uvm_fault(0xfffffd806ef971f0, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8261d638 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a383840 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8261d638 Starting stack trace... panic(ffffffff8339d4d1) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a383790) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000016b5000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(21e5f,81,2000,ffff80002a2e42d8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80002a2e42d8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a383940) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e4326d0,81,fffffd80097fb340,ffff80002a2e42d8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805bc43930,ffff80002a2e42d8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805bc43930,ffff80002a2e42d8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805bc43930,ffff80002a2e42d8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805bc43930,ffff80002a2e42d8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2e42d8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2e42d8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2e42d8,ffff80002a383cb0,ffff80002a383c00) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a383cb0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a383cb0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7214d6272d10, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND * 98313 19170 0 0 0 1 syz-executor 342063 88676 0 0x14000 0x200 0 systqmp proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780b98c59090, 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}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd806ef971f0, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780b98c59090, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c54b120 rbx 0 rdx 0 rcx 0xffff8000328087e8 rax 0x2a r8 0xffff80003c54b050 r9 0x1 r10 0xb83d47cd985c6151 r11 0x8dedc3628ffb48c0 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff829a84c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c54b0a0 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=98313 pid=19170 tcnt=6 stat=onproc flags process=0 proc=0 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a35f270,0xffff800032808030 process=0xffff800037025d00 user=0xffff80003c546000, vmspace=0xfffffd806ef973d8 estcpu=34, cpticks=18, pctcpu=0.7, user=16, sys=1, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 5337 491392 83931 0 3 0x80 nanoslp syz-executor 5337 420431 83931 0 3 0x4000080 kqread syz-executor 5337 216098 83931 0 3 0x4000080 fsleep syz-executor 93565 50805 53317 0 2 0 syz-executor 93565 325454 53317 0 3 0x4000080 rest syz-executor 8212 391660 56565 0 3 0x80 nanoslp syz-executor 8212 68815 56565 0 3 0x4000080 ttyout syz-executor 8212 413264 56565 0 3 0x4000080 fsleep syz-executor 57675 140238 60521 0 3 0x80 nanoslp syz-executor 57675 70610 60521 0 3 0x4000080 pipewr syz-executor 57675 361852 60521 0 3 0x4000080 fsleep syz-executor *19170 98313 62259 0 7 0 syz-executor 19170 420231 62259 0 3 0x4000080 fsleep syz-executor 19170 332587 62259 0 3 0x4000080 fsleep syz-executor 19170 188122 62259 0 3 0x4000080 fsleep syz-executor 19170 45613 62259 0 3 0x4000080 fsleep syz-executor 19170 240054 62259 0 3 0x4000080 fsleep syz-executor 13316 184992 92048 0 3 0x3000 suspend syz-executor 13316 129694 92048 0 3 0x4081000 biowait syz-executor 53317 389160 97378 0 3 0x82 nanoslp syz-executor 60676 353076 0 0 3 0x14280 nfsidl nfsio 31000 112950 0 0 3 0x14280 nfsidl nfsio 58619 481239 0 0 3 0x14280 nfsidl nfsio 90540 133547 0 0 3 0x14280 nfsidl nfsio 92703 226376 0 0 3 0x14280 nfsidl nfsio 24429 3075 0 0 3 0x14280 nfsidl nfsio 70051 36513 0 0 3 0x14280 nfsidl nfsio 87073 126331 0 0 3 0x14280 nfsidl nfsio 28949 271591 0 0 3 0x14280 nfsidl nfsio 9737 274422 0 0 3 0x14280 nfsidl nfsio 30089 258538 0 0 3 0x14280 nfsidl nfsio 56830 366545 0 0 3 0x14280 nfsidl nfsio 58743 151280 0 0 3 0x14280 nfsidl nfsio 89123 136698 0 0 3 0x14280 nfsidl nfsio 25031 200961 0 0 3 0x14280 nfsidl nfsio 78100 152101 0 0 3 0x14280 nfsidl nfsio 8175 159153 0 0 3 0x14280 nfsidl nfsio 68370 193194 0 0 3 0x14280 nfsidl nfsio 91902 448964 0 0 3 0x14280 nfsidl nfsio 78654 58931 0 0 3 0x14280 nfsidl nfsio 83931 231489 97378 0 3 0x82 nanoslp syz-executor 56565 289776 97378 0 3 0x82 nanoslp syz-executor 28599 309443 97378 0 3 0x82 nanoslp syz-executor 4966 403647 1 0 3 0x100083 ttyin getty 60521 380407 97378 0 3 0x82 nanoslp syz-executor 54984 221101 0 0 3 0x14200 bored sosplice 12579 403778 97378 0 3 0x82 nanoslp syz-executor 92048 21430 97378 0 3 0x82 wait syz-executor 62259 373912 97378 0 3 0x82 nanoslp syz-executor 97378 280404 20113 0 3 0x82 kqread syz-executor 20113 115120 31995 0 3 0x10008a sigsusp ksh 31995 321268 52403 0 3 0x98 kqread sshd-session 52403 340212 47285 0 3 0x92 kqread sshd-session 47285 254988 1 0 3 0x88 kqread sshd 49387 497820 3638 74 3 0x1100092 bpf pflogd 3638 386237 1 0 3 0x80 sbwait pflogd 82418 131658 93139 73 3 0x1100090 kqread syslogd 93139 121357 1 0 3 0x100082 sbwait syslogd 96370 354619 1 0 3 0x100080 kqread resolvd 74427 438159 0 0 3 0x14200 bored smr 74457 229592 0 0 3 0x14200 pgzero zerothread 61939 304252 0 0 3 0x14200 aiodoned aiodoned 49222 431706 0 0 3 0x14200 syncer update 63645 301076 0 0 3 0x14200 cleaner cleaner 18336 425623 0 0 2 0x14200 reaper 13080 337314 0 0 3 0x14200 pgdaemon pagedaemon 26220 504615 0 0 3 0x14200 bored viomb 35477 355217 0 0 3 0x40014200 acpi0 acpi0 59592 314666 0 0 3 0x40014200 idle1 35306 300865 0 0 3 0x14200 bored softnet7 58324 324446 0 0 3 0x14200 bored softnet6 65274 504716 0 0 3 0x14200 bored softnet5 98155 194336 0 0 3 0x14200 bored softnet4 98832 320316 0 0 3 0x14200 bored softnet3 25475 64257 0 0 3 0x14200 bored softnet2 39958 109391 0 0 3 0x14200 bored softnet1 78387 306770 0 0 3 0x14200 bored softnet0 88676 342063 0 0 7 0x14200 systqmp 19604 142000 0 0 3 0x14200 bored systq 566 250973 0 0 3 0x14200 tmoslp softclockmp 46513 179834 0 0 3 0x40014200 tmoslp softclock 7542 477796 0 0 3 0x40014200 idle0 1 505486 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839bec00) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #4 pmap_do_remove+0x89f sys/arch/amd64/amd64/pmap.c:1939 #5 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1863 #6 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #6 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2486 #7 exit1+0x6fc sys/kern/kern_exit.c:260 #8 sys_exit+0x1a sys/kern/kern_exit.c:-1 #9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #10 Xsyscall+0x128 Process 13316 (syz-executor) thread 0xffff80002a35f270 (129694) Process 18336 (reaper) thread 0xffff8000ffffc2a0 (425623) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10269 11089K 12349K 166960K 14174 0 pcb 18 16K 18K 166960K 1234 0 rtable 259 17K 17K 166960K 1219 0 pf 45 19K 131089K 166960K 444 0 ifaddr 48 9K 10K 166960K 285 0 ifgroup 72 3K 3K 166960K 513 0 sysctl 4 1K 9K 166960K 51 0 counters 76 37K 38K 166960K 878 0 ioctlops 0 0K 5K 166960K 2868 0 iov 0 0K 32K 166960K 425 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1482 93K 93K 166960K 4865 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 26 57K 57K 166960K 336 0 dirhash 12 2K 3K 166960K 99 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 4931 0 sigio 0 0K 0K 166960K 96 0 proc 68 83K 163K 166960K 1492 0 subproc 72 4K 4K 166960K 172 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 763 0 in_multi 86 6K 7K 166960K 397 0 ether_multi 1 0K 0K 166960K 65 0 mrt 4 0K 0K 166960K 29 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 1276 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 251 150K 185K 166960K 46174 0 UVM aobj 7 2K 2K 166960K 7 0 pinsyscall 36 72K 101K 166960K 6255 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 436 0 NDP 16 0K 2K 166960K 213 0 temp 86 8652K 9676K 166960K 227197 0 kqueue 9 15K 36K 166960K 1014 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 120 583 0 582 5 4 1 3 0 8 0 rtentry 176 333 0 243 5 0 5 5 0 8 0 unpcb 144 4010 0 4000 25 24 1 6 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 1571 0 1567 28 27 1 7 0 8 0 arp 128 55 0 38 1 0 1 1 0 8 0 inpcb 328 5561 0 5553 45 38 7 8 0 8 6 nd6 144 60 0 43 1 0 1 1 0 8 0 pkpcb 40 83 0 83 8 7 1 1 0 8 1 kcovpl 48 19 0 11 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 1 1 1 0 8 1 ppxss 1192 356 0 356 6 5 1 1 0 8 1 pppxif 1504 17 0 17 8 7 1 1 0 8 1 pffrag 232 29 0 20 1 0 1 1 0 482 0 pffrnode 88 23 0 15 1 0 1 1 0 8 0 pffrent 40 63 0 54 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 6 0 6 4 3 1 1 0 8 1 pfanchor 1288 3 0 3 1 1 0 1 0 8 0 pfstitem 24 359 0 193 2 0 2 2 0 8 0 pfstkey 128 363 0 197 7 0 7 7 0 8 0 pfstate 384 360 0 195 19 0 19 19 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 rttmr 136 3 0 3 3 3 0 1 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1335 0 905 44 17 27 30 0 8 0 art_table 40 1340 0 905 5 0 5 5 0 8 0 art_node 32 331 0 257 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 19 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 323 0 299 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 76 0 59 3 0 3 3 0 8 0 dino2pl 256 10890 0 9354 97 0 97 97 0 8 0 ffsino 296 10890 0 9354 119 0 119 119 0 8 0 nchpl 144 17971 0 17334 64 40 24 64 0 8 0 rtmask 32 37 0 37 9 8 1 1 0 8 1 uvmvnodes 80 5927 0 0 121 0 121 121 0 8 0 vnodes 216 5927 0 0 330 0 330 330 0 8 0 namei 1024 63322 0 63322 5 4 1 2 0 8 1 percpumem 16 454 0 401 1 0 1 1 0 8 0 kstatmem 264 356 0 316 5 2 3 4 0 8 0 acpiwqpl 32 3 0 3 1 0 1 1 1 8 1 scsiplug 72 26 0 26 7 7 0 1 0 8 0 scxspl 216 108128 0 108127 18 16 2 8 1 8 1 plimitpl 152 1130 0 1109 1 0 1 1 0 8 0 sigapl 424 5217 0 5145 10 1 9 9 0 8 0 knotepl 120 863 0 0 24 0 24 24 0 8 0 kqueuepl 224 2028 0 2021 23 22 1 9 0 8 0 pipepl 344 754 0 722 15 11 4 9 0 8 0 fdescpl 528 5140 0 5112 3 0 3 3 0 8 0 filepl 160 36929 0 36707 44 31 13 18 0 8 1 lockfpl 104 2047 0 2046 3 2 1 2 0 8 0 lockfspl 48 690 0 689 1 0 1 1 0 8 0 sessionpl 144 36 0 28 1 0 1 1 0 8 0 pgrppl 48 376 0 360 1 0 1 1 0 8 0 ucredpl 104 6594 0 6583 1 0 1 1 0 8 0 zombiepl 144 6542 0 6539 2 1 1 1 0 8 0 processpl 1232 5217 0 5145 6 0 6 6 0 8 0 procpl 664 13365 0 13277 10 1 9 9 0 8 0 sosppl 168 27 0 27 8 8 0 1 0 8 0 sockpl 752 10435 0 10416 88 79 9 17 0 8 6 mcl64k 65536 26 0 0 4 0 4 4 0 8 0 mcl16k 16384 3 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 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 15 0 15 15 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 88 0 0 8 0 8 8 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1418 0 0 86 0 86 86 0 8 0 bufpl 280 43104 0 36961 440 0 440 440 0 8 0 anonpl 32 16078 0 0 129 0 129 129 0 246 0 amapchunkpl 152 162297 0 161643 84 49 35 36 0 158 8 amappl16 200 16360 0 16033 118 98 20 36 0 8 2 amappl15 192 23 0 23 3 2 1 1 0 8 1 amappl14 184 161 0 151 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 5958 0 5930 3 1 2 2 0 8 0 amappl11 160 53 0 45 1 0 1 1 0 8 0 amappl10 152 34 0 33 2 1 1 1 0 8 0 amappl9 144 251 0 250 2 1 1 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 137 0 128 1 0 1 1 0 8 0 amappl6 120 287 0 283 1 0 1 1 0 8 0 amappl5 112 169 0 162 1 0 1 1 0 8 0 amappl4 104 338 0 319 1 0 1 1 0 8 0 amappl3 96 33538 0 33419 5 1 4 4 0 8 0 amappl2 88 825 0 775 2 0 2 2 0 8 0 amappl1 80 28662 0 28154 14 2 12 14 0 8 0 amappl 88 44454 0 44265 5 0 5 5 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 1 1 1 0 8 1 dma128 128 262 0 262 7 7 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 6 0 0 1 0 1 1 0 8 0 uaddrrnd 24 5140 0 5112 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5140 0 5112 1 0 1 1 0 8 0 vmmpekpl 168 38664 0 38596 4 0 4 4 0 8 0 vmmpepl 168 322425 0 320370 156 50 106 110 0 357 9 vmsppl 488 5139 0 5111 7 3 4 5 0 8 0 rwobjpl 80 84363 0 77288 158 8 150 152 0 8 3 pdppl 4096 10287 0 10222 129 64 65 83 0 8 0 pvpl 32 26813 0 0 215 0 215 215 0 265 0 pmappl 256 5139 0 5111 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 440 0 120 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83845ff0) 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_const_cmp4(0,1) at __sanitizer_cov_trace_const_cmp4+0x2e kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_const_cmp4(0,1) at __sanitizer_cov_trace_const_cmp4+0x2e sys/dev/kcov.c:230 mtx_enter(ffffffff83856578) at mtx_enter+0x77 sys/kern/kern_lock.c:261 msleep_nsec(ffffffff83856560,ffffffff83856578,20,ffffffff833d3acd,ffffffffffffffff) at msleep_nsec+0x2d3 sys/kern/kern_synch.c:209 taskq_next_work(ffffffff83856560,ffff80002a21ac58) at taskq_next_work+0x8e sys/kern/kern_task.c:399 taskq_thread(ffffffff83856560) at taskq_thread+0x1d5 sys/kern/kern_task.c:439 end trace frame: 0x0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff83845ff0) 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_const_cmp4(0,1) at __sanitizer_cov_trace_const_cmp4+0x2e kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_const_cmp4(0,1) at __sanitizer_cov_trace_const_cmp4+0x2e sys/dev/kcov.c:230 mtx_enter(ffffffff83856578) at mtx_enter+0x77 sys/kern/kern_lock.c:261 msleep_nsec(ffffffff83856560,ffffffff83856578,20,ffffffff833d3acd,ffffffffffffffff) at msleep_nsec+0x2d3 sys/kern/kern_synch.c:209 taskq_next_work(ffffffff83856560,ffff80002a21ac58) at taskq_next_work+0x8e sys/kern/kern_task.c:399 taskq_thread(ffffffff83856560) at taskq_thread+0x1d5 sys/kern/kern_task.c:439 end trace frame: 0x0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780b98c59090, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x780b98c59090, count: -1