uvm_fault(0xfffffd806a1af1f8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81cdae90 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002f0922d0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81cdae90 Starting stack trace... panic(ffffffff83334306) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002f092220) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001485000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e63,41,2000,ffff80002a30d750) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e63,41,2000,ffff80002a30d750) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002f0923d0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805cf111c0,41,fffffd807f7d3068,ffff80002a30d750) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c1af660,ffff80002a30d750) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c1af660,ffff80002a30d750) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c1af660,ffff80002a30d750) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806c1af660,ffff80002a30d750) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a30d750) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a30d750,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a30d750,ffff80002f092740,ffff80002f092690) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002f092740) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002f092740) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ddf32afd5d0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x680 TID PID UID PRFLAGS PFLAGS CPU COMMAND *375241 44118 0 0 0 1 syz-executor 264450 23246 0 0x2 0 0 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x72cd9a33c470, 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(0xfffffd806a1af1f8, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x72cd9a33c470, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2d2650 rbx 0 rdx 0 rcx 0xffff80002a30c7f0 rax 0x2a r8 0xffff80002a2d2580 r9 0x1 r10 0xa7c6ce3bfe477b76 r11 0xb8537c6e17c4d40f r12 0 r13 0xffffffff81309378 Xdoreti+0x18 r14 0 r15 0 rip 0xffffffff812a34c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80002a2d25d0 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=375241 pid=44118 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a30d750,0xffff80002a30dc80 process=0xffff80003c462aa0 user=0xffff80002a2cd000, vmspace=0xfffffd807eb8c1e0 estcpu=36, cpticks=7, pctcpu=0.0, user=5, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21662 137959 10920 0 2 0 syz-executor 21662 132476 10920 0 3 0x4000080 fsleep syz-executor *44118 375241 65569 0 7 0 syz-executor 44118 258479 65569 0 3 0x4000080 kqread syz-executor 44118 501648 65569 0 2 0x4000000 syz-executor 10786 167771 33565 0 2 0 syz-executor 10786 246633 33565 0 3 0x4000080 kqsel syz-executor 18970 25019 71151 0 3 0x2 biowait syz-executor 23246 264450 71151 0 7 0x2 syz-executor 10416 84092 0 0 3 0x14280 nfsidl nfsio 19111 189396 0 0 3 0x14280 nfsidl nfsio 15151 237619 0 0 3 0x14280 nfsidl nfsio 6195 297236 0 0 3 0x14280 nfsidl nfsio 25407 54994 0 0 3 0x14280 nfsidl nfsio 14869 233424 0 0 3 0x14280 nfsidl nfsio 53161 344171 0 0 3 0x14280 nfsidl nfsio 5546 466298 0 0 3 0x14280 nfsidl nfsio 23207 189853 0 0 3 0x14280 nfsidl nfsio 55235 186695 0 0 3 0x14280 nfsidl nfsio 1208 318857 0 0 3 0x14280 nfsidl nfsio 37489 195091 0 0 3 0x14280 nfsidl nfsio 5905 8647 0 0 3 0x14280 nfsidl nfsio 18605 448027 0 0 3 0x14280 nfsidl nfsio 49769 2506 0 0 3 0x14280 nfsidl nfsio 28379 44218 0 0 3 0x14280 nfsidl nfsio 52086 209640 0 0 3 0x14280 nfsidl nfsio 69489 396148 0 0 3 0x14280 nfsidl nfsio 60906 456984 0 0 3 0x14280 nfsidl nfsio 30216 328895 0 0 3 0x14280 nfsidl nfsio 65569 44109 71151 0 3 0x82 nanoslp syz-executor 20845 376026 90971 0 3 0x82 sbwait sshd-session 33565 14604 71151 0 3 0x82 nanoslp syz-executor 44767 211318 71151 0 3 0x82 nanoslp syz-executor 74586 171496 71151 0 3 0x82 piperd syz-executor 45104 496859 1 0 3 0x100083 ttyin getty 67178 453927 0 0 3 0x14200 bored sosplice 55498 236861 71151 0 3 0x82 nanoslp syz-executor 10920 164347 71151 0 3 0x82 nanoslp syz-executor 71151 332187 11342 0 2 0x3 syz-executor 11342 415528 75371 0 3 0x10008a sigsusp ksh 75371 214441 95673 0 3 0x98 kqread sshd-session 95673 373714 90971 0 3 0x92 kqread sshd-session 90971 224476 1 0 3 0x88 kqread sshd 29807 153648 93944 74 3 0x1100092 bpf pflogd 93944 443637 1 0 3 0x80 sbwait pflogd 72731 172081 43972 73 3 0x1100090 kqread syslogd 43972 183844 1 0 3 0x100082 sbwait syslogd 40178 427884 1 0 3 0x100080 kqread resolvd 58141 387755 98666 77 3 0x100092 kqread dhcpleased 42315 258155 98666 77 3 0x100092 kqread dhcpleased 98666 224842 1 0 3 0x80 kqread dhcpleased 2601 230144 0 0 3 0x14200 bored smr 6471 440776 0 0 2 0x14200 zerothread 54150 206500 0 0 3 0x14200 aiodoned aiodoned 95475 455653 0 0 3 0x14200 syncer update 75719 256678 0 0 3 0x14200 cleaner cleaner 45590 211634 0 0 3 0x14200 reaper reaper 60941 264752 0 0 3 0x14200 pgdaemon pagedaemon 37908 317465 0 0 3 0x14200 bored viomb 31294 357218 0 0 3 0x40014200 acpi0 acpi0 97109 319224 0 0 3 0x40014200 idle1 69020 406530 0 0 3 0x14200 bored softnet3 63597 206642 0 0 3 0x14200 bored softnet2 67487 341932 0 0 3 0x14200 bored softnet1 23912 15015 0 0 3 0x14200 netlock softnet0 27323 146613 0 0 2 0x40014200 systqmp 11233 327461 0 0 3 0x14200 bored systq 12875 201578 0 0 3 0x14200 tmoslp softclockmp 34853 517780 0 0 3 0x40014200 tmoslp softclock 26462 520768 0 0 3 0x40014200 idle0 1 422302 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 18970 (syz-executor) thread 0xffff80002cbd22c8 (25019) Process 23246 (syz-executor) thread 0xffff80002a30d4c0 (264450) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10214 11061K 11715K 166960K 12523 0 pcb 19 16K 17K 166960K 356 0 rtable 209 10K 10K 166960K 681 0 pf 36 17K 18K 166960K 152 0 ifaddr 39 6K 7K 166960K 124 0 ifgroup 57 2K 2K 166960K 205 0 sysctl 4 1K 9K 166960K 86 0 counters 70 37K 37K 166960K 334 0 ioctlops 0 0K 4K 166960K 1901 0 iov 0 0K 16K 166960K 256 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1436 90K 91K 166960K 2264 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 16 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 64 0 dirhash 15 2K 3K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 1350 0 sigio 0 0K 0K 166960K 67 0 proc 72 91K 128K 166960K 866 0 subproc 72 4K 4K 166960K 127 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 174 0 in_multi 76 5K 7K 166960K 209 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 14 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 769 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 235 169K 176K 166960K 14328 0 UVM aobj 13 2K 2K 166960K 15 0 pinsyscall 43 86K 104K 166960K 2631 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 78 0 NDP 15 0K 1K 166960K 85 0 temp 82 8672K 8740K 166960K 47717 0 kqueue 16 24K 30K 166960K 253 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 120 176 0 173 3 2 1 3 0 8 0 rtentry 176 223 0 135 6 2 4 6 0 8 0 unpcb 144 1365 0 1346 9 7 2 6 0 8 1 syncache 336 8 0 8 4 4 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 808 405 0 395 11 3 8 8 0 8 7 arp 128 38 0 19 1 0 1 1 0 8 0 inpcb 384 1560 0 1544 28 12 16 21 0 8 14 nd6 144 45 0 25 1 0 1 1 0 8 0 pkpcb 40 21 0 21 2 1 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 ppxss 1192 111 0 109 2 1 1 1 0 8 0 pppxif 1504 73 0 73 3 2 1 1 0 8 1 pffrag 232 10 0 2 1 0 1 1 0 482 0 pffrnode 88 9 0 2 1 0 1 1 0 8 0 pffrent 40 14 0 6 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 24 112 0 38 1 0 1 1 0 8 0 pfstkey 128 112 0 38 3 0 3 3 0 8 0 pfstate 384 112 0 38 9 1 8 8 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 899 0 537 32 9 23 29 0 8 0 art_table 32 902 0 537 4 1 3 4 0 8 0 art_node 16 213 0 134 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 12 2 1 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 61 0 51 1 0 1 1 0 8 0 shmpl 112 12 0 2 1 0 1 1 0 8 0 dirhash 1024 44 0 25 3 0 3 3 0 8 0 dino2pl 256 3769 0 2252 96 0 96 96 0 8 0 ffsino 288 3769 0 2252 109 0 109 109 0 8 0 nchpl 144 5568 0 3861 64 0 64 64 0 8 0 rtmask 32 5 0 4 3 2 1 1 0 8 0 uvmvnodes 80 4268 0 0 88 0 88 88 0 8 0 vnodes 216 4268 0 0 238 0 238 238 0 8 0 namei 1024 20340 0 20340 6 5 1 2 0 8 1 percpumem 16 182 0 132 1 0 1 1 0 8 0 kstatmem 264 116 0 88 3 1 2 3 0 8 0 scxspl 216 16548 0 16547 11 10 1 8 1 8 0 plimitpl 152 328 0 311 1 0 1 1 0 8 0 sigapl 424 1670 0 1600 10 1 9 9 0 8 0 knotepl 120 593 0 0 18 0 18 18 0 8 0 kqueuepl 224 469 0 456 6 5 1 5 0 8 0 pipepl 336 248 0 221 5 1 4 5 0 8 0 fdescpl 520 1629 0 1598 3 0 3 3 0 8 0 filepl 160 10917 0 10689 28 10 18 20 0 8 7 lockfpl 104 595 0 593 3 2 1 2 0 8 0 lockfspl 48 146 0 144 1 0 1 1 0 8 0 sessionpl 144 36 0 26 1 0 1 1 0 8 0 pgrppl 48 103 0 85 1 0 1 1 0 8 0 ucredpl 104 1098 0 1084 1 0 1 1 0 8 0 zombiepl 144 2282 0 2280 1 0 1 1 0 8 0 processpl 1208 1670 0 1600 6 0 6 6 0 8 0 procpl 656 3635 0 3561 9 1 8 8 0 8 0 srpgc 96 14 0 14 3 2 1 1 0 8 1 sosppl 168 10 0 10 4 3 1 1 0 8 1 sockpl 728 3141 0 3103 42 29 13 22 0 8 9 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 28 0 0 4 0 4 4 0 8 0 mtagpl 96 18 0 0 1 0 1 1 0 8 0 mbufpl 256 217 0 0 14 0 14 14 0 8 0 bufpl 280 4353 0 127 302 0 302 302 0 8 0 anonpl 32 9144 0 0 74 0 74 74 0 246 0 amapchunkpl 152 46643 0 46144 46 18 28 32 0 158 3 amappl16 200 3832 0 3780 24 9 15 16 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 175 0 161 1 0 1 1 0 8 0 amappl13 176 16 0 16 1 1 0 1 0 8 0 amappl12 168 2377 0 2347 4 2 2 3 0 8 0 amappl11 160 73 0 59 1 0 1 1 0 8 0 amappl10 152 79 0 79 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 23 0 20 1 0 1 1 0 8 0 amappl7 128 126 0 112 1 0 1 1 0 8 0 amappl6 120 247 0 242 1 0 1 1 0 8 0 amappl5 112 147 0 138 1 0 1 1 0 8 0 amappl4 104 364 0 342 1 0 1 1 0 8 0 amappl3 96 9323 0 9223 5 1 4 4 0 8 0 amappl2 88 776 0 706 2 0 2 2 0 8 0 amappl1 80 14753 0 14072 17 2 15 15 0 8 0 amappl 88 13223 0 13069 5 0 5 5 0 92 0 dma16384 16384 2 0 2 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 3 0 2 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 72 0 72 3 3 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 14 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1629 0 1598 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1629 0 1598 1 0 1 1 0 8 0 vmmpekpl 168 14328 0 14268 3 0 3 3 0 8 0 vmmpepl 168 107092 0 105024 107 4 103 103 0 357 5 vmsppl 480 1628 0 1598 6 1 5 5 0 8 0 rwobjpl 72 33235 0 27914 99 1 98 98 0 8 0 pdppl 4096 3266 0 3196 122 46 76 86 0 8 6 pvpl 32 16483 0 0 133 0 133 133 0 265 0 pmappl 256 1628 0 1598 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 436 0 71 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83889ff0) 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(ffffffff839eaca8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003c42c200,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc intr_handler(ffff80003c42c370,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff839eaca8,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 yield() at yield+0x6a sys/kern/sched_bsd.c:320 pool_get(ffffffff838d3400,1) at pool_get+0x265 sys/kern/subr_pool.c:593 end trace frame: 0xffff80003c42c630, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83889ff0) 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(ffffffff839eaca8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80003c42c200,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc intr_handler(ffff80003c42c370,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff839eaca8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff839eaca8,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 yield() at yield+0x6a sys/kern/sched_bsd.c:320 pool_get(ffffffff838d3400,1) at pool_get+0x265 sys/kern/subr_pool.c:593 uvm_mapent_alloc(fffffd807eb8c000,0) at uvm_mapent_alloc+0x35a sys/uvm/uvm_map.c:-1 uvm_map_mkentry(fffffd807eb8c000,fffffd806a1be808,fffffd806a1be808,61801c69000,1000,0,2d52c147dc6ca040,1000) at uvm_map_mkentry+0x87 sys/uvm/uvm_map.c:-1 uvm_mapent_clone(fffffd807eb8c000,61801c69000,1000,0,3,7,e08abf03994ad7a8,fffffd8069fa4d88,ffff80003c42c828,fffffd8069fa4d88) at uvm_mapent_clone+0xba sys/uvm/uvm_map.c:3549 uvm_mapent_forkzero(3,fffffd807eb8c000,0,fffffd8069fa4d88,ffff80003c42c828) at uvm_mapent_forkzero+0x67 sys/uvm/uvm_map.c:3768 uvmspace_fork(ffff8000fffec988) at uvmspace_fork+0x265 sys/uvm/uvm_map.c:3848 process_new(ffff80002a30ca80,ffff8000fffec988,1) at process_new+0x572 sys/kern/kern_fork.c:282 fork1(ffff80002a30d4c0,1,ffffffff8164a670,0,ffff80003c42ca00,0) at fork1+0x3ea sys/kern/kern_fork.c:408 syscall(ffff80003c42cab0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c42cab0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d38ab64ddd0, count: -23 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x680 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x72cd9a33c470, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x72cd9a33c470, count: -1