0b40,0,ffff80003c3e9cc0,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1
syscall(ffff80003c3e9d70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e9d70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e7d4aeb4310, count: -11
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003c3e97b0
rbx 0xffffffff83936e07 cpu_info_full_primary+0x2e07
rdx 0
rcx 0xffff80003c3dbcb0
rax 0xffffffff83935ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xf733b7fc79d6c7aa
r11 0x890d3cdea6b03a01
r12 0xffffffff83936c08 cpu_info_full_primary+0x2c08
r13 0
r14 0
r15 0x1
rip 0xffffffff8308f6e5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003c3e97a0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=494914 pid=56744 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c3dad20,0xffff80003c3db260
process=0xffff80003c3de1d0 user=0xffff80003c3e4000, vmspace=0xfffffd800b063988
estcpu=36, cpticks=12702, pctcpu=20.51, user=0, sys=12681, intr=21
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
47255 356798 39502 0 2 0 syz-executor
55914 87260 5105 0 2 0x40 syz-executor
93699 305237 39502 0 7 0x2 syz-executor
18945 86490 99100 0 2 0x2 sh
9600 97758 39502 0 2 0x2 syz-executor
99100 423760 30957 0 3 0x80 wait syz-executor
5105 207980 39410 0 3 0x80 ppwait syz-executor
*56744 494914 39502 0 7 0x2 syz-executor
15873 333965 39502 0 2 0x2 syz-executor
39410 217785 39502 0 3 0x82 wait syz-executor
30957 181962 39502 0 3 0x82 wait syz-executor
24859 412121 1 32767 2 0x10 syz-executor
24859 445200 1 32767 3 0x4000090 lockf syz-executor
19109 184785 39502 0 3 0x82 wait syz-executor
39502 171343 95407 0 2 0xc82 syz-executor
95407 248029 89445 0 3 0x10008a sigsusp ksh
89445 138427 22063 0 3 0x98 kqread sshd-session
22063 91844 86982 0 3 0x92 kqread sshd-session
19598 94366 1 0 3 0x100083 ttyin getty
86982 513598 1 0 3 0x88 kqread sshd
41953 13903 63935 73 2 0x1100c90 syslogd
63935 237406 1 0 3 0x100082 sbwait syslogd
1555 109611 1 0 3 0x100080 kqread resolvd
49375 348997 57915 77 3 0x100092 kqread dhcpleased
36606 56195 57915 77 3 0x100092 kqread dhcpleased
57915 39643 1 0 3 0x80 kqread dhcpleased
31366 272344 0 0 2 0x14200 smr
25125 172206 0 0 2 0x14200 zerothread
571 340098 0 0 3 0x14200 aiodoned aiodoned
59180 114925 0 0 2 0x14e00 update
34530 247119 0 0 3 0x14200 cleaner cleaner
90380 18770 0 0 3 0x14200 reaper reaper
18965 431799 0 0 3 0x14200 pgdaemon pagedaemon
54486 524228 0 0 3 0x14200 bored viomb
97072 341253 0 0 3 0x40014200 acpi0 acpi0
78198 156460 0 0 3 0x40014200 idle1
90063 520907 0 0 3 0x14200 bored softnet1
69342 322181 0 0 2 0x14200 softnet0
93236 385358 0 0 3 0x14200 smrbar systqmp
40544 77164 0 0 3 0x14200 bored systq
33686 301065 0 0 2 0x14200 softclockmp
39660 62007 0 0 2 0x40014200 softclock
60884 388613 0 0 3 0x40014200 idle0
1 141987 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 47255 (syz-executor) thread 0xffff80003c3daa88 (356798)
shared rwlock vmmaplk r = 0 (0xfffffd80735ac4e8)
#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 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
Process 56744 (syz-executor) thread 0xffff80003c3dbcb0 (494914)
exclusive rwlock amaplk r = 0 (0xfffffd8066946908)
#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 amap_ref+0x3c sys/uvm/uvm_amap.c:1312
#3 uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503
#4 uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573
#5 uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776
#6 process_new+0x583 sys/kern/kern_fork.c:282
#7 fork1+0x3f6 sys/kern/kern_fork.c:-1
#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
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b00300)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
#2 sleep_finish+0x2d8 sys/kern/kern_synch.c:369
#3 rw_do_enter_write+0x1dc sys/kern/kern_rwlock.c:298
#4 uvn_reference+0x2b sys/uvm/uvm_vnode.c:272
#5 uvm_mapent_clone+0x206 sys/uvm/uvm_map.c:3506
#6 uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573
#7 uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776
#8 process_new+0x583 sys/kern/kern_fork.c:282
#9 fork1+0x3f6 sys/kern/kern_fork.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd806c93b120)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171
#3 uvmspace_fork+0x12b sys/uvm/uvm_map.c:3752
#4 process_new+0x583 sys/kern/kern_fork.c:282
#5 fork1+0x3f6 sys/kern/kern_fork.c:-1
#6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd800b063a88)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171
#3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3743
#4 process_new+0x583 sys/kern/kern_fork.c:282
#5 fork1+0x3f6 sys/kern/kern_fork.c:-1
#6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
Process 93236 (systqmp) thread 0xffff8000ffffe298 (385358)
shared rwlock systqmp r = 0 (0xffffffff839152f8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11049 12016K 12034K 166960K 12143 0
pcb 17 12K 12K 166960K 17 0
rtable 215 6K 7K 166960K 348 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 5 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 31 0
iov 0 0K 2K 166960K 3 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1322 83K 83K 166960K 1416 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 3 0K 0K 166960K 3 0
dirhash 15 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 22 75K 125K 166960K 214 0
sigio 0 0K 0K 166960K 3 0
proc 58 99K 163K 166960K 508 0
subproc 86 5K 6K 166960K 131 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 8 0
in_multi 88 6K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 4 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 370 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 233 191K 207K 166960K 3363 0
UVM aobj 3 2K 2K 166960K 4 0
pinsyscall 43 86K 115K 166960K 1291 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 1 0
NDP 12 0K 2K 166960K 27 0
temp 51 9115K 9119K 166960K 3962 0
kqueue 14 22K 26K 166960K 32 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 37 0 32 1 0 1 1 0 8 0
rtentry 176 111 0 12 5 0 5 5 0 8 0
unpcb 144 191 0 176 6 0 6 6 0 8 5
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 19 0 15 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 92 0 85 2 0 2 2 0 8 1
nd6 152 24 0 3 1 0 1 1 0 8 0
kcovpl 48 14 0 5 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1
semapl 72 1 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 1 1 0 1 1 0 8 1
dirhash 1024 19 0 0 3 0 3 3 0 8 0
dino2pl 256 1619 0 146 93 0 93 93 0 8 0
ffsino 296 1619 0 146 114 0 114 114 0 8 0
nchpl 144 1865 0 163 64 0 64 64 0 8 0
vnodes 216 1759 0 0 98 0 98 98 0 8 0
namei 1024 5546 0 5546 1 0 1 1 0 8 1
percpumem 16 50 0 1 1 0 1 1 0 8 0
kstatmem 264 25 0 2 2 0 2 2 0 8 0
scxspl 216 6414 0 6414 4 1 3 3 1 8 3
plimitpl 152 58 0 32 2 0 2 2 0 8 0
sigapl 424 488 0 437 7 0 7 7 0 8 1
knotepl 120 323 0 0 10 0 10 10 0 8 0
kqueuepl 224 33 0 23 1 0 1 1 0 8 0
pipepl 344 153 0 122 4 0 4 4 0 8 0
fdescpl 528 472 0 438 4 0 4 4 0 8 1
filepl 160 1876 0 1648 15 0 15 15 0 8 4
lockfpl 104 23 0 19 1 0 1 1 0 8 0
lockfspl 48 10 0 7 1 0 1 1 0 8 0
sessionpl 144 31 0 14 1 0 1 1 0 8 0
pgrppl 48 48 0 24 1 0 1 1 0 8 0
ucredpl 104 161 0 143 1 0 1 1 0 8 0
zombiepl 144 444 0 437 1 0 1 1 0 8 0
processpl 1232 488 0 437 5 0 5 5 0 8 0
procpl 664 571 0 519 6 0 6 6 0 8 0
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 752 321 0 294 17 0 17 17 0 8 13
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 121 0 0 16 0 16 16 0 8 0
mcl2k 2048 29 0 0 4 0 4 4 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 231 0 0 15 0 15 15 0 8 0
bufpl 280 2280 0 102 156 0 156 156 0 8 0
anonpl 32 7429 0 0 60 0 60 60 0 246 0
amapchunkpl 152 9172 0 8699 24 0 24 24 0 158 0
amappl16 200 1405 0 1387 14 0 14 14 0 8 12
amappl15 192 1 0 1 1 0 1 1 0 8 1
amappl14 184 403 0 402 1 0 1 1 0 8 0
amappl13 176 111 0 101 1 0 1 1 0 8 0
amappl12 168 702 0 675 2 0 2 2 0 8 0
amappl11 160 7 0 7 1 0 1 1 0 8 1
amappl10 152 86 0 76 1 0 1 1 0 8 0
amappl9 144 270 0 269 1 0 1 1 0 8 0
amappl8 136 89 0 88 1 0 1 1 0 8 0
amappl7 128 135 0 124 1 0 1 1 0 8 0
amappl6 120 169 0 167 1 0 1 1 0 8 0
amappl5 112 105 0 98 1 0 1 1 0 8 0
amappl4 104 265 0 248 1 0 1 1 0 8 0
amappl3 96 1686 0 1582 5 1 4 4 0 8 0
amappl2 88 521 0 468 2 0 2 2 0 8 0
amappl1 80 10303 0 9751 14 0 14 14 0 8 1
amappl 88 2683 0 2516 5 0 5 5 0 92 0
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 3 0 1 1 0 1 1 0 8 0
uaddrrnd 24 472 0 438 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 472 0 438 1 0 1 1 0 8 0
vmmpekpl 168 5774 0 5712 3 0 3 3 0 8 0
vmmpepl 168 38971 0 37108 102 0 102 102 0 357 14
vmsppl 488 471 0 438 7 1 6 6 0 8 1
rwobjpl 80 14149 0 13147 25 0 25 25 0 8 3
pdppl 4096 951 0 876 109 22 87 99 0 8 12
pvpl 32 14998 0 0 122 1 121 121 0 265 0
pmappl 256 471 0 438 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 282 0 25 8 0 8 8 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(ffffffff83519dac) at panic+0x1e5 sys/kern/subr_prf.c:198
amap_pp_adjref(fffffd806eaf5638,0,7ff,1) at amap_pp_adjref+0x74c sys/uvm/uvm_amap.c:883
amap_adjref_anons(fffffd806eaf5638,0,7ff,1,0) at amap_adjref_anons+0x22d sys/uvm/uvm_amap.c:1298
uvm_mapent_clone(fffffd806c93b020,7e7d4a6b5000,7ff000,0,3,7,c7f05f7af9112870,fffffd806ccdbbf0,ffff80003c3e9ae8,fffffd806c93b020) at uvm_mapent_clone+0x17e sys/uvm/uvm_map.c:3503
uvm_mapent_forkcopy(1,fffffd806c93b020,fffffd800b063988,fffffd806ccdbbf0,ffff80003c3e9ae8) at uvm_mapent_forkcopy+0x6f sys/uvm/uvm_map.c:3573
uvmspace_fork(ffff80003c3de1d0) at uvmspace_fork+0x299 sys/uvm/uvm_map.c:3776
process_new(ffff8000ffffc538,ffff80003c3de1d0,1) at process_new+0x583 sys/kern/kern_fork.c:282
fork1(ffff80003c3dbcb0,1,ffffffff831f0b40,0,ffff80003c3e9cc0,0) at fork1+0x3f6 sys/kern/kern_fork.c:-1
syscall(ffff80003c3e9d70) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3e9d70) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7e7d4aeb4310, count: -11
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
__mp_lock(ffffffff83affb00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83affb00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
syscall(ffff80003c3d3450) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003c3d3450) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f9a7525d890, 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
__mp_lock(ffffffff83affb00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83affb00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
syscall(ffff80003c3d3450) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003c3d3450) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6f9a7525d890, count: -7