login: 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 153402 19165 0 0 0 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bbf01) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9431,ffffffff83503d11,3bb,ffffffff8352c494) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a247778,ffffffff834b3ecd) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80002a247770) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffea7e8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002ef8c1e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffef0069ebc6f8,81,ffffef00097fd2d8,ffff8000fffea7e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffef006c5c8d68,ffff8000fffea7e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffef006c5c8d68,ffff8000fffea7e8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffea7e8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffea7e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffea7e8,ffff80002ef8c550,ffff80002ef8c4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002ef8c540, 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 955 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bbf01) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9431,ffffffff83503d11,3bb,ffffffff8352c494) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a247778,ffffffff834b3ecd) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80002a247770) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffea7e8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002ef8c1e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffef0069ebc6f8,81,ffffef00097fd2d8,ffff8000fffea7e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffef006c5c8d68,ffff8000fffea7e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffef006c5c8d68,ffff8000fffea7e8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffea7e8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffea7e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffea7e8,ffff80002ef8c550,ffff80002ef8c4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ef8c550) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ef8c550) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7320b538e720, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002ef8bfb0 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff8000fffea7e8 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9196af5d8e9b11e4 r11 0x3c689befba814982 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff811db025 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ef8bfa0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=176631 pid=7852 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff8000fffea7e8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000ffff27e0,0xffff8000ffff22c0 process=0xffff8000fffed828 user=0xffff80002ef87000, vmspace=0xffffef006e7fb010 estcpu=36, cpticks=5, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74583 224183 0 0 3 0x14280 nfsidl nfsio 55201 144959 0 0 3 0x14280 nfsidl nfsio 47812 35683 0 0 3 0x14280 nfsidl nfsio 95108 316360 0 0 3 0x14280 nfsidl nfsio 18823 456212 0 0 3 0x14280 nfsidl nfsio 58641 360096 0 0 3 0x14280 nfsidl nfsio 15224 300575 0 0 3 0x14280 nfsidl nfsio 7285 67243 0 0 3 0x14280 nfsidl nfsio 18298 312302 0 0 3 0x14280 nfsidl nfsio 43783 433697 0 0 3 0x14280 nfsidl nfsio 73829 380654 0 0 3 0x14280 nfsidl nfsio 82006 221015 0 0 3 0x14280 nfsidl nfsio 2635 347486 0 0 3 0x14280 nfsidl nfsio 84737 236331 0 0 3 0x14280 nfsidl nfsio 59366 344588 0 0 3 0x14280 nfsidl nfsio 86701 17275 0 0 3 0x14280 nfsidl nfsio 74984 84081 0 0 3 0x14280 nfsidl nfsio 5487 442928 0 0 3 0x14280 nfsidl nfsio 42525 130040 0 0 3 0x14280 nfsidl nfsio 80122 190887 0 0 3 0x14280 nfsidl nfsio 19165 153402 7535 0 7 0 syz-executor 19165 182299 7535 0 2 0x4000000 syz-executor 66539 209400 65870 0 2 0 syz-executor 66539 326617 65870 0 3 0x4000080 fsleep syz-executor 93968 37214 15740 0 3 0x80 nanoslp syz-executor 93968 225886 15740 0 3 0x4000000 smrbar syz-executor 93237 5329 1 0 3 0x100083 ttyin getty 61854 490881 75355 0 3 0x100082 sbwait arp 75355 124280 74000 0 3 0x10008a sigsusp sh 64100 245853 53273 0 2 0x3 syz-executor 66239 360607 53273 0 3 0x82 nanoslp syz-executor 7535 181155 53273 0 2 0x3 syz-executor 15740 315766 53273 0 3 0x82 nanoslp syz-executor 62619 276082 53273 0 2 0x2 syz-executor 65870 111463 53273 0 2 0x3 syz-executor 81622 187614 53273 0 2 0x3 syz-executor 74000 115239 53273 0 3 0x82 wait syz-executor 53273 53035 1 0 3 0x82 kqread syz-executor 47791 354101 1 0 3 0x8a kqread sshd 33676 327249 70669 74 3 0x1100092 bpf pflogd 70669 206505 1 0 3 0x80 sbwait pflogd 90711 429968 51737 73 3 0x1100090 kqread syslogd 51737 260455 1 0 3 0x100082 sbwait syslogd 5519 195681 1 0 3 0x100080 kqread resolvd 77603 402938 83469 77 3 0x100092 kqread dhcpleased 79003 253126 83469 77 3 0x100092 kqread dhcpleased 83469 15447 1 0 3 0x80 kqread dhcpleased 96888 438812 0 0 3 0x14200 bored smr 38508 300326 0 0 2 0x14200 zerothread 61478 230894 0 0 3 0x14200 aiodoned aiodoned 43139 61109 0 0 3 0x14200 syncer update 44 499255 0 0 3 0x14200 cleaner cleaner 38934 353235 0 0 2 0x14200 reaper 36708 132852 0 0 3 0x14200 pgdaemon pagedaemon 1383 11499 0 0 3 0x14200 bored viomb 14249 162648 0 0 3 0x40014200 acpi0 acpi0 46039 265163 0 0 3 0x40014200 idle1 33835 116428 0 0 3 0x14200 bored softnet1 41165 158387 0 0 3 0x14200 bored softnet0 60357 111303 0 0 3 0x14200 bored systqmp 24891 285655 0 0 3 0x14200 bored systq 45179 365349 0 0 3 0x14200 tmoslp softclockmp 72675 217962 0 0 3 0x40014200 tmoslp softclock 11245 458218 0 0 3 0x40014200 idle0 1 175807 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 19165 (syz-executor) thread 0xffff8000fffeb4e0 (182299) exclusive rwlock vmmaplk r = 0 (0xffffef006c685308) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 38934 (reaper) thread 0xffff8000ffffd760 (353235) exclusive rwlock kmmaplk r = 0 (0xffffffff83a10448) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5171 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1798 #4 km_free+0x85 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1ca sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11073 12225K 12345K 166960K 12309 0 pcb 17 12K 12K 166960K 75 0 rtable 251 9K 10K 166960K 415 0 pf 38 18K 24K 166960K 106 0 ifaddr 43 7K 7K 166960K 53 0 ifgroup 60 2K 2K 166960K 78 0 sysctl 3 1K 9K 166960K 9 0 counters 74 37K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1520 0 iov 0 0K 17K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 82K 166960K 1479 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 18 0 dirhash 15 2K 2K 166960K 24 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 93K 166960K 287 0 sigio 0 0K 0K 166960K 5 0 proc 72 115K 196K 166960K 587 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 33 0 in_multi 90 6K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 401 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 197 144K 167K 166960K 4521 0 UVM aobj 7 2K 2K 166960K 8 0 pinsyscall 37 74K 105K 166960K 1471 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 6 0 NDP 13 0K 1K 166960K 32 0 temp 45 9116K 9178K 166960K 15073 0 kqueue 13 18K 26K 166960K 71 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 48 0 44 1 0 1 1 0 8 0 rtentry 176 111 0 4 5 0 5 5 0 8 0 unpcb 144 126 0 112 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 80 0 77 4 3 1 4 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 239 0 231 5 3 2 4 0 8 1 nd6 152 24 0 1 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 4 0 3 2 1 1 1 0 8 0 pppxif 1576 2 0 1 2 1 1 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 2 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 8 0 8 1 1 0 1 0 8 0 pfanchor 1288 13 0 12 1 0 1 1 0 8 0 pftag 88 4 0 2 1 0 1 1 0 8 0 pfstitem 24 31 0 1 1 0 1 1 0 8 0 pfstkey 128 31 0 1 1 0 1 1 0 8 0 pfstate 448 31 0 1 4 0 4 4 0 8 0 pfrule 1360 26 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 447 0 21 27 0 27 27 0 8 0 art_table 40 448 0 21 5 0 5 5 0 8 0 art_node 32 110 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 72 14 0 8 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 25 0 6 3 0 3 3 0 8 0 dino2pl 256 1852 0 385 93 0 93 93 0 8 0 ffsino 296 1852 0 385 114 0 114 114 0 8 0 nchpl 144 2276 0 570 64 0 64 64 0 8 0 vnodes 216 2018 0 0 113 0 113 113 0 8 0 namei 1024 7087 0 7087 2 1 1 2 0 8 1 percpumem 16 58 0 6 1 0 1 1 0 8 0 pfiaddrpl 120 2 0 2 1 1 0 1 0 8 0 kstatmem 264 39 0 10 2 0 2 2 0 8 0 scxspl 216 8039 0 8039 11 10 1 8 1 8 1 plimitpl 152 53 0 37 1 0 1 1 0 8 0 sigapl 424 634 0 571 8 1 7 7 0 8 0 knotepl 120 307 0 0 10 0 10 10 0 8 0 kqueuepl 224 82 0 70 1 0 1 1 0 8 0 pipepl 344 137 0 110 3 0 3 3 0 8 0 fdescpl 528 598 0 571 3 0 3 3 0 8 0 filepl 160 2548 0 2335 12 2 10 12 0 8 0 lockfpl 104 81 0 79 1 0 1 1 0 8 0 lockfspl 48 40 0 38 1 0 1 1 0 8 0 sessionpl 144 32 0 24 1 0 1 1 0 8 0 pgrppl 48 43 0 27 1 0 1 1 0 8 0 ucredpl 104 274 0 262 1 0 1 1 0 8 0 zombiepl 144 585 0 584 1 0 1 1 0 8 0 processpl 1232 634 0 571 5 0 5 5 0 8 0 procpl 664 894 0 827 7 1 6 6 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 752 416 0 390 8 3 5 7 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 228 0 0 15 0 15 15 0 8 0 bufpl 272 2753 0 105 177 0 177 177 0 8 0 anonpl 32 7125 0 0 58 0 58 58 0 246 0 amapchunkpl 152 13134 0 12773 30 2 28 28 0 158 6 amappl16 200 1984 0 1959 5 3 2 5 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 486 0 485 1 0 1 1 0 8 0 amappl13 176 125 0 114 1 0 1 1 0 8 0 amappl12 168 856 0 830 2 0 2 2 0 8 0 amappl11 160 10 0 10 2 2 0 1 0 8 0 amappl10 152 68 0 54 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 119 0 116 1 0 1 1 0 8 0 amappl7 128 150 0 137 1 0 1 1 0 8 0 amappl6 120 154 0 152 1 0 1 1 0 8 0 amappl5 112 97 0 88 1 0 1 1 0 8 0 amappl4 104 317 0 297 1 0 1 1 0 8 0 amappl3 96 2517 0 2429 4 0 4 4 0 8 0 amappl2 88 569 0 516 2 0 2 2 0 8 0 amappl1 80 11495 0 11034 15 0 15 15 0 8 0 amappl 88 3742 0 3617 4 0 4 4 0 92 0 uvmvnodes 80 106 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 128 253 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 598 0 571 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 598 0 571 1 0 1 1 0 8 0 vmmpekpl 168 7154 0 7120 2 0 2 2 0 8 0 vmmpepl 168 47421 0 45897 89 13 76 89 0 357 1 vmsppl 488 597 0 571 5 0 5 5 0 8 0 rwobjpl 80 16736 0 15815 24 1 23 24 0 8 0 pdppl 4096 1203 0 1142 105 38 67 85 0 8 6 pvpl 32 13485 0 0 109 0 109 109 0 265 0 pmappl 256 597 0 571 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 463 0 46 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8390bff0) 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(ffffffff83a2a240) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a2a240) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7231193ee2a0, count: 8 ddb{0}> trace x86_ipi_db(ffffffff8390bff0) 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(ffffffff83a2a240) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a2a240) at __mp_lock+0x199 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 end of kernel end trace frame: 0x7231193ee2a0, 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(ffffffff834bbf01) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9431,ffffffff83503d11,3bb,ffffffff8352c494) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a247778,ffffffff834b3ecd) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80002a247770) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffea7e8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002ef8c1e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffef0069ebc6f8,81,ffffef00097fd2d8,ffff8000fffea7e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffef006c5c8d68,ffff8000fffea7e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffef006c5c8d68,ffff8000fffea7e8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffea7e8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffea7e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffea7e8,ffff80002ef8c550,ffff80002ef8c4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002ef8c540, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bbf01) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9431,ffffffff83503d11,3bb,ffffffff8352c494) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a247778,ffffffff834b3ecd) at refcnt_finalize+0x1db sys/kern/kern_synch.c:956 pppx_if_destroy(205b9a,ffff80002a247770) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff8000fffea7e8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002ef8c1e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(ffffef0069ebc6f8,81,ffffef00097fd2d8,ffff8000fffea7e8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(ffffef006c5c8d68,ffff8000fffea7e8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(ffffef006c5c8d68,ffff8000fffea7e8) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(ffffef006c5c8d68,ffff8000fffea7e8) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff8000fffea7e8) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff8000fffea7e8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000fffea7e8,ffff80002ef8c550,ffff80002ef8c4a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ef8c550) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ef8c550) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7320b538e720, count: -16 ddb{1}>