uvm_fault(0xfffffd806ef655c0, 0x48, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82de95e5 cs 8 rflags 10246 cr2 48 cpl 0 rsp ffff80002a36efa0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82de95e5 Starting stack trace... panic(ffffffff833a1b4a) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a36eef0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x4a sys/kern/kern_lock.c:260 clockintr_unbind(ffff8000015dc730,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff800001478000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582 dtclose(11e5f,81,2000,ffff8000384094e0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000384094e0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a36f1e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80612c2be0,81,fffffd80097fb820,ffff8000384094e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8060bbbd88,ffff8000384094e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8060bbbd88,ffff8000384094e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8060bbbd88,ffff8000384094e0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8060bbbd88,ffff8000384094e0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000384094e0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000384094e0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000384094e0,ffff80002a36f550,ffff80002a36f4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a36f550) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a36f550) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d9090443910, count: 239 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -590182600 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 501324 94248 0 0 0x4000000 0 syz-executor *436162 18452 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7cdedcd28720, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806ef655c0, 0x48, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cdedcd28720, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3b9570 rbx 0 rdx 0 rcx 0xffff8000ffff22a8 rax 0x3b r8 0xffff80002a3b94a0 r9 0x1 r10 0xc725ee15b5fa9535 r11 0x56312c880f7dbe15 r12 0 r13 0 r14 0xffff8000ffff22a8 r15 0 rip 0xffffffff81e083ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3b94f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=436162 pid=18452 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b87e0,0xffff8000ffff2550 process=0xffff8000ffff6708 user=0xffff80002a3b4000, vmspace=0xfffffd800b0275b8 estcpu=36, cpticks=159, pctcpu=0.53, user=0, sys=158, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88135 350091 31447 0 2 0 syz-executor 54249 241226 97158 0 2 0 syz-executor 5098 52288 64748 0 2 0 syz-executor 5098 452704 64748 0 2 0x4000000 syz-executor 94248 274531 18452 0 2 0 syz-executor 94248 501324 18452 0 7 0x4000000 syz-executor 4582 51018 6760 0 3 0x80 nanoslp syz-executor 4582 445389 6760 0 3 0x4000080 kqsel syz-executor 4582 388591 6760 0 3 0x4000080 fsleep syz-executor 72572 368673 50030 0 3 0x80 nanoslp syz-executor 72572 568 50030 0 3 0x4000080 pppxread syz-executor 72572 79676 50030 0 3 0x4000080 fsleep syz-executor 5879 325600 41838 0 3 0x80 nanoslp syz-executor 5879 81094 41838 0 3 0x4000080 ttyout syz-executor 5879 424791 41838 0 3 0x4000080 fsleep syz-executor 48243 508903 97024 0 3 0x82 nanoslp syz-executor 41838 124011 97024 0 3 0x82 nanoslp syz-executor 50030 480150 97024 0 3 0x82 nanoslp syz-executor 12276 232615 1 0 3 0x100083 ttyin getty 6760 76420 97024 0 2 0x2 syz-executor 86847 185290 0 0 3 0x14200 bored sosplice 64748 351417 97024 0 3 0x82 nanoslp syz-executor *18452 436162 97024 0 7 0x2 syz-executor 31447 82906 97024 0 3 0x82 nanoslp syz-executor 97158 382135 97024 0 3 0x82 nanoslp syz-executor 97024 284487 55248 0 3 0x82 kqread syz-executor 55248 282905 44466 0 3 0x10008a sigsusp ksh 44466 501145 73720 0 3 0x98 kqread sshd-session 73720 141507 74640 0 3 0x92 kqread sshd-session 74640 405596 1 0 3 0x88 kqread sshd 33585 177688 46481 74 3 0x1100092 bpf pflogd 46481 217427 1 0 3 0x80 sbwait pflogd 18340 451160 47353 73 3 0x1100090 kqread syslogd 47353 434744 1 0 3 0x100082 sbwait syslogd 24795 478695 1 0 3 0x100080 kqread resolvd 62895 52176 83480 77 3 0x100092 kqread dhcpleased 42835 290899 83480 77 3 0x100092 kqread dhcpleased 83480 503354 1 0 3 0x80 kqread dhcpleased 40120 173970 0 0 3 0x14200 bored smr 35971 139416 0 0 2 0x14200 zerothread 85450 412897 0 0 3 0x14200 aiodoned aiodoned 987 99670 0 0 3 0x14200 syncer update 55557 323987 0 0 3 0x14200 cleaner cleaner 94129 167005 0 0 3 0x14200 reaper reaper 71958 227506 0 0 3 0x14200 pgdaemon pagedaemon 89035 361015 0 0 3 0x14200 bored viomb 19494 176970 0 0 3 0x40014200 acpi0 acpi0 56693 128479 0 0 3 0x40014200 idle1 89320 1554 0 0 3 0x14200 bored softnet7 19365 482214 0 0 3 0x14200 bored softnet6 93032 321049 0 0 3 0x14200 bored softnet5 74426 488170 0 0 3 0x14200 bored softnet4 4529 370880 0 0 3 0x14200 bored softnet3 67132 220474 0 0 3 0x14200 bored softnet2 7032 213944 0 0 3 0x14200 bored softnet1 14752 85317 0 0 3 0x14200 netlock softnet0 94257 118470 0 0 2 0x40014200 systqmp 89378 107062 0 0 3 0x14200 bored systq 86994 167312 0 0 3 0x14200 tmoslp softclockmp 76014 353700 0 0 3 0x40014200 tmoslp softclock 38369 165401 0 0 3 0x40014200 idle0 1 387964 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 94248 (syz-executor) thread 0xffff80002a2b9240 (501324) exclusive rwlock amaplk r = 0 (0xfffffd80783d2318) #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 uvm_fault_check+0x597 sys/uvm/uvm_fault.c:862 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806d39e130) #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: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:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10247 11079K 11371K 166960K 12783 0 pcb 17 17K 25K 166960K 283 0 rtable 194 9K 10K 166960K 455 0 pf 33 17K 81K 166960K 164 0 ifaddr 39 7K 8K 166960K 113 0 ifgroup 51 2K 2K 166960K 189 0 sysctl 3 1K 9K 166960K 45 0 counters 66 36K 37K 166960K 222 0 ioctlops 0 0K 4K 166960K 1634 0 iov 0 0K 16K 166960K 121 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1401 88K 88K 166960K 2270 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 40 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1143 0 sigio 1 0K 0K 166960K 32 0 proc 72 115K 164K 166960K 775 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 307 0 in_multi 85 6K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 579 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 168K 182K 166960K 11778 0 UVM aobj 22 4K 4K 166960K 22 0 pinsyscall 43 86K 102K 166960K 2354 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 46 0 NDP 13 0K 2K 166960K 82 0 temp 81 8652K 8780K 166960K 55702 0 kqueue 13 20K 32K 166960K 204 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 120 107 0 104 1 0 1 1 0 8 0 rtentry 176 157 0 80 5 0 5 5 0 8 0 unpcb 144 1054 0 1037 12 8 4 7 0 8 3 syncache 336 11 0 11 4 3 1 1 0 8 1 tcpqe 32 4 0 4 3 2 1 1 0 8 1 tcpcb 736 231 0 224 4 2 2 4 0 8 1 arp 128 19 0 8 1 0 1 1 0 8 0 inpcb 328 1309 0 1294 20 17 3 12 0 8 1 nd6 144 25 0 13 1 0 1 1 0 8 0 pkpcb 40 11 0 11 3 2 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 63 0 63 2 1 1 1 0 8 1 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pffrag 232 5 0 2 1 0 1 1 0 482 0 pffrnode 88 5 0 2 1 0 1 1 0 8 0 pffrent 40 9 0 6 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfrktable 1344 5 0 5 1 0 1 1 0 8 1 pfanchor 1288 1 0 1 1 0 1 1 0 8 1 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 73 0 30 1 0 1 1 0 8 0 pfstkey 128 77 0 34 2 0 2 2 0 8 0 pfstate 384 75 0 32 5 0 5 5 0 8 0 pfrule 1344 26 0 21 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 700 0 324 31 7 24 30 0 8 0 art_table 40 703 0 324 5 0 5 5 0 8 0 art_node 32 155 0 87 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 19 0 0 1 0 1 1 0 8 0 dirhash 1024 25 0 8 3 0 3 3 0 8 0 dino2pl 256 3408 0 1891 96 0 96 96 0 8 0 ffsino 296 3408 0 1891 118 0 118 118 0 8 0 nchpl 144 4971 0 3275 64 0 64 64 0 8 0 rtmask 32 20 0 20 3 2 1 1 0 8 1 uvmvnodes 80 4048 0 0 83 0 83 83 0 8 0 vnodes 216 4048 0 0 225 0 225 225 0 8 0 namei 1024 17244 0 17244 2 1 1 2 0 8 1 percpumem 16 126 0 78 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 1 1 0 1 1 0 8 1 kstatmem 264 118 0 94 4 2 2 3 0 8 0 scsiplug 72 6 0 6 3 2 1 1 0 8 1 scxspl 216 30451 0 30451 11 10 1 8 1 8 1 plimitpl 152 289 0 272 1 0 1 1 0 8 0 sigapl 424 1450 0 1395 7 0 7 7 0 8 0 knotepl 120 659 0 0 20 0 20 20 0 8 0 kqueuepl 224 561 0 550 8 6 2 5 0 8 1 pipepl 344 371 0 344 13 10 3 9 0 8 0 fdescpl 528 1421 0 1389 3 0 3 3 0 8 0 filepl 160 9544 0 9317 29 11 18 20 0 8 5 lockfpl 104 438 0 436 1 0 1 1 0 8 0 lockfspl 48 195 0 193 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 64 0 47 1 0 1 1 0 8 0 ucredpl 104 1328 0 1315 1 0 1 1 0 8 0 zombiepl 144 1396 0 1395 1 0 1 1 0 8 0 processpl 1248 1450 0 1395 5 0 5 5 0 8 0 procpl 664 3168 0 3105 7 0 7 7 0 8 0 sosppl 168 5 0 5 3 2 1 1 0 8 1 sockpl 752 2543 0 2508 54 43 11 28 0 8 7 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 7 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 34 0 0 5 0 5 5 0 8 0 mtagpl 96 8 0 0 1 0 1 1 0 8 0 mbufpl 256 197 0 0 12 0 12 12 0 8 0 bufpl 280 11941 0 5798 439 0 439 439 0 8 0 anonpl 32 11012 0 0 89 0 89 89 0 246 0 amapchunkpl 152 39502 0 38985 42 13 29 33 0 158 2 amappl16 200 4863 0 4829 43 25 18 23 0 8 11 amappl15 192 66 0 66 1 1 0 1 0 8 0 amappl14 184 132 0 120 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 2130 0 2100 4 1 3 3 0 8 0 amappl11 160 52 0 37 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 286 0 286 1 1 0 1 0 8 0 amappl8 136 23 0 20 1 0 1 1 0 8 0 amappl7 128 131 0 118 1 0 1 1 0 8 0 amappl6 120 218 0 214 1 0 1 1 0 8 0 amappl5 112 164 0 153 1 0 1 1 0 8 0 amappl4 104 317 0 298 1 0 1 1 0 8 0 amappl3 96 7920 0 7818 5 1 4 4 0 8 0 amappl2 88 731 0 669 2 0 2 2 0 8 0 amappl1 80 13927 0 13316 16 1 15 15 0 8 0 amappl 88 10829 0 10667 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 255 0 255 3 2 1 1 0 8 1 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 21 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1421 0 1389 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1421 0 1389 1 0 1 1 0 8 0 vmmpekpl 168 13121 0 13066 3 0 3 3 0 8 0 vmmpepl 168 96714 0 94681 114 7 107 108 0 357 3 vmsppl 488 1420 0 1389 7 2 5 5 0 8 0 rwobjpl 80 31390 0 26382 110 0 110 110 0 8 0 pdppl 4096 2850 0 2778 112 38 74 86 0 8 2 pvpl 32 20161 0 0 164 1 163 163 0 265 0 pmappl 256 1420 0 1389 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 300 0 56 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837f9ff0) 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(ffffffff839abab8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x50 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x50 sys/dev/kcov.c:153 __mp_lock(ffffffff839abab8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839abab8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 sysctl_vslock(0,0) at sysctl_vslock+0x80 sys/kern/kern_sysctl.c:196 end trace frame: 0xffff80003c491d30, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837f9ff0) 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(ffffffff839abab8) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x50 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x50 sys/dev/kcov.c:153 __mp_lock(ffffffff839abab8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff839abab8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839abab8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 sysctl_vslock(0,0) at sysctl_vslock+0x80 sys/kern/kern_sysctl.c:196 sys_sysctl(ffff80002a2b9240,ffff80003c491e10,ffff80003c491d60) at sys_sysctl+0x371 sys/kern/kern_sysctl.c:301 syscall(ffff80003c491e10) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c491e10) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe995648200, count: -17 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7cdedcd28720, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cdedcd28720, count: -1