uvm_fault(0xfffffd800b0f3010, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81eae448 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a318cf0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81eae448 Starting stack trace... panic(ffffffff833a0b15) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a318c40) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001651000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80003980a558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003980a558) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a318df0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80651ec958,81,fffffd80097fb6e8,ffff80003980a558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806cd04c98,ffff80003980a558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806cd04c98,ffff80003980a558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806cd04c98,ffff80003980a558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806cd04c98,ffff80003980a558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003980a558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003980a558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003980a558,ffff80002a319160,ffff80002a3190b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a319160) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a319160) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e041f1d1bf0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 11 -1 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 126520 64621 0 0 0 0 syz-executor *262208 13907 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x766476b354b0, 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(0xfffffd800b0f3010, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x766476b354b0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3f5630 rbx 0 rdx 0 rcx 0xffff8000ffff2d08 rax 0x33 r8 0xffff80002a3f5560 r9 0xffff80002a3f5228 r10 0xc3bb53d195e0ad7f r11 0x423c59c860f560e7 r12 0 r13 0 r14 0xffff8000ffff2d08 r15 0 rip 0xffffffff813503ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3f55b0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=262208 pid=13907 tcnt=1 stat=onproc flags process=2 proc=0 runpri=83, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff3238,0xffff80003980ad30 process=0xffff80002a2a5350 user=0xffff80002a3f0000, vmspace=0xfffffd806ef6d3d8 estcpu=33, cpticks=158, pctcpu=0.41, user=8, sys=147, intr=3 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18488 459676 1854 0 2 0 syz-executor 64621 126520 91393 0 7 0 syz-executor 64621 3888 91393 0 2 0x4000000 syz-executor 42269 508259 36013 0 3 0x80 nanoslp syz-executor 42269 177566 36013 0 3 0x4000080 sbwait syz-executor 42269 35129 36013 0 3 0x4000080 fsleep syz-executor 42269 392855 36013 0 3 0x4000080 fsleep syz-executor 18504 128499 13907 0 3 0x80 nanoslp syz-executor 18504 495560 13907 0 3 0x4000080 ttyin syz-executor 18504 47025 13907 0 3 0x4000080 fsleep syz-executor 18504 472288 13907 0 3 0x4000080 fsleep syz-executor 79476 251611 0 0 3 0x14200 acct acct 61443 299950 64242 0 2 0x3 syz-executor 22855 334944 64242 0 3 0x82 wait syz-executor 1854 123910 64242 0 3 0x82 nanoslp syz-executor 36598 365692 0 0 3 0x14200 bored sosplice *13907 262208 64242 0 7 0x2 syz-executor 80480 487830 64242 0 3 0x2 biowait syz-executor 91393 466505 64242 0 3 0x82 nanoslp syz-executor 80224 97914 64242 0 2 0x2 syz-executor 36013 248172 64242 0 2 0x3 syz-executor 64242 14123 73299 0 3 0x82 kqread syz-executor 73299 31530 15547 0 3 0x10008a sigsusp ksh 15547 208280 89791 0 3 0x98 kqread sshd-session 89791 318638 9466 0 3 0x92 kqread sshd-session 15257 12428 1 0 3 0x100083 ttyopn getty 9466 349926 1 0 3 0x88 kqread sshd 39118 416835 75743 74 3 0x1100092 bpf pflogd 75743 75574 1 0 3 0x80 sbwait pflogd 8032 295179 92152 73 3 0x1100090 kqread syslogd 92152 228710 1 0 3 0x100082 sbwait syslogd 96594 223288 1 0 3 0x100080 kqread resolvd 37560 207123 53423 77 3 0x100092 kqread dhcpleased 25565 135259 53423 77 3 0x100092 kqread dhcpleased 53423 279302 1 0 3 0x80 kqread dhcpleased 88297 143620 0 0 3 0x14200 bored smr 12166 454250 0 0 2 0x14200 zerothread 4551 292311 0 0 3 0x14200 aiodoned aiodoned 99547 242748 0 0 3 0x14200 syncer update 71682 123878 0 0 3 0x14200 cleaner cleaner 36119 187121 0 0 3 0x14200 reaper reaper 35474 164953 0 0 3 0x14200 pgdaemon pagedaemon 7115 83799 0 0 3 0x14200 bored viomb 28907 98556 0 0 3 0x40014200 acpi0 acpi0 31812 401812 0 0 3 0x40014200 idle1 19800 85294 0 0 3 0x14200 bored softnet7 35854 503259 0 0 3 0x14200 bored softnet6 42648 318728 0 0 3 0x14200 bored softnet5 20566 393437 0 0 3 0x14200 bored softnet4 78403 390018 0 0 3 0x14200 bored softnet3 95266 469108 0 0 3 0x14200 bored softnet2 89870 332944 0 0 3 0x14200 bored softnet1 66802 5916 0 0 3 0x14200 netlock softnet0 68591 359021 0 0 3 0x14200 smrbar systqmp 11233 146226 0 0 3 0x14200 bored systq 35898 310220 0 0 3 0x14200 tmoslp softclockmp 49304 69874 0 0 3 0x40014200 tmoslp softclock 34252 161909 0 0 3 0x40014200 idle0 1 465068 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 80480 (syz-executor) thread 0xffff8000ffff3238 (487830) exclusive rrwlock inode r = 0 (0xfffffd806fd2eeb8) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bdc88f0) #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 Process 80224 (syz-executor) thread 0xffff80002a2b9a08 (97914) exclusive rwlock vmmaplk r = 0 (0xfffffd800b027e58) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvmspace_fork+0x44 sys/uvm/uvm_map.c:3729 #4 process_new+0x577 sys/kern/kern_fork.c:281 #5 fork1+0x3f6 sys/kern/kern_fork.c:-1 #6 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #7 Xsyscall+0x128 Process 68591 (systqmp) thread 0xffff8000ffffe7c8 (359021) shared rwlock systqmp r = 0 (0xffffffff8384ea68) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10273 11098K 11739K 166960K 12962 0 pcb 18 20K 22K 166960K 781 0 rtable 200 13K 14K 166960K 657 0 pf 47 20K 67487K 166960K 424 0 ifaddr 36 6K 7K 166960K 181 0 ifgroup 67 2K 3K 166960K 338 0 sysctl 4 1K 9K 166960K 34 0 counters 74 37K 38K 166960K 514 0 ioctlops 0 0K 4K 166960K 2181 0 iov 0 0K 28K 166960K 240 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1425 90K 90K 166960K 3113 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 5K 13K 166960K 48 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 164 0 dirhash 12 2K 3K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 2627 0 sigio 0 0K 0K 166960K 49 0 proc 73 115K 164K 166960K 875 0 subproc 72 4K 4K 166960K 112 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 484 0 in_multi 63 4K 7K 166960K 246 0 ether_multi 1 0K 0K 166960K 15 0 mrt 1 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 887 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 71 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 230 177K 196K 166960K 25702 0 UVM aobj 166 5K 5K 166960K 173 0 pinsyscall 42 84K 102K 166960K 3786 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 151 0 NDP 15 0K 1K 166960K 137 0 temp 79 8652K 8748K 166960K 144054 0 kqueue 13 20K 35K 166960K 526 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 120 397 0 394 4 3 1 3 0 8 0 rtentry 176 184 0 118 5 0 5 5 0 8 0 unpcb 144 2025 0 2006 15 9 6 6 0 8 5 syncache 336 9 0 9 3 3 0 1 0 8 0 tcpqe 32 2 0 2 2 2 0 1 0 8 0 tcpcb 736 864 0 859 15 13 2 10 0 8 1 arp 136 23 0 13 1 0 1 1 0 8 0 inpcb 328 3400 0 3391 26 19 7 10 0 8 5 nd6 144 30 0 17 1 0 1 1 0 8 0 pkpcb 40 32 0 32 3 2 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 3 0 3 2 1 1 1 0 8 1 ppxss 1192 190 0 190 3 2 1 2 0 8 1 pppxif 1504 10 0 10 5 4 1 2 0 8 1 pfstscr 40 6 0 5 1 0 1 1 0 8 0 pffrag 232 41 0 26 1 0 1 1 0 482 0 pffrnode 88 19 0 6 1 0 1 1 0 8 0 pffrent 40 73 0 58 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 pfrktable 1344 2 0 2 2 1 1 1 0 8 1 pfanchor 1288 3 0 0 1 0 1 1 0 8 0 pftag 88 5 0 1 1 0 1 1 0 8 0 pfstitem 24 196 0 70 1 0 1 1 0 8 0 pfstkey 128 270 0 143 5 0 5 5 0 8 0 pfstate 384 226 0 105 13 0 13 13 0 8 0 pfrule 1344 39 0 33 2 1 1 2 0 8 0 rttmr 136 8 0 8 4 3 1 1 0 8 1 art_heap8 4096 5 0 1 4 0 4 4 0 8 0 art_heap4 256 899 0 590 35 13 22 30 0 8 0 art_table 40 904 0 591 5 1 4 5 0 8 0 art_node 32 184 0 127 1 0 1 1 0 8 0 sysvmsgpl 40 48 0 8 1 0 1 1 0 8 0 semapl 112 159 0 149 1 0 1 1 0 8 0 shmpl 112 170 0 7 5 0 5 5 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 6370 0 4842 96 0 96 96 0 8 0 ffsino 296 6370 0 4842 119 0 119 119 0 8 1 nchpl 144 9938 0 8230 64 0 64 64 0 8 0 rtmask 32 19 0 19 3 2 1 1 0 8 1 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 35129 0 35128 2 1 1 1 0 8 0 percpumem 16 272 0 220 1 0 1 1 0 8 0 kstatmem 264 234 0 196 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 10 0 10 4 3 1 1 0 8 1 scxspl 216 67410 0 67409 11 10 1 8 1 8 0 plimitpl 152 939 0 921 1 0 1 1 0 8 0 sigapl 424 2882 0 2827 7 0 7 7 0 8 0 knotepl 120 575 0 0 18 0 18 18 0 8 0 kqueuepl 224 1094 0 1085 10 9 1 5 0 8 0 pipepl 344 508 0 480 14 8 6 9 0 8 3 fdescpl 528 2852 0 2821 3 0 3 3 0 8 0 filepl 160 20172 0 19945 30 11 19 21 0 8 8 lockfpl 104 1028 0 1026 2 0 2 2 0 8 1 lockfspl 48 349 0 347 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 77 0 60 1 0 1 1 0 8 0 ucredpl 104 3213 0 3199 2 0 2 2 0 8 1 zombiepl 144 3680 0 3678 1 0 1 1 0 8 0 processpl 1232 2882 0 2827 5 0 5 5 0 8 0 procpl 664 7183 0 7121 7 0 7 7 0 8 0 sosppl 168 24 0 24 3 2 1 1 0 8 1 sockpl 752 5957 0 5926 51 39 12 18 0 8 8 mcl64k 65536 31 0 0 4 0 4 4 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 45 0 0 6 0 6 6 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1185 0 0 74 0 74 74 0 8 0 bufpl 280 26568 0 20425 441 1 440 440 0 8 0 anonpl 32 12208 0 0 100 1 99 99 0 246 0 amapchunkpl 152 88415 0 87971 43 13 30 32 0 158 6 amappl16 200 11279 0 11244 68 45 23 26 0 8 13 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 131 0 119 1 0 1 1 0 8 0 amappl13 176 9 0 9 3 3 0 1 0 8 0 amappl12 168 3558 0 3529 4 2 2 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 31 0 30 1 0 1 1 0 8 0 amappl9 144 266 0 266 1 1 0 1 0 8 0 amappl8 136 31 0 28 1 0 1 1 0 8 0 amappl7 128 127 0 115 1 0 1 1 0 8 0 amappl6 120 224 0 220 1 0 1 1 0 8 0 amappl5 112 139 0 128 1 0 1 1 0 8 0 amappl4 104 327 0 306 1 0 1 1 0 8 0 amappl3 96 15600 0 15512 4 0 4 4 0 8 0 amappl2 88 3144 0 3064 2 0 2 2 0 8 0 amappl1 80 19899 0 19302 15 0 15 15 0 8 0 amappl 88 24487 0 24334 5 0 5 5 0 92 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 6 0 6 1 1 0 1 0 8 0 dma128 128 255 0 255 3 3 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 72 172 0 7 4 0 4 4 0 8 0 uaddrrnd 24 2851 0 2821 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2851 0 2821 1 0 1 1 0 8 0 vmmpekpl 168 23604 0 23554 3 0 3 3 0 8 0 vmmpepl 168 185438 0 183481 128 18 110 113 0 357 7 vmsppl 488 2851 0 2821 6 1 5 5 0 8 0 rwobjpl 80 55636 0 48617 154 1 153 153 0 8 1 pdppl 4096 5712 0 5642 114 42 72 86 0 8 2 pvpl 32 21124 0 0 170 0 170 170 0 265 0 pmappl 256 2851 0 2821 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 382 0 76 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837baff0) 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 __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(ffffffff839c7a60) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c7a60) at __mp_lock+0x1a3 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(ffffffff839c7a60) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c7a60) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a381970,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x765f00500ab0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff837baff0) 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 __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(ffffffff839c7a60) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c7a60) at __mp_lock+0x1a3 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(ffffffff839c7a60) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839c7a60) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a381970,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x765f00500ab0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x766476b354b0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x766476b354b0, count: -1