uvm_fault(0xfffffd806c1ce3e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81f21268 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff800034fe7040 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81f21268 Starting stack trace... panic(ffffffff833b3c24) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff800034fe6f90) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000147d000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003b4082b8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003b4082b8) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff800034fe7140) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80694376c0,81,fffffd80097fb4e0,ffff80003b4082b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c188910,ffff80003b4082b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c188910,ffff80003b4082b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c188910,ffff80003b4082b8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c188910,ffff80003b4082b8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003b4082b8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003b4082b8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003b4082b8,ffff800034fe74b0,ffff800034fe7400) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800034fe74b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034fe74b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72b038f2b490, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 32716 90365 0 0 0 1 syz-executor 408714 63608 0 0 0x4000000 0 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780f8b2c8490, 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(0xfffffd806c1ce3e8, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780f8b2c8490, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c437af0 rbx 0 rdx 0 rcx 0xffff80003c4a1cb8 rax 0x2a r8 0xffff80003c437a20 r9 0x1 r10 0x687f8669449a92e4 r11 0xe011be4aed7d39fb r12 0 r13 0xffffffff813cc8c8 Xdoreti+0x18 r14 0 r15 0 rip 0xffffffff82a2a4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c437a70 ss 0x10 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=32716 pid=90365 tcnt=2 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4a14f0,0xffff80003c4a0808 process=0xffff80002a3cce88 user=0xffff80003c432000, vmspace=0xfffffd806c1ce018 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *90365 32716 54184 0 7 0 syz-executor 90365 407075 54184 0 2 0x4000080 syz-executor 63608 102246 86519 0 2 0 syz-executor 63608 408714 86519 0 7 0x4000000 syz-executor 33635 491850 73859 0 2 0 syz-executor 33635 313481 73859 0 3 0x4000080 fsleep syz-executor 25842 89120 510 60929 2 0x10 syz-executor 25842 413806 510 60929 3 0x4000090 ttyin syz-executor 25842 361798 510 60929 3 0x4000090 lockf syz-executor 25842 471822 510 60929 3 0x4000090 ttyin syz-executor 10661 337427 27278 0 3 0x80 nanoslp syz-executor 10661 502405 27278 0 3 0x4000080 fifow syz-executor 10661 139752 27278 0 3 0x4000080 fifow syz-executor 10661 296019 27278 0 3 0x4000080 fsleep syz-executor 44895 421363 0 0 3 0x14280 nfsidl nfsio 97319 306630 0 0 3 0x14200 bored sosplice 73859 374549 37261 0 3 0x82 nanoslp syz-executor 56920 123457 37261 0 3 0x82 wait syz-executor 54184 303789 37261 0 2 0xc82 syz-executor 94169 85547 37261 0 3 0x2 biowait syz-executor 86519 46638 37261 0 2 0xc82 syz-executor 59198 170022 37261 0 3 0x82 nanoslp syz-executor 510 492570 37261 0 3 0x82 nanoslp syz-executor 27278 234704 37261 0 3 0x82 nanoslp syz-executor 37261 176018 66528 0 3 0x82 kqread syz-executor 66528 324996 47192 0 3 0x10008a sigsusp ksh 47192 515900 14473 0 3 0x98 kqread sshd-session 14473 501352 94957 0 3 0x92 kqread sshd-session 2459 463434 1 0 3 0x100083 ttyin getty 94957 209338 1 0 3 0x88 kqread sshd 61418 213104 36143 74 3 0x1100092 bpf pflogd 36143 42331 1 0 3 0x80 sbwait pflogd 40717 447962 38441 73 3 0x1100090 kqread syslogd 38441 402076 1 0 3 0x100082 sbwait syslogd 89025 74966 1 0 3 0x100080 kqread resolvd 21148 359679 88077 77 3 0x100092 kqread dhcpleased 81092 141009 88077 77 3 0x100092 kqread dhcpleased 88077 75012 1 0 3 0x80 kqread dhcpleased 19196 18910 0 0 3 0x14200 bored smr 93467 318356 0 0 2 0x14200 zerothread 84500 194416 0 0 3 0x14200 aiodoned aiodoned 27681 408618 0 0 3 0x14200 syncer update 87354 523209 0 0 3 0x14200 cleaner cleaner 14467 199745 0 0 3 0x14200 reaper reaper 62520 261954 0 0 3 0x14200 pgdaemon pagedaemon 73487 284835 0 0 3 0x14200 bored viomb 59973 123915 0 0 3 0x40014200 acpi0 acpi0 82182 33509 0 0 3 0x40014200 idle1 97373 52778 0 0 3 0x14200 bored softnet1 85181 176579 0 0 3 0x14200 netlock softnet0 37125 356091 0 0 2 0x40014200 systqmp 30729 146745 0 0 3 0x14200 bored systq 89290 343019 0 0 3 0x14200 tmoslp softclockmp 38798 82819 0 0 3 0x40014200 tmoslp softclock 30693 317815 0 0 3 0x40014200 idle0 1 105110 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 94169 (syz-executor) thread 0xffff8000fffefca0 (85547) exclusive rrwlock inode r = 0 (0xfffffd806be54a20) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:687 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c4e0d88) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 11072K 11325K 166960K 11765 0 pcb 19 13K 14K 166960K 170 0 rtable 234 10K 10K 166960K 503 0 pf 36 18K 22K 166960K 98 0 ifaddr 37 6K 7K 166960K 66 0 ifgroup 55 2K 2K 166960K 104 0 sysctl 3 1K 9K 166960K 8 0 counters 68 36K 38K 166960K 126 0 ioctlops 0 0K 4K 166960K 1564 0 iov 0 0K 16K 166960K 26 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1802 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 29 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 594 0 sigio 0 0K 0K 166960K 7 0 proc 72 115K 180K 166960K 571 0 subproc 72 4K 4K 166960K 76 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 65 0 in_multi 79 5K 7K 166960K 125 0 ether_multi 1 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 2 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 452 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 254 159K 169K 166960K 7547 0 UVM aobj 30 2K 2K 166960K 31 0 pinsyscall 42 84K 104K 166960K 1768 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 36 0 NDP 12 0K 2K 166960K 46 0 temp 48 8649K 8902K 166960K 22782 0 kqueue 13 20K 29K 166960K 121 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 80 0 77 1 0 1 1 0 8 0 rtentry 176 124 0 31 6 0 6 6 0 8 0 unpcb 144 558 0 538 5 1 4 5 0 8 3 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpcb 736 226 0 221 7 3 4 7 0 8 3 arp 136 21 0 4 1 0 1 1 0 8 0 inpcb 328 669 0 656 7 3 4 7 0 8 2 nd6 152 25 0 8 1 0 1 1 0 8 0 pkpcb 40 9 0 9 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 23 0 23 1 0 1 1 0 8 1 pppxif 1504 2 0 2 2 1 1 1 0 8 1 pfstscr 40 3 0 2 1 0 1 1 0 8 0 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 5 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 46 0 22 1 0 1 1 0 8 0 pfstkey 128 49 0 25 2 0 2 2 0 8 0 pfstate 384 45 0 23 4 0 4 4 0 8 0 pfrule 1344 27 0 20 2 0 2 2 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 518 0 116 29 2 27 29 0 8 1 art_table 40 522 0 116 5 0 5 5 0 8 0 art_node 32 124 0 40 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 3 2 1 1 1 0 8 0 semupl 112 4 0 4 2 1 1 1 0 8 1 semapl 112 26 0 16 1 0 1 1 0 8 0 shmpl 112 28 0 1 1 0 1 1 0 8 0 dirhash 1024 28 0 11 3 0 3 3 0 8 0 dino2pl 256 2626 0 1117 96 0 96 96 0 8 0 ffsino 296 2626 0 1117 118 0 118 118 0 8 0 nchpl 144 3477 0 2943 64 33 31 64 0 8 8 rtmask 32 5 0 5 1 1 0 1 0 8 0 vnodes 216 2842 0 0 158 0 158 158 0 8 0 namei 1024 11806 0 11806 2 1 1 2 0 8 1 percpumem 16 78 0 29 1 0 1 1 0 8 0 kstatmem 264 60 0 32 3 0 3 3 0 8 0 scxspl 216 20297 0 20296 10 3 7 8 1 8 6 plimitpl 152 91 0 72 1 0 1 1 0 8 0 sigapl 424 937 0 888 8 0 8 8 0 8 0 knotepl 120 517 0 0 16 0 16 16 0 8 0 kqueuepl 224 411 0 401 7 0 7 7 0 8 6 pipepl 344 165 0 137 3 0 3 3 0 8 0 fdescpl 528 900 0 869 3 0 3 3 0 8 0 filepl 160 5904 0 5670 17 0 17 17 0 8 6 lockfpl 104 131 0 127 1 0 1 1 0 8 0 lockfspl 48 57 0 54 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 39 0 22 1 0 1 1 0 8 0 ucredpl 104 1010 0 995 1 0 1 1 0 8 0 zombiepl 144 890 0 888 1 0 1 1 0 8 0 processpl 1232 937 0 888 6 1 5 6 0 8 0 procpl 664 1746 0 1688 8 2 6 8 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 752 1328 0 1292 16 5 11 15 0 8 7 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 135 0 0 17 0 17 17 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 303 0 0 18 0 18 18 0 8 0 bufpl 280 9080 0 2943 439 0 439 439 0 8 0 anonpl 32 10342 0 0 84 0 84 84 0 246 0 amapchunkpl 152 24193 0 23675 31 5 26 30 0 158 4 amappl16 200 4294 0 4261 30 13 17 24 0 8 8 amappl15 192 12 0 12 2 2 0 1 0 8 0 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 439 0 438 1 0 1 1 0 8 0 amappl12 168 1284 0 1242 3 0 3 3 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 50 0 36 1 0 1 1 0 8 0 amappl9 144 250 0 249 1 0 1 1 0 8 0 amappl8 136 30 0 28 1 0 1 1 0 8 0 amappl7 128 87 0 86 1 0 1 1 0 8 0 amappl6 120 296 0 283 1 0 1 1 0 8 0 amappl5 112 80 0 69 1 0 1 1 0 8 0 amappl4 104 438 0 407 1 0 1 1 0 8 0 amappl3 96 4088 0 3988 4 1 3 3 0 8 0 amappl2 88 1030 0 954 2 0 2 2 0 8 0 amappl1 80 11614 0 11021 14 0 14 14 0 8 0 amappl 88 6685 0 6511 5 0 5 5 0 92 0 uvmvnodes 80 2842 0 0 58 0 58 58 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 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 30 0 1 1 0 1 1 0 8 0 uaddrrnd 24 900 0 869 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 900 0 869 1 0 1 1 0 8 0 vmmpekpl 168 9197 0 9158 3 0 3 3 0 8 0 vmmpepl 168 66280 0 64341 108 3 105 105 0 357 11 vmsppl 488 899 0 869 6 1 5 5 0 8 1 rwobjpl 80 24313 0 20495 83 1 82 82 0 8 0 pdppl 4096 1807 0 1738 103 32 71 83 0 8 2 pvpl 32 16548 0 0 134 0 134 134 0 265 0 pmappl 256 899 0 869 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 293 0 41 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8387cff0) 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(ffffffff8391b820) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b820) 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 __mp_lock(ffffffff8391b820) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b820) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c44f300,ffff80000007aa80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_const_cmp4(fffffd806c1ce9a0,c000) at __sanitizer_cov_trace_const_cmp4+0x3f sys/dev/kcov.c:231 uvmfault_lookup(ffff80003c44f620,0) at uvmfault_lookup+0x133 sys/uvm/uvm_fault.c:1902 uvm_fault_check(ffff80003c44f620,ffff80003c44f658,ffff80003c44f690,0) at uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 uvm_fault(fffffd806c1ce9a0,c000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:633 end trace frame: 0xffff80003c44f770, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8387cff0) 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(ffffffff8391b820) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b820) 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 __mp_lock(ffffffff8391b820) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b820) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80003c44f300,ffff80000007aa80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_const_cmp4(fffffd806c1ce9a0,c000) at __sanitizer_cov_trace_const_cmp4+0x3f sys/dev/kcov.c:231 uvmfault_lookup(ffff80003c44f620,0) at uvmfault_lookup+0x133 sys/uvm/uvm_fault.c:1902 uvm_fault_check(ffff80003c44f620,ffff80003c44f658,ffff80003c44f690,0) at uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 uvm_fault(fffffd806c1ce9a0,c000,0,2) at uvm_fault+0x106 sys/uvm/uvm_fault.c:633 kpageflttrap(ffff80003c44f7d0,c5c0) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283 kerntrap(ffff80003c44f7d0) at kerntrap+0x198 sys/arch/amd64/amd64/trap.c:491 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x64 syscall(ffff80003c44fc10) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c44fc10) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6ef698ebf10, count: -20 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780f8b2c8490, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780f8b2c8490, count: -1