uvm_fault(0xfffffd806c15e018, 0x48, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82615949 cs 8 rflags 10246 cr2 48 cpl 0 rsp ffff80003c41a3d0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82615949 Starting stack trace... panic(ffffffff8333cefc) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c41a320) at kerntrap+0x2cb sys/arch/amd64/amd64/trap.c:482 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b witness_checkorder(28,9,0) at witness_checkorder+0xa9 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x4a sys/kern/kern_lock.c:260 clockintr_unbind(ffff80000148e730,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000149a000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:576 dtclose(11e5f,81,2000,ffff8000fffdb750) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000fffdb750) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c41a620) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e4d3a50,81,fffffd80097fb5b0,ffff8000fffdb750) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80611f32d0,ffff8000fffdb750) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80611f32d0,ffff8000fffdb750) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80611f32d0,ffff8000fffdb750) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd80611f32d0,ffff8000fffdb750) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000fffdb750) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000fffdb750,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff8000fffdb750,ffff80003c41a990,ffff80003c41a8e0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c41a990) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c41a990) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:742 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x787b96002770, count: 239 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 74 0 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 110381 80876 0 0 0 0 syz-executor *265137 80876 0 0 0x4000000 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xfcaf328db40, 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(0xfffffd806c15e018, 0x48, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xfcaf328db40, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c4c85c0 rbx 0 rdx 0xffff800001486400 rcx 0xffff8000fffe1748 rax 0x32 r8 0xffff80003c4c84f0 r9 0x1 r10 0xf09df4fdc464ce97 r11 0x353e9ce75cb21ee7 r12 0 r13 0 r14 0xffff8000fffe1748 r15 0 rip 0xffffffff8191f3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c4c8540 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=265137 pid=80876 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffe14b8,0xffff8000fffe02d8 process=0xffff8000fffdc9d8 user=0xffff80003c4c3000, vmspace=0xfffffd806c15ed38 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85197 468520 82252 0 2 0x100001 ksh 13344 405974 55500 0 2 0 syz-executor 80876 110381 71494 0 7 0 syz-executor *80876 265137 71494 0 7 0x4000000 syz-executor 67121 374169 16665 60928 3 0x90 nanoslp syz-executor 67121 448496 16665 60928 3 0x4000090 ttyout syz-executor 67121 384199 16665 60928 3 0x4000090 fsleep syz-executor 53840 126511 15541 0 3 0x80 nanoslp syz-executor 53840 398358 15541 0 3 0x4000080 msgwait syz-executor 53840 453533 15541 0 3 0x4000080 fsleep syz-executor 53840 277820 15541 0 3 0x4000080 fsleep syz-executor 98839 414837 64697 0 3 0x80 nanoslp syz-executor 98839 190954 64697 0 3 0x4000080 sbwait syz-executor 98839 217331 64697 0 3 0x4000080 fsleep syz-executor 82252 65552 39482 0 3 0x10008b sigsusp ksh 57399 235860 94184 0 3 0x3000 suspend syz-executor 57399 366982 94184 0 3 0x4081000 biowait syz-executor 39482 25086 1 0 3 0x10008b sigsusp sh 50899 37835 37983 0 4 0x82000 syz-executor 50899 176112 37983 0 3 0x4082000 biowait syz-executor 50899 352046 37983 0 3 0x4002000 suspend syz-executor 95833 408496 0 0 3 0x14200 bored sosplice 65070 419889 0 0 3 0x14280 nfsidl nfsio 87954 129124 0 0 3 0x14280 nfsidl nfsio 92049 304456 0 0 3 0x14280 nfsidl nfsio 75640 465440 0 0 3 0x14280 nfsidl nfsio 98416 381646 0 0 3 0x14280 nfsidl nfsio 30100 523264 0 0 3 0x14280 nfsidl nfsio 59497 471580 0 0 3 0x14280 nfsidl nfsio 87704 326926 0 0 3 0x14280 nfsidl nfsio 66567 34504 0 0 3 0x14280 nfsidl nfsio 60952 462579 0 0 3 0x14280 nfsidl nfsio 98522 470120 0 0 3 0x14280 nfsidl nfsio 48388 405494 0 0 3 0x14280 nfsidl nfsio 96579 15002 0 0 3 0x14280 nfsidl nfsio 41735 161875 0 0 3 0x14280 nfsidl nfsio 42943 466075 0 0 3 0x14280 nfsidl nfsio 20178 498148 0 0 3 0x14280 nfsidl nfsio 37617 349260 0 0 3 0x14280 nfsidl nfsio 75892 23141 0 0 3 0x14280 nfsidl nfsio 39013 211702 0 0 3 0x14280 nfsidl nfsio 62222 461848 0 0 3 0x14280 nfsidl nfsio 16665 102867 56578 0 3 0x82 nanoslp syz-executor 71494 328099 56578 0 3 0x82 nanoslp syz-executor 55500 296148 56578 0 3 0x82 nanoslp syz-executor 3454 394044 56578 0 3 0x82 nanoslp syz-executor 64697 285825 56578 0 3 0x82 nanoslp syz-executor 15541 56917 56578 0 3 0x82 nanoslp syz-executor 37983 234460 56578 0 3 0x82 wait syz-executor 94184 427150 56578 0 3 0x82 nanoslp syz-executor 56578 225935 25319 0 3 0x82 kqread syz-executor 25319 278393 10976 0 3 0x10008a sigsusp ksh 10976 456028 79340 0 3 0x98 kqread sshd-session 79340 496456 70555 0 3 0x92 kqread sshd-session 70555 400979 1 0 3 0x88 kqread sshd 97124 413547 88273 74 3 0x1100092 bpf pflogd 88273 91220 1 0 3 0x80 sbwait pflogd 15968 173583 12541 73 3 0x1100090 kqread syslogd 12541 194653 1 0 3 0x100082 sbwait syslogd 43746 365334 1 0 3 0x100080 kqread resolvd 33150 181237 65094 77 3 0x100092 kqread dhcpleased 59792 63459 65094 77 3 0x100092 kqread dhcpleased 65094 391159 1 0 3 0x80 kqread dhcpleased 39754 349790 0 0 3 0x14200 bored smr 73502 415994 0 0 3 0x14200 pgzero zerothread 12973 145267 0 0 3 0x14200 aiodoned aiodoned 58064 9352 0 0 3 0x14200 syncer update 91366 84124 0 0 3 0x14200 cleaner cleaner 47381 92915 0 0 3 0x14200 reaper reaper 82663 466773 0 0 3 0x14200 pgdaemon pagedaemon 21352 314024 0 0 3 0x14200 bored viomb 1723 336536 0 0 3 0x40014200 acpi0 acpi0 77517 91116 0 0 3 0x40014200 idle1 18857 388615 0 0 3 0x14200 bored softnet3 2511 328198 0 0 3 0x14200 bored softnet2 75662 393788 0 0 3 0x14200 bored softnet1 599 293529 0 0 3 0x14200 netlock softnet0 4910 338487 0 0 2 0x40014200 systqmp 96242 215004 0 0 3 0x14200 bored systq 67939 382840 0 0 3 0x14200 tmoslp softclockmp 9487 61939 0 0 3 0x40014200 tmoslp softclock 21070 426315 0 0 3 0x40014200 idle0 1 223400 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 57399 (syz-executor) thread 0xffff8000ffff1c50 (366982) exclusive rrwlock inode r = 0 (0xfffffd806be952e0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 Process 50899 (syz-executor) thread 0xffff8000fffeb218 (176112) exclusive rrwlock inode r = 0 (0xfffffd806be95640) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x190 sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:742 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10215 11100K 11301K 166960K 11502 0 pcb 19 12K 12K 166960K 48 0 rtable 198 7K 8K 166960K 373 0 pf 33 17K 20K 166960K 53 0 ifaddr 35 6K 7K 166960K 45 0 ifgroup 47 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 7 0 counters 64 36K 36K 166960K 68 0 ioctlops 0 0K 4K 166960K 1528 0 iov 0 0K 1K 166960K 5 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1341 84K 85K 166960K 1494 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 304 0 proc 63 79K 128K 166960K 545 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 3 0K 0K 166960K 17 0 in_multi 78 5K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 408 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 251 174K 176K 166960K 4550 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 44 88K 103K 166960K 1461 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 4 0K 0K 166960K 15 0 NDP 10 0K 2K 166960K 28 0 temp 43 8684K 8755K 166960K 4923 0 kqueue 14 22K 28K 166960K 48 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 45 1 0 1 1 0 8 0 rtentry 176 112 0 24 6 0 6 6 0 8 1 unpcb 144 106 0 84 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 48 0 43 1 0 1 1 0 8 0 arp 128 18 0 4 1 0 1 1 0 8 0 inpcb 328 181 0 167 2 0 2 2 0 8 0 nd6 144 25 0 7 1 0 1 1 0 8 0 pkpcb 40 68 0 67 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 6 0 5 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 4 0 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 24 0 1 1 0 1 1 0 8 0 pfstkey 128 28 0 5 1 0 1 1 0 8 0 pfstate 384 26 0 3 3 0 3 3 0 8 0 pfrule 1344 28 0 19 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 454 0 90 29 0 29 29 0 8 2 art_table 32 455 0 90 4 0 4 4 0 8 0 art_node 16 111 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 7 1 0 1 1 0 8 0 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1822 0 315 95 0 95 95 0 8 0 ffsino 288 1822 0 315 109 0 109 109 0 8 0 nchpl 144 2235 0 537 63 0 63 63 0 8 0 uvmvnodes 80 2008 0 0 41 0 41 41 0 8 0 vnodes 216 2008 0 0 112 0 112 112 0 8 0 namei 1024 7093 0 7093 1 0 1 1 0 8 1 percpumem 16 49 0 2 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0 kstatmem 264 26 0 4 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 10446 0 10444 5 1 4 4 1 8 3 plimitpl 152 49 0 29 1 0 1 1 0 8 0 sigapl 424 645 0 571 10 1 9 9 0 8 0 knotepl 120 302 0 0 10 0 10 10 0 8 0 kqueuepl 224 63 0 52 1 0 1 1 0 8 0 pipepl 336 120 0 93 3 0 3 3 0 8 0 fdescpl 520 606 0 572 3 0 3 3 0 8 0 filepl 160 2457 0 2212 11 0 11 11 0 8 0 lockfpl 104 95 0 93 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 23 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 13 1 0 1 1 0 8 0 ucredpl 104 243 0 229 1 0 1 1 0 8 0 zombiepl 144 574 0 571 1 0 1 1 0 8 0 processpl 1240 645 0 571 6 0 6 6 0 8 0 procpl 656 890 0 805 9 1 8 8 0 8 0 srpgc 96 4 0 4 1 0 1 1 0 8 1 sockpl 728 407 0 365 5 0 5 5 0 8 1 mcl64k 65536 14 0 0 2 0 2 2 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 9 0 0 2 0 2 2 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 326 0 0 21 0 21 21 0 8 0 bufpl 280 4310 0 122 300 0 300 300 0 8 0 anonpl 32 9818 0 0 80 0 80 80 0 246 0 amapchunkpl 152 13654 0 13038 26 0 26 26 0 158 0 amappl16 200 2496 0 2129 21 1 20 20 0 8 0 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 120 0 109 1 0 1 1 0 8 0 amappl13 176 1 0 1 1 1 0 1 0 8 0 amappl12 168 1292 0 1258 4 1 3 3 0 8 1 amappl11 160 54 0 39 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 245 0 245 2 1 1 1 0 8 1 amappl8 136 83 0 81 1 0 1 1 0 8 0 amappl7 128 113 0 102 1 0 1 1 0 8 0 amappl6 120 186 0 180 1 0 1 1 0 8 0 amappl5 112 125 0 116 1 0 1 1 0 8 0 amappl4 104 331 0 312 1 0 1 1 0 8 0 amappl3 96 2385 0 2271 5 1 4 4 0 8 0 amappl2 88 671 0 606 2 0 2 2 0 8 0 amappl1 80 9143 0 8548 14 0 14 14 0 8 1 amappl 88 3809 0 3631 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 dma256 256 9 0 9 2 1 1 1 0 8 1 dma128 128 254 0 254 2 1 1 1 0 8 1 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 606 0 572 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 606 0 572 1 0 1 1 0 8 0 vmmpekpl 168 6487 0 6449 2 0 2 2 0 8 0 vmmpepl 168 44496 0 42116 107 1 106 106 0 357 0 vmsppl 480 605 0 572 5 0 5 5 0 8 0 rwobjpl 72 16944 0 13666 61 0 61 61 0 8 0 pdppl 4096 1219 0 1144 105 28 77 85 0 8 2 pvpl 32 17950 0 0 145 0 145 145 0 265 0 pmappl 256 605 0 572 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 400 0 30 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838b6ff0) 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(ffffffff838e14e0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e14e0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838e14e0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e14e0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c49e1f0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7cfd40bc89f0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff838b6ff0) 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(ffffffff838e14e0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e14e0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838e14e0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838e14e0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165 intr_handler(ffff80003c49e1f0,ffff800000079a80) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7cfd40bc89f0, 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: 0xfcaf328db40, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xfcaf328db40, count: -1