panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 953 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 415543 72532 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83390337) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d1747,ffffffff833e1a9d,3b9,ffffffff8340b65d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff833868b5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(0,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c50b260) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000337e2280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c0d78d0,41,fffffd80097fb0d0,ffff80003c50b260) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80674771c0,ffff80003c50b260) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80674771c0,ffff80003c50b260) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c50b260) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c50b260,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c50b260,ffff8000337e25f0,ffff8000337e2540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff8000337e25e0, 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 953 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83390337) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d1747,ffffffff833e1a9d,3b9,ffffffff8340b65d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff833868b5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(0,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c50b260) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000337e2280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c0d78d0,41,fffffd80097fb0d0,ffff80003c50b260) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80674771c0,ffff80003c50b260) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80674771c0,ffff80003c50b260) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c50b260) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c50b260,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c50b260,ffff8000337e25f0,ffff8000337e2540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000337e25f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000337e25f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c75cb8a4f70, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000337e2050 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff80003c50b260 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x4a21c08fe9c59c42 r11 0xedb296f1e7c620b7 r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff8277cb75 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000337e2040 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=487044 pid=88779 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=80, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c50b260 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c50b4f8,0xffff80003c50bcd0 process=0xffff80003c4ace98 user=0xffff8000337dd000, vmspace=0xfffffd806c1ef3e8 estcpu=30, cpticks=4, pctcpu=0.2, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 76740 240313 16276 0 2 0 syz-executor 76740 294334 16276 0 3 0x4000080 fsleep syz-executor 57049 318135 31990 0 2 0 syz-executor 57049 87623 31990 0 3 0x4000080 fsleep syz-executor 40692 308516 29059 0 2 0 syz-executor 40692 203330 29059 0 2 0x4000000 syz-executor 40692 337306 29059 0 3 0x4000080 fsleep syz-executor 72532 415543 71072 0 7 0 syz-executor 72532 428469 71072 0 3 0x4000080 ttyin syz-executor 72532 264121 71072 0 2 0x4000080 syz-executor 45232 142565 0 0 3 0x14200 acct acct 78223 463435 0 0 3 0x14280 nfsidl nfsio 30349 159035 0 0 3 0x14280 nfsidl nfsio 8248 34523 0 0 3 0x14280 nfsidl nfsio 71871 167933 0 0 3 0x14280 nfsidl nfsio 89932 231344 0 0 3 0x14280 nfsidl nfsio 73571 241560 0 0 3 0x14280 nfsidl nfsio 92933 37684 0 0 3 0x14280 nfsidl nfsio 59021 195661 0 0 3 0x14280 nfsidl nfsio 63745 82159 0 0 3 0x14280 nfsidl nfsio 13481 280106 0 0 3 0x14280 nfsidl nfsio 91290 506704 0 0 3 0x14280 nfsidl nfsio 42818 185949 0 0 3 0x14280 nfsidl nfsio 24912 29120 0 0 3 0x14280 nfsidl nfsio 38668 398672 0 0 3 0x14280 nfsidl nfsio 20366 45919 0 0 3 0x14280 nfsidl nfsio 49249 326127 0 0 3 0x14280 nfsidl nfsio 82817 392257 0 0 3 0x14280 nfsidl nfsio 67295 128296 0 0 3 0x14280 nfsidl nfsio 2750 256035 0 0 3 0x14280 nfsidl nfsio 35548 34889 0 0 3 0x14280 nfsidl nfsio 74087 160535 71630 0 3 0x100082 sbwait arp 71630 460284 67293 0 3 0x10008a sigsusp sh 31990 385372 68652 0 3 0x82 nanoslp syz-executor 67293 235729 68652 0 3 0x82 wait syz-executor 29059 492091 68652 0 3 0x82 nanoslp syz-executor 71072 198300 68652 0 3 0x82 nanoslp syz-executor 9577 385063 68652 0 3 0x82 wait syz-executor 77974 117568 68652 0 3 0x82 nanoslp syz-executor 61281 179915 68652 0 3 0x82 nanoslp syz-executor 16276 274790 68652 0 3 0x82 nanoslp syz-executor 68652 270999 56062 0 3 0x82 kqread syz-executor 56062 271136 61456 0 3 0x10008a sigsusp ksh 61456 307674 45940 0 3 0x98 kqread sshd-session 45940 756 63546 0 3 0x92 kqread sshd-session 42196 211439 1 0 3 0x100083 ttyin getty 63546 291475 1 0 3 0x88 kqread sshd 60914 285436 74284 74 3 0x1100092 bpf pflogd 74284 189006 1 0 3 0x80 sbwait pflogd 7552 377150 45212 73 3 0x1100090 kqread syslogd 45212 356377 1 0 3 0x100082 sbwait syslogd 43779 379133 1 0 3 0x100080 kqread resolvd 34905 226063 86572 77 2 0x100012 dhcpleased 46701 402005 86572 77 3 0x100092 kqread dhcpleased 86572 513037 1 0 3 0x80 kqread dhcpleased 68653 314968 0 0 3 0x14200 bored smr 15072 326471 0 0 2 0x14200 zerothread 24517 374382 0 0 3 0x14200 aiodoned aiodoned 98678 234579 0 0 3 0x14200 syncer update 33987 429461 0 0 3 0x14200 cleaner cleaner 45639 337696 0 0 3 0x14200 reaper reaper 60328 426740 0 0 3 0x14200 pgdaemon pagedaemon 91825 148652 0 0 3 0x14200 bored viomb 44760 111529 0 0 3 0x40014200 acpi0 acpi0 27323 518991 0 0 3 0x40014200 idle1 76950 305528 0 0 3 0x14200 bored softnet1 20704 427373 0 0 3 0x14200 bored softnet0 90329 28708 0 0 3 0x14200 smrbar systqmp 81607 384193 0 0 3 0x14200 bored systq 93736 265020 0 0 3 0x14200 tmoslp softclockmp 63668 94867 0 0 3 0x40014200 tmoslp softclock 41033 186439 0 0 3 0x40014200 idle0 1 125431 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 90329 (systqmp) thread 0xffff8000ffffe298 (28708) shared rwlock systqmp r = 0 (0xffffffff83875f58) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 11031K 11358K 166960K 11720 0 pcb 17 15K 17K 166960K 127 0 rtable 202 7K 8K 166960K 397 0 pf 36 17K 67485K 166960K 88 0 ifaddr 37 6K 7K 166960K 68 0 ifgroup 57 2K 2K 166960K 112 0 sysctl 4 1K 9K 166960K 9 0 counters 72 37K 38K 166960K 126 0 ioctlops 0 0K 4K 166960K 1522 0 iov 0 0K 16K 166960K 18 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1414 89K 89K 166960K 1622 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 15 0 dirhash 15 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 114K 166960K 424 0 sigio 0 0K 0K 166960K 2 0 proc 72 115K 180K 166960K 559 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 159 0 in_multi 67 5K 6K 166960K 102 0 ether_multi 1 0K 0K 166960K 3 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 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 400 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 269 179K 184K 166960K 5783 0 UVM aobj 10 2K 2K 166960K 11 0 pinsyscall 45 90K 108K 166960K 1537 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 33 0 NDP 13 0K 1K 166960K 44 0 temp 40 8651K 8716K 166960K 21587 0 kqueue 14 22K 32K 166960K 85 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 67 0 62 1 0 1 1 0 8 0 rtentry 176 113 0 29 5 0 5 5 0 8 0 unpcb 144 304 0 285 6 2 4 6 0 8 3 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpcb 736 155 0 150 7 0 7 7 0 8 6 arp 136 18 0 4 1 0 1 1 0 8 0 inpcb 328 606 0 598 12 3 9 12 0 8 8 nd6 152 22 0 6 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 22 0 20 1 0 1 1 0 8 0 pppxif 1504 6 0 5 1 0 1 1 0 8 0 pffrag 232 8 0 4 1 0 1 1 0 482 0 pffrnode 88 8 0 4 1 0 1 1 0 8 0 pffrent 40 14 0 10 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 pfstitem 24 41 0 1 1 0 1 1 0 8 0 pfstkey 128 41 0 1 2 0 2 2 0 8 0 pfstate 384 41 0 1 4 0 4 4 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 461 0 131 28 0 28 28 0 8 2 art_table 40 463 0 131 5 0 5 5 0 8 0 art_node 32 112 0 36 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 25 0 6 3 0 3 3 0 8 0 dino2pl 256 2104 0 589 95 0 95 95 0 8 0 ffsino 296 2104 0 589 117 0 117 117 0 8 0 nchpl 144 2719 0 1020 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 1 0 1 0 8 0 vnodes 216 2352 0 0 131 0 131 131 0 8 0 namei 1024 8955 0 8955 1 0 1 1 0 8 1 percpumem 16 78 0 27 1 0 1 1 0 8 0 kstatmem 264 64 0 34 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 12019 0 12019 9 3 6 8 1 8 6 plimitpl 152 72 0 54 1 0 1 1 0 8 0 sigapl 424 747 0 677 8 0 8 8 0 8 0 knotepl 120 533 0 0 17 0 17 17 0 8 0 kqueuepl 224 161 0 150 3 2 1 3 0 8 0 pipepl 344 138 0 111 3 0 3 3 0 8 0 fdescpl 528 710 0 677 3 0 3 3 0 8 0 filepl 160 4065 0 3838 18 0 18 18 0 8 7 lockfpl 104 248 0 245 2 0 2 2 0 8 1 lockfspl 48 114 0 111 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 97 0 80 1 0 1 1 0 8 0 ucredpl 104 362 0 349 1 0 1 1 0 8 0 zombiepl 144 680 0 677 1 0 1 1 0 8 0 processpl 1232 747 0 677 6 0 6 6 0 8 0 procpl 664 1238 0 1162 8 0 8 8 0 8 0 sosppl 176 5 0 5 1 0 1 1 0 8 1 sockpl 752 988 0 956 21 9 12 17 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 30 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1164 0 0 73 0 73 73 0 8 0 bufpl 280 4384 0 130 304 0 304 304 0 8 0 anonpl 32 8186 0 0 67 0 67 67 0 246 0 amapchunkpl 152 19152 0 18472 31 0 31 31 0 158 2 amappl16 200 2713 0 2647 15 4 11 14 0 8 5 amappl15 192 7 0 7 2 1 1 1 0 8 1 amappl14 184 2 0 2 1 1 0 1 0 8 0 amappl13 176 422 0 420 1 0 1 1 0 8 0 amappl12 168 1070 0 1025 3 0 3 3 0 8 0 amappl11 160 32 0 32 1 1 0 1 0 8 0 amappl10 152 48 0 34 1 0 1 1 0 8 0 amappl9 144 264 0 262 1 0 1 1 0 8 0 amappl8 136 27 0 24 1 0 1 1 0 8 0 amappl7 128 91 0 89 1 0 1 1 0 8 0 amappl6 120 285 0 269 1 0 1 1 0 8 0 amappl5 112 78 0 68 1 0 1 1 0 8 0 amappl4 104 419 0 385 2 1 1 2 0 8 0 amappl3 96 2970 0 2868 4 1 3 3 0 8 0 amappl2 88 834 0 753 2 0 2 2 0 8 0 amappl1 80 10499 0 9869 15 1 14 15 0 8 0 amappl 88 5005 0 4820 5 0 5 5 0 92 0 uvmvnodes 80 2352 0 0 48 0 48 48 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 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 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 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 710 0 677 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 710 0 677 1 0 1 1 0 8 0 vmmpekpl 168 7508 0 7474 2 0 2 2 0 8 0 vmmpepl 168 52826 0 50752 99 0 99 99 0 357 6 vmsppl 488 709 0 677 5 0 5 5 0 8 0 rwobjpl 80 19657 0 16251 70 0 70 70 0 8 0 pdppl 4096 1428 0 1354 100 26 74 86 0 8 0 pvpl 32 16238 0 0 131 0 131 131 0 265 0 pmappl 256 709 0 677 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 337 0 29 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837a7ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83955060) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83955060) at __mp_lock+0x1a3 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: 0x7e1ef22540d0, count: 7 ddb{0}> trace x86_ipi_db(ffffffff837a7ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83955060) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83955060) at __mp_lock+0x1a3 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: 0x7e1ef22540d0, count: -8 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(ffffffff83390337) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d1747,ffffffff833e1a9d,3b9,ffffffff8340b65d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff833868b5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(0,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c50b260) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000337e2280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c0d78d0,41,fffffd80097fb0d0,ffff80003c50b260) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80674771c0,ffff80003c50b260) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80674771c0,ffff80003c50b260) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c50b260) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c50b260,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c50b260,ffff8000337e25f0,ffff8000337e2540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff8000337e25e0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83390337) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d1747,ffffffff833e1a9d,3b9,ffffffff8340b65d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44f4e8,ffffffff833868b5) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(0,ffff80003c44f4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c50b260) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000337e2280) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c0d78d0,41,fffffd80097fb0d0,ffff80003c50b260) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80674771c0,ffff80003c50b260) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80674771c0,ffff80003c50b260) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80674771c0,ffff80003c50b260) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c50b260) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c50b260,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c50b260,ffff8000337e25f0,ffff8000337e2540) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff8000337e25f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000337e25f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c75cb8a4f70, count: -16