witness: userret: returning with the following locks held:
exclusive rwlock vmmaplk r = 0 (0xfffffd806c048c68)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311
#2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5227
#3 uvm_map_pageable_wire+0x588 sys/uvm/uvm_map.c:2128
#4 sys_mlockall+0x85 sys/uvm/uvm_mmap.c:914
#5 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
panic: witness_warn
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
278338 90326 32767 0x10 0x4000000 1 syz-executor
* 52887 89095 32767 0x10 0x4000000 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83382f2f) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff8000ffff0f80) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff8000327e4b70) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000327e4b70) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf94b3e00700, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: witness_warn
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83382f2f) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff8000ffff0f80) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff8000327e4b70) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000327e4b70) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf94b3e00700, count: -6
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000327e48a0
rbx 0xffffffff8386cdd7 cpu_info_full_primary+0x2dd7
rdx 0xffff800001471600
rcx 0xffff8000ffff0f80
rax 0xffffffff8386bff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xf787ae12b9dab394
r11 0x4ff8db271db77a70
r12 0xffffffff8386cbd8 cpu_info_full_primary+0x2bd8
r13 0
r14 0
r15 0x1
rip 0xffffffff82336e45 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff8000327e4890
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=52887 pid=89095 tcnt=3 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=32, usrpri=77, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a2aaf78,0xffff8000ffff14b0
process=0xffff80003c412128 user=0xffff8000327df000, vmspace=0xfffffd806c048b68
estcpu=27, cpticks=50, pctcpu=0.0, user=0, sys=50, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
90326 62880 806 32767 2 0x10 syz-executor
90326 278338 806 32767 7 0x4000010 syz-executor
85970 450874 86744 0 3 0x2 biowait syz-executor
60546 409579 8777 32767 2 0x10 syz-executor
60546 196591 8777 32767 3 0x4000090 fsleep syz-executor
60546 455590 8777 32767 3 0x4000090 fsleep syz-executor
7067 284233 28068 32767 2 0x10 syz-executor
7067 93907 28068 32767 3 0x4000090 fsleep syz-executor
78757 165212 86744 0 2 0x2 syz-executor
92069 329256 4958 32767 3 0x3010 suspend syz-executor
92069 257966 4958 32767 2 0x4081090 syz-executor
89095 214567 56402 32767 2 0x10 syz-executor
89095 356182 56402 32767 3 0x4000090 kqread syz-executor
*89095 52887 56402 32767 7 0x4000010 syz-executor
66509 150550 0 0 3 0x14200 bored sosplice
4958 441117 29113 32767 2 0xc90 syz-executor
80115 190490 9944 32767 2 0x10 syz-executor
56402 471844 51080 32767 2 0x10 syz-executor
806 512772 89226 32767 3 0x90 nanoslp syz-executor
28068 298582 14327 32767 3 0x90 nanoslp syz-executor
8777 524024 15957 32767 2 0xc90 syz-executor
89226 409148 86744 0 3 0x82 wait syz-executor
29113 278603 86744 0 3 0x82 wait syz-executor
15957 417585 86744 0 3 0x82 wait syz-executor
51080 302662 86744 0 3 0x82 wait syz-executor
14327 421068 86744 0 3 0x82 wait syz-executor
9944 238622 86744 0 3 0x82 wait syz-executor
86744 323506 61982 0 3 0x82 kqread syz-executor
61982 265796 21114 0 3 0x10008a sigsusp ksh
21114 63494 86101 0 3 0x98 kqread sshd-session
86101 115102 92442 0 3 0x92 kqread sshd-session
6810 206366 1 0 3 0x100083 ttyin getty
92442 358711 1 0 3 0x88 kqread sshd
75637 194113 32956 73 2 0x1100010 syslogd
32956 337215 1 0 3 0x100082 sbwait syslogd
60923 361186 1 0 3 0x100080 kqread resolvd
87466 320426 78507 77 3 0x100092 kqread dhcpleased
53253 382468 78507 77 3 0x100092 kqread dhcpleased
78507 99553 1 0 3 0x80 kqread dhcpleased
84796 191299 0 0 3 0x14200 bored smr
67010 43887 0 0 2 0x14200 zerothread
90788 465912 0 0 3 0x14200 aiodoned aiodoned
48494 521629 0 0 3 0x14200 syncer update
57521 184188 0 0 3 0x14200 cleaner cleaner
17373 519991 0 0 3 0x14200 reaper reaper
7906 55428 0 0 3 0x14200 pgdaemon pagedaemon
54066 189955 0 0 3 0x14200 bored viomb
12478 61437 0 0 3 0x40014200 acpi0 acpi0
39204 184381 0 0 3 0x40014200 idle1
1994 10052 0 0 3 0x14200 bored softnet3
25189 292858 0 0 3 0x14200 bored softnet2
89910 25398 0 0 3 0x14200 bored softnet1
16364 265521 0 0 3 0x14200 bored softnet0
57701 377929 0 0 2 0x14200 systqmp
51980 138708 0 0 3 0x14200 bored systq
44191 441851 0 0 2 0x14200 softclockmp
85835 524111 0 0 3 0x40014200 tmoslp softclock
52021 130886 0 0 3 0x40014200 idle0
1 295802 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 90326 (syz-executor) thread 0xffff8000ffff0020 (62880)
exclusive rwlock uobjlk r = 0 (0xfffffd806e0eb180)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311
#2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1236
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1370
#4 uvm_fault+0x278 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
#6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd806c18b6c0)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:398
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924
#3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:188
#6 usertrap+0x2d8 sys/arch/amd64/amd64/trap.c:436
#7 recall_trap+0x8
Process 85970 (syz-executor) thread 0xffff8000ffff14a0 (450874)
exclusive rrwlock inode r = 0 (0xfffffd8066f01e20)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:606
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230
#6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3109
#10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd807e28f670)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:606
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
#6 namei+0x7aa sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094
#8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#9 Xsyscall+0x128
Process 89095 (syz-executor) thread 0xffff8000ffff0f80 (52887)
exclusive rwlock vmmaplk r = 0 (0xfffffd806c048c68)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x367 sys/kern/kern_rwlock.c:311
#2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5227
#3 uvm_map_pageable_wire+0x588 sys/uvm/uvm_map.c:2128
#4 sys_mlockall+0x85 sys/uvm/uvm_mmap.c:914
#5 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579
#6 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10185 10950K 10966K 166960K 11268 0
pcb 17 12K 12K 166960K 17 0
rtable 192 5K 7K 166960K 363 0
pf 27 16K 16K 166960K 31 0
ifaddr 34 6K 7K 166960K 44 0
ifgroup 42 1K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 8 0
counters 62 36K 36K 166960K 66 0
ioctlops 0 0K 2K 166960K 29 0
iov 0 0K 12K 166960K 6 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1334 84K 84K 166960K 1382 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 9 0K 0K 166960K 11 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 21 74K 125K 166960K 323 0
sigio 0 0K 0K 166960K 136 0
proc 58 79K 127K 166960K 497 0
subproc 57 3K 4K 166960K 93 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 71 0
in_multi 77 5K 7K 166960K 106 0
ether_multi 1 0K 0K 166960K 2 0
mrt 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 428 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 229 177K 206K 166960K 4532 0
UVM aobj 7 2K 2K 166960K 7 0
pinsyscall 42 84K 112K 166960K 1362 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 14 0
NDP 9 0K 2K 166960K 27 0
temp 36 8671K 8738K 166960K 4853 0
kqueue 15 24K 30K 166960K 72 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 54 0 51 1 0 1 1 0 8 0
rtentry 176 114 0 25 6 0 6 6 0 8 0
unpcb 144 168 0 151 2 0 2 2 0 8 1
syncache 336 7 0 7 1 0 1 1 0 8 1
tcpcb 808 141 0 136 7 0 7 7 0 8 6
arp 128 18 0 4 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 1 0 0 1 0 1 1 0 8 0
inpcb 384 310 0 300 8 0 8 8 0 8 6
nd6 144 27 0 8 1 0 1 1 0 8 0
kcovpl 48 10 0 4 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 472 0 105 30 0 30 30 0 8 2
art_table 32 473 0 105 4 0 4 4 0 8 0
art_node 16 113 0 32 1 0 1 1 0 8 0
sysvmsgpl 40 5 0 1 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 9 0 2 1 0 1 1 0 8 0
shmpl 112 4 0 0 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 1811 0 299 95 0 95 95 0 8 0
ffsino 288 1811 0 299 109 0 109 109 0 8 0
nchpl 144 2236 0 556 63 0 63 63 0 8 0
uvmvnodes 80 1913 0 0 40 0 40 40 0 8 0
vnodes 216 1913 0 0 107 0 107 107 0 8 0
namei 1024 7149 0 7148 2 0 2 2 0 8 1
percpumem 16 48 0 2 1 0 1 1 0 8 0
kstatmem 264 24 0 4 2 0 2 2 0 8 0
scxspl 216 7595 0 7594 5 1 4 4 1 8 3
plimitpl 152 128 0 105 2 0 2 2 0 8 0
sigapl 424 600 0 548 8 0 8 8 0 8 0
knotepl 120 730 0 0 23 0 23 23 0 8 0
kqueuepl 224 90 0 77 1 0 1 1 0 8 0
pipepl 336 158 0 131 5 0 5 5 0 8 2
fdescpl 520 581 0 548 4 0 4 4 0 8 0
filepl 160 2725 0 2530 13 0 13 13 0 8 3
lockfpl 104 77 0 74 1 0 1 1 0 8 0
lockfspl 48 25 0 22 1 0 1 1 0 8 0
sessionpl 144 26 0 12 1 0 1 1 0 8 0
pgrppl 48 41 0 19 1 0 1 1 0 8 0
ucredpl 104 294 0 277 1 0 1 1 0 8 0
zombiepl 144 548 0 548 1 0 1 1 0 8 1
processpl 1208 600 0 548 5 0 5 5 0 8 0
procpl 656 892 0 833 7 0 7 7 0 8 1
sockpl 728 535 0 505 9 0 9 9 0 8 6
mcl64k 65536 3 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 109 0 0 14 0 14 14 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 256 242 0 0 16 0 16 16 0 8 0
bufpl 280 5284 0 116 370 0 370 370 0 8 0
anonpl 32 9427 0 0 76 0 76 76 0 246 0
amapchunkpl 152 13982 0 13255 31 0 31 31 0 158 1
amappl16 200 2558 0 2535 15 4 11 14 0 8 8
amappl15 192 5 0 5 1 1 0 1 0 8 0
amappl14 184 115 0 104 1 0 1 1 0 8 0
amappl13 176 4 0 4 1 1 0 1 0 8 0
amappl12 168 1187 0 1155 2 0 2 2 0 8 0
amappl11 160 45 0 35 1 0 1 1 0 8 0
amappl10 152 5 0 5 1 1 0 1 0 8 0
amappl9 144 248 0 248 1 1 0 1 0 8 0
amappl8 136 22 0 20 1 0 1 1 0 8 0
amappl7 128 113 0 103 1 0 1 1 0 8 0
amappl6 120 177 0 174 1 0 1 1 0 8 0
amappl5 112 123 0 117 1 0 1 1 0 8 0
amappl4 104 296 0 280 1 0 1 1 0 8 0
amappl3 96 2384 0 2273 4 0 4 4 0 8 0
amappl2 88 628 0 572 2 0 2 2 0 8 0
amappl1 80 9268 0 8718 14 0 14 14 0 8 0
amappl 88 3831 0 3669 5 0 5 5 0 92 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 6 0 0 1 0 1 1 0 8 0
uaddrrnd 24 581 0 548 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 581 0 548 1 0 1 1 0 8 0
vmmpekpl 168 6700 0 6645 3 0 3 3 0 8 0
vmmpepl 168 44066 0 42175 100 0 100 100 0 357 6
vmsppl 480 580 0 548 7 1 6 6 0 8 1
rwobjpl 72 16953 0 14228 54 0 54 54 0 8 1
pdppl 4096 1169 0 1096 111 32 79 97 0 8 6
pvpl 32 28042 0 0 227 0 227 227 0 265 0
pmappl 256 580 0 548 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 407 0 35 12 0 12 12 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(ffffffff83382f2f) at panic+0x1e5 sys/kern/subr_prf.c:198
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline]
witness_warn(2,0,ffffffff8333d8ad) at witness_warn+0x850 sys/kern/subr_witness.c:1485
userret(ffff8000ffff0f80) at userret+0x3a4 sys/kern/kern_sig.c:2227
syscall(ffff8000327e4b70) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000327e4b70) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf94b3e00700, count: -6
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299ddff0) 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
__mp_lock(ffffffff839d6b00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline]
__mp_lock(ffffffff839d6b00) at __mp_lock+0x192 sys/kern/kern_lock.c:144
vn_write(fffffd806c05b5e0,ffff8000327d2028,0) at vn_write+0x4e sys/kern/vfs_vnops.c:393
dofilewritev(ffff8000ffff1c50,c8,ffff8000327d2028,0,ffff8000327d20e0) at dofilewritev+0x23c sys/kern/sys_generic.c:380
sys_write(ffff8000ffff1c50,ffff8000327d2190,ffff8000327d20e0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff8000327d2190) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000327d2190) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6a3141a70, count: 6
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) 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
__mp_lock(ffffffff839d6b00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline]
__mp_lock(ffffffff839d6b00) at __mp_lock+0x192 sys/kern/kern_lock.c:144
vn_write(fffffd806c05b5e0,ffff8000327d2028,0) at vn_write+0x4e sys/kern/vfs_vnops.c:393
dofilewritev(ffff8000ffff1c50,c8,ffff8000327d2028,0,ffff8000327d20e0) at dofilewritev+0x23c sys/kern/sys_generic.c:380
sys_write(ffff8000ffff1c50,ffff8000327d2190,ffff8000327d20e0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff8000327d2190) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000327d2190) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6a3141a70, count: -9