witness: lock order reversal: 1st 0xffff8000299dee30 &cq->cq_mtx (&cq->cq_mtx) 2nd 0xffffffff839a0d90 &sched_lock (&sched_lock) lock order [1] &cq->cq_mtx (&cq->cq_mtx) -> [2] &sched_lock (&sched_lock) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 sleep_setup+0xed sys/kern/kern_synch.c:304 #2 msleep_nsec+0x10b sys/kern/kern_synch.c:217 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 lock order [2] &sched_lock (&sched_lock) -> [1] &cq->cq_mtx (&cq->cq_mtx) #0 mtx_enter+0x95 sys/kern/kern_lock.c:406 #1 clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323 #2 mi_switch+0x187 sys/kern/sched_bsd.c:376 #3 ast+0x15a mi_ast sys/sys/syscall_mi.h:252 [inline] #3 ast+0x15a sys/arch/amd64/amd64/trap.c:739 #4 intr_user_exit+0x3c Stopped at db_enter+0x25: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff839a0d90,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839a0d80) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffff8000299dee80,220,ffffffff834333f5) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffff8000299dee80,ffff8000299dee20,220,ffffffff834333f5,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff80000159b000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,81,2000,ffff8000fffe7248) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffe7248) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003a3f8570) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c294d90,81,fffffd80097fd820,ffff8000fffe7248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ccc92a8,ffff8000fffe7248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ccc92a8,ffff8000fffe7248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ccc92a8,ffff8000fffe7248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ccc92a8,ffff8000fffe7248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe7248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe7248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe7248,ffff80003a3f88e0,ffff80003a3f8830) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003a3f88e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3f88e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x712d1bafa460, count: -17 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003a3f8240 rbx 0 rdx 0 rcx 0xffff8000fffe7248 rax 0xffffffff8381aff0 cpu_info_full_primary+0x1ff0 r8 0xffff80003a3f8120 r9 0x8080808080808080 r10 0x3e819507c72f3c42 r11 0xedc06918318d79e r12 0xfffffd8003f4ee40 r13 0xfffffd80046f9330 r14 0x3 r15 0xffffffff8341ef74 substchar+0x514d rip 0xffffffff81be7eb5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003a3f8230 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=245150 pid=91563 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffe7248 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffe6a80,0xffff8000fffe6560 process=0xffff8000fffe8018 user=0xffff80003a3f3000, vmspace=0xfffffd806c9699a0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 71912 479249 3251 60929 3 0x90 fsleep syz-executor 71912 494923 3251 60929 3 0x4000090 pipewr syz-executor 98884 387590 41256 0 3 0x80 fsleep syz-executor 98884 320172 41256 0 2 0x4000000 syz-executor 4466 62614 71844 0 3 0x80 fsleep syz-executor 4466 241315 71844 0 3 0x4000080 kqread syz-executor 92675 473456 3540 0 3 0x80 fsleep syz-executor 92675 250247 3540 0 3 0x4000080 fifow syz-executor 13285 73700 0 0 3 0x14200 acct acct 40394 494399 0 0 3 0x14280 nfsidl nfsio 77766 501640 75458 0 3 0x82 wait syz-executor 5009 326460 75458 0 3 0x82 wait syz-executor 3251 497236 75458 0 3 0x82 nanoslp syz-executor 3584 279994 75458 0 3 0x82 nanoslp syz-executor 3540 32747 75458 0 3 0x82 nanoslp syz-executor 15991 344260 75458 0 3 0x82 wait syz-executor 41256 224180 75458 0 3 0x82 nanoslp syz-executor 71844 49403 75458 0 3 0x82 nanoslp syz-executor 75458 134867 6763 0 3 0x82 kqread syz-executor 6763 70454 57157 0 3 0x10008a sigsusp ksh 57157 59251 21239 0 3 0x98 kqread sshd-session 21239 12351 65239 0 3 0x92 kqread sshd-session 3011 512796 1 0 3 0x100083 ttyopn getty 65239 394814 1 0 3 0x88 kqread sshd 10510 193620 22951 74 3 0x1100092 bpf pflogd 22951 335921 1 0 3 0x80 sbwait pflogd 77054 470112 91154 73 3 0x1100090 kqread syslogd 91154 143302 1 0 3 0x100082 sbwait syslogd 1654 361433 1 0 3 0x100080 kqread resolvd 31176 205628 62911 77 3 0x100092 kqread dhcpleased 17795 241352 62911 77 3 0x100092 kqread dhcpleased 62911 133 1 0 3 0x80 kqread dhcpleased 49833 518144 0 0 3 0x14200 bored smr 76262 175012 0 0 3 0x14200 pgzero zerothread 46750 514526 0 0 3 0x14200 aiodoned aiodoned 77943 303545 0 0 3 0x14200 syncer update 58531 74860 0 0 3 0x14200 cleaner cleaner 48755 375101 0 0 3 0x14200 reaper reaper 67257 231457 0 0 3 0x14200 pgdaemon pagedaemon 7911 362045 0 0 3 0x14200 bored viomb 95604 68195 0 0 3 0x40014200 acpi0 acpi0 95783 475134 0 0 7 0x40014200 idle1 30889 120659 0 0 3 0x14200 bored softnet1 18434 443317 0 0 3 0x14200 bored softnet0 68258 153475 0 0 3 0x14200 bored systqmp 32333 3015 0 0 3 0x14200 bored systq 45906 218706 0 0 3 0x14200 tmoslp softclockmp 44974 122735 0 0 3 0x40014200 tmoslp softclock 15731 234566 0 0 3 0x40014200 idle0 1 129636 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &cq->cq_mtx r = 0 (0xffff8000299dee30) #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+0x4b4 sys/kern/kern_lock.c:487 #2 clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 #3 dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 #4 dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] #4 dtclose+0x109 sys/dev/dt/dt_dev.c:239 #5 spec_close+0x466 sys/kern/spec_vnops.c:-1 #6 VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 #7 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] #7 vn_closefile+0x12b sys/kern/vfs_vnops.c:615 #8 fdrop+0x121 sys/kern/kern_descrip.c:1280 #9 closef+0x192 sys/kern/kern_descrip.c:1264 #10 fdfree+0x116 sys/kern/kern_descrip.c:1195 #11 exit1+0x576 sys/kern/kern_exit.c:215 #12 sys_exit+0x1a sys/kern/kern_exit.c:-1 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11114 12399K 12644K 166960K 14083 0 pcb 17 16K 18K 166960K 243 0 rtable 246 12K 13K 166960K 615 0 pf 32 17K 82K 166960K 138 0 ifaddr 38 7K 8K 166960K 106 0 ifgroup 50 2K 2K 166960K 172 0 sysctl 4 1K 9K 166960K 9 0 counters 66 36K 37K 166960K 204 0 ioctlops 0 0K 4K 166960K 1670 0 iov 0 0K 16K 166960K 105 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1497 94K 94K 166960K 2461 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 12 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 42 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1176 0 sigio 1 0K 0K 166960K 19 0 proc 75 131K 164K 166960K 632 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 121 0 in_multi 84 6K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 10 0 mrt 2 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 549 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 249 161K 179K 166960K 12188 0 UVM aobj 19 6K 8K 166960K 22 0 pinsyscall 43 86K 102K 166960K 2331 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 86 0 NDP 10 0K 2K 166960K 68 0 temp 77 8680K 8752K 166960K 49088 0 kqueue 13 20K 30K 166960K 204 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 91 0 88 1 0 1 1 0 8 0 rtentry 176 161 0 65 6 0 6 6 0 8 0 unpcb 144 714 0 693 7 2 5 6 0 8 4 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 328 0 320 11 7 4 7 0 8 3 arp 136 22 0 7 1 0 1 1 0 8 0 inpcb 328 1177 0 1166 15 5 10 10 0 8 8 nd6 152 44 0 11 2 0 2 2 0 8 0 pkpcb 40 107 0 107 2 2 0 1 0 8 0 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 53 0 53 2 1 1 1 0 8 1 pppxif 1504 8 0 8 2 1 1 1 0 8 1 pfstscr 40 1 0 0 1 0 1 1 0 8 0 pffrag 232 6 0 0 1 0 1 1 0 482 0 pffrnode 88 6 0 0 1 0 1 1 0 8 0 pffrent 40 11 0 5 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 pfstitem 24 83 0 26 1 0 1 1 0 8 0 pfstkey 128 83 0 26 3 0 3 3 0 8 0 pfstate 448 82 0 26 7 0 7 7 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 841 0 317 37 1 36 36 0 8 2 art_table 40 846 0 317 6 0 6 6 0 8 0 art_node 32 161 0 74 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 3 3 0 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 3446 0 1940 95 0 95 95 0 8 0 ffsino 296 3446 0 1940 117 0 117 117 0 8 0 nchpl 144 5163 0 4555 64 33 31 64 0 8 7 rtmask 32 16 0 16 2 1 1 1 0 8 1 vnodes 216 4265 0 0 237 0 237 237 0 8 0 namei 1024 17900 0 17900 1 0 1 1 0 8 1 percpumem 16 117 0 69 1 0 1 1 0 8 0 vcpupl 3968 3 0 1 1 0 1 1 0 8 0 vmpool 848 3 0 1 1 0 1 1 0 8 0 kstatmem 264 100 0 78 4 2 2 3 0 8 0 scsiplug 72 5 0 5 1 0 1 1 0 8 1 scxspl 216 32104 0 32104 11 8 3 8 1 8 3 plimitpl 152 243 0 226 1 0 1 1 0 8 0 sigapl 424 1486 0 1436 7 1 6 7 0 8 0 knotepl 120 577 0 0 17 0 17 17 0 8 0 kqueuepl 224 367 0 357 5 2 3 3 0 8 2 pipepl 344 172 0 144 3 0 3 3 0 8 0 fdescpl 528 1458 0 1426 3 0 3 3 0 8 0 filepl 160 9157 0 8929 25 8 17 18 0 8 4 lockfpl 104 414 0 412 2 1 1 2 0 8 0 lockfspl 48 127 0 125 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 1386 0 1370 1 0 1 1 0 8 0 zombiepl 144 1440 0 1436 1 0 1 1 0 8 0 processpl 1232 1486 0 1436 5 1 4 5 0 8 0 procpl 664 3085 0 3031 6 0 6 6 0 8 0 sosppl 176 10 0 10 2 1 1 1 0 8 1 sockpl 752 2189 0 2154 25 12 13 17 0 8 8 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 13 0 0 2 0 2 2 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 36 0 0 5 0 5 5 0 8 0 mtagpl 96 117 0 0 3 0 3 3 0 8 0 mbufpl 256 889 0 0 56 0 56 56 0 8 0 bufpl 280 12752 0 6616 439 0 439 439 0 8 0 anonpl 32 11842 0 0 96 0 96 96 0 246 0 amapchunkpl 152 47883 0 47365 43 13 30 36 0 158 7 amappl16 200 4992 0 4953 32 17 15 28 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 113 0 113 1 1 0 1 0 8 0 amappl13 176 440 0 439 1 0 1 1 0 8 0 amappl12 168 1831 0 1788 3 0 3 3 0 8 0 amappl11 160 11 0 11 2 2 0 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 87 0 85 1 0 1 1 0 8 0 amappl6 120 292 0 277 1 0 1 1 0 8 0 amappl5 112 76 0 65 1 0 1 1 0 8 0 amappl4 104 435 0 404 1 0 1 1 0 8 0 amappl3 96 7127 0 7032 4 1 3 3 0 8 0 amappl2 88 1585 0 1506 2 0 2 2 0 8 0 amappl1 80 13532 0 12939 14 0 14 14 0 8 0 amappl 88 11286 0 11117 5 0 5 5 0 92 0 uvmvnodes 80 137 0 0 3 0 3 3 0 8 0 dma65536 65536 2 0 2 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 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 9 0 9 3 2 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 21 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1458 0 1426 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1458 0 1426 1 0 1 1 0 8 0 vmmpekpl 168 12515 0 12474 3 0 3 3 0 8 0 vmmpepl 168 96916 0 94934 111 2 109 109 0 357 13 vmsppl 488 1457 0 1426 5 1 4 5 0 8 0 rwobjpl 80 27304 0 26209 33 0 33 33 0 8 2 pdppl 4096 2929 0 2856 104 30 74 83 0 8 1 pvpl 32 21869 0 0 177 0 177 177 0 265 0 pmappl 256 1460 0 1427 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 356 0 42 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 witness_checkorder(ffffffff839a0d90,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1 mtx_enter(ffffffff839a0d80) at mtx_enter+0x95 sys/kern/kern_lock.c:406 sleep_setup(ffff8000299dee80,220,ffffffff834333f5) at sleep_setup+0xed sys/kern/kern_synch.c:304 msleep_nsec(ffff8000299dee80,ffff8000299dee20,220,ffffffff834333f5,ffffffffffffffff) at msleep_nsec+0x10b sys/kern/kern_synch.c:217 dt_ioctl_record_stop(ffff80000159b000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(21e5f,81,2000,ffff8000fffe7248) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffe7248) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003a3f8570) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c294d90,81,fffffd80097fd820,ffff8000fffe7248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ccc92a8,ffff8000fffe7248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ccc92a8,ffff8000fffe7248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ccc92a8,ffff8000fffe7248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ccc92a8,ffff8000fffe7248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000fffe7248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000fffe7248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe7248,ffff80003a3f88e0,ffff80003a3f8830) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003a3f88e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003a3f88e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x712d1bafa460, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 mtx_enter(ffff8000299dee20) at mtx_enter+0x37b sys/kern/kern_lock.c:454 clockintr_dispatch(ffff80002a21c400) at clockintr_dispatch+0x401 sys/kern/kern_clockintr.c:215 lapic_clockintr(0,0) at lapic_clockintr+0x51 sys/arch/amd64/amd64/lapic.c:482 Xresume_lapic_ltimer() at Xresume_lapic_ltimer+0x2a acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -9