panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 995 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 52097 26973 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc22f10,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003bc22f08) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c4594a8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003affb770) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805eaeec28,1,fffffd807f7d3410,ffff80003c4594a8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80614336d0,ffff80003c4594a8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd80614336d0,ffff80003c4594a8) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c4594a8) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c4594a8,b,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c4594a8,ffff80003affbae0,ffff80003affba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003affbad0, count: 0 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 995 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc22f10,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003bc22f08) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c4594a8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003affb770) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805eaeec28,1,fffffd807f7d3410,ffff80003c4594a8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80614336d0,ffff80003c4594a8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd80614336d0,ffff80003c4594a8) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c4594a8) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c4594a8,b,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c4594a8,ffff80003affbae0,ffff80003affba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003affbae0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003affbae0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x719e61494e50, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003affb540 rbx 0xffffffff8382fdcf cpu_info_full_primary+0x2dcf rdx 0 rcx 0xffff80003c4594a8 rax 0xffffffff8382eff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x88670f218bf8388e r11 0x9d9cf53f1d280d53 r12 0xffffffff8382fbd0 cpu_info_full_primary+0x2bd0 r13 0 r14 0 r15 0x1 rip 0xffffffff8275db55 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003affb530 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=210680 pid=72223 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c4594a8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a296cf0,0xffff80002a297c60 process=0xffff80003bc1ef50 user=0xffff80003aff6000, vmspace=0xfffffd806becc018 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 8947 424797 66808 0 2 0xc80 syz-executor 8947 3854 66808 0 2 0x4000000 syz-executor 81263 337148 8132 0 3 0x80 nanoslp syz-executor 81263 391152 8132 0 3 0x4000080 ttyin syz-executor 42958 524 72239 0 3 0x80 nanoslp syz-executor 42958 256247 72239 0 3 0x4000080 fsleep syz-executor 42958 55835 72239 0 2 0x4000000 syz-executor 34444 152998 41435 0 3 0x80 nanoslp syz-executor 34444 413543 41435 0 3 0x4000080 kqread syz-executor 34444 124129 41435 0 3 0x4000080 fsleep syz-executor 72172 285098 72981 0 3 0x80 nanoslp syz-executor 72172 1157 72981 0 3 0x4000080 netcon syz-executor 72172 229589 72981 0 3 0x4000080 fsleep syz-executor 55554 182162 0 0 3 0x14200 acct acct 48057 158029 0 0 3 0x14200 bored sosplice 7183 450901 18403 0 2 0x2 syz-executor 41435 193058 18403 0 3 0x82 nanoslp syz-executor 64179 235580 18403 0 2 0xc82 syz-executor 8132 407792 18403 0 3 0x82 nanoslp syz-executor 72981 365788 18403 0 3 0x82 nanoslp syz-executor 56881 299924 18403 0 3 0x82 nanoslp syz-executor 66808 108700 18403 0 2 0xc82 syz-executor 72239 447940 18403 0 2 0xc82 syz-executor 18403 266797 8326 0 3 0x82 kqread syz-executor 8326 9560 60577 0 3 0x10008a sigsusp ksh 60577 246017 99012 0 3 0x98 kqread sshd-session 99012 441219 63411 0 3 0x92 kqread sshd-session 77 298531 1 0 3 0x100083 ttyin getty 63411 114865 1 0 3 0x88 kqread sshd 72767 103779 95504 74 3 0x1100092 bpf pflogd 95504 80315 1 0 3 0x80 sbwait pflogd 17681 70705 71733 73 3 0x1100090 kqread syslogd 71733 104416 1 0 3 0x100082 sbwait syslogd 56133 279432 1 0 3 0x100080 kqread resolvd 71529 150366 92570 77 2 0x100012 dhcpleased 5430 343122 92570 77 3 0x100092 kqread dhcpleased 92570 155703 1 0 3 0x80 kqread dhcpleased 31382 185546 0 0 3 0x14200 bored smr 95668 69905 0 0 2 0x14200 zerothread 20624 318420 0 0 3 0x14200 aiodoned aiodoned 74934 248537 0 0 3 0x14200 syncer update 4257 437275 0 0 3 0x14200 cleaner cleaner 26973 52097 0 0 7 0x14200 reaper 63603 385747 0 0 3 0x14200 pgdaemon pagedaemon 75680 68506 0 0 3 0x14200 bored viomb 17344 144739 0 0 3 0x40014200 acpi0 acpi0 82828 113998 0 0 3 0x40014200 idle1 79670 345940 0 0 3 0x14200 bored softnet3 2764 523399 0 0 3 0x14200 bored softnet2 61176 22509 0 0 3 0x14200 bored softnet1 38304 182104 0 0 2 0x14200 softnet0 60723 342639 0 0 3 0x14200 bored systqmp 41794 182440 0 0 3 0x14200 bored systq 63503 204441 0 0 3 0x14200 tmoslp softclockmp 36624 510325 0 0 2 0x40014200 softclock 84659 57945 0 0 3 0x40014200 idle0 1 260357 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd800884b0a8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pmap_remove_ptes+0x297 pmap_remove_pv sys/arch/amd64/amd64/pmap.c:-1 [inline] #3 pmap_remove_ptes+0x297 sys/arch/amd64/amd64/pmap.c:1711 #4 pmap_do_remove+0x533 sys/arch/amd64/amd64/pmap.c:1920 #5 uvm_unmap_kill_entry_withlock+0x26f 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 uvmspace_free+0xcd sys/uvm/uvm_map.c:3420 #8 reaper+0x22d sys/kern/kern_exit.c:481 #9 proc_trampoline+0x10 kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11155K 11370K 166960K 11742 0 pcb 18 13K 14K 166960K 130 0 rtable 210 7K 7K 166960K 397 0 pf 35 17K 18K 166960K 80 0 ifaddr 38 6K 8K 166960K 68 0 ifgroup 53 2K 2K 166960K 103 0 sysctl 3 1K 1K 166960K 3 0 counters 66 36K 37K 166960K 242 0 ioctlops 0 0K 4K 166960K 1601 0 iov 0 0K 12K 166960K 13 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1347 85K 85K 166960K 1637 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 14 0 VM map 2 1K 1K 166960K 2 0 sem 7 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 97K 166960K 392 0 sigio 0 0K 0K 166960K 2 0 proc 72 91K 140K 166960K 571 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 0 0K 0K 166960K 40 0 in_multi 78 5K 7K 166960K 114 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 399 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 233 167K 177K 166960K 5382 0 UVM aobj 16 4K 4K 166960K 18 0 pinsyscall 41 82K 108K 166960K 1500 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 18 0 NDP 12 0K 2K 166960K 42 0 temp 36 8650K 8726K 166960K 14890 0 kqueue 14 22K 28K 166960K 67 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 50 0 47 1 0 1 1 0 8 0 rtentry 176 122 0 27 7 1 6 6 0 8 0 unpcb 144 255 0 204 4 0 4 4 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 220 0 212 8 0 8 8 0 8 7 arp 128 19 0 2 1 0 1 1 0 8 0 inpcb 384 671 0 655 22 1 21 21 0 8 19 nd6 144 26 0 6 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 81 0 79 1 0 1 1 0 8 0 pppxif 1504 9 0 8 2 1 1 1 0 8 0 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 1 0 0 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 pfqueue 320 1 0 1 1 1 0 1 0 8 0 pfstitem 24 30 0 0 1 0 1 1 0 8 0 pfstkey 128 31 0 1 1 0 1 1 0 8 0 pfstate 384 31 0 1 3 0 3 3 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 512 0 139 31 2 29 31 0 8 2 art_table 32 513 0 139 4 0 4 4 0 8 0 art_node 16 118 0 32 1 0 1 1 0 8 0 semapl 112 6 0 1 1 0 1 1 0 8 0 shmpl 112 15 0 2 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2097 0 588 96 0 96 96 0 8 0 ffsino 288 2097 0 588 109 0 109 109 0 8 0 nchpl 144 2628 0 936 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 0 1 1 0 8 1 uvmvnodes 80 2321 0 0 48 0 48 48 0 8 0 vnodes 216 2321 0 0 129 0 129 129 0 8 0 namei 1024 8906 0 8905 2 1 1 2 0 8 0 percpumem 16 136 0 88 1 0 1 1 0 8 0 kstatmem 264 52 0 28 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7999 0 7999 4 3 1 3 1 8 1 plimitpl 152 120 0 102 1 0 1 1 0 8 0 sigapl 424 701 0 650 7 1 6 7 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 224 202 0 188 5 0 5 5 0 8 4 pipepl 336 124 0 97 3 0 3 3 0 8 0 fdescpl 520 681 0 651 3 0 3 3 0 8 0 filepl 160 3787 0 3486 19 1 18 18 0 8 5 lockfpl 104 76 0 73 1 0 1 1 0 8 0 lockfspl 48 34 0 31 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 455 0 442 1 0 1 1 0 8 0 zombiepl 144 652 0 650 1 0 1 1 0 8 0 processpl 1208 701 0 650 5 0 5 5 0 8 0 procpl 656 1139 0 1080 6 0 6 6 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sockpl 728 989 0 919 23 7 16 22 0 8 9 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 21 0 0 1 0 1 1 0 8 0 mbufpl 256 188 0 0 12 0 12 12 0 8 0 bufpl 280 2759 0 123 189 0 189 189 0 8 0 anonpl 32 5578 0 0 45 0 45 45 0 246 0 amapchunkpl 152 29008 0 28544 41 6 35 35 0 158 14 amappl16 200 2296 0 2264 5 3 2 5 0 8 0 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 112 0 100 1 0 1 1 0 8 0 amappl13 176 9 0 8 1 0 1 1 0 8 0 amappl12 168 1363 0 1333 4 1 3 3 0 8 0 amappl11 160 51 0 36 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 245 0 245 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 156 0 144 1 0 1 1 0 8 0 amappl6 120 195 0 192 1 0 1 1 0 8 0 amappl5 112 124 0 115 1 0 1 1 0 8 0 amappl4 104 321 0 303 1 0 1 1 0 8 0 amappl3 96 3030 0 2925 5 1 4 4 0 8 0 amappl2 88 640 0 578 2 0 2 2 0 8 0 amappl1 80 9280 0 8684 15 2 13 15 0 8 0 amappl 88 4648 0 4489 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 6 0 6 1 1 0 1 0 8 0 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 17 0 2 1 0 1 1 0 8 0 uaddrrnd 24 681 0 651 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 681 0 651 1 0 1 1 0 8 0 vmmpekpl 168 7064 0 7021 3 0 3 3 0 8 0 vmmpepl 168 48958 0 47028 91 1 90 90 0 357 0 vmsppl 480 680 0 651 5 1 4 5 0 8 0 rwobjpl 72 17871 0 14619 60 0 60 60 0 8 0 pdppl 4096 1369 0 1302 103 32 71 87 0 8 4 pvpl 32 14295 0 0 116 0 116 116 0 265 0 pmappl 256 680 0 651 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 398 0 38 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(ffffffff8345fc2b) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409380,ffffffff8340ed96,3e3,ffffffff8340edde) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc22f10,ffffffff8334f63d) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80003bc22f08) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80003c4594a8) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003affb770) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805eaeec28,1,fffffd807f7d3410,ffff80003c4594a8) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80614336d0,ffff80003c4594a8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80614336d0,ffff80003c4594a8) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd80614336d0,ffff80003c4594a8) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80003c4594a8) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80003c4594a8,b,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80003c4594a8,ffff80003affbae0,ffff80003affba30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003affbae0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003affbae0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x719e61494e50, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp 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 __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffccd8) at reaper+0x232 sys/kern/kern_exit.c:482 end trace frame: 0x0, count: 10 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 __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f9c78) at __mp_lock+0x192 sys/kern/kern_lock.c:144 reaper(ffff8000ffffccd8) at reaper+0x232 sys/kern/kern_exit.c:482 end trace frame: 0x0, count: -5