uvm_fault(0xfffffd806b9d8018, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81427858 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c4eb430 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81427858 Starting stack trace... panic(ffffffff833a078c) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4eb380) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001542000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(21e5f,81,2000,ffff80003c02dcc0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003c02dcc0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c4eb530) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b5b29a8,81,fffffd80097fb208,ffff80003c02dcc0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805db0b298,ffff80003c02dcc0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805db0b298,ffff80003c02dcc0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805db0b298,ffff80003c02dcc0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805db0b298,ffff80003c02dcc0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c02dcc0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c02dcc0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c02dcc0,ffff80003c4eb8a0,ffff80003c4eb7f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4eb8a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4eb8a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72cb0bbd6080, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 1163520376 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *255633 95411 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7d094559e960, 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(0xfffffd806b9d8018, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d094559e960, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a325290 rbx 0 rdx 0 rcx 0xffff80002a2b8018 rax 0x3b r8 0xffff80002a3251c0 r9 0xffff80002a324e88 r10 0x5c21a9acf17bf71d r11 0x234e8f950a3baa58 r12 0 r13 0 r14 0xffff80002a2b8018 r15 0 rip 0xffffffff830303ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a325210 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=255633 pid=95411 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b82b0,0xffff80002a2b9780 process=0xffff80002a2c09d8 user=0xffff80002a320000, vmspace=0xfffffd800b0f37b0 estcpu=36, cpticks=42, pctcpu=0.14, user=1, sys=39, intr=2 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20203 364914 79685 0 2 0 syz-executor 82968 514808 95411 0 2 0 syz-executor 82968 513324 95411 0 3 0x4000080 fsleep syz-executor 82452 517095 91921 0 4 0x82000 syz-executor 82452 43490 91921 0 2 0x4002000 syz-executor 82452 51397 91921 0 4 0x4082000 syz-executor 35191 442432 1 0 3 0x100083 ttyin getty 72321 122505 0 0 3 0x14200 bored sosplice 94001 123496 0 0 3 0x14280 nfsidl nfsio 45873 473190 0 0 3 0x14280 nfsidl nfsio 75827 361879 0 0 3 0x14280 nfsidl nfsio 25429 175918 0 0 3 0x14280 nfsidl nfsio 58323 359582 0 0 3 0x14280 nfsidl nfsio 97184 511046 0 0 3 0x14280 nfsidl nfsio 41281 51895 0 0 3 0x14280 nfsidl nfsio 78667 159374 0 0 3 0x14280 nfsidl nfsio 86242 452773 0 0 3 0x14280 nfsidl nfsio 12833 178499 0 0 3 0x14280 nfsidl nfsio 28385 453007 0 0 3 0x14280 nfsidl nfsio 17987 142503 0 0 3 0x14280 nfsidl nfsio 87351 150581 0 0 3 0x14280 nfsidl nfsio 2721 360706 0 0 3 0x14280 nfsidl nfsio 94037 238665 0 0 3 0x14280 nfsidl nfsio 23643 64990 0 0 3 0x14280 nfsidl nfsio 51312 284263 0 0 3 0x14280 nfsidl nfsio 88504 135216 0 0 3 0x14280 nfsidl nfsio 72143 330135 0 0 3 0x14280 nfsidl nfsio 46736 388284 0 0 3 0x14280 nfsidl nfsio 79685 88820 23936 0 2 0x3 syz-executor 95786 458404 23936 0 3 0x82 nanoslp syz-executor 91921 499713 23936 0 3 0x82 nanoslp syz-executor 45404 168810 23936 0 2 0x3 syz-executor 62306 279829 23936 0 3 0x2 biowait syz-executor 87280 504450 23936 0 3 0x82 nanoslp syz-executor 81572 498720 23936 0 3 0x82 nanoslp syz-executor *95411 255633 23936 0 7 0x2 syz-executor 23936 341569 79120 0 3 0x82 kqread syz-executor 79120 37208 33364 0 3 0x10008a sigsusp ksh 33364 199580 30219 0 3 0x98 kqread sshd-session 30219 261480 94868 0 3 0x92 kqread sshd-session 94868 195465 1 0 3 0x88 kqread sshd 11893 387966 14428 74 3 0x1100092 bpf pflogd 14428 150836 1 0 3 0x80 sbwait pflogd 25170 400034 87473 73 3 0x1100090 kqread syslogd 87473 429444 1 0 3 0x100082 sbwait syslogd 89927 342719 1 0 3 0x100080 kqread resolvd 22041 347141 48830 77 3 0x100092 kqread dhcpleased 81970 51936 48830 77 3 0x100092 kqread dhcpleased 48830 47069 1 0 3 0x80 kqread dhcpleased 73145 345768 0 0 3 0x14200 bored smr 20275 256110 0 0 2 0x14200 zerothread 26170 55649 0 0 3 0x14200 aiodoned aiodoned 8659 144665 0 0 3 0x14200 syncer update 36918 375683 0 0 3 0x14200 cleaner cleaner 144 158415 0 0 3 0x14200 reaper reaper 25274 164974 0 0 3 0x14200 pgdaemon pagedaemon 63952 301091 0 0 3 0x14200 bored viomb 19883 351909 0 0 3 0x40014200 acpi0 acpi0 55962 74872 0 0 3 0x40014200 idle1 90396 200124 0 0 3 0x14200 bored softnet7 91433 471103 0 0 3 0x14200 bored softnet6 54249 82482 0 0 3 0x14200 bored softnet5 74337 310968 0 0 3 0x14200 bored softnet4 97812 71834 0 0 3 0x14200 bored softnet3 89343 337978 0 0 3 0x14200 bored softnet2 57151 244228 0 0 3 0x14200 bored softnet1 98610 6487 0 0 3 0x14200 netlock softnet0 56114 114026 0 0 3 0x14200 smrbar systqmp 81445 691 0 0 3 0x14200 bored systq 50506 396496 0 0 3 0x14200 tmoslp softclockmp 52824 229131 0 0 3 0x40014200 tmoslp softclock 93564 262200 0 0 3 0x40014200 idle0 1 302215 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 62306 (syz-executor) thread 0xffff8000ffff3a00 (279829) exclusive rrwlock inode r = 0 (0xfffffd805eea6c78) #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:748 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cd8c7c0) #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:748 #9 Xsyscall+0x128 Process 56114 (systqmp) thread 0xffff8000ffffe7c8 (114026) shared rwlock systqmp r = 0 (0xffffffff837e7548) #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 10216 11054K 12325K 166960K 12106 0 pcb 18 13K 13K 166960K 147 0 rtable 211 8K 8K 166960K 428 0 pf 40 18K 82K 166960K 115 0 ifaddr 44 8K 8K 166960K 78 0 ifgroup 60 2K 2K 166960K 122 0 sysctl 4 1K 9K 166960K 13 0 counters 70 37K 37K 166960K 136 0 ioctlops 0 0K 4K 166960K 1656 0 iov 0 0K 16K 166960K 47 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1463 92K 92K 166960K 1952 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 29 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 89K 166960K 793 0 sigio 0 0K 0K 166960K 12 0 proc 73 115K 180K 166960K 625 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 102 0 in_multi 94 6K 7K 166960K 127 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 592 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 232 159K 174K 166960K 9152 0 UVM aobj 16 2K 2K 166960K 17 0 pinsyscall 41 82K 105K 166960K 1919 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 59 0 NDP 13 0K 2K 166960K 51 0 temp 63 8648K 8767K 166960K 46041 0 kqueue 15 24K 31K 166960K 167 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 82 0 79 1 0 1 1 0 8 0 rtentry 176 121 0 31 5 0 5 5 0 8 0 unpcb 144 636 0 615 7 6 1 4 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 358 0 353 11 4 7 7 0 8 6 arp 128 16 0 3 1 0 1 1 0 8 0 inpcb 328 987 0 880 18 3 15 15 0 8 4 nd6 144 20 0 2 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 2 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 28 0 27 2 1 1 1 0 8 0 pppxif 1504 3 0 3 2 2 0 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 5 0 2 1 0 1 1 0 482 0 pffrnode 88 5 0 2 1 0 1 1 0 8 0 pffrent 40 10 0 6 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 1 0 1 1 1 0 1 0 8 0 pfstitem 24 59 0 15 1 0 1 1 0 8 0 pfstkey 128 61 0 18 2 0 2 2 0 8 0 pfstate 384 58 0 16 5 0 5 5 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 544 0 112 29 2 27 29 0 8 0 art_table 40 547 0 112 5 0 5 5 0 8 0 art_node 32 121 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 10 1 0 1 1 0 8 0 semapl 112 25 0 15 1 0 1 1 0 8 0 shmpl 112 14 0 1 1 0 1 1 0 8 0 dirhash 1024 26 0 9 3 0 3 3 0 8 0 dino2pl 256 2848 0 1337 96 1 95 96 0 8 0 ffsino 296 2848 0 1337 118 1 117 118 0 8 0 nchpl 144 3952 0 2257 64 0 64 64 0 8 0 rtmask 32 5 0 5 3 3 0 1 0 8 0 uvmvnodes 80 3266 0 0 67 0 67 67 0 8 0 vnodes 216 3266 0 0 182 0 182 182 0 8 0 namei 1024 13154 0 13153 3 2 1 2 0 8 0 percpumem 16 83 0 33 1 0 1 1 0 8 0 kstatmem 264 72 0 44 3 1 2 3 0 8 0 scsiplug 72 4 0 4 3 3 0 1 0 8 0 scxspl 216 29367 0 29366 12 11 1 8 1 8 0 plimitpl 152 223 0 205 1 0 1 1 0 8 0 sigapl 424 1131 0 1057 9 0 9 9 0 8 0 knotepl 120 778 0 0 24 0 24 24 0 8 0 kqueuepl 224 249 0 237 2 1 1 2 0 8 0 pipepl 344 160 0 133 3 0 3 3 0 8 0 fdescpl 528 1087 0 1057 3 0 3 3 0 8 0 filepl 160 6231 0 5905 23 6 17 17 0 8 1 lockfpl 104 403 0 401 2 1 1 2 0 8 0 lockfspl 48 112 0 110 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 40 0 23 1 0 1 1 0 8 0 ucredpl 104 709 0 696 1 0 1 1 0 8 0 zombiepl 144 1061 0 1057 1 0 1 1 0 8 0 processpl 1248 1131 0 1057 6 0 6 6 0 8 0 procpl 664 2302 0 2225 8 0 8 8 0 8 0 sosppl 168 2 0 2 1 1 0 1 0 8 0 sockpl 752 1721 0 1590 25 5 20 20 0 8 6 mcl64k 65536 11 0 0 2 0 2 2 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 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 61 0 0 7 0 7 7 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1137 0 0 72 0 72 72 0 8 0 bufpl 280 14548 0 8405 439 0 439 439 0 8 0 anonpl 32 12882 0 0 104 0 104 104 0 246 0 amapchunkpl 152 29831 0 29369 38 14 24 30 0 158 3 amappl16 200 4554 0 4525 42 29 13 28 0 8 8 amappl15 192 10 0 10 3 3 0 1 0 8 0 amappl14 184 165 0 153 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1746 0 1717 3 1 2 2 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 257 0 257 1 1 0 1 0 8 0 amappl8 136 20 0 17 1 0 1 1 0 8 0 amappl7 128 113 0 100 1 0 1 1 0 8 0 amappl6 120 178 0 175 1 0 1 1 0 8 0 amappl5 112 139 0 129 1 0 1 1 0 8 0 amappl4 104 307 0 287 1 0 1 1 0 8 0 amappl3 96 5877 0 5771 5 1 4 4 0 8 0 amappl2 88 665 0 601 2 0 2 2 0 8 0 amappl1 80 11304 0 10709 15 2 13 15 0 8 0 amappl 88 8297 0 8138 5 0 5 5 0 92 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 7 0 7 2 2 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 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 16 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1087 0 1057 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1087 0 1057 1 0 1 1 0 8 0 vmmpekpl 168 10190 0 10151 2 0 2 2 0 8 0 vmmpepl 168 74635 0 72711 114 3 111 112 0 357 11 vmsppl 488 1086 0 1056 5 1 4 5 0 8 0 rwobjpl 80 25671 0 21462 93 0 93 93 0 8 0 pdppl 4096 2181 0 2112 99 28 71 83 0 8 2 pvpl 32 19223 0 0 156 0 156 156 0 265 0 pmappl 256 1086 0 1056 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 350 0 42 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83847ff0) 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(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) 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 __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff800036809340,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 exit1(ffff80002a2e5ca8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80002a2e5ca8,ffff8000368095c0,ffff800036809510) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000368095c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000368095c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 end trace frame: 0xffff800036809640, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83847ff0) 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(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) 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 __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff800036809340,ffff800000079a80) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8392ba78) at __mp_lock+0x192 sys/kern/kern_lock.c:165 exit1(ffff80002a2e5ca8,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80002a2e5ca8,ffff8000368095c0,ffff800036809510) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000368095c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000368095c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7cfb4c551010, count: -15 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7d094559e960, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d094559e960, count: -1