uvm_fault(0xfffffd8064b417d0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8190e738 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a2d88b0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8190e738 Starting stack trace... panic(ffffffff833a4fb8) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a2d8800) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800000afb000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(21e5f,81,2000,ffff80003a00b248) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003a00b248) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a2d89b0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80723eb2e8,81,fffffd80097fb340,ffff80003a00b248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805c5a34e0,ffff80003a00b248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805c5a34e0,ffff80003a00b248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805c5a34e0,ffff80003a00b248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805c5a34e0,ffff80003a00b248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003a00b248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003a00b248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003a00b248,ffff80002a2d8d20,ffff80002a2d8c70) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a2d8d20) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2d8d20) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79e399e8cd10, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 4 41 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 518758 40423 0 0 0 0 syz-executor *247925 27035 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7504bd8cd9a0, 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(0xfffffd8064b417d0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7504bd8cd9a0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a29ef00 rbx 0 rdx 0 rcx 0xffff8000ffffd4c8 rax 0x32 r8 0xffff80002a29ee30 r9 0x1 r10 0xc888ee3de934ffb7 r11 0xbdd5a6b42c86c240 r12 0 r13 0 r14 0xffff8000ffffd4c8 r15 0 rip 0xffffffff81a233ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a29ee80 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=247925 pid=27035 tcnt=1 stat=onproc flags process=2 proc=0 runpri=66, usrpri=66, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffdc90,0xffff8000ffffda08 process=0xffff8000ffff2690 user=0xffff80002a299000, vmspace=0xfffffd806e37c3e0 estcpu=16, cpticks=102, pctcpu=0.42, user=9, sys=89, intr=4 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40423 518758 55735 0 7 0 syz-executor 40423 483294 55735 0 3 0x4000080 fsleep syz-executor 40423 289085 55735 0 3 0x4000080 fsleep syz-executor 40423 164206 55735 0 2 0x4000000 syz-executor 25781 80331 19182 0 2 0 syz-executor 25781 288585 19182 0 3 0x4000080 ttyout syz-executor 25781 187596 19182 0 3 0x4000080 fsleep syz-executor 76278 489644 18490 0 2 0 syz-executor 76278 48344 18490 0 3 0x4000080 ttyretype syz-executor 76278 423843 18490 0 3 0x4000080 fsleep syz-executor 69425 481057 78484 0 4 0x82000 syz-executor 69425 428986 78484 0 3 0x4082000 biowait syz-executor 69425 174492 78484 0 3 0x4082000 fltagain2 syz-executor 69425 504224 78484 0 4 0x4082000 syz-executor 69425 21842 78484 0 3 0x4002000 suspend syz-executor 85266 297896 10776 0 4 0x82000 syz-executor 85266 252765 10776 0 4 0x4082000 syz-executor 85266 481249 10776 0 4 0x4082000 syz-executor 85266 313145 10776 0 3 0x4002000 suspend syz-executor 85266 421424 10776 0 4 0x4082000 syz-executor 73499 427512 0 0 3 0x14200 acct acct 40999 261605 27035 0 3 0x82 nanoslp syz-executor 10776 345194 27035 0 3 0x82 wait syz-executor 78484 9948 27035 0 3 0x82 nanoslp syz-executor 70027 390682 0 0 3 0x14200 bored sosplice 80196 150709 1 0 3 0x100083 ttyopn getty 19182 398830 27035 0 3 0x82 nanoslp syz-executor 70420 228966 27035 0 3 0x2 biowait syz-executor 901 67342 27035 0 3 0x82 nanoslp syz-executor 18490 281609 27035 0 3 0x82 nanoslp syz-executor 55735 288126 27035 0 3 0x82 nanoslp syz-executor *27035 247925 79301 0 7 0x2 syz-executor 79301 382242 282 0 3 0x10008a sigsusp ksh 282 49877 45882 0 3 0x98 kqread sshd-session 45882 223440 5407 0 3 0x92 kqread sshd-session 5407 386663 1 0 3 0x88 kqread sshd 44090 335663 18662 74 3 0x1100092 bpf pflogd 18662 468948 1 0 3 0x80 sbwait pflogd 44394 66731 85375 73 3 0x1100090 kqread syslogd 85375 455595 1 0 3 0x100082 sbwait syslogd 50178 147430 1 0 3 0x100080 kqread resolvd 34850 305342 40425 77 3 0x100092 kqread dhcpleased 6695 43800 40425 77 3 0x100092 kqread dhcpleased 40425 156195 1 0 3 0x80 kqread dhcpleased 58701 201261 0 0 3 0x14200 bored smr 40325 171878 0 0 3 0x14200 pgzero zerothread 69654 294352 0 0 3 0x14200 aiodoned aiodoned 78178 132566 0 0 3 0x14200 syncer update 24660 283889 0 0 3 0x14200 cleaner cleaner 8995 468589 0 0 3 0x14200 reaper reaper 59495 434391 0 0 3 0x14200 pgdaemon pagedaemon 39826 277542 0 0 3 0x14200 bored viomb 16628 165283 0 0 3 0x40014200 acpi0 acpi0 58251 377368 0 0 3 0x40014200 idle1 94079 200065 0 0 3 0x14200 bored softnet1 89121 349792 0 0 3 0x14200 netlock softnet0 44923 111701 0 0 2 0x40014200 systqmp 24044 270079 0 0 3 0x14200 bored systq 59765 89311 0 0 3 0x14200 tmoslp softclockmp 36232 224191 0 0 3 0x40014200 tmoslp softclock 99220 356165 0 0 3 0x40014200 idle0 1 235874 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 69425 (syz-executor) thread 0xffff8000fffefca0 (428986) exclusive rrwlock inode r = 0 (0xfffffd805d53b580) #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 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:746 #9 Xsyscall+0x128 Process 70420 (syz-executor) thread 0xffff8000fffeed10 (228966) exclusive rrwlock inode r = 0 (0xfffffd805af0e7d8) #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:693 #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:746 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd805af0ea28) #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:693 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #13 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10226 11101K 11429K 166960K 12632 0 pcb 18 14K 16K 166960K 171 0 rtable 155 9K 9K 166960K 463 0 pf 36 18K 67485K 166960K 155 0 ifaddr 35 5K 7K 166960K 114 0 ifgroup 56 2K 2K 166960K 172 0 sysctl 3 1K 9K 166960K 14 0 counters 68 36K 37K 166960K 202 0 ioctlops 0 0K 4K 166960K 1673 0 iov 0 0K 28K 166960K 101 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1467 92K 92K 166960K 2252 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 17 10K 10K 166960K 75 0 dirhash 12 2K 2K 166960K 42 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 106K 166960K 1076 0 sigio 0 0K 0K 166960K 9 0 proc 72 115K 179K 166960K 733 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 112 0 in_multi 61 4K 7K 166960K 194 0 ether_multi 1 0K 0K 166960K 13 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 546 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 265 176K 186K 166960K 11350 0 UVM aobj 112 5K 5K 166960K 112 0 pinsyscall 42 84K 102K 166960K 2244 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 61 0 NDP 12 0K 1K 166960K 81 0 temp 80 8656K 8788K 166960K 48438 0 kqueue 13 20K 30K 166960K 192 0 SYN cache 2 8K 16K 166960K 3 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 120 141 0 138 2 1 1 2 0 8 0 rtentry 176 148 0 92 5 0 5 5 0 8 0 unpcb 144 780 0 758 6 3 3 5 0 8 1 syncache 336 9 0 9 3 3 0 1 0 8 0 tcpqe 32 3 0 3 1 1 0 1 0 8 0 tcpcb 736 471 0 462 10 8 2 7 0 8 1 arp 136 17 0 9 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 1472 0 1455 16 12 4 12 0 8 2 nd6 152 26 0 17 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 57 0 57 1 0 1 1 0 8 1 pppxif 1504 2 0 2 2 2 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 2 2 1 1 1 0 482 0 pffrnode 88 5 0 2 2 1 1 1 0 8 0 pffrent 40 14 0 9 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 1 0 1 1 1 0 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pfstitem 24 82 0 24 1 0 1 1 0 8 0 pfstkey 128 84 0 26 2 0 2 2 0 8 0 pfstate 384 83 0 25 6 0 6 6 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 746 0 439 28 5 23 28 0 8 2 art_table 40 748 0 439 5 0 5 5 0 8 1 art_node 32 147 0 99 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 69 0 54 1 0 1 1 0 8 0 shmpl 112 109 0 0 4 0 4 4 0 8 0 dirhash 1024 37 0 20 3 0 3 3 0 8 0 dino2pl 256 3336 0 1817 96 0 96 96 0 8 0 ffsino 296 3336 0 1817 118 0 118 118 0 8 0 nchpl 144 4769 0 3063 64 0 64 64 0 8 0 rtmask 32 8 0 8 2 2 0 1 0 8 0 uvmvnodes 80 3973 0 0 82 0 82 82 0 8 0 vnodes 216 3973 0 0 221 0 221 221 0 8 0 namei 1024 16795 0 16795 3 2 1 2 0 8 1 percpumem 16 116 0 67 1 0 1 1 0 8 0 kstatmem 264 120 0 92 3 0 3 3 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 22852 0 22850 17 12 5 8 1 8 4 plimitpl 152 449 0 427 1 0 1 1 0 8 0 sigapl 424 1367 0 1318 7 1 6 7 0 8 0 knotepl 120 1010 0 0 31 0 31 31 0 8 0 kqueuepl 224 495 0 485 7 3 4 5 0 8 3 pipepl 344 206 0 175 4 0 4 4 0 8 1 fdescpl 528 1347 0 1316 3 0 3 3 0 8 0 filepl 160 8652 0 8401 22 8 14 16 0 8 3 lockfpl 104 645 0 642 3 2 1 2 0 8 0 lockfspl 48 232 0 229 1 0 1 1 0 8 0 sessionpl 144 29 0 20 1 0 1 1 0 8 0 pgrppl 48 48 0 31 1 0 1 1 0 8 0 ucredpl 104 941 0 927 1 0 1 1 0 8 0 zombiepl 144 1320 0 1318 1 0 1 1 0 8 0 processpl 1232 1367 0 1318 6 1 5 5 0 8 0 procpl 664 2903 0 2839 6 0 6 6 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 752 2429 0 2387 31 19 12 18 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 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 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 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 8 0 0 1 0 1 1 0 8 0 mbufpl 256 1155 0 0 72 0 72 72 0 8 0 bufpl 280 10241 0 4098 439 0 439 439 0 8 0 anonpl 32 16025 0 0 130 0 130 130 0 246 0 amapchunkpl 152 37689 0 37058 42 9 33 33 0 158 6 amappl16 200 5313 0 4894 54 23 31 37 0 8 8 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 123 0 111 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 2037 0 2006 4 2 2 3 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 66 0 66 1 1 0 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 121 0 107 1 0 1 1 0 8 0 amappl6 120 211 0 207 1 0 1 1 0 8 0 amappl5 112 149 0 139 1 0 1 1 0 8 0 amappl4 104 326 0 306 1 0 1 1 0 8 0 amappl3 96 6510 0 6399 4 1 3 3 0 8 0 amappl2 88 1608 0 1527 2 0 2 2 0 8 0 amappl1 80 12857 0 12256 16 2 14 15 0 8 0 amappl 88 10455 0 10267 6 1 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 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 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 128 253 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 72 111 0 0 3 0 3 3 0 8 0 uaddrrnd 24 1347 0 1316 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1347 0 1316 1 0 1 1 0 8 0 vmmpekpl 168 12084 0 12032 3 0 3 3 0 8 0 vmmpepl 168 90665 0 88234 127 7 120 120 0 357 3 vmsppl 488 1346 0 1316 7 2 5 5 0 8 0 rwobjpl 80 30380 0 24934 116 1 115 115 0 8 3 pdppl 4096 2702 0 2632 104 32 72 86 0 8 2 pvpl 32 22459 0 0 181 0 181 181 0 265 0 pmappl 256 1346 0 1316 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 354 0 55 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837efff0) 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(ffffffff83915db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x192 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80002a3162f0,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: 0x7939a3076950, count: 4 ddb{0}> trace x86_ipi_db(ffffffff837efff0) 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(ffffffff83915db8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x192 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83915db8) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80002a3162f0,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: 0x7939a3076950, 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: 0x7504bd8cd9a0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7504bd8cd9a0, count: -1