uvm_fault(0xfffffd806c1f1d70, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff831f9a38 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c47f9a0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff831f9a38 Starting stack trace... panic(ffffffff833c6b8d) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c47f8f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001464000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff800037bfba28) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff800037bfba28) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c47faa0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8057a37de0,81,fffffd80097fb478,ffff800037bfba28) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805885e500,ffff800037bfba28) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805885e500,ffff800037bfba28) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805885e500,ffff800037bfba28) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805885e500,ffff800037bfba28) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800037bfba28) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800037bfba28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800037bfba28,ffff80003c47fe10,ffff80003c47fd60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c47fe10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c47fe10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x742a9e9a3b60, 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 *449826 6380 0 0 0x4000000 1 syz-executor 285866 31281 0 0x2 0x1 0 syz-executor proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x81e4eda7870, 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(0xfffffd806c1f1d70, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x81e4eda7870, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c43f470 rbx 0 rdx 0 rcx 0xffff80003c481250 rax 0x2a r8 0xffff80003c43f3a0 r9 0x1 r10 0xab8d013ac7fac67a r11 0xa324aaea53f2e39e r12 0 r13 0 r14 0 r15 0 rip 0xffffffff818fb4c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c43f3f0 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=449826 pid=6380 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800037bfb4f8,0xffffffff839ef390 process=0xffff800037bfc020 user=0xffff80003c43a000, vmspace=0xfffffd806c1f13e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6380 280632 25974 0 2 0 syz-executor * 6380 449826 25974 0 7 0x4000000 syz-executor 65493 63973 75777 0 2 0x82000 syz-executor 65493 255946 75777 0 3 0x4002000 suspend syz-executor 65493 494631 75777 0 2 0x4082000 syz-executor 78438 456811 903 0 2 0 syz-executor 78438 37065 903 0 2 0x4000000 syz-executor 45037 454726 9859 0 2 0 syz-executor 45037 149790 9859 0 2 0x4000000 syz-executor 45037 57668 9859 0 3 0x4000080 fsleep syz-executor 45037 62663 9859 0 2 0x4000000 syz-executor 97788 343914 31281 0 2 0 syz-executor 97788 288192 31281 0 3 0x4000080 fsleep syz-executor 56084 55834 1320 0 3 0x80 nanoslp syz-executor 56084 313549 1320 0 3 0x4000080 kqsel syz-executor 56084 429889 1320 0 3 0x4000080 fsleep syz-executor 56084 43058 1320 0 3 0x4000080 fsleep syz-executor 44957 19760 52362 0 2 0x1 syz-executor 44957 262931 52362 0 3 0x4000080 fsleep syz-executor 44957 361905 52362 0 3 0x4000080 nanoslp syz-executor 903 512977 2843 0 2 0x3 syz-executor 9859 49909 2843 0 2 0x3 syz-executor 75777 249449 2843 0 2 0x3 syz-executor 50841 6073 0 0 3 0x14200 acct acct 59425 335807 2843 0 2 0x3 syz-executor 13157 45168 1 0 3 0x100083 ttyopn getty 25974 72088 2843 0 3 0x82 nanoslp syz-executor 31281 285866 2843 0 7 0x3 syz-executor 52362 96632 2843 0 2 0x3 syz-executor 1320 300322 2843 0 2 0x3 syz-executor 2843 240899 32981 0 3 0x82 kqread syz-executor 32981 396323 86333 0 3 0x10008a sigsusp ksh 86333 47659 63085 0 3 0x98 kqread sshd-session 63085 435539 18088 0 3 0x92 kqread sshd-session 18088 144330 1 0 3 0x88 kqread sshd 60406 66358 35972 74 3 0x1100092 bpf pflogd 35972 163151 1 0 3 0x80 sbwait pflogd 80303 139917 32942 73 3 0x1100090 kqread syslogd 32942 386922 1 0 3 0x100082 sbwait syslogd 51764 443382 1 0 3 0x100080 kqread resolvd 10665 490389 8443 77 3 0x100092 kqread dhcpleased 11969 433013 8443 77 3 0x100092 kqread dhcpleased 8443 303979 1 0 3 0x80 kqread dhcpleased 47950 513284 0 0 3 0x14200 bored smr 62506 437594 0 0 2 0x14200 zerothread 96418 398004 0 0 3 0x14200 aiodoned aiodoned 62419 461888 0 0 3 0x14200 syncer update 50828 149868 0 0 3 0x14200 cleaner cleaner 29589 474485 0 0 2 0x14200 reaper 89893 193628 0 0 3 0x14200 pgdaemon pagedaemon 59171 479181 0 0 3 0x14200 bored viomb 84885 359080 0 0 3 0x40014200 acpi0 acpi0 76095 327331 0 0 3 0x40014200 idle1 95400 249553 0 0 3 0x14200 bored softnet1 20503 305539 0 0 3 0x14200 netlock softnet0 27787 477749 0 0 2 0x40014200 systqmp 63891 397534 0 0 3 0x14200 bored systq 78578 381894 0 0 3 0x14200 tmoslp softclockmp 20051 181917 0 0 3 0x40014200 tmoslp softclock 20258 284906 0 0 3 0x40014200 idle0 1 236247 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 78438 (syz-executor) thread 0xffff80003c480fb8 (37065) exclusive rwlock fdlock r = 0 (0xffff8000357f88b0) #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 doopenat+0x18e sys/kern/vfs_syscalls.c:1105 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #4 Xsyscall+0x128 Process 45037 (syz-executor) thread 0xffff800037bfb790 (62663) exclusive rwlock vmmaplk r = 0 (0xfffffd806c1f16d0) #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:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:622 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10243 11118K 11302K 166960K 13171 0 pcb 18 16K 18K 166960K 395 0 rtable 202 11K 12K 166960K 771 0 pf 35 17K 82K 166960K 225 0 ifaddr 36 6K 9K 166960K 158 0 ifgroup 51 2K 3K 166960K 260 0 sysctl 4 1K 9K 166960K 80 0 counters 66 36K 38K 166960K 408 0 ioctlops 0 0K 4K 166960K 2029 0 iov 0 0K 16K 166960K 152 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1364 86K 86K 166960K 2858 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 18 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 93 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1955 0 sigio 0 0K 0K 166960K 34 0 proc 73 115K 164K 166960K 928 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 317 0 in_multi 67 5K 7K 166960K 240 0 ether_multi 1 0K 0K 166960K 26 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 652 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 268 173K 182K 166960K 19699 0 UVM aobj 109 6K 6K 166960K 112 0 pinsyscall 43 86K 102K 166960K 3207 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 143 0 NDP 11 0K 2K 166960K 108 0 temp 82 8660K 8785K 166960K 103566 0 kqueue 14 22K 31K 166960K 377 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 120 229 0 226 2 1 1 2 0 8 0 rtentry 176 227 0 152 6 1 5 6 0 8 0 unpcb 144 1954 0 1937 19 15 4 10 0 8 3 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 674 0 669 19 18 1 7 0 8 0 arp 136 38 0 22 1 0 1 1 0 8 0 inpcb 328 2327 0 2317 33 26 7 12 0 8 5 nd6 152 42 0 26 1 0 1 1 0 8 0 pkpcb 40 50 0 50 3 2 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 2 0 2 1 1 0 1 0 8 0 ppxss 1192 146 0 146 3 2 1 1 0 8 1 pppxif 1504 8 0 8 3 3 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 20 0 14 1 0 1 1 0 482 0 pffrnode 88 12 0 7 1 0 1 1 0 8 0 pffrent 40 36 0 30 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 3 0 3 3 2 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 120 0 70 1 0 1 1 0 8 0 pfstkey 128 126 0 77 3 0 3 3 0 8 0 pfstate 384 120 0 73 7 0 7 7 0 8 0 pfrule 1344 27 0 21 2 1 1 2 0 8 0 rttmr 136 7 0 7 5 4 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1091 0 800 37 14 23 31 0 8 1 art_table 40 1095 0 800 5 0 5 5 0 8 0 art_node 32 225 0 161 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 13 1 0 1 1 0 8 0 semapl 112 87 0 77 1 0 1 1 0 8 0 shmpl 112 109 0 3 4 0 4 4 0 8 0 dirhash 1024 43 0 26 3 0 3 3 0 8 0 dino2pl 256 5028 0 3505 96 0 96 96 0 8 0 ffsino 296 5028 0 3505 118 0 118 118 0 8 0 nchpl 144 7845 0 6130 64 0 64 64 0 8 0 rtmask 32 15 0 15 6 5 1 1 0 8 1 vnodes 216 5852 0 0 326 0 326 326 0 8 0 namei 1024 27573 0 27573 9 7 2 4 0 8 2 percpumem 16 219 0 171 1 0 1 1 0 8 0 kstatmem 264 168 0 142 5 2 3 3 0 8 1 scsiplug 72 5 0 5 4 4 0 1 0 8 0 scxspl 216 48432 0 48432 11 9 2 6 1 8 2 plimitpl 152 439 0 421 1 0 1 1 0 8 0 sigapl 424 2231 0 2182 7 1 6 7 0 8 0 knotepl 120 555 0 0 17 0 17 17 0 8 0 kqueuepl 224 649 0 638 4 3 1 3 0 8 0 pipepl 344 607 0 580 17 14 3 9 0 8 0 fdescpl 528 2209 0 2177 3 0 3 3 0 8 0 filepl 160 15930 0 15706 34 20 14 23 0 8 0 lockfpl 104 772 0 747 1 0 1 1 0 8 0 lockfspl 48 325 0 300 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 87 0 70 1 0 1 1 0 8 0 ucredpl 104 2616 0 2603 1 0 1 1 0 8 0 zombiepl 144 3017 0 3016 1 0 1 1 0 8 0 processpl 1232 2231 0 2182 5 0 5 5 0 8 0 procpl 664 5459 0 5396 8 1 7 7 0 8 0 sosppl 176 22 0 22 4 4 0 1 0 8 0 sockpl 752 4660 0 4630 69 59 10 28 0 8 5 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 48 0 0 5 0 5 5 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1872 0 0 115 0 115 115 0 8 0 bufpl 280 19930 0 13793 439 0 439 439 0 8 0 anonpl 32 16801 0 0 135 0 135 135 0 246 0 amapchunkpl 152 67352 0 66704 50 20 30 38 0 158 0 amappl16 200 8436 0 8394 66 49 17 35 0 8 3 amappl15 192 7 0 5 1 0 1 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 492 0 491 1 0 1 1 0 8 0 amappl12 168 2619 0 2576 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 101 0 86 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 48 0 45 1 0 1 1 0 8 0 amappl7 128 114 0 113 1 0 1 1 0 8 0 amappl6 120 349 0 335 1 0 1 1 0 8 0 amappl5 112 86 0 75 1 0 1 1 0 8 0 amappl4 104 481 0 451 1 0 1 1 0 8 0 amappl3 96 11798 0 11699 4 1 3 3 0 8 0 amappl2 88 2317 0 2239 2 0 2 2 0 8 0 amappl1 80 16937 0 16346 14 1 13 14 0 8 0 amappl 88 18561 0 18374 5 0 5 5 0 92 0 uvmvnodes 80 5852 0 0 120 0 120 120 0 8 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 8 0 8 3 3 0 1 0 8 0 dma128 128 254 0 254 2 2 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 72 111 0 3 2 0 2 2 0 8 0 uaddrrnd 24 2209 0 2177 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2209 0 2177 1 0 1 1 0 8 0 vmmpekpl 168 19925 0 19881 3 0 3 3 0 8 0 vmmpepl 168 145479 0 143464 135 26 109 117 0 357 8 vmsppl 488 2208 0 2177 6 1 5 5 0 8 0 rwobjpl 80 45820 0 38902 148 0 148 148 0 8 0 pdppl 4096 4426 0 4354 116 44 72 84 0 8 0 pvpl 32 24444 0 0 197 0 197 197 0 265 0 pmappl 256 2208 0 2177 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 436 0 91 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83877ff0) 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(ffffffff8389d020) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) 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(ffffffff8389d020) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) at __mp_lock+0x192 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(ffffffff8389d020) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff8000ffff2a78,5b,10,ffff80002a3b0900) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000ffff2a78,5b,10,ffff80002a3b0900) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a3b0900) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a3b0900) at syscall+0x304 sys/arch/amd64/amd64/trap.c:765 end trace frame: 0xffff80002a3b0980, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83877ff0) 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(ffffffff8389d020) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) 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(ffffffff8389d020) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) at __mp_lock+0x192 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(ffffffff8389d020) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8389d020) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff8000ffff2a78,5b,10,ffff80002a3b0900) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000ffff2a78,5b,10,ffff80002a3b0900) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a3b0900) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a3b0900) at syscall+0x304 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78ba13704ec0, count: -15 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: 0x81e4eda7870, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x81e4eda7870, count: -1