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 505380 60170 0 0 0 0 syz-executor * 64872 48866 0 0 0x4000000 1K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b9fed) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9df4,ffffffff8350b526,3bb,ffffffff8353441c) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c45ded0,ffffffff834ae198) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff800035798000,ffff80003c45dec8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800035797a20) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4655a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006b8772d8,1,fffffc00097fd208,ffff800035797a20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006be37ce0,ffff800035797a20) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006be37ce0,ffff800035797a20) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff800035797a20,ffff80003c465870,ffff80003c4657c0) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c465870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c465870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10d6dc8d640, count: 1 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 955 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b9fed) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9df4,ffffffff8350b526,3bb,ffffffff8353441c) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c45ded0,ffffffff834ae198) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff800035798000,ffff80003c45dec8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800035797a20) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4655a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006b8772d8,1,fffffc00097fd208,ffff800035797a20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006be37ce0,ffff800035797a20) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006be37ce0,ffff800035797a20) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff800035797a20,ffff80003c465870,ffff80003c4657c0) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c465870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c465870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10d6dc8d640, count: -14 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c465370 rbx 0xffff80002999ee07 rdx 0xffff8000015f9700 rcx 0xffff800035797a20 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x42b24a75de47eb9f r11 0x48706db91368ba9f r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff82755595 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c465360 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=64872 pid=48866 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800035796d28,0xffff800035796808 process=0xffff80002ff8b518 user=0xffff80003c460000, vmspace=0xfffffc006f383b78 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60170 505380 89721 0 7 0 syz-executor 60170 434332 89721 0 2 0x4000000 syz-executor 48866 284644 83837 0 2 0 syz-executor *48866 64872 83837 0 7 0x4000000 syz-executor 5233 63590 88186 0 2 0 syz-executor 5233 90876 88186 0 3 0x4000080 kqsel syz-executor 5233 377758 88186 0 3 0x4000000 smrbar syz-executor 84495 82677 46200 0 2 0 syz-executor 84495 507069 46200 0 3 0x4000080 ttyopn syz-executor 84495 147425 46200 0 3 0x4000080 fsleep syz-executor 38452 20027 61077 0 2 0 syz-executor 38452 385925 61077 0 3 0x4000080 kqsel syz-executor 38452 24915 61077 0 3 0x4000080 fsleep syz-executor 78577 39892 47382 0 3 0x90 nanoslp syz-executor 78577 98891 47382 0 3 0x4000090 sbwait syz-executor 78577 164817 47382 0 3 0x4000090 sbwait syz-executor 78577 141519 47382 0 3 0x4000090 fsleep syz-executor 54900 106938 32607 60929 3 0x90 nanoslp syz-executor 54900 83774 32607 60929 3 0x4000090 kqsel syz-executor 54900 433559 32607 60929 3 0x4000090 fsleep syz-executor 54900 123363 32607 60929 3 0x4000090 fsleep syz-executor 44815 8119 0 0 3 0x14280 nfsidl nfsio 80569 80534 0 0 3 0x14280 nfsidl nfsio 63355 382339 0 0 3 0x14280 nfsidl nfsio 42312 468661 0 0 3 0x14280 nfsidl nfsio 37051 448691 0 0 3 0x14280 nfsidl nfsio 43131 148405 0 0 3 0x14280 nfsidl nfsio 16282 428065 0 0 3 0x14280 nfsidl nfsio 72691 198515 0 0 3 0x14280 nfsidl nfsio 3781 278572 0 0 3 0x14280 nfsidl nfsio 61273 126164 0 0 3 0x14280 nfsidl nfsio 5371 417431 0 0 3 0x14280 nfsidl nfsio 2988 522892 0 0 3 0x14280 nfsidl nfsio 48215 295485 0 0 3 0x14280 nfsidl nfsio 42519 264302 0 0 3 0x14280 nfsidl nfsio 88625 245547 0 0 3 0x14280 nfsidl nfsio 42598 205395 0 0 3 0x14280 nfsidl nfsio 90244 422855 0 0 3 0x14280 nfsidl nfsio 94240 465573 0 0 3 0x14280 nfsidl nfsio 75454 165651 0 0 3 0x14280 nfsidl nfsio 28650 231447 0 0 3 0x14280 nfsidl nfsio 46200 128107 59088 0 3 0x82 nanoslp syz-executor 47382 327186 59088 0 3 0x82 nanoslp syz-executor 83837 437940 59088 0 3 0x82 nanoslp syz-executor 88186 253798 59088 0 3 0x82 nanoslp syz-executor 441 207877 59088 0 3 0x2 biowait syz-executor 89721 421728 59088 0 3 0x82 nanoslp syz-executor 32607 190511 59088 0 3 0x82 nanoslp syz-executor 61077 114077 59088 0 3 0x82 nanoslp syz-executor 59088 419364 502 0 3 0x82 kqread syz-executor 502 224222 9348 0 3 0x10008a sigsusp ksh 9348 69373 79239 0 3 0x98 kqread sshd-session 79239 203040 93819 0 3 0x92 kqread sshd-session 24947 453412 1 0 3 0x100083 ttyin getty 93819 267154 1 0 3 0x88 kqread sshd 3435 98002 55559 74 3 0x1100092 bpf pflogd 55559 240904 1 0 3 0x80 sbwait pflogd 3565 419637 24461 73 3 0x1100090 kqread syslogd 24461 407434 1 0 3 0x100082 sbwait syslogd 89004 434796 1 0 3 0x100080 kqread resolvd 25543 454938 29332 77 3 0x100092 kqread dhcpleased 91476 408920 29332 77 3 0x100092 kqread dhcpleased 29332 196270 1 0 3 0x80 kqread dhcpleased 75883 481419 0 0 3 0x14200 bored smr 29163 335606 0 0 2 0x14200 zerothread 50455 24141 0 0 3 0x14200 aiodoned aiodoned 36408 21658 0 0 3 0x14200 syncer update 7950 223267 0 0 3 0x14200 cleaner cleaner 24874 268951 0 0 3 0x14200 reaper reaper 21905 95445 0 0 3 0x14200 pgdaemon pagedaemon 86902 173543 0 0 3 0x14200 bored viomb 7772 11604 0 0 3 0x40014200 acpi0 acpi0 20326 131201 0 0 3 0x40014200 idle1 72205 58613 0 0 3 0x14200 bored softnet1 28916 49970 0 0 3 0x14200 bored softnet0 33005 341517 0 0 3 0x14200 smrbar systqmp 40091 320678 0 0 3 0x14200 bored systq 54040 84920 0 0 3 0x14200 tmoslp softclockmp 58760 46260 0 0 3 0x40014200 tmoslp softclock 53095 500163 0 0 3 0x40014200 idle0 1 460165 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 48866 (syz-executor) thread 0xffff800035797a20 (64872) Process 441 (syz-executor) thread 0xffff8000ffffcf98 (207877) Process 33005 (systqmp) thread 0xffff8000ffffe530 (341517) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11099 12475K 12475K 166960K 12345 0 pcb 19 12K 12K 166960K 52 0 rtable 261 12K 12K 166960K 401 0 pf 44 19K 26K 166960K 91 0 ifaddr 48 8K 8K 166960K 57 0 ifgroup 68 2K 2K 166960K 79 0 sysctl 3 1K 9K 166960K 8 0 counters 82 38K 38K 166960K 160 0 ioctlops 0 0K 4K 166960K 1572 0 iov 0 0K 16K 166960K 12 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1293 81K 81K 166960K 1495 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 12 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 314 0 sigio 0 0K 0K 166960K 2 0 proc 72 115K 147K 166960K 565 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 29 0 in_multi 101 7K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 408 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 240 151K 166K 166960K 4711 0 UVM aobj 4 2K 2K 166960K 5 0 pinsyscall 42 84K 102K 166960K 1500 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 15 0K 2K 166960K 35 0 temp 50 9113K 12966K 166960K 12864 0 kqueue 14 22K 30K 166960K 52 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 51 0 48 1 0 1 1 0 8 0 rtentry 176 117 0 3 6 0 6 6 0 8 0 unpcb 144 125 0 102 1 0 1 1 0 8 0 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpcb 736 185 0 180 7 0 7 7 0 8 6 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 363 0 350 7 0 7 7 0 8 5 nd6 152 25 0 0 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 mppekey 1024 33 0 33 1 0 1 1 0 8 1 ppxss 1192 42 0 39 1 0 1 1 0 8 0 pppxif 1576 3 0 0 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 10 0 1 2 1 1 1 0 8 0 pftag 88 2 0 2 1 1 0 1 0 8 0 pfstitem 24 37 0 0 1 0 1 1 0 8 0 pfstkey 128 44 0 8 2 0 2 2 0 8 0 pfstate 448 39 0 4 4 0 4 4 0 8 0 pfrule 1360 25 0 20 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 467 0 0 30 0 30 30 0 8 0 art_table 40 469 0 0 5 0 5 5 0 8 0 art_node 32 117 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 10 0 1 1 0 1 1 0 8 0 shmpl 112 2 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1910 0 442 93 0 93 93 0 8 0 ffsino 296 1910 0 442 114 0 114 114 0 8 0 nchpl 144 2357 0 652 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2076 0 0 116 0 116 116 0 8 0 namei 1024 7867 0 7867 2 1 1 2 0 8 1 percpumem 16 95 0 39 1 0 1 1 0 8 0 kstatmem 264 41 0 8 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8202 0 8201 4 3 1 3 1 8 0 plimitpl 152 48 0 31 1 0 1 1 0 8 0 sigapl 424 660 0 593 8 0 8 8 0 8 0 knotepl 120 310 0 0 10 0 10 10 0 8 0 kqueuepl 224 80 0 65 2 0 2 2 0 8 1 pipepl 344 145 0 118 3 0 3 3 0 8 0 fdescpl 528 624 0 593 3 0 3 3 0 8 0 filepl 160 2882 0 2655 13 0 13 13 0 8 3 lockfpl 104 110 0 108 1 0 1 1 0 8 0 lockfspl 48 45 0 43 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 280 0 265 1 0 1 1 0 8 0 zombiepl 144 593 0 593 1 0 1 1 0 8 1 processpl 1232 660 0 593 6 0 6 6 0 8 0 procpl 664 978 0 897 8 0 8 8 0 8 0 sockpl 752 543 0 504 10 0 10 10 0 8 5 mcl64k 65536 4 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 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 119 0 0 15 0 15 15 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 141 0 0 9 0 9 9 0 8 0 bufpl 272 2891 0 105 186 0 186 186 0 8 0 anonpl 32 7484 0 0 61 0 61 61 0 246 0 amapchunkpl 152 14486 0 13994 33 0 33 33 0 158 12 amappl16 200 2405 0 2375 16 4 12 14 0 8 8 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 453 0 452 1 0 1 1 0 8 0 amappl13 176 132 0 120 1 0 1 1 0 8 0 amappl12 168 884 0 854 2 0 2 2 0 8 0 amappl11 160 2 0 1 1 0 1 1 0 8 0 amappl10 152 68 0 53 1 0 1 1 0 8 0 amappl9 144 274 0 274 1 1 0 1 0 8 0 amappl8 136 103 0 101 1 0 1 1 0 8 0 amappl7 128 163 0 150 1 0 1 1 0 8 0 amappl6 120 228 0 225 1 0 1 1 0 8 0 amappl5 112 114 0 103 1 0 1 1 0 8 0 amappl4 104 307 0 284 1 0 1 1 0 8 0 amappl3 96 2714 0 2600 4 0 4 4 0 8 0 amappl2 88 566 0 504 2 0 2 2 0 8 0 amappl1 80 11346 0 10742 15 1 14 15 0 8 1 amappl 88 3931 0 3761 5 0 5 5 0 92 0 uvmvnodes 80 111 0 0 3 0 3 3 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 128 254 0 254 2 1 1 1 0 8 1 dma64 64 7 0 7 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 4 0 1 1 0 1 1 0 8 0 uaddrrnd 24 624 0 593 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 624 0 593 1 0 1 1 0 8 0 vmmpekpl 168 7054 0 7020 2 0 2 2 0 8 0 vmmpepl 168 49170 0 47239 94 0 94 94 0 357 6 vmsppl 488 623 0 593 5 1 4 5 0 8 0 rwobjpl 80 17230 0 16177 27 0 27 27 0 8 2 pdppl 4096 1255 0 1186 101 30 71 83 0 8 2 pvpl 32 14826 0 0 121 1 120 121 0 265 0 pmappl 256 623 0 593 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 468 0 34 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83915ff0) 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(ffffffff83aae840) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aae840) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80003c47d4a0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7dd39c1d59d0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff83915ff0) 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(ffffffff83aae840) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83aae840) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80003c47d4a0,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7dd39c1d59d0, 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(ffffffff834b9fed) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9df4,ffffffff8350b526,3bb,ffffffff8353441c) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c45ded0,ffffffff834ae198) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff800035798000,ffff80003c45dec8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800035797a20) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4655a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006b8772d8,1,fffffc00097fd208,ffff800035797a20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006be37ce0,ffff800035797a20) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006be37ce0,ffff800035797a20) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff800035797a20,ffff80003c465870,ffff80003c4657c0) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c465870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c465870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10d6dc8d640, count: 1 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b9fed) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9df4,ffffffff8350b526,3bb,ffffffff8353441c) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c45ded0,ffffffff834ae198) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(ffff800035798000,ffff80003c45dec8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff800035797a20) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c4655a0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffc006b8772d8,1,fffffc00097fd208,ffff800035797a20) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffc006be37ce0,ffff800035797a20) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffc006be37ce0,ffff800035797a20) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffc006be37ce0,ffff800035797a20) at closef+0x192 sys/kern/kern_descrip.c:1265 sys_closefrom(ffff800035797a20,ffff80003c465870,ffff80003c4657c0) at sys_closefrom+0x13c sys/kern/kern_descrip.c:1471 syscall(ffff80003c465870) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c465870) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x10d6dc8d640, count: -14