uvpanic: freeing message queue with active references
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
107939 72389 0 0 0x4000000 0 syz-executor
*139465 93574 0 0 0x4000000 1K syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b13ba) at panic+0x1e5 sys/kern/subr_prf.c:198
que_free(ffff80000160a000) at que_free+0x15c
sys_msgctl(ffff8000fffe8fb0,ffff800037fb0380,ffff800037fb02d0) at sys_msgctl+0x4ae sys/kern/sysv_msg.c:129
syscall(ffff800037fb0380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037fb0380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8ab12ff7bd0, count: 9
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
*cpu0: uvm_fault(0xfffffd806c709b88, 0x98, 0, 1) -> e
cpu1: freeing message queue with active references
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b13ba) at panic+0x1e5 sys/kern/subr_prf.c:198
que_free(ffff80000160a000) at que_free+0x15c
sys_msgctl(ffff8000fffe8fb0,ffff800037fb0380,ffff800037fb02d0) at sys_msgctl+0x4ae sys/kern/sysv_msg.c:129
syscall(ffff800037fb0380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037fb0380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8ab12ff7bd0, count: -6
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800037fb00b0
rbx 0xffff8000299aee07
rdx 0xffff8000015f1e40
rcx 0xffff8000fffe8fb0
rax 0xffff8000299adff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xbf497cdbe549363
r11 0xad07f515c1749392
r12 0xffff8000299aec08
r13 0
r14 0xffffffff8388fc08 cpu_info_full_primary+0x2c08
r15 0x1
rip 0xffffffff81473b35 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff800037fb00a0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=139465 pid=93574 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=50, usrpri=50, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffe9ca8,0xffffffff839b2398
process=0xffff8000fffe5360 user=0xffff800037fab000, vmspace=0xfffffd806c709d70
estcpu=8, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
72389 501263 49173 0 2 0 syz-executor
72389 107939 49173 0 7 0x4000000 syz-executor
58049 177728 70831 60929 2 0x10 syz-executor
58049 178039 70831 60929 3 0x4000090 fsleep syz-executor
93574 24395 77348 0 2 0 syz-executor
93574 378925 77348 0 2 0x4000080 syz-executor
*93574 139465 77348 0 7 0x4000000 syz-executor
62675 439567 79851 0 3 0x80 nanoslp syz-executor
62675 428720 79851 0 3 0x4000080 fsleep syz-executor
62675 509441 79851 0 3 0x4000080 fsleep syz-executor
62675 162775 79851 0 3 0x4000080 lockf syz-executor
60674 76233 89542 0 3 0x81 nanoslp syz-executor
60674 250203 89542 0 3 0x4000081 ttyin syz-executor
60674 483978 89542 0 3 0x4000081 fsleep syz-executor
48327 125618 46980 0 3 0x80 nanoslp syz-executor
48327 113458 46980 0 3 0x4000080 sbwait syz-executor
48327 291208 46980 0 3 0x4000080 fsleep syz-executor
77348 356948 87199 0 3 0x82 nanoslp syz-executor
79851 360243 87199 0 3 0x82 nanoslp syz-executor
70831 297922 87199 0 3 0x82 nanoslp syz-executor
84418 239809 87199 0 3 0x2 biowait syz-executor
89542 198567 87199 0 3 0x82 nanoslp syz-executor
49173 367689 87199 0 3 0x82 nanoslp syz-executor
46980 391646 87199 0 3 0x82 nanoslp syz-executor
87532 101721 87199 0 3 0x82 nanoslp syz-executor
87199 100016 66970 0 3 0x82 kqread syz-executor
66970 446324 71695 0 3 0x10008a sigsusp ksh
71695 243315 74282 0 3 0x98 kqread sshd-session
74282 336408 10558 0 3 0x92 kqread sshd-session
43582 77455 1 0 3 0x100083 ttyin getty
10558 403204 1 0 3 0x88 kqread sshd
33032 174482 94088 74 3 0x1100092 bpf pflogd
94088 340571 1 0 3 0x80 sbwait pflogd
11433 255962 85401 73 3 0x1100090 kqread syslogd
85401 230099 1 0 3 0x100082 sbwait syslogd
10841 114723 1 0 3 0x100080 kqread resolvd
16443 258611 8431 77 3 0x100092 kqread dhcpleased
24985 218591 8431 77 3 0x100092 kqread dhcpleased
8431 101376 1 0 3 0x80 kqread dhcpleased
73964 64595 0 0 3 0x14200 pause smr
95246 398919 0 0 2 0x14200 zerothread
90025 197546 0 0 3 0x14200 aiodoned aiodoned
54599 23296 0 0 3 0x14200 syncer update
54000 479832 0 0 3 0x14200 cleaner cleaner
97873 202684 0 0 3 0x14200 reaper reaper
41594 130321 0 0 3 0x14200 pgdaemon pagedaemon
4225 282544 0 0 3 0x14200 bored viomb
76934 285679 0 0 3 0x40014200 acpi0 acpi0
53104 202604 0 0 3 0x40014200 idle1
78572 37900 0 0 3 0x14200 bored softnet1
27192 170443 0 0 3 0x14200 bored softnet0
84486 492121 0 0 3 0x14200 bored systqmp
19411 113535 0 0 3 0x14200 bored systq
25482 222916 0 0 3 0x14200 tmoslp softclockmp
81775 97262 0 0 3 0x40014200 tmoslp softclock
6891 345882 0 0 3 0x40014200 idle0
1 166195 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 72389 (syz-executor) thread 0xffff8000fffe9ca8 (107939)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a38200)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
Process 84418 (syz-executor) thread 0xffff80002a231ca0 (239809)
exclusive rrwlock inode r = 0 (0xfffffd806c67e560)
#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+0x98a sys/kern/vfs_lookup.c:567
#11 namei+0x7ca sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887
#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 (0xfffffd806d563680)
#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+0x11c sys/kern/vfs_lookup.c:-1
#6 namei+0x7ca sys/kern/vfs_lookup.c:250
#7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1887
#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{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11061 12084K 12453K 166960K 12303 0
pcb 17 12K 12K 166960K 45 0
rtable 222 7K 8K 166960K 359 0
pf 32 17K 21K 166960K 58 0
ifaddr 39 6K 7K 166960K 52 0
ifgroup 51 2K 2K 166960K 70 0
sysctl 1 1K 9K 166960K 6 0
counters 68 36K 37K 166960K 84 0
ioctlops 0 0K 4K 166960K 1604 0
iov 0 0K 16K 166960K 9 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1330 84K 84K 166960K 1497 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 20K 24K 166960K 7 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 20 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 89K 166960K 256 0
proc 72 115K 180K 166960K 566 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 0 0K 0K 166960K 24 0
in_multi 88 6K 7K 166960K 103 0
ether_multi 1 0K 0K 166960K 2 0
mrt 0 0K 0K 166960K 8 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 392 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 248 167K 175K 166960K 4122 0
UVM aobj 10 5K 5K 166960K 14 0
pinsyscall 42 84K 101K 166960K 1393 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 11 0K 2K 166960K 33 0
temp 37 9070K 9134K 166960K 9348 0
kqueue 13 20K 27K 166960K 49 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 41 0 38 1 0 1 1 0 8 0
rtentry 176 112 0 12 6 0 6 6 0 8 0
unpcb 144 85 0 66 1 0 1 1 0 8 0
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 38 0 33 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 159 0 150 2 0 2 2 0 8 0
nd6 152 25 0 3 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 0 1 1 0 8 1
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1192 5 0 5 1 0 1 1 0 8 1
pffrag 232 2 0 0 1 0 1 1 0 482 0
pffrnode 88 2 0 0 1 0 1 1 0 8 0
pffrent 40 2 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 1 0 0 1 0 1 1 0 8 0
pfstlim 224 1 0 1 1 0 1 1 0 8 1
pfstitem 24 24 0 1 1 0 1 1 0 8 0
pfstkey 128 24 0 1 1 0 1 1 0 8 0
pfstate 448 24 0 1 3 0 3 3 0 8 0
pfrule 1360 22 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 454 0 44 29 0 29 29 0 8 2
art_table 40 455 0 44 5 0 5 5 0 8 0
art_node 32 112 0 21 1 0 1 1 0 8 0
sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0
semupl 112 5 0 5 1 0 1 1 0 8 1
semapl 112 16 0 6 1 0 1 1 0 8 0
shmpl 112 11 0 4 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 1782 0 319 93 0 93 93 0 8 0
ffsino 296 1782 0 319 114 0 114 114 0 8 0
nchpl 144 2156 0 453 64 0 64 64 0 8 0
rtmask 32 2 0 2 1 0 1 1 0 8 1
vnodes 216 1961 0 0 109 0 109 109 0 8 0
namei 1024 7038 0 7038 1 0 1 1 0 8 1
percpumem 16 57 0 8 1 0 1 1 0 8 0
kstatmem 264 37 0 12 3 0 3 3 0 8 1
scxspl 216 7438 0 7437 9 1 8 8 1 8 7
plimitpl 152 33 0 15 1 0 1 1 0 8 0
sigapl 424 568 0 521 7 0 7 7 0 8 1
knotepl 120 298 0 0 10 0 10 10 0 8 0
kqueuepl 224 100 0 90 3 0 3 3 0 8 2
pipepl 344 131 0 103 3 0 3 3 0 8 0
fdescpl 528 552 0 521 3 0 3 3 0 8 0
filepl 160 2532 0 2264 13 0 13 13 0 8 1
lockfpl 104 131 0 122 1 0 1 1 0 8 0
lockfspl 48 23 0 18 1 0 1 1 0 8 0
sessionpl 144 91 0 81 1 0 1 1 0 8 0
pgrppl 48 99 0 81 1 0 1 1 0 8 0
ucredpl 104 225 0 211 1 0 1 1 0 8 0
zombiepl 144 522 0 521 1 0 1 1 0 8 0
processpl 1232 568 0 521 5 0 5 5 0 8 0
procpl 664 784 0 726 6 0 6 6 0 8 0
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 752 293 0 262 5 0 5 5 0 8 0
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 133 0 0 17 0 17 17 0 8 0
mcl2k 2048 18 0 0 3 0 3 3 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 131 0 0 9 0 9 9 0 8 0
bufpl 280 2561 0 105 176 0 176 176 0 8 0
anonpl 32 5546 0 0 45 0 45 45 0 246 0
amapchunkpl 152 12464 0 11952 27 0 27 27 0 158 5
amappl16 200 1728 0 1695 5 2 3 5 0 8 1
amappl15 192 6 0 6 1 1 0 1 0 8 0
amappl14 184 428 0 427 1 0 1 1 0 8 0
amappl13 176 117 0 105 1 0 1 1 0 8 0
amappl12 168 797 0 767 2 0 2 2 0 8 0
amappl11 160 1 0 1 1 1 0 1 0 8 0
amappl10 152 68 0 54 1 0 1 1 0 8 0
amappl9 144 263 0 263 1 1 0 1 0 8 0
amappl8 136 107 0 105 1 0 1 1 0 8 0
amappl7 128 147 0 134 1 0 1 1 0 8 0
amappl6 120 159 0 158 1 0 1 1 0 8 0
amappl5 112 95 0 84 1 0 1 1 0 8 0
amappl4 104 284 0 263 1 0 1 1 0 8 0
amappl3 96 2237 0 2120 4 0 4 4 0 8 0
amappl2 88 519 0 458 2 0 2 2 0 8 0
amappl1 80 9738 0 9133 15 0 15 15 0 8 2
amappl 88 3396 0 3222 5 0 5 5 0 92 0
uvmvnodes 80 104 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 28 0 28 2 1 1 1 0 8 1
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 13 0 4 1 0 1 1 0 8 0
uaddrrnd 24 552 0 521 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 552 0 521 1 0 1 1 0 8 0
vmmpekpl 168 6186 0 6149 3 0 3 3 0 8 0
vmmpepl 168 42169 0 40241 87 0 87 87 0 357 0
vmsppl 488 551 0 521 5 0 5 5 0 8 1
rwobjpl 80 14651 0 13590 24 0 24 24 0 8 2
pdppl 4096 1111 0 1042 95 22 73 83 0 8 4
pvpl 32 12639 0 0 102 0 102 102 0 265 0
pmappl 256 551 0 521 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 267 0 25 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff8388eff0) 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+0x39 sys/dev/kcov.c:159
intr_handler(ffff80003c3ff200,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153
__mp_lock(ffffffff83a37a00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a37a00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(76) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(76) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
end trace frame: 0xffff80003c3ff640, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff8388eff0) 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+0x39 sys/dev/kcov.c:159
intr_handler(ffff80003c3ff200,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153
__mp_lock(ffffffff83a37a00) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a37a00) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(76) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(76) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff833f72db) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff834b1ea1) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80003c3ff7a0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80003c3ff7a0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff8000fffe9ca8,fffffd8060a966e0,ffff80003c3ff960) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2771
sys_futimens(ffff8000fffe9ca8,ffff80003c3ffab0,ffff80003c3ffa00) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2847
syscall(ffff80003c3ffab0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c3ffab0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b0f5808e80, count: -23
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(ffffffff834b13ba) at panic+0x1e5 sys/kern/subr_prf.c:198
que_free(ffff80000160a000) at que_free+0x15c
sys_msgctl(ffff8000fffe8fb0,ffff800037fb0380,ffff800037fb02d0) at sys_msgctl+0x4ae sys/kern/sysv_msg.c:129
syscall(ffff800037fb0380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037fb0380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8ab12ff7bd0, count: 9
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff834b13ba) at panic+0x1e5 sys/kern/subr_prf.c:198
que_free(ffff80000160a000) at que_free+0x15c
sys_msgctl(ffff8000fffe8fb0,ffff800037fb0380,ffff800037fb02d0) at sys_msgctl+0x4ae sys/kern/sysv_msg.c:129
syscall(ffff800037fb0380) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800037fb0380) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x8ab12ff7bd0, count: -6