uvm_fault(0xfffffd806de347c8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8195d5b8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002afde270 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8195d5b8 Starting stack trace... panic(ffffffff833d7671) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002afde1c0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001480000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,2,2000,ffff80003a415cb8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,2,2000,ffff80003a415cb8) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002afde370) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd807b17e568,2,fffffd80097fd5b0,ffff80003a415cb8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806caad218,ffff80003a415cb8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806caad218,ffff80003a415cb8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806caad218,ffff80003a415cb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806caad218,ffff80003a415cb8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003a415cb8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003a415cb8,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003a415cb8,ffff80002afde6e0,ffff80002afde630) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002afde6e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002afde6e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74f72c2fcdd0, count: 242 End of stack trace. WARNING : SPL NOT LOWERED ON SYSCALL 91 -1615049864 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 171105 83500 0 0x2 0x1 0 syz-executor *413859 24900 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x73cd9fbc4b60, 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(0xfffffd806de347c8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x73cd9fbc4b60, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3ba1f0 rbx 0 rdx 0 rcx 0xffff80002a2722a8 rax 0x3c r8 0xffff80002a3ba120 r9 0x1 r10 0x4f05a59c62b37435 r11 0x1e6e81ba1517769f r12 0 r13 0 r14 0xffff80002a2722a8 r15 0 rip 0xffffffff81e993ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3ba170 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=413859 pid=24900 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003bc1b4f8,0xffff80003bc1ad40 process=0xffff8000fffeb518 user=0xffff80002a3b5000, vmspace=0xfffffd806f916b78 estcpu=33, cpticks=22, pctcpu=0.0, user=1, sys=21, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74986 382151 12911 0 3 0 vmmaplk syz-executor 74986 41908 12911 0 2 0x4000000 syz-executor 74986 159386 12911 0 2 0x4000000 syz-executor 974 270268 83500 0 2 0 syz-executor 974 310502 83500 0 2 0x4000000 syz-executor 91018 493032 14373 0 2 0 syz-executor 91018 264963 14373 0 3 0x4000080 fsleep syz-executor 65204 6078 3258 0 2 0 syz-executor 65204 271477 3258 0 2 0x4000000 syz-executor 93534 187350 1 0 2 0x100083 getty 12911 461156 41603 0 2 0xc82 syz-executor 83500 171105 41603 0 7 0x3 syz-executor 14373 75642 41603 0 2 0x3 syz-executor *24900 413859 41603 0 7 0x2 syz-executor 3258 412539 41603 0 2 0xc82 syz-executor 9247 63142 41603 0 3 0x82 piperd syz-executor 21759 82775 41603 0 3 0x82 wait syz-executor 83558 32387 0 0 3 0x14200 acct acct 58486 15069 41603 0 3 0x82 wait syz-executor 41603 240476 17775 0 2 0x3 syz-executor 17775 74586 96455 0 3 0x10008a sigsusp ksh 96455 207306 15384 0 3 0x98 kqread sshd-session 15384 130386 24406 0 3 0x92 kqread sshd-session 24406 394316 1 0 3 0x88 kqread sshd 75416 225732 37133 74 3 0x1100092 bpf pflogd 37133 102144 1 0 3 0x80 sbwait pflogd 53070 377407 33867 73 3 0x1100090 kqread syslogd 33867 182702 1 0 3 0x100082 sbwait syslogd 67082 400483 1 0 3 0x100080 kqread resolvd 84186 441562 43147 77 3 0x100092 kqread dhcpleased 82438 417467 43147 77 3 0x100092 kqread dhcpleased 43147 190104 1 0 3 0x80 kqread dhcpleased 25771 248759 0 0 2 0x14200 smr 48805 115986 0 0 3 0x14200 pgzero zerothread 37968 14919 0 0 3 0x14200 aiodoned aiodoned 49028 176323 0 0 3 0x14200 syncer update 38449 273532 0 0 3 0x14200 cleaner cleaner 87484 123153 0 0 3 0x14200 reaper reaper 74717 366043 0 0 3 0x14200 pgdaemon pagedaemon 12600 480818 0 0 3 0x14200 bored viomb 76726 196829 0 0 3 0x40014200 acpi0 acpi0 57075 482043 0 0 3 0x40014200 idle1 12025 172756 0 0 3 0x14200 bored softnet1 56747 523214 0 0 2 0x14200 softnet0 39344 1944 0 0 2 0x14200 systqmp 5738 161310 0 0 3 0x14200 bored systq 68109 329805 0 0 2 0x14200 softclockmp 81587 108360 0 0 3 0x40014200 tmoslp softclock 45719 125665 0 0 3 0x40014200 idle0 1 119385 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 74986 (syz-executor) thread 0xffff80003a414d28 (41908) exclusive rwlock vmmaplk r = 0 (0xfffffd806de34128) #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 Process 65204 (syz-executor) thread 0xffff80003bc1afc8 (271477) exclusive rrwlock inode r = 0 (0xfffffd8078221358) #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:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd8078221b70) #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:686 #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+0x16bd sys/ufs/ufs/ufs_lookup.c:573 #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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #14 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10267 11283K 12073K 166960K 27644 0 pcb 17 20K 36K 166960K 1446 0 rtable 292 15K 17K 166960K 1764 0 pf 42 19K 24K 166960K 638 0 ifaddr 32 6K 10K 166960K 334 0 ifgroup 60 2K 3K 166960K 583 0 sysctl 4 1K 9K 166960K 111 0 counters 70 37K 38K 166960K 700 0 ioctlops 0 0K 4K 166960K 2804 0 iov 0 0K 28K 166960K 441 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1615 102K 102K 166960K 9266 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 109 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 180 0 dirhash 12 2K 3K 166960K 114 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 244K 166960K 7939 0 sigio 0 0K 0K 166960K 231 0 proc 72 115K 164K 166960K 1576 0 subproc 72 4K 4K 166960K 252 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 733 0 in_multi 49 3K 7K 166960K 492 0 ether_multi 1 0K 0K 166960K 70 0 mrt 1 0K 0K 166960K 45 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 1621 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 13 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 248 159K 196K 166960K 70178 0 UVM aobj 136 18K 21K 166960K 153 0 pinsyscall 42 84K 106K 166960K 9595 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 425 0 NDP 13 0K 2K 166960K 253 0 temp 91 8680K 8806K 166960K 264567 0 kqueue 14 22K 31K 166960K 1276 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 1030 0 1027 13 12 1 5 0 8 0 rtentry 176 517 0 402 9 1 8 8 0 8 0 unpcb 144 2966 0 2947 20 19 1 6 0 8 0 syncache 336 8 0 8 6 6 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 2032 0 2028 60 58 2 13 0 8 1 arp 136 116 0 52 3 0 3 3 0 8 0 inpcb 328 6502 0 6495 102 98 4 12 0 8 3 nd6 152 115 0 101 2 0 2 2 0 8 0 pkpcb 40 140 0 140 14 13 1 1 0 8 1 kcovpl 48 28 0 20 1 0 1 1 0 8 0 mppekey 1024 3 0 3 3 3 0 1 0 8 0 ppxss 1192 255 0 255 11 10 1 1 0 8 1 pppxif 1504 16 0 16 11 10 1 1 0 8 1 pfstscr 40 3 0 1 1 0 1 1 0 8 0 pffrag 232 42 0 38 1 0 1 1 0 482 0 pffrnode 88 40 0 36 1 0 1 1 0 8 0 pffrent 40 164 0 160 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 9 0 9 6 6 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 67 0 54 1 0 1 1 0 8 0 pfstkey 128 67 0 53 2 0 2 2 0 8 0 pfstate 448 61 0 53 4 2 2 4 0 8 0 pfrule 1344 130 0 124 2 1 1 2 0 8 0 rttmr 136 6 0 6 6 5 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1937 0 1686 44 21 23 30 0 8 0 art_table 40 1941 0 1686 5 0 5 5 0 8 0 art_node 32 513 0 454 1 0 1 1 0 8 0 sysvmsgpl 40 88 0 77 1 0 1 1 0 8 0 semapl 112 177 0 167 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 85 0 68 3 0 3 3 0 8 0 dino2pl 256 14381 0 12813 99 0 99 99 0 8 0 ffsino 296 14381 0 12813 122 0 122 122 0 8 0 nchpl 144 24213 0 23611 65 39 26 65 0 8 0 rtmask 32 54 0 54 18 17 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 81701 0 81700 8 7 1 2 0 8 0 percpumem 16 365 0 315 1 0 1 1 0 8 0 vcpupl 3968 6 0 1 1 0 1 1 0 8 0 vmpool 840 8 0 3 1 0 1 1 0 8 0 kstatmem 264 396 0 366 7 4 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 127 0 127 15 15 0 1 0 8 0 scxspl 216 120760 0 120760 26 25 1 8 1 8 1 plimitpl 152 1402 0 1385 1 0 1 1 0 8 0 sigapl 424 8221 0 8173 8 2 6 8 0 8 0 knotepl 120 833 0 0 18 1 17 17 0 8 0 kqueuepl 224 2507 0 2497 28 27 1 5 0 8 0 pipepl 344 913 0 886 19 16 3 9 0 8 0 fdescpl 528 8160 0 8129 3 0 3 3 0 8 0 filepl 160 46446 0 46228 65 52 13 20 0 8 0 lockfpl 104 2444 0 2442 3 2 1 2 0 8 0 lockfspl 48 989 0 987 1 0 1 1 0 8 0 sessionpl 144 48 0 39 1 0 1 1 0 8 0 pgrppl 48 216 0 199 1 0 1 1 0 8 0 ucredpl 104 7502 0 7488 1 0 1 1 0 8 0 zombiepl 144 10198 0 10195 2 1 1 1 0 8 0 processpl 1232 8221 0 8173 6 1 5 6 0 8 0 procpl 664 18976 0 18923 9 3 6 8 0 8 0 sosppl 176 33 0 33 15 15 0 1 0 8 0 sockpl 752 10982 0 10953 164 154 10 23 0 8 6 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 11 0 0 2 0 2 2 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 16 0 0 2 0 2 2 0 8 0 mcl4k 4096 131 0 0 16 0 16 16 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 66 0 0 6 0 6 6 0 8 0 mtagpl 96 575 0 0 13 0 13 13 0 8 0 mbufpl 256 2328 61 0 130 0 130 130 0 8 0 bufpl 280 41778 0 35641 439 0 439 439 0 8 0 anonpl 32 14196 0 0 113 0 113 113 0 246 0 amapchunkpl 152 248598 0 248083 111 81 30 39 0 158 8 amappl16 200 20237 0 20201 182 172 10 27 0 8 0 amappl15 192 50 0 50 1 1 0 1 0 8 0 amappl14 184 6 0 6 2 2 0 1 0 8 0 amappl13 176 698 0 697 1 0 1 1 0 8 0 amappl12 168 8662 0 8619 3 0 3 3 0 8 0 amappl11 160 7 0 7 2 2 0 1 0 8 0 amappl10 152 48 0 34 1 0 1 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 41 0 38 1 0 1 1 0 8 0 amappl7 128 189 0 188 1 0 1 1 0 8 0 amappl6 120 529 0 515 1 0 1 1 0 8 0 amappl5 112 84 0 73 1 0 1 1 0 8 0 amappl4 104 577 0 544 1 0 1 1 0 8 0 amappl3 96 44573 0 44478 4 1 3 3 0 8 0 amappl2 88 8232 0 8155 2 0 2 2 0 8 0 amappl1 80 43005 0 42406 15 1 14 15 0 8 0 amappl 88 68252 0 68081 5 0 5 5 0 92 0 uvmvnodes 80 241 0 0 5 0 5 5 0 8 0 dma65536 65536 5 0 5 3 3 0 1 0 8 0 dma32768 32768 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 2 0 2 2 2 0 1 0 8 0 dma256 256 13 0 13 8 8 0 1 0 8 0 dma128 128 258 0 258 6 6 0 1 0 8 0 dma64 64 13 0 13 6 6 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 24 0 23 1 0 1 1 0 8 0 aobjpl 72 152 0 17 3 0 3 3 0 8 0 uaddrrnd 24 8160 0 8129 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8160 0 8129 1 0 1 1 0 8 0 vmmpekpl 168 51876 0 51821 4 0 4 4 0 8 0 vmmpepl 168 492251 0 490298 202 104 98 108 0 357 1 vmsppl 488 8159 0 8129 6 1 5 5 0 8 0 rwobjpl 80 110735 0 109414 53 18 35 37 0 8 0 pdppl 4096 16343 0 16269 177 101 76 87 0 8 2 pvpl 32 22449 0 0 179 0 179 179 0 265 0 pmappl 256 8167 0 8132 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 586 0 213 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8384cff0) 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(ffffffff8398a710) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398a710) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002afe4700,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff8398a710) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398a710) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff80003a415258,b,20,ffff80002afe49b0) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003a415258,b,20,ffff80002afe49b0) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002afe49b0) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002afe49b0) at syscall+0x304 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x705284d92b00, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8384cff0) 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(ffffffff8398a710) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398a710) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002afe4700,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff8398a710) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8398a710) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff80003a415258,b,20,ffff80002afe49b0) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003a415258,b,20,ffff80002afe49b0) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002afe49b0) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002afe49b0) at syscall+0x304 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x705284d92b00, count: -10 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x73cd9fbc4b60, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x73cd9fbc4b60, count: -1