uvm_fault(0xfffffd806bbf7908, 0xf, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82f10ab8 cs 8 rflags 10246 cr2 f cpl 0 rsp ffff800040e11ca0 gsbase 0xffff800029a9bff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82f10ab8 Starting stack trace... panic(ffffffff8332470d) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800040e11bf0) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ktrops(ffff8000ffffacf0,ffffffffffffffff,0,80000b1c,fffffd806bb106f8,fffffd807f7d37b8) at ktrops+0x58 ktrcanset sys/kern/kern_ktrace.c:727 [inline] ktrops(ffff8000ffffacf0,ffffffffffffffff,0,80000b1c,fffffd806bb106f8,fffffd807f7d37b8) at ktrops+0x58 sys/kern/kern_ktrace.c:570 doktrace(fffffd806bb106f8,4,b1c,0,ffff8000ffffacf0) at doktrace+0x6dd ktrsetchildren sys/kern/kern_ktrace.c:595 [inline] doktrace(fffffd806bb106f8,4,b1c,0,ffff8000ffffacf0) at doktrace+0x6dd sys/kern/kern_ktrace.c:517 sys_ktrace(ffff8000ffffacf0,ffff800040e12000,ffff800040e11f50) at sys_ktrace+0x11c sys/kern/kern_ktrace.c:558 syscall(ffff800040e12000) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800040e12000) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc26cbd6f530, count: 249 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 83 -738974816 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND *269883 31995 0 0 0x4000000 1 syz-executor 107377 44701 0 0 0x4000000 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xc2f62cd0870, count: 14 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 *cpu1: uvm_fault(0xfffffd806bbf7908, 0xf, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc2f62cd0870, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c52e4d0 rbx 0 rdx 0 rcx 0xffff80002a488570 rax 0x3b r8 0xffff80003c52e400 r9 0x1 r10 0x6d42d444ac7b7105 r11 0x674f71c5bb98864d r12 0 r13 0 r14 0xffff80002a488570 r15 0 rip 0xffffffff831f23ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c52e450 ss 0 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=269883 pid=31995 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffa540,0xffff80002a489770 process=0xffff8000fffeb2b8 user=0xffff80003c529000, vmspace=0xfffffd806bbf73b0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31995 496040 77061 0 3 0 futex syz-executor 31995 118197 77061 0 3 0x4000080 fsleep syz-executor *31995 269883 77061 0 7 0x4000000 syz-executor 99700 66114 97451 60929 2 0x10 syz-executor 99700 432031 97451 60929 3 0x4000090 fsleep syz-executor 78981 234047 92742 0 2 0 syz-executor 78981 43784 92742 0 3 0x4000000 sbar syz-executor 44701 217112 93604 0 3 0 futex syz-executor 44701 369388 93604 0 3 0x4000000 futex syz-executor 44701 107377 93604 0 7 0x4000000 syz-executor 91333 218809 60242 0 3 0x80 nanoslp syz-executor 91333 33452 60242 0 3 0x4000080 kqread syz-executor 91333 480008 60242 0 3 0x4000080 fsleep syz-executor 91333 313424 60242 0 2 0x4000000 syz-executor 40078 355028 69666 -1 2 0x10 syz-executor 40078 136837 69666 -1 3 0x4000010 futex syz-executor 40078 161588 69666 -1 3 0x4000090 fsleep syz-executor 81692 383226 29509 0 3 0 futex syz-executor 81692 8867 29509 0 3 0x4000000 futex syz-executor 81692 451083 29509 0 2 0x4000000 syz-executor 92742 474716 88118 0 3 0x82 nanoslp syz-executor 29509 353948 88118 0 3 0x82 nanoslp syz-executor 97451 323949 88118 0 3 0x82 nanoslp syz-executor 60242 154762 88118 0 3 0x82 nanoslp syz-executor 77061 134117 88118 0 3 0x82 nanoslp syz-executor 69666 227140 88118 0 3 0x82 nanoslp syz-executor 48597 436102 1 0 3 0x100083 ttyin getty 93796 164775 0 0 3 0x14280 nfsidl nfsio 9091 323756 0 0 3 0x14280 nfsidl nfsio 64564 297644 0 0 3 0x14280 nfsidl nfsio 27045 436130 0 0 3 0x14280 nfsidl nfsio 2654 390630 0 0 3 0x14280 nfsidl nfsio 10641 252876 0 0 3 0x14280 nfsidl nfsio 34178 407653 0 0 3 0x14280 nfsidl nfsio 34635 279132 0 0 3 0x14280 nfsidl nfsio 79258 336154 0 0 3 0x14280 nfsidl nfsio 39075 193839 0 0 3 0x14280 nfsidl nfsio 11135 334506 0 0 3 0x14280 nfsidl nfsio 14419 350904 0 0 3 0x14280 nfsidl nfsio 10662 243602 0 0 3 0x14280 nfsidl nfsio 77612 489985 0 0 3 0x14280 nfsidl nfsio 70205 307411 0 0 3 0x14280 nfsidl nfsio 29643 281333 0 0 3 0x14280 nfsidl nfsio 52269 304702 0 0 3 0x14280 nfsidl nfsio 18310 465285 0 0 3 0x14280 nfsidl nfsio 99210 453341 0 0 3 0x14280 nfsidl nfsio 85730 194561 0 0 3 0x14280 nfsidl nfsio 93604 245214 88118 0 3 0x82 nanoslp syz-executor 69025 82880 88118 0 3 0x82 nanoslp syz-executor 64797 300076 0 0 3 0x14200 bored sosplice 19050 239751 2139 0 3 0x100082 sbwait ndp 2139 488716 1 0 3 0x10008a sigsusp sh 95067 445583 36017 0 3 0x100082 sbwait arp 36017 209037 1 0 3 0x10008a sigsusp sh 88118 363739 42326 0 3 0x82 kqread syz-executor 42326 354094 31398 0 3 0x10008a sigsusp ksh 31398 225283 35659 0 3 0x98 kqread sshd-session 35659 230418 57831 0 3 0x92 kqread sshd-session 57831 143018 1 0 3 0x88 kqread sshd 71390 509681 14850 74 3 0x1100092 bpf pflogd 14850 360306 1 0 3 0x80 sbwait pflogd 16980 214687 46393 73 3 0x1100090 kqread syslogd 46393 39526 1 0 3 0x100082 sbwait syslogd 76343 351062 1 0 3 0x100080 kqread resolvd 99466 446984 13788 77 3 0x100092 kqread dhcpleased 87941 95564 13788 77 3 0x100092 kqread dhcpleased 13788 90616 1 0 3 0x80 kqread dhcpleased 6923 426168 0 0 3 0x14200 bored smr 11522 170985 0 0 3 0x14200 pgzero zerothread 61984 427976 0 0 3 0x14200 aiodoned aiodoned 40101 73854 0 0 3 0x14200 syncer update 60440 283709 0 0 3 0x14200 cleaner cleaner 50706 246080 0 0 3 0x14200 reaper reaper 17043 366713 0 0 3 0x14200 pgdaemon pagedaemon 61593 58942 0 0 3 0x14200 bored viomb 95061 105675 0 0 3 0x40014200 acpi0 acpi0 93065 173304 0 0 3 0x40014200 idle1 42156 165947 0 0 3 0x14200 bored softnet3 48367 142699 0 0 3 0x14200 bored softnet2 93917 453264 0 0 3 0x14200 bored softnet1 61069 343612 0 0 2 0x14200 softnet0 16496 60517 0 0 2 0x14200 systqmp 30159 237720 0 0 3 0x14200 bored systq 11104 464658 0 0 3 0x14200 tmoslp softclockmp 82326 119924 0 0 3 0x40014200 tmoslp softclock 52611 112869 0 0 3 0x40014200 idle0 1 262263 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 99700 (syz-executor) thread 0xffff80002a328558 (66114) Process 99700 (syz-executor) thread 0xffff8000ffffb210 (432031) Process 78981 (syz-executor) thread 0xffff8000ffffacf0 (43784) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10217 11067K 11953K 166960K 20124 0 pcb 17 20K 22K 166960K 1467 0 rtable 240 15K 15K 166960K 1676 0 pf 42 19K 146K 166960K 621 0 ifaddr 39 8K 9K 166960K 320 0 ifgroup 57 2K 2K 166960K 594 0 sysctl 4 1K 2K 166960K 17 0 counters 66 36K 37K 166960K 486 0 ioctlops 0 0K 4K 166960K 2513 0 iov 0 0K 32K 166960K 463 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1566 98K 99K 166960K 6665 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 101 0 VM map 2 1K 1K 166960K 2 0 sem 23 48K 58K 166960K 53 0 dirhash 12 2K 3K 166960K 78 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 22 81K 118K 166960K 5950 0 sigio 0 0K 0K 166960K 126 0 proc 72 91K 127K 166960K 1911 0 subproc 90 5K 5K 166960K 317 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 894 0 in_multi 78 5K 7K 166960K 506 0 ether_multi 1 0K 0K 166960K 38 0 mrt 1 0K 0K 166960K 27 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 1605 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 8 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 292 167K 188K 166960K 53737 0 UVM aobj 108 5K 7K 166960K 113 0 pinsyscall 49 98K 110K 166960K 7799 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 336 0 NDP 15 0K 1K 166960K 230 0 temp 80 8692K 8948K 166960K 209273 0 kqueue 14 22K 34K 166960K 1004 0 SYN cache 2 10K 18K 166960K 3 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 24 0 0 1 0 1 1 0 8 0 rtpcb 120 633 0 628 6 5 1 3 0 8 0 rtentry 168 508 0 415 6 1 5 5 0 8 0 unpcb 144 4237 0 4219 29 25 4 6 0 8 3 syncache 336 18 0 18 9 9 0 1 0 8 0 tcpqe 32 7 0 7 4 4 0 1 0 8 0 tcpcb 808 1674 0 1668 46 45 1 14 0 8 0 arp 120 89 0 69 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 376 6377 0 6367 84 77 7 18 0 8 5 nd6 136 117 0 94 2 1 1 2 0 8 0 pkpcb 40 115 0 115 14 13 1 1 0 8 1 kcovpl 48 35 0 25 1 0 1 1 0 8 0 mppekey 1024 10 0 10 9 8 1 1 0 8 1 ppxss 1168 117 0 116 4 3 1 1 0 8 0 pppxif 1480 35 0 35 13 13 0 1 0 8 0 pfstscr 40 6 0 6 1 1 0 1 0 8 0 pffrag 232 58 0 49 1 0 1 1 0 482 0 pffrnode 88 54 0 45 1 0 1 1 0 8 0 pffrent 40 110 0 101 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 13 0 7 1 0 1 1 0 8 0 pfanchor 1288 7 0 0 1 0 1 1 0 8 0 pftag 88 6 0 0 1 0 1 1 0 8 0 pfstitem 24 267 0 192 1 0 1 1 0 8 0 pfstkey 128 274 0 199 3 0 3 3 0 8 0 pfstate 376 269 0 195 10 1 9 9 0 8 0 pfrule 1344 116 0 102 3 1 2 2 0 8 0 art_heap8 4096 5 0 1 5 1 4 4 0 8 0 art_heap4 256 1979 0 1618 45 21 24 28 0 8 1 art_table 32 1984 0 1619 5 1 4 4 0 8 0 art_node 16 495 0 416 1 0 1 1 0 8 0 sysvmsgpl 40 26 0 18 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 46 0 25 1 0 1 1 0 8 0 shmpl 112 110 0 5 3 0 3 3 0 8 0 dirhash 1024 61 0 44 3 0 3 3 0 8 0 dino2pl 256 11762 0 10196 99 0 99 99 0 8 0 ffsino 280 11762 0 10196 113 0 113 113 0 8 0 nchpl 144 19888 0 19281 65 38 27 65 0 8 0 rtmask 32 16 0 16 6 5 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 76992 0 76991 9 8 1 2 0 8 0 percpumem 16 257 0 210 1 0 1 1 0 8 0 pfiaddrpl 120 4 0 0 1 0 1 1 0 8 0 kstatmem 264 324 0 298 5 2 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 21 0 21 13 12 1 1 0 8 1 scxspl 216 61659 0 61659 23 22 1 8 1 8 1 plimitpl 152 1102 0 1083 1 0 1 1 0 8 0 sigapl 424 6260 0 6185 12 3 9 9 0 8 0 futexpl 64 84811 0 84807 1 0 1 1 0 8 0 knotepl 120 855 0 0 24 0 24 24 0 8 0 kqueuepl 216 2485 0 2475 31 26 5 5 0 8 4 pipepl 328 919 0 886 23 19 4 9 0 8 0 fdescpl 504 6187 0 6151 6 1 5 6 0 8 0 filepl 152 45027 0 44775 54 36 18 19 0 8 5 lockfpl 104 2071 0 2069 4 3 1 2 0 8 0 lockfspl 48 697 0 695 1 0 1 1 0 8 0 sessionpl 144 66 0 57 1 0 1 1 0 8 0 pgrppl 48 377 0 358 1 0 1 1 0 8 0 ucredpl 104 8338 0 8321 1 0 1 1 0 8 0 zombiepl 144 6816 0 6815 1 0 1 1 0 8 0 processpl 1176 6260 0 6185 7 1 6 6 0 8 0 procpl 656 15404 0 15316 11 2 9 9 0 8 0 srpgc 96 54 0 54 13 12 1 1 0 8 1 sosppl 168 30 0 30 11 11 0 1 0 8 0 sockpl 688 11450 0 11418 113 103 10 19 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 134 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 58 0 0 6 0 6 6 0 8 0 mtagpl 96 223 0 0 6 1 5 6 0 8 0 mbufpl 256 471 0 0 29 0 29 29 0 8 0 bufpl 280 17086 0 10932 440 0 440 440 0 8 0 anonpl 24 724422 0 716875 120 49 71 76 0 184 0 amapchunkpl 152 183853 0 183148 75 41 34 39 0 158 3 amappl16 200 12669 0 12525 80 63 17 22 0 8 0 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 199 0 185 1 0 1 1 0 8 0 amappl13 176 21 0 21 5 5 0 1 0 8 0 amappl12 168 7285 0 7247 4 1 3 3 0 8 0 amappl11 160 52 0 37 1 0 1 1 0 8 0 amappl10 152 7 0 7 3 3 0 1 0 8 0 amappl9 144 258 0 258 1 1 0 1 0 8 0 amappl8 136 25 0 22 1 0 1 1 0 8 0 amappl7 128 174 0 160 1 0 1 1 0 8 0 amappl6 120 461 0 455 1 0 1 1 0 8 0 amappl5 112 235 0 225 1 0 1 1 0 8 0 amappl4 104 459 0 436 1 0 1 1 0 8 0 amappl3 96 39012 0 38873 4 0 4 4 0 8 0 amappl2 88 1138 0 1067 2 0 2 2 0 8 0 amappl1 80 36854 0 36192 17 1 16 16 0 8 0 amappl 88 51366 0 51161 5 0 5 5 0 92 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 2 0 2 2 2 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 10 0 10 5 5 0 1 0 8 0 dma128 128 257 0 257 5 5 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 25 0 24 1 0 1 1 0 8 0 aobjpl 72 112 0 5 2 0 2 2 0 8 0 uaddrrnd 24 6187 0 6151 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6187 0 6151 1 0 1 1 0 8 0 vmmpekpl 168 44364 0 44297 4 0 4 4 0 8 0 vmmpepl 168 382334 0 379938 158 47 111 115 0 357 0 vmsppl 456 6186 0 6151 5 0 5 5 0 8 0 rwobjpl 64 93438 0 86217 126 5 121 121 0 8 0 pdppl 4096 12381 0 12302 177 96 81 87 0 8 2 pvpl 32 22727 0 0 182 1 181 181 0 265 0 pmappl 248 6186 0 6151 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 489 0 214 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8385cff0) 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(ffffffff83973580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a3b8530,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83973580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83973580) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x199 sys/kern/kern_lock.c:144 vn_ioctl(fffffd806c919300,80044b02,ffff80002a3b8890,ffff80002a489760) at vn_ioctl+0x4d sys/kern/vfs_vnops.c:514 sys_ioctl(ffff80002a489760,ffff80002a3b8a70,ffff80002a3b89c0) at sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 syscall(ffff80002a3b8a70) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b8a70) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa2c0bbd79c0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff8385cff0) 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(ffffffff83973580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a3b8530,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83973580) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x192 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83973580) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff83973580) at __mp_lock+0x199 sys/kern/kern_lock.c:144 vn_ioctl(fffffd806c919300,80044b02,ffff80002a3b8890,ffff80002a489760) at vn_ioctl+0x4d sys/kern/vfs_vnops.c:514 sys_ioctl(ffff80002a489760,ffff80002a3b8a70,ffff80002a3b89c0) at sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 syscall(ffff80002a3b8a70) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b8a70) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa2c0bbd79c0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0xc2f62cd0870, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xc2f62cd0870, count: -1