panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 407300 78258 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336c0d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af75e,ffffffff833bfb70,3b7,ffffffff833e956e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034c074e8,ffffffff83366341) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034c074e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c03b798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c51ae40) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80617ec890,83,fffffd80097fb680,ffff80003c03b798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7bc860,ffff80003c03b798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7bc860,ffff80003c03b798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c03b798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c03b798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c03b798,ffff80003c51b1b0,ffff80003c51b100) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c51b1a0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336c0d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af75e,ffffffff833bfb70,3b7,ffffffff833e956e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034c074e8,ffffffff83366341) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034c074e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c03b798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c51ae40) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80617ec890,83,fffffd80097fb680,ffff80003c03b798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7bc860,ffff80003c03b798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7bc860,ffff80003c03b798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c03b798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c03b798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c03b798,ffff80003c51b1b0,ffff80003c51b100) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c51b1b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c51b1b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb9e221b770, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c51ac10 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff80003c03b798 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x1131fb0aa5e1287c r11 0xb154f2899dda553d r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff8314ee75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c51ac00 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=323152 pid=36822 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c03b798 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c454fb8,0xffff80003c03ad48 process=0xffff80003c0253a0 user=0xffff80003c516000, vmspace=0xfffffd806b8bf7b8 estcpu=33, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 88977 488234 33777 0 2 0x40 syz-executor 78258 407300 52591 0 7 0 syz-executor 78258 142575 52591 0 3 0x4000000 smrbar syz-executor 46822 91128 6359 0 2 0 syz-executor 46822 343588 6359 0 3 0x4000080 fsleep syz-executor 46822 108585 6359 0 2 0x4000000 syz-executor 43906 427784 99143 60929 3 0x90 nanoslp syz-executor 43906 379798 99143 60929 3 0x4000090 msgwait syz-executor 43906 219846 99143 60929 3 0x4000090 fsleep syz-executor 55713 353774 48659 0 3 0x80 nanoslp syz-executor 55713 275607 48659 0 3 0x4000080 sbwait syz-executor 55713 36941 48659 0 3 0x4000080 fsleep syz-executor 33777 291947 37942 0 3 0x82 ppwait syz-executor 29349 323444 1 0 3 0x100083 ttyin getty 52591 146194 37942 0 3 0x82 nanoslp syz-executor 98258 59184 37942 0 3 0x82 nanoslp syz-executor 8231 66803 0 0 3 0x14280 nfsidl nfsio 39501 65785 0 0 3 0x14280 nfsidl nfsio 78622 360404 0 0 3 0x14280 nfsidl nfsio 19464 464282 0 0 3 0x14280 nfsidl nfsio 50479 52722 0 0 3 0x14280 nfsidl nfsio 37205 289977 0 0 3 0x14280 nfsidl nfsio 96616 435734 0 0 3 0x14280 nfsidl nfsio 32537 39588 0 0 3 0x14280 nfsidl nfsio 86099 420754 0 0 3 0x14280 nfsidl nfsio 65236 107259 0 0 3 0x14280 nfsidl nfsio 80398 386237 0 0 3 0x14280 nfsidl nfsio 66817 247098 0 0 3 0x14280 nfsidl nfsio 7307 16407 0 0 3 0x14280 nfsidl nfsio 8783 202059 0 0 3 0x14280 nfsidl nfsio 1230 461312 0 0 3 0x14280 nfsidl nfsio 5359 43625 0 0 3 0x14280 nfsidl nfsio 67694 494016 0 0 3 0x14280 nfsidl nfsio 52475 355605 0 0 3 0x14280 nfsidl nfsio 10523 28934 0 0 3 0x14280 nfsidl nfsio 62573 308170 0 0 3 0x14280 nfsidl nfsio 45583 444027 0 0 3 0x14200 bored sosplice 6359 222174 37942 0 3 0x82 nanoslp syz-executor 99143 172781 37942 0 3 0x82 nanoslp syz-executor 75488 223535 37942 0 3 0x82 nanoslp syz-executor 65338 429788 37942 0 3 0x82 nanoslp syz-executor 48659 373991 37942 0 3 0x82 nanoslp syz-executor 37942 183933 23273 0 2 0x2 syz-executor 23273 245843 63623 0 3 0x10008a sigsusp ksh 63623 58085 32261 0 3 0x98 kqread sshd-session 32261 176389 68455 0 3 0x92 kqread sshd-session 68455 450837 1 0 3 0x88 kqread sshd 60175 343162 91517 74 3 0x1100092 bpf pflogd 91517 509033 1 0 3 0x80 sbwait pflogd 53263 136200 33760 73 3 0x1100090 kqread syslogd 33760 201807 1 0 3 0x100082 sbwait syslogd 74930 171312 1 0 3 0x100080 kqread resolvd 11484 21344 92374 77 3 0x100092 kqread dhcpleased 21666 190492 92374 77 3 0x100092 kqread dhcpleased 92374 17719 1 0 3 0x80 kqread dhcpleased 8632 493960 0 0 3 0x14200 bored smr 30179 374637 0 0 2 0x14200 zerothread 65171 438869 0 0 3 0x14200 aiodoned aiodoned 56706 150905 0 0 3 0x14200 syncer update 71017 157490 0 0 3 0x14200 cleaner cleaner 28775 32748 0 0 3 0x14200 reaper reaper 26542 253800 0 0 3 0x14200 pgdaemon pagedaemon 44228 350489 0 0 3 0x14200 bored viomb 11902 260465 0 0 3 0x40014200 acpi0 acpi0 37648 355899 0 0 3 0x40014200 idle1 66356 213026 0 0 3 0x14200 bored softnet7 1163 207297 0 0 3 0x14200 bored softnet6 72227 461486 0 0 3 0x14200 bored softnet5 19321 466308 0 0 3 0x14200 bored softnet4 41513 82694 0 0 3 0x14200 bored softnet3 21043 176480 0 0 3 0x14200 bored softnet2 40867 306896 0 0 3 0x14200 bored softnet1 71373 66715 0 0 3 0x14200 bored softnet0 14919 200409 0 0 3 0x14200 bored systqmp 49746 379708 0 0 3 0x14200 bored systq 44581 149737 0 0 3 0x14200 tmoslp softclockmp 62161 210823 0 0 3 0x40014200 tmoslp softclock 43000 458821 0 0 3 0x40014200 idle0 1 21718 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10236 11041K 12552K 166960K 12898 0 pcb 19 12K 12K 166960K 221 0 rtable 161 6K 7K 166960K 480 0 pf 38 18K 24K 166960K 133 0 ifaddr 37 6K 8K 166960K 110 0 ifgroup 56 2K 2K 166960K 158 0 sysctl 4 1K 9K 166960K 13 0 counters 70 37K 37K 166960K 156 0 ioctlops 0 0K 8K 166960K 1643 0 iov 0 0K 16K 166960K 40 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1462 92K 92K 166960K 2236 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 22 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 965 0 sigio 0 0K 0K 166960K 14 0 proc 73 115K 180K 166960K 832 0 subproc 72 4K 4K 166960K 144 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 107 0 in_multi 76 5K 7K 166960K 210 0 ether_multi 1 0K 0K 166960K 5 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 654 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 235 151K 170K 166960K 9942 0 UVM aobj 21 4K 4K 166960K 22 0 pinsyscall 43 86K 105K 166960K 2261 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 59 0 NDP 12 0K 1K 166960K 72 0 temp 56 8646K 8910K 166960K 33909 0 kqueue 14 22K 30K 166960K 170 0 SYN cache 2 8K 16K 166960K 3 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 90 0 87 1 0 1 1 0 8 0 rtentry 176 183 0 117 5 0 5 5 0 8 0 unpcb 144 439 0 420 4 0 4 4 0 8 3 syncache 336 7 0 7 2 1 1 1 0 8 1 tcpqe 32 6 0 6 2 1 1 1 0 8 1 tcpcb 736 214 0 206 2 0 2 2 0 8 1 arp 128 20 0 12 1 0 1 1 0 8 0 inpcb 328 922 0 906 7 5 2 7 0 8 0 nd6 144 34 0 21 1 0 1 1 0 8 0 pkpcb 40 7 0 7 1 0 1 1 0 8 1 kcovpl 48 16 0 8 1 0 1 1 0 8 0 ppxss 1192 27 0 26 1 0 1 1 0 8 0 pppxif 1504 7 0 6 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 7 0 3 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 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pfstitem 24 57 0 8 1 0 1 1 0 8 0 pfstkey 128 61 0 12 2 0 2 2 0 8 0 pfstate 384 57 0 10 5 0 5 5 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 845 0 501 32 2 30 30 0 8 7 art_table 40 848 0 501 5 0 5 5 0 8 0 art_node 32 182 0 124 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 19 0 9 1 0 1 1 0 8 0 shmpl 112 19 0 1 1 0 1 1 0 8 0 dirhash 1024 28 0 11 3 0 3 3 0 8 0 dino2pl 256 2953 0 1433 96 0 96 96 0 8 0 ffsino 296 2953 0 1433 117 0 117 117 0 8 0 nchpl 144 4194 0 2474 64 0 64 64 0 8 0 rtmask 32 4 0 4 1 0 1 1 0 8 1 uvmvnodes 80 3601 0 0 74 0 74 74 0 8 0 vnodes 216 3601 0 0 201 0 201 201 0 8 0 namei 1024 15060 0 15060 3 1 2 2 0 8 2 percpumem 16 93 0 43 1 0 1 1 0 8 0 kstatmem 264 86 0 60 4 1 3 3 0 8 1 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 15544 0 15544 10 2 8 8 1 8 8 plimitpl 152 226 0 209 1 0 1 1 0 8 0 sigapl 424 1281 0 1206 9 0 9 9 0 8 0 knotepl 120 543 0 0 17 0 17 17 0 8 0 kqueuepl 224 254 0 242 2 0 2 2 0 8 1 pipepl 344 211 0 184 3 0 3 3 0 8 0 fdescpl 528 1235 0 1203 3 0 3 3 0 8 0 filepl 160 6680 0 6449 16 2 14 16 0 8 3 lockfpl 104 398 0 396 2 1 1 2 0 8 0 lockfspl 48 183 0 181 1 0 1 1 0 8 0 sessionpl 144 36 0 27 1 0 1 1 0 8 0 pgrppl 48 68 0 51 1 0 1 1 0 8 0 ucredpl 104 1144 0 1130 1 0 1 1 0 8 0 zombiepl 144 1209 0 1206 1 0 1 1 0 8 0 processpl 1248 1281 0 1206 6 0 6 6 0 8 0 procpl 664 2559 0 2477 9 0 9 9 0 8 0 sosppl 168 4 0 4 1 1 0 1 0 8 0 sockpl 752 1481 0 1443 13 2 11 11 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 103 0 0 13 0 13 13 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 14 0 0 1 0 1 1 0 8 0 mbufpl 256 1146 0 0 72 0 72 72 0 8 0 bufpl 280 5550 0 120 388 0 388 388 0 8 0 anonpl 32 6569 0 0 53 0 53 53 0 246 0 amapchunkpl 152 32680 0 32183 34 6 28 30 0 158 4 amappl16 200 2996 0 2961 13 2 11 11 0 8 6 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 138 0 125 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1994 0 1963 4 1 3 3 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 125 0 113 1 0 1 1 0 8 0 amappl6 120 253 0 250 1 0 1 1 0 8 0 amappl5 112 167 0 157 1 0 1 1 0 8 0 amappl4 104 331 0 310 1 0 1 1 0 8 0 amappl3 96 6428 0 6315 5 1 4 4 0 8 0 amappl2 88 781 0 719 2 0 2 2 0 8 0 amappl1 80 13043 0 12435 15 0 15 15 0 8 0 amappl 88 9007 0 8844 5 0 5 5 0 92 0 dma65536 65536 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 128 254 0 254 2 2 0 1 0 8 0 dma64 64 8 0 8 2 2 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 21 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1235 0 1203 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1235 0 1203 1 0 1 1 0 8 0 vmmpekpl 168 11549 0 11511 3 0 3 3 0 8 0 vmmpepl 168 83460 0 81418 99 3 96 96 0 357 2 vmsppl 488 1234 0 1203 5 0 5 5 0 8 0 rwobjpl 80 26985 0 22423 96 0 96 96 0 8 0 pdppl 4096 2478 0 2406 106 32 74 86 0 8 2 pvpl 32 14679 0 0 119 0 119 119 0 265 0 pmappl 256 1234 0 1203 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 347 0 38 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83783ff0) 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(ffffffff8391b270) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b270) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x77381ab89b90, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83783ff0) 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(ffffffff8391b270) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391b270) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x77381ab89b90, count: -7 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336c0d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af75e,ffffffff833bfb70,3b7,ffffffff833e956e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034c074e8,ffffffff83366341) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034c074e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c03b798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c51ae40) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80617ec890,83,fffffd80097fb680,ffff80003c03b798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7bc860,ffff80003c03b798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7bc860,ffff80003c03b798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c03b798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c03b798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c03b798,ffff80003c51b1b0,ffff80003c51b100) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c51b1a0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8336c0d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af75e,ffffffff833bfb70,3b7,ffffffff833e956e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034c074e8,ffffffff83366341) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034c074e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,83,2000,ffff80003c03b798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c51ae40) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80617ec890,83,fffffd80097fb680,ffff80003c03b798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7bc860,ffff80003c03b798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7bc860,ffff80003c03b798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7bc860,ffff80003c03b798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c03b798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c03b798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c03b798,ffff80003c51b1b0,ffff80003c51b100) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c51b1b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c51b1b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6fb9e221b770, count: -16