uvm_fault(0xfffffd806c2777c0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff829fff08 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c41a690 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff829fff08 Starting stack trace... panic(ffffffff833e4931) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c41a5e0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000158e000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(41e5f,81,2000,ffff80003c446a90) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(41e5f,81,2000,ffff80003c446a90) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c41a790) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069b45bf0,81,fffffd80097fd4e0,ffff80003c446a90) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c3149a8,ffff80003c446a90) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c3149a8,ffff80003c446a90) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c3149a8,ffff80003c446a90) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c3149a8,ffff80003c446a90) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c446a90) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c446a90,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c446a90,ffff80003c41ab00,ffff80003c41aa50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41ab00) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41ab00) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fe60aa263e0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -804940424 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 112136 74129 0 0x10000002 0 0 syz-executor *222960 67945 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x79a2d0059560, 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(0xfffffd806c2777c0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79a2d0059560, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a346da0 rbx 0 rdx 0 rcx 0xffff8000ffffcf98 rax 0x3b r8 0xffff80002a346cd0 r9 0x1 r10 0xadfe06ebb552a304 r11 0xc34627af4132855b r12 0 r13 0 r14 0xffff8000ffffcf98 r15 0 rip 0xffffffff8325e3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a346d20 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=222960 pid=67945 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffd760,0xffff80002a2614e8 process=0xffff8000ffff5818 user=0xffff80002a341000, vmspace=0xfffffd800b0635b8 estcpu=36, cpticks=119, pctcpu=0.92, user=0, sys=119, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 35586 160261 6228 0 2 0 syz-executor 30321 22073 23192 0 2 0 syz-executor 30321 188908 23192 0 3 0x4000080 fsleep syz-executor 8322 254388 61654 0 2 0 syz-executor 8322 218020 61654 0 3 0x4000000 biowait syz-executor 8322 434157 61654 0 3 0x4000000 inode syz-executor 8322 425664 61654 0 3 0x4000000 inode syz-executor 85194 21440 67945 0 2 0 syz-executor 85194 229171 67945 0 3 0x4000080 fsleep syz-executor 85194 280253 67945 0 3 0x4000080 fsleep syz-executor 92170 111343 27084 0 2 0 syz-executor 92170 208205 27084 0 3 0x4000080 fsleep syz-executor 92170 377241 27084 0 3 0x4000080 fsleep syz-executor 13270 396839 73931 0 2 0 syz-executor 13270 216736 73931 0 3 0x4000080 fsleep syz-executor 13270 186013 73931 0 3 0x4000080 fsleep syz-executor 13270 305816 73931 0 3 0x4000080 fsleep syz-executor 13270 122779 73931 0 3 0x4000080 fsleep syz-executor 13270 84260 73931 0 3 0x4000080 fsleep syz-executor 13270 399850 73931 0 3 0x4000080 fsleep syz-executor 58962 298461 0 0 3 0x14280 nfsidl nfsio 74667 398330 0 0 3 0x14280 nfsidl nfsio 25281 4198 0 0 3 0x14280 nfsidl nfsio 53310 481237 0 0 3 0x14280 nfsidl nfsio 9188 376167 0 0 3 0x14280 nfsidl nfsio 51649 15566 0 0 3 0x14280 nfsidl nfsio 19302 505298 0 0 3 0x14280 nfsidl nfsio 34222 404029 0 0 3 0x14280 nfsidl nfsio 53624 103831 0 0 3 0x14280 nfsidl nfsio 87446 192125 0 0 3 0x14280 nfsidl nfsio 55008 280555 0 0 3 0x14280 nfsidl nfsio 95032 311134 0 0 3 0x14280 nfsidl nfsio 58103 68445 0 0 3 0x14280 nfsidl nfsio 94585 154262 0 0 3 0x14280 nfsidl nfsio 30851 44927 0 0 3 0x14280 nfsidl nfsio 76000 341170 0 0 3 0x14280 nfsidl nfsio 84393 5983 0 0 3 0x14280 nfsidl nfsio 95301 290403 0 0 3 0x14280 nfsidl nfsio 79031 368281 0 0 3 0x14280 nfsidl nfsio 9869 509952 0 0 3 0x14280 nfsidl nfsio 60178 501318 15539 0 3 0x82 nanoslp syz-executor 74129 112136 15539 0 7 0x10000002 syz-executor 73931 411703 15539 0 2 0x2 syz-executor 27084 51065 15539 0 3 0x82 nanoslp syz-executor *67945 222960 15539 0 7 0x2 syz-executor 61654 408327 15539 0 3 0x82 nanoslp syz-executor 6228 43116 15539 0 3 0x82 nanoslp syz-executor 23192 334506 15539 0 3 0x82 nanoslp syz-executor 15539 85952 23371 0 3 0x82 kqread syz-executor 23371 292802 54642 0 3 0x10008a sigsusp ksh 54642 392910 44557 0 3 0x98 kqread sshd-session 44557 242442 50759 0 3 0x92 kqread sshd-session 69255 411570 1 0 3 0x100083 ttyopn getty 50759 141323 1 0 3 0x88 kqread sshd 85343 457848 20524 74 3 0x1100092 bpf pflogd 20524 114008 1 0 3 0x80 sbwait pflogd 24435 209400 34280 73 3 0x1100090 kqread syslogd 34280 451483 1 0 3 0x100082 sbwait syslogd 64876 27062 1 0 3 0x100080 kqread resolvd 25004 325191 13557 77 3 0x100092 kqread dhcpleased 59458 480564 13557 77 3 0x100092 kqread dhcpleased 13557 396922 1 0 3 0x80 kqread dhcpleased 63985 265528 0 0 3 0x14200 bored smr 96581 327321 0 0 2 0x14200 zerothread 71335 354391 0 0 3 0x14200 aiodoned aiodoned 27558 304247 0 0 3 0x14200 syncer update 16823 204751 0 0 3 0x14200 cleaner cleaner 92645 206995 0 0 3 0x14200 reaper reaper 86036 190444 0 0 3 0x14200 pgdaemon pagedaemon 49509 368064 0 0 3 0x14200 bored viomb 68404 220856 0 0 3 0x40014200 acpi0 acpi0 53740 478694 0 0 3 0x40014200 idle1 21414 415076 0 0 3 0x14200 bored softnet1 90429 34069 0 0 3 0x14200 netlock softnet0 46142 306219 0 0 2 0x40014200 systqmp 73146 82300 0 0 3 0x14200 bored systq 85499 314161 0 0 3 0x14200 tmoslp softclockmp 73099 487523 0 0 3 0x40014200 tmoslp softclock 59086 309009 0 0 3 0x40014200 idle0 1 53209 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 8322 (syz-executor) thread 0xffff8000fffe8028 (218020) exclusive rrwlock inode r = 0 (0xfffffd806c1bd208) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 8322 (syz-executor) thread 0xffff8000fffe9cb0 (434157) exclusive rrwlock inode r = 0 (0xfffffd806c1bd330) #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+0xbd 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 dofchmodat+0x162 sys/kern/vfs_syscalls.c:2382 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11099 12202K 12504K 166960K 12957 0 pcb 19 12K 12K 166960K 99 0 rtable 223 9K 9K 166960K 425 0 pf 32 17K 81K 166960K 76 0 ifaddr 39 6K 7K 166960K 59 0 ifgroup 51 2K 2K 166960K 79 0 sysctl 4 1K 9K 166960K 11 0 counters 68 36K 38K 166960K 106 0 ioctlops 0 0K 4K 166960K 1579 0 iov 0 0K 20K 166960K 62 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1379 87K 87K 166960K 1822 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 573 0 sigio 0 0K 0K 166960K 43 0 proc 73 115K 164K 166960K 565 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 39 0 in_multi 88 6K 7K 166960K 117 0 ether_multi 1 0K 0K 166960K 4 0 mrt 1 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 484 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 252 151K 165K 166960K 7199 0 UVM aobj 11 6K 8K 166960K 14 0 pinsyscall 42 84K 102K 166960K 1697 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 40 0 NDP 11 0K 2K 166960K 38 0 temp 55 8670K 8924K 166960K 26673 0 kqueue 14 22K 30K 166960K 105 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 50 0 47 1 0 1 1 0 8 0 rtentry 176 129 0 35 6 0 6 6 0 8 0 unpcb 144 274 0 255 4 3 1 4 0 8 0 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 4 0 4 2 1 1 1 0 8 1 tcpcb 736 126 0 118 3 0 3 3 0 8 2 arp 136 22 0 4 1 0 1 1 0 8 0 inpcb 328 570 0 554 7 0 7 7 0 8 5 nd6 152 27 0 4 2 0 2 2 0 8 1 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 16 0 16 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 70 0 64 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 49 0 11 1 0 1 1 0 8 0 pfstkey 128 49 0 11 2 0 2 2 0 8 0 pfstate 448 49 0 11 6 0 6 6 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 rttmr 136 3 0 3 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 632 0 219 31 1 30 31 0 8 0 art_table 40 635 0 219 6 0 6 6 0 8 0 art_node 32 129 0 44 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 12 0 2 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2376 0 866 95 0 95 95 0 8 0 ffsino 296 2376 0 866 117 0 117 117 0 8 0 nchpl 144 3143 0 1441 64 0 64 64 0 8 0 rtmask 32 4 0 4 2 1 1 1 0 8 1 vnodes 216 2756 0 0 154 0 154 154 0 8 0 namei 1024 10204 0 10202 3 2 1 2 0 8 0 percpumem 16 68 0 19 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 5 0 3 1 0 1 1 0 8 0 kstatmem 264 44 0 20 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 15244 0 15243 9 6 3 8 1 8 2 plimitpl 152 277 0 257 1 0 1 1 0 8 0 sigapl 424 902 0 834 8 0 8 8 0 8 0 knotepl 120 753 0 0 23 0 23 23 0 8 0 kqueuepl 224 186 0 176 3 2 1 3 0 8 0 pipepl 344 180 0 152 6 1 5 6 0 8 2 fdescpl 528 865 0 834 3 0 3 3 0 8 0 filepl 160 4509 0 4283 14 1 13 14 0 8 2 lockfpl 104 140 0 138 1 0 1 1 0 8 0 lockfspl 48 62 0 60 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 65 0 48 1 0 1 1 0 8 0 ucredpl 104 612 0 598 1 0 1 1 0 8 0 zombiepl 144 836 0 834 1 0 1 1 0 8 0 processpl 1232 902 0 834 6 0 6 6 0 8 0 procpl 664 1686 0 1604 8 0 8 8 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 947 0 909 12 1 11 11 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 46 0 0 2 0 2 2 0 8 0 mbufpl 256 252 0 0 16 0 16 16 0 8 0 bufpl 280 5905 0 140 412 0 412 412 0 8 0 anonpl 32 6976 0 0 58 1 57 58 0 246 0 amapchunkpl 152 23013 0 22501 34 0 34 34 0 158 12 amappl16 200 3074 0 2889 14 3 11 11 0 8 1 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 6 0 6 2 2 0 1 0 8 0 amappl13 176 428 0 427 1 0 1 1 0 8 0 amappl12 168 1223 0 1181 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 49 0 34 1 0 1 1 0 8 0 amappl9 144 293 0 293 1 1 0 1 0 8 0 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 80 0 79 1 0 1 1 0 8 0 amappl6 120 275 0 262 1 0 1 1 0 8 0 amappl5 112 92 0 80 1 0 1 1 0 8 0 amappl4 104 411 0 383 1 0 1 1 0 8 0 amappl3 96 4335 0 4223 5 1 4 4 0 8 0 amappl2 88 533 0 470 2 0 2 2 0 8 0 amappl1 80 10763 0 10162 15 2 13 15 0 8 0 amappl 88 6416 0 6241 5 0 5 5 0 92 0 uvmvnodes 80 113 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 65 0 65 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 1 0 1 1 0 1 1 0 8 1 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 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 13 0 3 1 0 1 1 0 8 0 uaddrrnd 24 865 0 834 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 865 0 834 1 0 1 1 0 8 0 vmmpekpl 168 8711 0 8665 3 0 3 3 0 8 0 vmmpepl 168 61121 0 59018 97 2 95 96 0 357 1 vmsppl 488 864 0 834 5 1 4 5 0 8 0 rwobjpl 80 19139 0 17906 27 1 26 26 0 8 0 pdppl 4096 1747 0 1676 100 27 73 85 0 8 2 pvpl 32 15149 0 0 123 0 123 123 0 265 0 pmappl 256 869 0 837 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 293 0 34 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83850ff0) 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+0x25 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 sys/dev/kcov.c:153 __mp_lock(ffffffff839e3380) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839e3380) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x199 sys/kern/kern_lock.c:173 intr_handler(ffff80002a39ffc0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839e3380) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80002a3a0190) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a3a0190) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e7e9a1833c0, count: 1 ddb{0}> trace x86_ipi_db(ffffffff83850ff0) 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+0x25 kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x25 sys/dev/kcov.c:153 __mp_lock(ffffffff839e3380) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff839e3380) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x199 sys/kern/kern_lock.c:173 intr_handler(ffff80002a39ffc0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff839e3380) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839e3380) at __mp_lock+0x192 sys/kern/kern_lock.c:173 syscall(ffff80002a3a0190) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80002a3a0190) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e7e9a1833c0, count: -14 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x79a2d0059560, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79a2d0059560, count: -1