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 485921 27741 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345c5ec) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340cc98,ffffffff834113cd,3e3,ffffffff83411415) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3474f8,ffffffff8335801f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(205b9a,ffff80002a3474f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000ffff0a68) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ec50cc0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b44f370,1,fffffd807f7d3618,ffff8000ffff0a68) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069ed5d60,ffff8000ffff0a68) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8069ed5d60,ffff8000ffff0a68) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0a68) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0a68,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff0a68,ffff80002ec51030,ffff80002ec50f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002ec51020, 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 995 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345c5ec) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340cc98,ffffffff834113cd,3e3,ffffffff83411415) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3474f8,ffffffff8335801f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(205b9a,ffff80002a3474f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000ffff0a68) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ec50cc0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b44f370,1,fffffd807f7d3618,ffff8000ffff0a68) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069ed5d60,ffff8000ffff0a68) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8069ed5d60,ffff8000ffff0a68) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0a68) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0a68,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff0a68,ffff80002ec51030,ffff80002ec50f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ec51030) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ec51030) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71406e125140, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002ec50a90 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff8000ffff0a68 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x11fbef1dec0fac0b r11 0xc3c71346309ef6b0 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff82ce4ad5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ec50a80 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=346152 pid=1337 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000ffff0a68 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a31fc68,0xffff80002a31e568 process=0xffff8000fffeaa98 user=0xffff80002ec4c000, vmspace=0xfffffd807eb8c960 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27741 485921 81572 0 7 0 syz-executor 27741 358185 81572 0 2 0x4000000 syz-executor 54805 217196 89410 0 2 0 syz-executor 54805 426455 89410 0 3 0x4000000 smrbar syz-executor 54805 143081 89410 0 3 0x4000080 fsleep syz-executor 54805 290374 89410 0 3 0x4000080 fsleep syz-executor 34835 279380 15241 0 2 0x1082000 syz-executor 34835 376301 15241 0 4 0x5082000 syz-executor 34835 234717 15241 0 3 0x5002000 suspend syz-executor 34835 482993 15241 0 4 0x5082000 syz-executor 52123 514954 94826 0 3 0x80 nanoslp syz-executor 52123 299288 94826 0 3 0x4000080 sbwait syz-executor 52123 424104 94826 0 3 0x4000080 fsleep syz-executor 52123 522437 94826 0 3 0x4000080 fsleep syz-executor 1499 390050 1 0 3 0x100083 ttyin getty 82750 302434 38321 0 3 0x82 nanoslp syz-executor 7729 152116 0 0 3 0x14280 nfsidl nfsio 87348 423610 0 0 3 0x14280 nfsidl nfsio 9886 106303 0 0 3 0x14280 nfsidl nfsio 61350 153599 0 0 3 0x14280 nfsidl nfsio 26520 144536 0 0 3 0x14280 nfsidl nfsio 80576 385643 0 0 3 0x14280 nfsidl nfsio 71213 328173 0 0 3 0x14280 nfsidl nfsio 70708 23547 0 0 3 0x14280 nfsidl nfsio 26555 460450 0 0 3 0x14280 nfsidl nfsio 36126 420046 0 0 3 0x14280 nfsidl nfsio 22307 441187 0 0 3 0x14280 nfsidl nfsio 304 287518 0 0 3 0x14280 nfsidl nfsio 18719 334605 0 0 3 0x14280 nfsidl nfsio 49451 509682 0 0 3 0x14280 nfsidl nfsio 33305 163476 0 0 3 0x14280 nfsidl nfsio 27166 20928 0 0 3 0x14280 nfsidl nfsio 76214 189160 0 0 3 0x14280 nfsidl nfsio 87597 490110 0 0 3 0x14280 nfsidl nfsio 5697 128122 0 0 3 0x14280 nfsidl nfsio 35183 142350 0 0 3 0x14280 nfsidl nfsio 93876 210396 38321 0 3 0x82 wait syz-executor 9401 275685 38321 0 3 0x82 nanoslp syz-executor 23636 82680 0 0 3 0x14200 bored sosplice 81572 272727 38321 0 3 0x82 nanoslp syz-executor 89410 93448 38321 0 3 0x82 nanoslp syz-executor 16284 482444 38321 0 3 0x2 biowait syz-executor 15241 294192 38321 0 3 0x82 nanoslp syz-executor 94826 172910 38321 0 3 0x82 nanoslp syz-executor 38321 258473 23588 0 3 0x82 kqread syz-executor 23588 362529 99815 0 3 0x10008a sigsusp ksh 99815 315835 94443 0 3 0x98 kqread sshd-session 94443 385663 98370 0 3 0x92 kqread sshd-session 98370 298762 1 0 3 0x88 kqread sshd 29740 398437 4969 74 3 0x1100092 bpf pflogd 4969 461191 1 0 3 0x80 sbwait pflogd 35891 177727 70095 73 3 0x1100090 kqread syslogd 70095 100007 1 0 3 0x100082 sbwait syslogd 68832 488519 1 0 3 0x100080 kqread resolvd 45389 462933 42490 77 3 0x100092 kqread dhcpleased 51525 42845 42490 77 3 0x100092 kqread dhcpleased 42490 385088 1 0 3 0x80 kqread dhcpleased 79356 316260 0 0 3 0x14200 bored smr 24469 401810 0 0 2 0x14200 zerothread 94650 341474 0 0 3 0x14200 aiodoned aiodoned 51669 298894 0 0 3 0x14200 syncer update 49423 127385 0 0 3 0x14200 cleaner cleaner 13764 343340 0 0 2 0x14200 reaper 59618 439647 0 0 3 0x14200 pgdaemon pagedaemon 24277 161781 0 0 3 0x14200 bored viomb 31442 198433 0 0 3 0x40014200 acpi0 acpi0 66125 171862 0 0 3 0x40014200 idle1 45290 382555 0 0 3 0x14200 bored softnet3 34074 232738 0 0 3 0x14200 bored softnet2 99308 131628 0 0 3 0x14200 bored softnet1 98622 105113 0 0 3 0x14200 bored softnet0 86548 2247 0 0 3 0x14200 bored systqmp 29438 175247 0 0 3 0x14200 bored systq 56636 16399 0 0 3 0x14200 tmoslp softclockmp 61387 452357 0 0 3 0x40014200 tmoslp softclock 87648 409137 0 0 3 0x40014200 idle0 1 9135 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 27741 (syz-executor) thread 0xffff80002a32a040 (358185) Process 16284 (syz-executor) thread 0xffff80002a281210 (482444) Process 13764 (reaper) thread 0xffff8000ffffd488 (343340) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10221 11110K 11479K 166960K 12932 0 pcb 17 12K 12K 166960K 170 0 rtable 164 8K 10K 166960K 564 0 pf 38 18K 21K 166960K 128 0 ifaddr 34 5K 7K 166960K 100 0 ifgroup 61 2K 2K 166960K 162 0 sysctl 4 1K 9K 166960K 11 0 counters 70 37K 37K 166960K 174 0 ioctlops 0 0K 4K 166960K 1624 0 iov 0 0K 16K 166960K 55 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1408 89K 89K 166960K 2435 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 3K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 93K 166960K 1057 0 sigio 0 0K 0K 166960K 8 0 proc 72 91K 140K 166960K 722 0 subproc 72 4K 4K 166960K 99 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 287 0 in_multi 60 4K 7K 166960K 161 0 ether_multi 1 0K 0K 166960K 4 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 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 539 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 250 160K 178K 166960K 11515 0 UVM aobj 65 3K 4K 166960K 72 0 pinsyscall 42 84K 106K 166960K 2291 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 47 0 NDP 13 0K 2K 166960K 67 0 temp 71 8682K 8758K 166960K 42340 0 kqueue 15 24K 28K 166960K 195 0 SYN cache 2 16K 16K 166960K 2 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 120 121 0 117 1 0 1 1 0 8 0 rtentry 176 175 0 109 6 0 6 6 0 8 0 unpcb 144 966 0 931 11 5 6 6 0 8 4 syncache 336 11 0 11 2 2 0 1 0 8 0 tcpcb 808 343 0 339 12 11 1 9 0 8 0 arp 128 30 0 16 1 0 1 1 0 8 0 inpcb 384 957 0 947 11 9 2 8 0 8 1 nd6 144 39 0 25 1 0 1 1 0 8 0 pkpcb 40 9 0 9 3 2 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 38 0 37 3 2 1 1 0 8 0 pppxif 1504 9 0 8 3 2 1 1 0 8 0 pffrag 232 10 0 2 1 0 1 1 0 482 0 pffrnode 88 10 0 2 1 0 1 1 0 8 0 pffrent 40 20 0 12 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 69 0 26 1 0 1 1 0 8 0 pfstkey 128 69 0 26 2 0 2 2 0 8 0 pfstate 384 69 0 26 6 0 6 6 0 8 0 pfrule 1344 23 0 16 2 1 1 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 256 765 0 479 30 8 22 29 0 8 0 art_table 32 766 0 479 4 0 4 4 0 8 0 art_node 16 173 0 114 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 6 1 0 1 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 69 0 7 2 0 2 2 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3361 0 1845 95 0 95 95 0 8 0 ffsino 288 3361 0 1845 109 0 109 109 0 8 0 nchpl 144 4791 0 3086 64 0 64 64 0 8 0 rtmask 32 9 0 9 2 2 0 1 0 8 0 uvmvnodes 80 4034 0 0 83 0 83 83 0 8 0 vnodes 216 4034 0 0 225 0 225 225 0 8 0 namei 1024 16445 0 16444 4 2 2 2 0 8 1 percpumem 16 102 0 52 1 0 1 1 0 8 0 kstatmem 264 92 0 62 3 0 3 3 0 8 0 scsiplug 72 4 0 4 2 2 0 1 0 8 0 scxspl 216 13937 0 13936 12 11 1 8 1 8 0 plimitpl 152 137 0 120 1 0 1 1 0 8 0 sigapl 424 1391 0 1321 11 2 9 9 0 8 0 knotepl 120 569 0 0 18 0 18 18 0 8 0 kqueuepl 224 364 0 352 5 4 1 3 0 8 0 pipepl 336 305 0 278 8 5 3 8 0 8 0 fdescpl 520 1350 0 1319 3 0 3 3 0 8 0 filepl 160 8725 0 8483 25 7 18 18 0 8 5 lockfpl 104 309 0 307 1 0 1 1 0 8 0 lockfspl 48 132 0 130 1 0 1 1 0 8 0 sessionpl 144 35 0 26 1 0 1 1 0 8 0 pgrppl 48 61 0 44 1 0 1 1 0 8 0 ucredpl 104 1460 0 1445 1 0 1 1 0 8 0 zombiepl 144 1403 0 1400 1 0 1 1 0 8 0 processpl 1208 1391 0 1321 6 0 6 6 0 8 0 procpl 656 2909 0 2828 9 1 8 8 0 8 0 srpgc 96 12 0 12 2 2 0 1 0 8 0 sosppl 168 10 0 10 2 2 0 1 0 8 0 sockpl 728 2099 0 2051 31 20 11 19 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 104 0 0 3 0 3 3 0 8 0 mbufpl 256 271 0 0 17 0 17 17 0 8 0 bufpl 280 4035 0 134 279 0 279 279 0 8 0 anonpl 32 8033 0 0 65 0 65 65 0 246 0 amapchunkpl 152 37167 0 36639 42 11 31 31 0 158 7 amappl16 200 3358 0 3326 29 17 12 15 0 8 8 amappl15 192 10 0 10 2 2 0 1 0 8 0 amappl14 184 138 0 126 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 2081 0 2050 4 1 3 3 0 8 0 amappl11 160 63 0 49 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 244 0 244 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 143 0 131 1 0 1 1 0 8 0 amappl6 120 224 0 219 1 0 1 1 0 8 0 amappl5 112 139 0 129 1 0 1 1 0 8 0 amappl4 104 365 0 345 1 0 1 1 0 8 0 amappl3 96 7373 0 7261 4 0 4 4 0 8 0 amappl2 88 769 0 705 2 0 2 2 0 8 0 amappl1 80 14037 0 13429 15 0 15 15 0 8 0 amappl 88 10537 0 10360 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 2 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 71 0 7 2 0 2 2 0 8 0 uaddrrnd 24 1350 0 1319 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1350 0 1319 1 0 1 1 0 8 0 vmmpekpl 168 12745 0 12684 3 0 3 3 0 8 0 vmmpepl 168 90624 0 88617 108 11 97 100 0 357 5 vmsppl 480 1349 0 1319 5 0 5 5 0 8 0 rwobjpl 72 29568 0 24525 95 1 94 94 0 8 1 pdppl 4096 2708 0 2638 116 44 72 86 0 8 2 pvpl 32 17853 0 0 144 0 144 144 0 265 0 pmappl 256 1349 0 1319 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 425 0 74 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838b8ff0) 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(ffffffff838c5ba8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838c5ba8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a26c240,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7ac4aaf9e3c0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff838b8ff0) 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(ffffffff838c5ba8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838c5ba8) at __mp_lock+0x192 sys/kern/kern_lock.c:144 intr_handler(ffff80002a26c240,ffff800000079f00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7ac4aaf9e3c0, count: -6 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(ffffffff8345c5ec) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340cc98,ffffffff834113cd,3e3,ffffffff83411415) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3474f8,ffffffff8335801f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(205b9a,ffff80002a3474f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000ffff0a68) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ec50cc0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b44f370,1,fffffd807f7d3618,ffff8000ffff0a68) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069ed5d60,ffff8000ffff0a68) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8069ed5d60,ffff8000ffff0a68) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0a68) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0a68,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff0a68,ffff80002ec51030,ffff80002ec50f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002ec51020, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345c5ec) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340cc98,ffffffff834113cd,3e3,ffffffff83411415) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3474f8,ffffffff8335801f) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(205b9a,ffff80002a3474f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff8000ffff0a68) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ec50cc0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805b44f370,1,fffffd807f7d3618,ffff8000ffff0a68) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8069ed5d60,ffff8000ffff0a68) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8069ed5d60,ffff8000ffff0a68) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8069ed5d60,ffff8000ffff0a68) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000ffff0a68) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000ffff0a68,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff8000ffff0a68,ffff80002ec51030,ffff80002ec50f80) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ec51030) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ec51030) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x71406e125140, count: -16