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 381724 79894 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337356e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af451,ffffffff833bed9b,3b7,ffffffff833e833e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037c274f8,ffffffff8336bc64) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800037c274f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2f1798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c520ed0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8075486638,1,fffffd80097fb4e0,ffff80002a2f1798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7cfb80,ffff80002a2f1798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7cfb80,ffff80002a2f1798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2f1798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2f1798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2f1798,ffff80003c521240,ffff80003c521190) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c521230, 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(ffffffff8337356e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af451,ffffffff833bed9b,3b7,ffffffff833e833e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037c274f8,ffffffff8336bc64) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800037c274f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2f1798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c520ed0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8075486638,1,fffffd80097fb4e0,ffff80002a2f1798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7cfb80,ffff80002a2f1798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7cfb80,ffff80002a2f1798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2f1798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2f1798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2f1798,ffff80003c521240,ffff80003c521190) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c521240) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c521240) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73642139b600, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c520ca0 rbx 0xffff8000299feddf rdx 0 rcx 0xffff80002a2f1798 rax 0xffff8000299fdff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xc1dbcb2084fea5dc r11 0x6048a4075ad6ab85 r12 0xffff8000299febe0 r13 0 r14 0 r15 0x1 rip 0xffffffff82973115 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c520c90 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=196068 pid=57184 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a2f1798 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a2f0aa0,0xffff80002a2f0fe0 process=0xffff8000388370e0 user=0xffff80003c51c000, vmspace=0xfffffd805d0af7c8 estcpu=36, cpticks=7, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79894 381724 47170 0 7 0 syz-executor 79894 73025 47170 0 3 0x4000080 kqread syz-executor 52324 490145 65060 0 2 0 syz-executor 52324 68297 65060 0 3 0x4000080 fsleep syz-executor 89319 175444 84652 0 2 0 syz-executor 89319 1510 84652 0 3 0x4000080 fsleep syz-executor 32611 446620 88893 0 2 0x100002 sh 26463 324182 72117 0 2 0 syz-executor 26463 203864 72117 0 3 0x4000000 smrbar syz-executor 26463 418753 72117 0 3 0x4000080 fsleep syz-executor 91359 132296 35387 0 2 0 syz-executor 91359 239714 35387 0 3 0x4000080 fsleep syz-executor 88893 519070 44888 0 3 0x82 wait syz-executor 51922 397788 44888 0 2 0x2 syz-executor 47170 419967 44888 0 3 0x82 nanoslp syz-executor 61647 495267 0 0 3 0x14200 acct acct 35387 307264 44888 0 2 0x3 syz-executor 19030 111839 0 0 3 0x14280 nfsidl nfsio 4306 53640 0 0 3 0x14280 nfsidl nfsio 94347 386489 0 0 3 0x14280 nfsidl nfsio 39982 385211 0 0 3 0x14280 nfsidl nfsio 51495 366041 0 0 3 0x14280 nfsidl nfsio 17548 146852 0 0 3 0x14280 nfsidl nfsio 57033 224742 0 0 3 0x14280 nfsidl nfsio 25701 394598 0 0 3 0x14280 nfsidl nfsio 73213 350190 0 0 3 0x14280 nfsidl nfsio 17633 21577 0 0 3 0x14280 nfsidl nfsio 68100 279347 0 0 3 0x14280 nfsidl nfsio 95816 345832 0 0 3 0x14280 nfsidl nfsio 25277 268800 0 0 3 0x14280 nfsidl nfsio 89512 417624 0 0 3 0x14280 nfsidl nfsio 17388 389655 0 0 3 0x14280 nfsidl nfsio 42744 99293 0 0 3 0x14280 nfsidl nfsio 9205 76754 0 0 3 0x14280 nfsidl nfsio 35 437614 0 0 3 0x14280 nfsidl nfsio 99209 498538 0 0 3 0x14280 nfsidl nfsio 90532 404628 0 0 3 0x14280 nfsidl nfsio 93455 247659 1 0 3 0x100083 ttyin getty 63194 301591 0 0 3 0x14200 bored sosplice 5480 22133 44888 0 3 0x82 nanoslp syz-executor 72117 497098 44888 0 3 0x82 nanoslp syz-executor 84652 218374 44888 0 3 0x82 nanoslp syz-executor 65060 493196 44888 0 3 0x82 nanoslp syz-executor 44888 459548 89222 0 2 0x3 syz-executor 89222 364909 43533 0 3 0x10008a sigsusp ksh 43533 91087 13914 0 3 0x98 kqread sshd-session 13914 417653 38864 0 3 0x92 kqread sshd-session 38864 503746 1 0 3 0x88 kqread sshd 67832 223979 37795 74 3 0x1100092 bpf pflogd 37795 169422 1 0 3 0x80 sbwait pflogd 89225 307470 34615 73 3 0x1100090 kqread syslogd 34615 72931 1 0 3 0x100082 sbwait syslogd 30768 519832 1 0 3 0x100080 kqread resolvd 55715 435758 8729 77 3 0x100092 kqread dhcpleased 78397 17195 8729 77 3 0x100092 kqread dhcpleased 8729 349694 1 0 3 0x80 kqread dhcpleased 34533 320162 0 0 3 0x14200 bored smr 49487 502576 0 0 2 0x14200 zerothread 88170 288686 0 0 3 0x14200 aiodoned aiodoned 96813 287992 0 0 3 0x14200 syncer update 58907 465166 0 0 3 0x14200 cleaner cleaner 48147 41267 0 0 3 0x14200 reaper reaper 44086 207950 0 0 3 0x14200 pgdaemon pagedaemon 65856 366737 0 0 3 0x14200 bored viomb 89557 514275 0 0 3 0x40014200 acpi0 acpi0 79151 254670 0 0 3 0x40014200 idle1 44772 100401 0 0 3 0x14200 bored softnet7 17750 273630 0 0 3 0x14200 bored softnet6 57255 280984 0 0 3 0x14200 bored softnet5 61482 440675 0 0 3 0x14200 bored softnet4 28777 1074 0 0 3 0x14200 bored softnet3 56417 126071 0 0 3 0x14200 bored softnet2 57765 245458 0 0 3 0x14200 bored softnet1 78400 404545 0 0 3 0x14200 bored softnet0 98839 103946 0 0 3 0x14200 bored systqmp 63023 56467 0 0 3 0x14200 bored systq 84441 316647 0 0 3 0x14200 tmoslp softclockmp 28161 219764 0 0 3 0x40014200 tmoslp softclock 35802 495562 0 0 3 0x40014200 idle0 1 75042 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 32611 (sh) thread 0xffff80002a2f02d8 (446620) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11115K 15268K 166960K 13273 0 pcb 17 13K 21K 166960K 302 0 rtable 196 8K 9K 166960K 456 0 pf 37 18K 67484K 166960K 142 0 ifaddr 43 7K 8K 166960K 105 0 ifgroup 60 2K 2K 166960K 171 0 sysctl 4 1K 9K 166960K 12 0 counters 72 37K 37K 166960K 254 0 ioctlops 0 0K 4K 166960K 1768 0 iov 0 0K 24K 166960K 166 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1533 96K 97K 166960K 2939 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 16K 20K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 52 0 dirhash 12 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 1288 0 sigio 1 0K 0K 166960K 32 0 proc 72 115K 180K 166960K 793 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 227 0 in_multi 88 6K 7K 166960K 177 0 ether_multi 1 0K 0K 166960K 9 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 181 811K 811K 166960K 181 0 exec 0 0K 1K 166960K 643 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 234 168K 182K 166960K 13221 0 UVM aobj 45 2K 2K 166960K 47 0 pinsyscall 43 86K 106K 166960K 2514 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 75 0 NDP 13 0K 2K 166960K 72 0 temp 75 8652K 8728K 166960K 51652 0 kqueue 17 28K 32K 166960K 250 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 120 405 0 402 7 6 1 3 0 8 0 rtentry 176 163 0 82 5 0 5 5 0 8 0 unpcb 144 826 0 806 8 7 1 4 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 414 0 408 7 6 1 7 0 8 0 arp 128 23 0 11 1 0 1 1 0 8 0 inpcb 328 1418 0 1408 16 13 3 8 0 8 1 nd6 144 26 0 11 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 2 0 1 0 8 0 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 5 0 5 3 3 0 1 0 8 0 ppxss 1192 77 0 76 2 1 1 1 0 8 0 pppxif 1504 6 0 5 3 2 1 1 0 8 0 pffrag 232 6 0 3 1 0 1 1 0 482 0 pffrnode 88 4 0 2 1 0 1 1 0 8 0 pffrent 40 10 0 7 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 1 0 1 1 1 0 1 0 8 0 pfstitem 24 74 0 27 1 0 1 1 0 8 0 pfstkey 128 74 0 27 2 0 2 2 0 8 0 pfstate 384 74 0 27 6 0 6 6 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 732 0 355 33 8 25 32 0 8 0 art_table 40 734 0 355 6 0 6 6 0 8 0 art_node 32 161 0 96 1 0 1 1 0 8 0 semapl 112 49 0 39 1 0 1 1 0 8 0 shmpl 112 44 0 2 2 0 2 2 0 8 0 dirhash 1024 26 0 9 3 0 3 3 0 8 0 dino2pl 256 3832 0 2314 96 0 96 96 0 8 0 ffsino 296 3832 0 2314 118 0 118 118 0 8 0 nchpl 144 5575 0 3870 64 0 64 64 0 8 0 rtmask 32 10 0 10 1 1 0 1 0 8 0 uvmvnodes 80 4884 0 0 100 0 100 100 0 8 0 vnodes 216 4884 0 0 272 0 272 272 0 8 0 namei 1024 20180 0 20179 3 2 1 2 0 8 0 percpumem 16 142 0 91 1 0 1 1 0 8 0 kstatmem 264 98 0 70 2 0 2 2 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 4 0 4 3 3 0 1 0 8 0 scxspl 216 32422 0 32422 12 11 1 8 1 8 1 plimitpl 152 376 0 359 1 0 1 1 0 8 0 sigapl 424 1613 0 1537 9 0 9 9 0 8 0 knotepl 120 521 0 0 16 0 16 16 0 8 0 kqueuepl 224 495 0 480 9 7 2 5 0 8 0 pipepl 344 319 0 291 9 6 3 9 0 8 0 fdescpl 528 1568 0 1536 3 0 3 3 0 8 0 filepl 160 11306 0 11081 23 10 13 16 0 8 1 lockfpl 104 590 0 588 1 0 1 1 0 8 0 lockfspl 48 217 0 215 1 0 1 1 0 8 0 sessionpl 144 28 0 19 1 0 1 1 0 8 0 pgrppl 48 63 0 46 1 0 1 1 0 8 0 ucredpl 104 1987 0 1973 1 0 1 1 0 8 0 zombiepl 144 1776 0 1775 1 0 1 1 0 8 0 processpl 1248 1613 0 1537 6 0 6 6 0 8 0 procpl 664 3597 0 3515 9 0 9 9 0 8 0 sosppl 168 14 0 13 3 2 1 1 0 8 0 sockpl 752 2713 0 2680 28 22 6 15 0 8 2 mcl64k 65536 16 0 0 2 0 2 2 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 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 83 0 0 3 0 3 3 0 8 0 mbufpl 256 1975 0 0 123 0 123 123 0 8 0 bufpl 280 13959 0 7815 440 0 440 440 0 8 0 anonpl 32 10727 0 0 87 0 87 87 0 246 0 amapchunkpl 152 44174 0 43701 44 14 30 30 0 158 6 amappl16 200 5616 0 5586 46 38 8 23 0 8 1 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 130 0 118 1 0 1 1 0 8 0 amappl13 176 4 0 4 2 2 0 1 0 8 0 amappl12 168 2296 0 2264 3 1 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 6 0 4 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 36 0 33 1 0 1 1 0 8 0 amappl7 128 141 0 128 1 0 1 1 0 8 0 amappl6 120 225 0 220 1 0 1 1 0 8 0 amappl5 112 158 0 148 1 0 1 1 0 8 0 amappl4 104 313 0 293 1 0 1 1 0 8 0 amappl3 96 8937 0 8829 5 1 4 4 0 8 0 amappl2 88 713 0 647 2 0 2 2 0 8 0 amappl1 80 13247 0 12651 15 2 13 15 0 8 0 amappl 88 12229 0 12070 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 7 0 7 2 2 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 46 0 2 1 0 1 1 0 8 0 uaddrrnd 24 1567 0 1536 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1567 0 1536 1 0 1 1 0 8 0 vmmpekpl 168 14088 0 14039 3 0 3 3 0 8 0 vmmpepl 168 104536 0 102574 121 25 96 108 0 357 1 vmsppl 488 1567 0 1536 6 1 5 5 0 8 0 rwobjpl 80 33711 0 27843 120 0 120 120 0 8 0 pdppl 4096 3142 0 3072 112 38 74 86 0 8 4 pvpl 32 20351 0 0 164 0 164 164 0 265 0 pmappl 256 1567 0 1536 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 414 0 62 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83785ff0) 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(ffffffff83889598) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83889598) 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: 0x76fb6d0d1430, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83785ff0) 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(ffffffff83889598) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83889598) 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: 0x76fb6d0d1430, 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(ffffffff8337356e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af451,ffffffff833bed9b,3b7,ffffffff833e833e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037c274f8,ffffffff8336bc64) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800037c274f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2f1798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c520ed0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8075486638,1,fffffd80097fb4e0,ffff80002a2f1798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7cfb80,ffff80002a2f1798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7cfb80,ffff80002a2f1798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2f1798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2f1798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2f1798,ffff80003c521240,ffff80003c521190) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c521230, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8337356e) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833af451,ffffffff833bed9b,3b7,ffffffff833e833e) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800037c274f8,ffffffff8336bc64) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800037c274f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80002a2f1798) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c520ed0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8075486638,1,fffffd80097fb4e0,ffff80002a2f1798) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7cfb80,ffff80002a2f1798) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7cfb80,ffff80002a2f1798) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7cfb80,ffff80002a2f1798) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a2f1798) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a2f1798,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a2f1798,ffff80003c521240,ffff80003c521190) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c521240) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c521240) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73642139b600, count: -16