panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *422512 76663 0 0 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834510ef) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348bb2c,ffffffff83498c74,3bb,ffffffff834c0ff0) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a24f780,ffffffff834485a3) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff8000343b2000,ffff80002a24f778) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff8000fffee7e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4e7c20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a22d6d8,2,fffffd80097fd4e0,ffff8000fffee7e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ee5e630,ffff8000fffee7e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd805ee5e630,ffff8000fffee7e0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c4e7e80) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e7e80) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x199ff799cd0, count: 2 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834510ef) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348bb2c,ffffffff83498c74,3bb,ffffffff834c0ff0) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a24f780,ffffffff834485a3) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff8000343b2000,ffff80002a24f778) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff8000fffee7e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4e7c20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a22d6d8,2,fffffd80097fd4e0,ffff8000fffee7e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ee5e630,ffff8000fffee7e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd805ee5e630,ffff8000fffee7e0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c4e7e80) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e7e80) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x199ff799cd0, count: -13 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c4e79f0 rbx 0xffffffff8391de07 cpu_info_full_primary+0x2e07 rdx 0xffff8000015f4c00 rcx 0xffff8000fffee7e0 rax 0xffffffff8391cff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xbb506794904256e4 r11 0xa69c65304d1fcfeb r12 0xffffffff8391dc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff827a3b95 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c4e79e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=422512 pid=76663 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c3e7a28,0xffffffff839e1410 process=0xffff80003c3ea6a0 user=0xffff80003c4e2000, vmspace=0xfffffd806c8c65d0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10520 65439 7846 0 2 0 syz-executor 10520 86801 7846 0 3 0x4000080 fsleep syz-executor 98886 5835 33148 0 2 0 syz-executor 98886 191891 33148 0 2 0x4000000 syz-executor 76663 468344 53554 0 2 0 syz-executor 76663 116411 53554 0 3 0x4000000 smrbar syz-executor *76663 422512 53554 0 7 0x4000000 syz-executor 6111 409017 96754 -1 2 0xc90 syz-executor 6111 150747 96754 -1 3 0x4000090 kqsel syz-executor 6111 271071 96754 -1 3 0x4000090 fsleep syz-executor 55209 371689 80384 0 2 0xc80 syz-executor 55209 238220 80384 0 2 0x4000000 syz-executor 55209 368001 80384 0 3 0x4000080 fsleep syz-executor 2336 28662 17325 0 3 0x3000 suspend syz-executor 2336 337977 17325 0 2 0x4081000 syz-executor 2336 150926 17325 0 3 0x4081000 inode syz-executor 89696 15969 27725 0 4 0x82000 syz-executor 89696 402133 27725 0 2 0x4082000 syz-executor 89696 246298 27725 0 3 0x4082000 inode syz-executor 89696 502749 27725 0 3 0x4002000 suspend syz-executor 33148 301302 26368 0 2 0xc82 syz-executor 53554 366626 26368 0 2 0xc82 syz-executor 27725 447160 26368 0 3 0x82 wait syz-executor 17325 393265 26368 0 3 0x82 wait syz-executor 80384 115445 26368 0 2 0xc82 syz-executor 7846 521988 26368 0 2 0xc82 syz-executor 44098 230764 1 0 3 0x100083 ttyin getty 87667 322428 0 0 3 0x14280 nfsidl nfsio 71881 21595 0 0 3 0x14280 nfsidl nfsio 3332 513171 0 0 3 0x14280 nfsidl nfsio 81000 97738 0 0 3 0x14280 nfsidl nfsio 32650 291707 0 0 3 0x14280 nfsidl nfsio 27868 39672 0 0 3 0x14280 nfsidl nfsio 38430 38842 0 0 3 0x14280 nfsidl nfsio 93187 306860 0 0 3 0x14280 nfsidl nfsio 4015 466862 0 0 3 0x14280 nfsidl nfsio 73198 249121 0 0 3 0x14280 nfsidl nfsio 87350 125602 0 0 3 0x14280 nfsidl nfsio 62824 206036 0 0 3 0x14280 nfsidl nfsio 57149 417948 0 0 3 0x14280 nfsidl nfsio 12190 484875 0 0 3 0x14280 nfsidl nfsio 32121 342528 0 0 3 0x14280 nfsidl nfsio 48644 321605 0 0 3 0x14280 nfsidl nfsio 33563 29138 0 0 3 0x14280 nfsidl nfsio 64889 309476 0 0 3 0x14280 nfsidl nfsio 98933 348075 0 0 3 0x14280 nfsidl nfsio 23675 358054 0 0 3 0x14280 nfsidl nfsio 43982 76109 26368 0 2 0xc82 syz-executor 96754 155654 26368 0 2 0xc82 syz-executor 26368 388794 46847 0 3 0x82 kqread syz-executor 46847 66951 35376 0 3 0x10008a sigsusp ksh 35376 458717 38049 0 3 0x98 kqread sshd-session 38049 200615 87930 0 3 0x92 kqread sshd-session 87930 388203 1 0 3 0x88 kqread sshd 66719 101638 31054 74 3 0x1100092 bpf pflogd 31054 340946 1 0 3 0x80 sbwait pflogd 87617 222904 69942 73 3 0x1100090 kqread syslogd 69942 297216 1 0 3 0x100082 sbwait syslogd 96083 300219 1 0 3 0x100080 kqread resolvd 31440 459456 10575 77 3 0x100092 kqread dhcpleased 42568 367857 10575 77 3 0x100092 kqread dhcpleased 10575 149936 1 0 3 0x80 kqread dhcpleased 73010 402301 0 0 2 0x14200 smr 3355 256764 0 0 2 0x14200 zerothread 30940 257106 0 0 3 0x14200 aiodoned aiodoned 37661 483165 0 0 3 0x14200 syncer update 96878 76236 0 0 3 0x14200 cleaner cleaner 19565 60813 0 0 3 0x14200 reaper reaper 92323 451487 0 0 3 0x14200 pgdaemon pagedaemon 72024 160150 0 0 3 0x14200 bored viomb 140 409489 0 0 3 0x40014200 acpi0 acpi0 44129 35943 0 0 7 0x40014200 idle1 66162 276076 0 0 3 0x14200 bored softnet1 78104 389498 0 0 3 0x14200 bored softnet0 18599 365484 0 0 3 0x14200 bored systqmp 30729 411154 0 0 3 0x14200 bored systq 97638 325237 0 0 3 0x14200 tmoslp softclockmp 19517 57934 0 0 3 0x40014200 tmoslp softclock 4700 160793 0 0 3 0x40014200 idle0 1 171523 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 98886 (syz-executor) thread 0xffff80003c3e6568 (191891) Process 76663 (syz-executor) thread 0xffff8000fffee7e0 (422512) Process 55209 (syz-executor) thread 0xffff80003c3f8fb8 (238220) Process 2336 (syz-executor) thread 0xffff800039bd9248 (337977) Process 2336 (syz-executor) thread 0xffff8000fffee018 (150926) Process 89696 (syz-executor) thread 0xffff8000fffef770 (402133) Process 89696 (syz-executor) thread 0xffff8000fffeea78 (246298) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11111 12247K 13919K 166960K 15419 0 pcb 17 18K 30K 166960K 658 0 rtable 244 15K 15K 166960K 958 0 pf 42 19K 21K 166960K 232 0 ifaddr 41 7K 7K 166960K 152 0 ifgroup 61 2K 2K 166960K 260 0 sysctl 4 1K 9K 166960K 19 0 counters 76 37K 38K 166960K 270 0 ioctlops 0 0K 4K 166960K 1903 0 iov 0 0K 28K 166960K 108 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1436 90K 91K 166960K 3461 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 36 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 136 0 dirhash 12 2K 2K 166960K 57 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2172 0 sigio 0 0K 0K 166960K 117 0 proc 72 115K 180K 166960K 937 0 subproc 72 4K 4K 166960K 137 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 236 0 in_multi 67 5K 7K 166960K 257 0 ether_multi 1 0K 0K 166960K 18 0 mrt 1 0K 0K 166960K 44 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 1149 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 271 153K 178K 166960K 21960 0 UVM aobj 11 14K 14K 166960K 11 0 pinsyscall 43 86K 110K 166960K 3650 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 192 0 NDP 14 0K 2K 166960K 110 0 temp 84 9084K 9164K 166960K 84035 0 kqueue 14 22K 29K 166960K 400 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 120 183 0 180 1 0 1 1 0 8 0 rtentry 176 261 0 175 6 1 5 6 0 8 0 unpcb 144 1815 0 1793 21 15 6 6 0 8 5 syncache 336 19 0 19 5 4 1 1 0 8 1 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 766 0 758 22 20 2 7 0 8 1 arp 136 48 0 30 1 0 1 1 0 8 0 inpcb 328 2700 0 2689 33 22 11 13 0 8 8 nd6 152 52 0 37 1 0 1 1 0 8 0 pkpcb 40 16 0 16 3 2 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 ppxss 1192 73 0 72 3 2 1 1 0 8 0 pppxif 1576 3 0 2 3 2 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 22 0 6 1 0 1 1 0 482 0 pffrnode 88 16 0 3 1 0 1 1 0 8 0 pffrent 40 34 0 18 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 8 0 5 1 0 1 1 0 8 0 pfanchor 1288 2 0 1 2 1 1 1 0 8 0 pftag 88 3 0 2 2 1 1 1 0 8 0 pfstitem 24 124 0 64 1 0 1 1 0 8 0 pfstkey 128 127 0 67 3 0 3 3 0 8 0 pfstate 448 125 0 66 9 0 9 9 0 8 0 pfrule 1360 36 0 26 2 1 1 2 0 8 0 rttmr 136 4 0 4 2 1 1 1 0 8 1 art_heap8 4096 7 0 1 7 1 6 6 0 8 0 art_heap4 256 1013 0 676 37 15 22 29 0 8 0 art_table 40 1020 0 677 5 0 5 5 0 8 0 art_node 32 256 0 180 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 3 1 1 0 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 132 0 122 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 47 0 30 3 0 3 3 0 8 0 dino2pl 256 5727 0 4254 93 0 93 93 0 8 0 ffsino 296 5727 0 4254 114 0 114 114 0 8 0 nchpl 144 8634 0 6905 65 0 65 65 0 8 0 rtmask 32 17 0 17 5 4 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 31070 0 31068 5 4 1 2 0 8 0 percpumem 16 150 0 97 1 0 1 1 0 8 0 vcpupl 3968 5 0 0 1 0 1 1 0 8 0 vmpool 848 5 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 1 2 1 1 1 0 8 0 kstatmem 264 162 0 130 3 0 3 3 0 8 0 scsiplug 72 14 0 14 5 4 1 1 0 8 1 scxspl 216 60809 0 60809 13 12 1 8 1 8 1 plimitpl 152 756 0 736 1 0 1 1 0 8 0 sigapl 424 2519 0 2451 10 2 8 9 0 8 0 knotepl 120 615 0 0 18 0 18 18 0 8 0 kqueuepl 224 1012 0 999 13 12 1 9 0 8 0 pipepl 344 347 0 320 6 3 3 6 0 8 0 fdescpl 528 2476 0 2444 3 0 3 3 0 8 0 filepl 160 17473 0 17238 36 17 19 19 0 8 5 lockfpl 104 1376 0 1372 4 3 1 2 0 8 0 lockfspl 48 397 0 393 1 0 1 1 0 8 0 sessionpl 144 48 0 39 1 0 1 1 0 8 0 pgrppl 48 98 0 81 1 0 1 1 0 8 0 ucredpl 104 2561 0 2546 1 0 1 1 0 8 0 zombiepl 144 2533 0 2531 1 0 1 1 0 8 0 processpl 1232 2519 0 2451 6 0 6 6 0 8 0 procpl 664 5833 0 5752 8 0 8 8 0 8 0 sosppl 176 16 0 16 3 3 0 1 0 8 0 sockpl 752 4837 0 4801 71 57 14 18 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 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 121 0 0 15 0 15 15 0 8 0 mcl2k 2048 44 0 0 5 0 5 5 0 8 0 mtagpl 96 19 0 0 1 0 1 1 0 8 0 mbufpl 256 1856 0 0 115 0 115 115 0 8 0 bufpl 280 24112 0 17981 439 0 439 439 0 8 0 anonpl 32 13521 0 0 109 0 109 109 0 246 0 amapchunkpl 152 74332 0 73589 64 33 31 44 0 158 2 amappl16 200 8665 0 8307 69 50 19 27 0 8 0 amappl15 192 6 0 6 3 3 0 1 0 8 0 amappl14 184 512 0 510 1 0 1 1 0 8 0 amappl13 176 186 0 174 1 0 1 1 0 8 0 amappl12 168 2776 0 2745 2 0 2 2 0 8 0 amappl11 160 34 0 33 1 0 1 1 0 8 0 amappl10 152 80 0 66 1 0 1 1 0 8 0 amappl9 144 266 0 265 2 1 1 1 0 8 0 amappl8 136 130 0 127 1 0 1 1 0 8 0 amappl7 128 210 0 195 1 0 1 1 0 8 0 amappl6 120 242 0 240 1 0 1 1 0 8 0 amappl5 112 147 0 135 1 0 1 1 0 8 0 amappl4 104 396 0 375 1 0 1 1 0 8 0 amappl3 96 14977 0 14846 4 0 4 4 0 8 0 amappl2 88 854 0 792 2 0 2 2 0 8 0 amappl1 80 25997 0 25389 23 7 16 17 0 8 1 amappl 88 20632 0 20432 5 0 5 5 0 92 0 uvmvnodes 80 173 0 0 4 0 4 4 0 8 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 6 0 6 1 1 0 1 0 8 0 dma128 128 260 0 260 4 4 0 1 0 8 0 dma64 64 10 0 10 3 3 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 10 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2476 0 2444 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2476 0 2444 1 0 1 1 0 8 0 vmmpekpl 168 22777 0 22713 5 1 4 4 0 8 0 vmmpepl 168 172495 0 170147 136 31 105 117 0 357 1 vmsppl 488 2475 0 2444 5 0 5 5 0 8 0 rwobjpl 80 49685 0 48189 39 6 33 36 0 8 0 pdppl 4096 4969 0 4893 155 79 76 87 0 8 0 pvpl 32 22170 0 0 179 0 179 179 0 265 0 pmappl 256 2480 0 2444 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 483 0 126 11 0 11 11 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 panic(ffffffff834510ef) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8348bb2c,ffffffff83498c74,3bb,ffffffff834c0ff0) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a24f780,ffffffff834485a3) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff8000343b2000,ffff80002a24f778) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff8000fffee7e0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4e7c20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806a22d6d8,2,fffffd80097fd4e0,ffff8000fffee7e0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805ee5e630,ffff8000fffee7e0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805ee5e630,ffff8000fffee7e0) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffd805ee5e630,ffff8000fffee7e0) at closef+0x192 sys/kern/kern_descrip.c:1265 syscall(ffff80003c4e7e80) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4e7e80) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x199ff799cd0, count: -13 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299bdff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299bdff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff8000299bdff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299bdff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5