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 9672 9401 0 0 0x1 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b37c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f1977,ffffffff83403a3d,3bb,ffffffff8342dce7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42b4f8,ffffffff833ac250) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42b4f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000333e3248) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a382a20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fb538d0,81,fffffd80097fd548,ffff8000333e3248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805eab38b0,ffff8000333e3248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805eab38b0,ffff8000333e3248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000333e3248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000333e3248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000333e3248,ffff80002a382d90,ffff80002a382ce0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a382d80, 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 955 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b37c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f1977,ffffffff83403a3d,3bb,ffffffff8342dce7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42b4f8,ffffffff833ac250) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42b4f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000333e3248) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a382a20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fb538d0,81,fffffd80097fd548,ffff8000333e3248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805eab38b0,ffff8000333e3248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805eab38b0,ffff8000333e3248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000333e3248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000333e3248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000333e3248,ffff80002a382d90,ffff80002a382ce0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a382d90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a382d90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72de8852dbb0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a3827f0 rbx 0xffffffff838a9e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000333e3248 rax 0xffffffff838a8ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x925bca4899422f01 r11 0xb294327030aeecbd r12 0xffffffff838a9c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff816a7645 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3827e0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=429769 pid=57727 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=82, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000333e3248 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000333e2d18,0xffff8000333e2030 process=0xffff80003c4d9838 user=0xffff80002a37d000, vmspace=0xfffffd806c96a200 estcpu=32, cpticks=8, pctcpu=0.7, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 98668 309046 77913 0 2 0xc80 syz-executor 98668 438034 77913 0 3 0x4000000 smrbar syz-executor 98668 408405 77913 0 3 0x4000080 fsleep syz-executor 28040 421601 66272 0 2 0xc80 syz-executor 28040 157599 66272 0 3 0x4000080 kqread syz-executor 28040 358610 66272 0 3 0x4000080 fsleep syz-executor 28040 245906 66272 0 3 0x4000080 fsleep syz-executor 97418 509160 76771 0 2 0xc80 syz-executor 97418 453705 76771 0 3 0x4000080 ttyout syz-executor 97418 120898 76771 0 3 0x4000080 fsleep syz-executor 11708 82375 68417 0 3 0x80 nanoslp syz-executor 11708 498144 68417 0 3 0x4000080 netacc syz-executor 11708 219234 68417 0 3 0x4000080 fsleep syz-executor 9401 9672 16918 0 7 0x1 syz-executor 9401 188002 16918 0 3 0x4000080 fsleep syz-executor 9401 304708 16918 0 3 0x4000080 kqpoll syz-executor 92276 261574 1 0 3 0x100083 ttyopn getty 40988 422798 38128 0 2 0xc82 syz-executor 76771 438963 38128 0 2 0xc82 syz-executor 16918 368295 38128 0 2 0xc82 syz-executor 68417 381948 38128 0 3 0x82 nanoslp syz-executor 84762 337310 0 0 3 0x14280 nfsidl nfsio 18810 80815 0 0 3 0x14280 nfsidl nfsio 18523 431235 0 0 3 0x14280 nfsidl nfsio 76151 236548 0 0 3 0x14280 nfsidl nfsio 98348 343854 0 0 3 0x14280 nfsidl nfsio 42862 11618 0 0 3 0x14280 nfsidl nfsio 72362 186093 0 0 3 0x14280 nfsidl nfsio 9157 208599 0 0 3 0x14280 nfsidl nfsio 25141 69031 0 0 3 0x14280 nfsidl nfsio 90087 108774 0 0 3 0x14280 nfsidl nfsio 68370 171675 0 0 3 0x14280 nfsidl nfsio 34548 138552 0 0 3 0x14280 nfsidl nfsio 37886 10694 0 0 3 0x14280 nfsidl nfsio 3768 90341 0 0 3 0x14280 nfsidl nfsio 99308 221785 0 0 3 0x14280 nfsidl nfsio 97261 216917 0 0 3 0x14280 nfsidl nfsio 92667 131603 0 0 3 0x14280 nfsidl nfsio 63182 63693 0 0 3 0x14280 nfsidl nfsio 65633 323275 0 0 3 0x14280 nfsidl nfsio 20354 283482 0 0 3 0x14280 nfsidl nfsio 23110 345382 38128 0 3 0x82 wait syz-executor 66272 320826 38128 0 2 0xc82 syz-executor 77913 109342 38128 0 3 0x82 nanoslp syz-executor 93559 47779 38128 0 2 0xc82 syz-executor 38128 86116 12075 0 3 0x82 kqread syz-executor 12075 43931 74377 0 3 0x10008a sigsusp ksh 74377 299548 27980 0 3 0x98 kqread sshd-session 27980 130755 77763 0 3 0x92 kqread sshd-session 77763 135581 1 0 3 0x88 kqread sshd 72133 398221 77323 74 3 0x1100092 bpf pflogd 77323 311180 1 0 3 0x80 sbwait pflogd 20574 503797 58942 73 3 0x1100090 kqread syslogd 58942 8774 1 0 3 0x100082 sbwait syslogd 33719 197459 1 0 3 0x100080 kqread resolvd 28718 365984 20930 77 3 0x100092 kqread dhcpleased 46837 186678 20930 77 3 0x100092 kqread dhcpleased 20930 109751 1 0 3 0x80 kqread dhcpleased 50995 38497 0 0 3 0x14200 bored smr 33009 56916 0 0 3 0x14200 pgzero zerothread 23404 64775 0 0 3 0x14200 aiodoned aiodoned 79722 32865 0 0 3 0x14200 syncer update 2303 306688 0 0 3 0x14200 cleaner cleaner 58547 442053 0 0 2 0x14200 reaper 16244 164853 0 0 3 0x14200 pgdaemon pagedaemon 89024 327958 0 0 3 0x14200 bored viomb 29529 211690 0 0 3 0x40014200 acpi0 acpi0 7694 313057 0 0 3 0x40014200 idle1 45742 316219 0 0 3 0x14200 bored softnet1 91592 420025 0 0 3 0x14200 bored softnet0 20414 504077 0 0 3 0x14200 bored systqmp 33110 348045 0 0 3 0x14200 bored systq 3547 79685 0 0 3 0x14200 tmoslp softclockmp 95557 333698 0 0 3 0x40014200 tmoslp softclock 74810 374964 0 0 3 0x40014200 idle0 1 425474 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11090 12125K 16313K 166960K 14470 0 pcb 20 20K 25K 166960K 833 0 rtable 254 13K 13K 166960K 870 0 pf 47 20K 83K 166960K 309 0 ifaddr 40 7K 8K 166960K 205 0 ifgroup 64 2K 3K 166960K 357 0 sysctl 4 1K 9K 166960K 22 0 counters 76 37K 38K 166960K 408 0 ioctlops 0 0K 6K 166960K 2147 0 iov 0 0K 20K 166960K 122 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1514 95K 95K 166960K 3606 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 229 0 dirhash 12 2K 2K 166960K 60 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 2322 0 sigio 0 0K 0K 166960K 48 0 proc 73 115K 164K 166960K 908 0 subproc 72 4K 4K 166960K 130 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 567 0 in_multi 74 5K 7K 166960K 276 0 ether_multi 1 0K 0K 166960K 15 0 mrt 4 0K 0K 166960K 11 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 139 625K 625K 166960K 139 0 exec 0 0K 1K 166960K 762 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 283 164K 178K 166960K 23292 0 UVM aobj 128 21K 22K 166960K 200 0 pinsyscall 43 86K 104K 166960K 3603 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 171 0 NDP 14 0K 2K 166960K 144 0 temp 80 8684K 8940K 166960K 71964 0 kqueue 15 22K 35K 166960K 510 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 120 258 0 255 2 1 1 2 0 8 0 rtentry 176 274 0 176 5 0 5 5 0 8 0 unpcb 144 1944 0 1925 15 9 6 6 0 8 5 syncache 336 7 0 7 3 3 0 1 0 8 0 tcpcb 736 859 0 854 16 12 4 7 0 8 3 arp 136 50 0 23 1 0 1 1 0 8 0 inpcb 328 3210 0 3195 30 20 10 13 0 8 8 nd6 152 51 0 27 2 0 2 2 0 8 0 pkpcb 40 22 0 22 2 1 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 132 0 131 2 1 1 1 0 8 0 pppxif 1504 15 0 14 3 2 1 1 0 8 0 pfstscr 40 39 0 38 4 3 1 1 0 8 0 pffrag 232 38 0 25 1 0 1 1 0 482 0 pffrnode 88 36 0 25 1 0 1 1 0 8 0 pffrent 40 69 0 55 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 2 0 2 2 2 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 6 0 0 1 0 1 1 0 8 0 pfstkey 128 86 0 80 2 1 1 1 0 8 0 pfstate 448 43 0 40 2 1 1 1 0 8 0 pfrule 1360 11 0 7 2 1 1 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1269 0 849 37 8 29 32 0 8 2 art_table 40 1273 0 849 6 0 6 6 0 8 0 art_node 32 271 0 182 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 1 0 1 0 8 0 semupl 112 4 0 4 4 3 1 1 0 8 1 semapl 112 221 0 211 1 0 1 1 0 8 0 shmpl 112 121 0 3 4 0 4 4 0 8 0 dirhash 1024 49 0 32 3 0 3 3 0 8 0 dino2pl 256 5913 0 4393 96 0 96 96 0 8 0 ffsino 296 5913 0 4393 118 0 118 118 0 8 0 nchpl 144 9003 0 7272 65 0 65 65 0 8 0 rtmask 32 26 0 26 3 2 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 31303 0 31303 4 2 2 2 0 8 2 percpumem 16 219 0 166 1 0 1 1 0 8 0 vcpupl 3968 7 0 0 1 0 1 1 0 8 0 vmpool 848 75 0 68 1 0 1 1 0 8 0 kstatmem 264 234 0 202 5 2 3 3 0 8 0 scsiplug 72 15 0 15 2 1 1 1 0 8 1 scxspl 216 61792 0 61792 15 12 3 8 1 8 3 plimitpl 152 584 0 566 1 0 1 1 0 8 0 sigapl 424 2615 0 2547 8 0 8 8 0 8 0 knotepl 120 736 0 0 23 0 23 23 0 8 0 kqueuepl 224 978 0 965 10 8 2 5 0 8 1 pipepl 344 569 0 542 16 7 9 9 0 8 6 fdescpl 528 2573 0 2541 3 0 3 3 0 8 0 filepl 160 18570 0 18333 41 21 20 23 0 8 7 lockfpl 104 743 0 740 1 0 1 1 0 8 0 lockfspl 48 322 0 319 1 0 1 1 0 8 0 sessionpl 144 34 0 25 1 0 1 1 0 8 0 pgrppl 48 80 0 63 1 0 1 1 0 8 0 ucredpl 104 3138 0 3124 1 0 1 1 0 8 0 zombiepl 144 2550 0 2547 1 0 1 1 0 8 0 processpl 1232 2615 0 2547 6 0 6 6 0 8 0 procpl 664 6346 0 6266 8 0 8 8 0 8 0 sosppl 176 23 0 22 2 1 1 1 0 8 0 sockpl 752 5510 0 5473 62 50 12 24 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 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 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 5 0 5 5 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 1202 0 0 74 0 74 74 0 8 0 bufpl 280 24552 0 18416 439 0 439 439 0 8 0 anonpl 32 13765 0 0 112 0 112 112 0 246 0 amapchunkpl 152 78669 0 78050 42 9 33 35 0 158 7 amappl16 200 9646 0 9606 56 41 15 35 0 8 5 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 9 0 9 2 2 0 1 0 8 0 amappl13 176 508 0 507 1 0 1 1 0 8 0 amappl12 168 2981 0 2938 3 0 3 3 0 8 0 amappl11 160 7 0 6 1 0 1 1 0 8 0 amappl10 152 51 0 37 1 0 1 1 0 8 0 amappl9 144 252 0 251 1 0 1 1 0 8 0 amappl8 136 91 0 88 1 0 1 1 0 8 0 amappl7 128 104 0 103 1 0 1 1 0 8 0 amappl6 120 360 0 346 1 0 1 1 0 8 0 amappl5 112 76 0 65 1 0 1 1 0 8 0 amappl4 104 492 0 462 1 0 1 1 0 8 0 amappl3 96 13850 0 13738 4 1 3 3 0 8 0 amappl2 88 2695 0 2617 2 0 2 2 0 8 0 amappl1 80 19042 0 18452 14 0 14 14 0 8 0 amappl 88 22034 0 21830 5 0 5 5 0 92 0 uvmvnodes 80 205 0 0 5 0 5 5 0 8 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 3 3 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 128 257 0 257 3 3 0 1 0 8 0 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 21 0 20 1 0 1 1 0 8 0 aobjpl 72 199 0 72 3 0 3 3 0 8 0 uaddrrnd 24 2573 0 2541 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2573 0 2541 1 0 1 1 0 8 0 vmmpekpl 168 22060 0 22002 3 0 3 3 0 8 0 vmmpepl 168 167990 0 165963 124 25 99 115 0 357 3 vmsppl 488 2572 0 2541 5 0 5 5 0 8 0 rwobjpl 80 45769 0 44455 38 6 32 35 0 8 0 pdppl 4096 5303 0 5225 117 39 78 81 0 8 0 pvpl 32 20434 0 0 165 0 165 165 0 265 0 pmappl 256 2647 0 2609 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 394 0 74 10 0 10 10 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(ffffffff833b37c6) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833f1977,ffffffff83403a3d,3bb,ffffffff8342dce7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c42b4f8,ffffffff833ac250) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80003c42b4f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000333e3248) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a382a20) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fb538d0,81,fffffd80097fd548,ffff8000333e3248) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805eab38b0,ffff8000333e3248) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805eab38b0,ffff8000333e3248) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805eab38b0,ffff8000333e3248) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000333e3248) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000333e3248,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000333e3248,ffff80002a382d90,ffff80002a382ce0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a382d90) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a382d90) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72de8852dbb0, 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(ffffffff839ad440) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ad440) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsyscall(ffff8000333e2d18,1,8,ffff80002a2e3930) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000333e2d18,1,8,ffff80002a2e3930) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a2e3930) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a2e3930) at syscall+0x304 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x756c36961320, count: 8 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(ffffffff839ad440) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839ad440) at __mp_lock+0x192 sys/kern/kern_lock.c:173 ktrsyscall(ffff8000333e2d18,1,8,ffff80002a2e3930) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000333e2d18,1,8,ffff80002a2e3930) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80002a2e3930) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80002a2e3930) at syscall+0x304 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x756c36961320, count: -7