uvm_fault(0xfffffd806bee0b58, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8152ac20 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c424ee0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8152ac20 Starting stack trace... panic(ffffffff8332a419) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c424e30) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000013fd000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff8000ffff14a8) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000ffff14a8) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c424fe0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800acb6990,81,fffffd807f7d2680,ffff8000ffff14a8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bef0030,ffff8000ffff14a8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bef0030,ffff8000ffff14a8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bef0030,ffff8000ffff14a8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806bef0030,ffff8000ffff14a8) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff8000ffff14a8) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff8000ffff14a8,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff14a8,ffff80003c425350,ffff80003c4252a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c425350) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c425350) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ce7a95afd10, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -359408392 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 22783 60552 0 0x2 0 1 syz-executor 411253 49690 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x7cc5ea93dce0, 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(0xfffffd806bee0b58, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cc5ea93dce0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002ebecf30 rbx 0 rdx 0 rcx 0xffff80003c41e550 rax 0x3b r8 0xffff80002ebece60 r9 0x1 r10 0x306cff26a8d5192c r11 0x57c52d2f8b23fd00 r12 0 r13 0 r14 0xffff80003c41e550 r15 0 rip 0xffffffff81f083ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002ebeceb0 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=22783 pid=60552 tcnt=1 stat=onproc flags process=2 proc=0 runpri=84, usrpri=85, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4f1c70,0xffff80003c41ed10 process=0xffff80003c4be0c0 user=0xffff80002ebe7000, vmspace=0xfffffd806bee0798 estcpu=35, cpticks=1, pctcpu=0.3, user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11485 520950 60552 0 2 0 syz-executor 11485 243992 60552 0 3 0x4000080 fsleep syz-executor 32291 398121 44807 0 2 0 syz-executor 17822 14681 56332 0 2 0 syz-executor 17822 490664 56332 0 3 0x4000080 ttyin syz-executor 96541 427666 16024 0 2 0 syz-executor 96541 301406 16024 0 3 0x4000080 fsleep syz-executor 17734 452878 88117 0 2 0 syz-executor 17734 487927 88117 0 3 0x4000080 fsleep syz-executor 17734 164337 88117 0 3 0x4000080 fsleep syz-executor 17734 166160 88117 0 3 0x4000080 fsleep syz-executor 3751 87093 36598 0 3 0x80 nanoslp syz-executor 3751 98347 36598 0 3 0x4000080 kqpoll syz-executor 3751 179288 36598 0 3 0x4000080 fsleep syz-executor 3751 200873 36598 0 3 0x4000080 fsleep syz-executor 49019 50417 85916 0 2 0 syz-executor 49019 426743 85916 0 3 0x4000080 fsleep syz-executor *60552 22783 16695 0 7 0x2 syz-executor 36598 3697 16695 0 2 0x482 syz-executor 56332 205521 16695 0 2 0x482 syz-executor 5603 189543 16695 0 2 0x2 syz-executor 70937 1657 0 0 3 0x14280 nfsidl nfsio 20283 356264 0 0 3 0x14280 nfsidl nfsio 47372 482188 0 0 3 0x14280 nfsidl nfsio 64096 461151 0 0 3 0x14280 nfsidl nfsio 92596 128084 0 0 3 0x14280 nfsidl nfsio 99099 494454 0 0 3 0x14280 nfsidl nfsio 14022 238010 0 0 3 0x14280 nfsidl nfsio 68393 1371 0 0 3 0x14280 nfsidl nfsio 93806 186085 0 0 3 0x14280 nfsidl nfsio 36810 375945 0 0 3 0x14280 nfsidl nfsio 32978 295362 0 0 3 0x14280 nfsidl nfsio 57731 108099 0 0 3 0x14280 nfsidl nfsio 65918 425491 0 0 3 0x14280 nfsidl nfsio 813 511788 0 0 3 0x14280 nfsidl nfsio 67366 418184 0 0 3 0x14280 nfsidl nfsio 31079 389269 0 0 3 0x14280 nfsidl nfsio 8718 34617 0 0 3 0x14280 nfsidl nfsio 29123 31084 0 0 3 0x14280 nfsidl nfsio 84253 362037 0 0 3 0x14280 nfsidl nfsio 23970 332611 0 0 3 0x14280 nfsidl nfsio 44807 168946 16695 0 2 0x482 syz-executor 88117 331460 16695 0 2 0x482 syz-executor 82592 223902 1 0 3 0x100083 ttyin getty 85916 158357 16695 0 3 0x82 nanoslp syz-executor 16024 380045 16695 0 2 0x482 syz-executor 34396 176140 0 0 3 0x14200 bored sosplice 16695 106995 70761 0 3 0x82 kqread syz-executor 70761 244327 63030 0 3 0x10008a sigsusp ksh 63030 144785 54904 0 3 0x98 kqread sshd-session 54904 110824 41830 0 3 0x92 kqread sshd-session 41830 511534 1 0 3 0x88 kqread sshd 26409 139370 74646 74 3 0x1100092 bpf pflogd 74646 119407 1 0 3 0x80 sbwait pflogd 68264 389736 11678 73 3 0x1100090 kqread syslogd 11678 94217 1 0 3 0x100082 sbwait syslogd 26135 255174 1 0 3 0x100080 kqread resolvd 18032 485581 13258 77 3 0x100092 kqread dhcpleased 82340 209302 13258 77 3 0x100092 kqread dhcpleased 13258 234856 1 0 3 0x80 kqread dhcpleased 98486 50624 0 0 3 0x14200 bored smr 80594 503030 0 0 2 0x14200 zerothread 61010 58192 0 0 3 0x14200 aiodoned aiodoned 37508 406976 0 0 3 0x14200 syncer update 97696 39625 0 0 3 0x14200 cleaner cleaner 49690 411253 0 0 7 0x14200 reaper 73806 252530 0 0 3 0x14200 pgdaemon pagedaemon 52196 479932 0 0 3 0x14200 bored viomb 58385 464582 0 0 3 0x40014200 acpi0 acpi0 31902 118126 0 0 3 0x40014200 idle1 90051 197485 0 0 3 0x14200 bored softnet3 67679 181669 0 0 3 0x14200 bored softnet2 63765 130293 0 0 3 0x14200 bored softnet1 88872 89830 0 0 3 0x14200 netlock softnet0 38550 306916 0 0 2 0x40014200 systqmp 67345 192358 0 0 3 0x14200 bored systq 73853 103796 0 0 3 0x14200 tmoslp softclockmp 64791 466213 0 0 3 0x40014200 tmoslp softclock 75764 308212 0 0 3 0x40014200 idle0 1 278828 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 49690 (reaper) thread 0xffff8000ffffc528 (411253) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10247 11273K 11672K 166960K 20049 0 pcb 21 20K 22K 166960K 1228 0 rtable 209 12K 14K 166960K 1900 0 pf 34 17K 19K 166960K 466 0 ifaddr 36 7K 9K 166960K 396 0 ifgroup 55 2K 3K 166960K 686 0 sysctl 4 1K 5K 166960K 23 0 counters 64 36K 37K 166960K 676 0 ioctlops 0 0K 4K 166960K 2462 0 iov 0 0K 28K 166960K 423 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1426 90K 90K 166960K 6356 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 36K 40K 166960K 95 0 VM map 2 1K 1K 166960K 2 0 sem 24 33K 53K 166960K 115 0 dirhash 15 2K 3K 166960K 111 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 114K 166960K 5531 0 sigio 0 0K 0K 166960K 320 0 proc 73 91K 152K 166960K 2023 0 subproc 72 4K 4K 166960K 378 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1054 0 in_multi 73 5K 7K 166960K 653 0 ether_multi 1 0K 0K 166960K 41 0 mrt 1 0K 0K 166960K 23 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 1789 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 10 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 250 168K 202K 166960K 50222 0 UVM aobj 45 5K 6K 166960K 54 0 pinsyscall 43 86K 106K 166960K 7619 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 295 0 NDP 12 0K 2K 166960K 284 0 temp 82 8688K 9012K 166960K 220231 0 kqueue 14 22K 32K 166960K 822 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 120 738 0 735 11 10 1 3 0 8 0 rtentry 176 618 0 537 6 0 6 6 0 8 0 unpcb 144 4894 0 4877 31 29 2 6 0 8 1 syncache 336 21 0 21 6 6 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 808 1788 0 1779 47 45 2 11 0 8 0 arp 128 97 0 80 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 384 6424 0 6407 64 56 8 15 0 8 6 nd6 144 146 0 128 2 0 2 2 0 8 1 pkpcb 40 45 0 45 8 8 0 1 0 8 0 kcovpl 48 42 0 34 1 0 1 1 0 8 0 ppxss 1192 202 0 202 5 4 1 1 0 8 1 pppxif 1504 52 0 52 10 9 1 1 0 8 1 pffrag 232 72 0 66 1 0 1 1 0 482 0 pffrnode 88 71 0 66 1 0 1 1 0 8 0 pffrent 40 205 0 199 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 pfstitem 24 296 0 241 1 0 1 1 0 8 0 pfstkey 128 296 0 241 4 0 4 4 0 8 0 pfstate 384 296 0 241 11 1 10 11 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 2487 0 2129 39 13 26 29 0 8 2 art_table 32 2491 0 2129 4 0 4 4 0 8 1 art_node 16 589 0 517 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 13 2 1 1 1 0 8 0 semupl 112 4 0 4 4 4 0 1 0 8 0 semapl 112 100 0 78 1 0 1 1 0 8 0 shmpl 112 51 0 9 2 0 2 2 0 8 0 dirhash 1024 85 0 66 3 0 3 3 0 8 0 dino2pl 256 11164 0 9586 100 1 99 99 0 8 0 ffsino 288 11164 0 9586 113 0 113 113 0 8 0 nchpl 144 18330 0 17684 64 39 25 64 0 8 0 rtmask 32 25 0 25 7 7 0 1 0 8 0 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 71650 0 71650 6 5 1 2 0 8 1 percpumem 16 352 0 306 1 0 1 1 0 8 0 kstatmem 264 396 0 372 6 4 2 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 19 0 19 9 9 0 1 0 8 0 scxspl 216 55123 0 55123 20 19 1 8 1 8 1 plimitpl 152 1003 0 985 1 0 1 1 0 8 0 sigapl 424 5878 0 5807 16 7 9 11 0 8 0 futexpl 64 78531 0 78523 1 0 1 1 0 8 0 knotepl 120 981 0 0 30 0 30 30 0 8 0 kqueuepl 224 2018 0 2004 20 18 2 5 0 8 0 pipepl 336 659 0 632 3 0 3 3 0 8 0 fdescpl 520 5762 0 5730 3 0 3 3 0 8 0 filepl 160 42430 0 42203 54 42 12 21 0 8 0 lockfpl 104 1727 0 1725 2 1 1 2 0 8 0 lockfspl 48 596 0 594 1 0 1 1 0 8 0 sessionpl 144 77 0 68 1 0 1 1 0 8 0 pgrppl 48 315 0 298 1 0 1 1 0 8 0 ucredpl 104 8118 0 8104 1 0 1 1 0 8 0 zombiepl 144 5808 0 5807 1 0 1 1 0 8 0 processpl 1192 5878 0 5807 8 2 6 8 0 8 0 procpl 656 14217 0 14136 11 3 8 9 0 8 0 srpgc 96 32 0 32 8 8 0 1 0 8 0 sosppl 168 27 0 27 8 8 0 1 0 8 0 sockpl 728 12161 0 12124 97 88 9 22 0 8 4 mcl64k 65536 9 0 0 2 0 2 2 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 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 16 0 16 16 0 8 0 mcl2k 2048 66 0 0 6 0 6 6 0 8 0 mtagpl 96 325 0 0 8 0 8 8 0 8 0 mbufpl 256 951 0 0 55 0 55 55 0 8 0 bufpl 280 16904 0 10761 440 1 439 440 0 8 0 anonpl 24 621166 0 617501 117 75 42 55 0 184 0 amapchunkpl 152 179162 0 178638 83 59 24 37 0 158 3 amappl16 200 10451 0 10417 73 67 6 16 0 8 0 amappl15 192 41 0 41 4 4 0 1 0 8 0 amappl14 184 226 0 214 1 0 1 1 0 8 0 amappl13 176 8 0 7 1 0 1 1 0 8 0 amappl12 168 6991 0 6960 4 2 2 3 0 8 0 amappl11 160 75 0 61 1 0 1 1 0 8 0 amappl10 152 5 0 5 3 3 0 1 0 8 0 amappl9 144 254 0 253 2 1 1 1 0 8 0 amappl8 136 63 0 60 1 0 1 1 0 8 0 amappl7 128 199 0 185 1 0 1 1 0 8 0 amappl6 120 540 0 536 1 0 1 1 0 8 0 amappl5 112 274 0 264 1 0 1 1 0 8 0 amappl4 104 501 0 479 1 0 1 1 0 8 0 amappl3 96 35723 0 35604 4 0 4 4 0 8 0 amappl2 88 1299 0 1235 2 0 2 2 0 8 0 amappl1 80 36358 0 35746 18 0 18 18 0 8 0 amappl 88 47797 0 47623 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 258 0 258 6 6 0 1 0 8 0 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 53 0 9 1 0 1 1 0 8 0 uaddrrnd 24 5762 0 5730 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5762 0 5730 1 0 1 1 0 8 0 vmmpekpl 168 42474 0 42401 4 0 4 4 0 8 0 vmmpepl 168 356746 0 354664 144 44 100 115 0 357 0 vmsppl 480 5761 0 5730 5 0 5 5 0 8 0 rwobjpl 72 88310 0 81380 142 9 133 135 0 8 0 pdppl 4096 11532 0 11460 242 168 74 86 0 8 2 pvpl 32 17962 0 0 145 0 145 145 0 265 0 pmappl 256 5761 0 5730 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 654 0 244 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837b8ff0) 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(ffffffff8393e568) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a250ab0,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_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(ffffffff8393e568) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x39 sys/dev/kcov.c:159 mtx_enter(ffffffff83823710) at mtx_enter+0x60 sys/kern/kern_lock.c:239 msleep(ffffffff83914608,ffffffff83823710,4,ffffffff833d12de,0) at msleep+0x2cf sys/kern/kern_synch.c:237 reaper(ffff8000ffffc528) at reaper+0x14b sys/kern/kern_exit.c:451 end trace frame: 0x0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff837b8ff0) 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(ffffffff8393e568) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a250ab0,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:553 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_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(ffffffff8393e568) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8393e568) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 softintr_dispatch(0) at softintr_dispatch+0x5b sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x39 sys/dev/kcov.c:159 mtx_enter(ffffffff83823710) at mtx_enter+0x60 sys/kern/kern_lock.c:239 msleep(ffffffff83914608,ffffffff83823710,4,ffffffff833d12de,0) at msleep+0x2cf sys/kern/kern_synch.c:237 reaper(ffff8000ffffc528) at reaper+0x14b sys/kern/kern_exit.c:451 end trace frame: 0x0, 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: 0x7cc5ea93dce0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7cc5ea93dce0, count: -1