panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83337b86) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83378eca,ffffffff833d7bec,3b7,ffffffff833b1c48) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a96b0b8,ffffffff8332e64b) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a96b0b0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003ca51a28) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000339436c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80690a6b30,1,fffffd8007bfb680,ffff80003ca51a28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ce1ac38,ffff80003ca51a28) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ce1ac38,ffff80003ca51a28) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ca51a28) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003ca51a28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ca51a28,ffff800033943a20,ffff800033943970) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800033943a10, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_synch.c", line 951 ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83337b86) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83378eca,ffffffff833d7bec,3b7,ffffffff833b1c48) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a96b0b8,ffffffff8332e64b) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a96b0b0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003ca51a28) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000339436c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80690a6b30,1,fffffd8007bfb680,ffff80003ca51a28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ce1ac38,ffff80003ca51a28) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ce1ac38,ffff80003ca51a28) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ca51a28) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003ca51a28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ca51a28,ffff800033943a20,ffff800033943970) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033943a20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033943a20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x759409451780, count: -16 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000339434a0 rbx 0 rdx 0 rcx 0 rax 0xffff80003ca51a28 r8 0x101010101010101 r9 0x8080808080808080 r10 0xbce2149a0417f3f r11 0xf0f91a6b122b806b r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff82ac8e15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800033943490 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb> show proc PROC (syz-executor) tid=88885 pid=33867 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003ca51a28 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003ca502d0,0xffff80003ca51508 process=0xffff80002a8896d0 user=0xffff80003393e000, vmspace=0xfffffd8064dd32f8 estcpu=34, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 30256 302263 92539 0 2 0 syz-executor 15054 349512 47623 0 2 0 syz-executor 42768 284292 71896 0 2 0 syz-executor 42768 88050 71896 0 3 0x4000080 fsleep syz-executor 42768 132545 71896 0 3 0x4000080 fsleep syz-executor 1827 449503 37372 0 2 0 syz-executor 1827 509174 37372 0 3 0x4000080 fsleep syz-executor 58357 151388 92082 0 4 0x82000 syz-executor 58357 222037 92082 0 2 0x4082000 syz-executor 58357 87183 92082 0 3 0x4002000 suspend syz-executor 58357 497436 92082 0 4 0x4082000 syz-executor 37372 253775 12062 0 3 0x82 nanoslp syz-executor 98776 17270 1 0 3 0x100083 ttyin getty 13717 437192 12062 0 2 0x2 syz-executor 4478 411091 0 0 3 0x14280 nfsidl nfsio 36329 206063 0 0 3 0x14280 nfsidl nfsio 10470 12665 0 0 3 0x14280 nfsidl nfsio 93104 161794 0 0 3 0x14280 nfsidl nfsio 62777 480175 0 0 3 0x14280 nfsidl nfsio 6828 373123 0 0 3 0x14280 nfsidl nfsio 26683 255264 0 0 3 0x14280 nfsidl nfsio 32520 491917 0 0 3 0x14280 nfsidl nfsio 46472 158506 0 0 3 0x14280 nfsidl nfsio 70433 358657 0 0 3 0x14280 nfsidl nfsio 73572 39592 0 0 3 0x14280 nfsidl nfsio 69327 416609 0 0 3 0x14280 nfsidl nfsio 31771 79005 0 0 3 0x14280 nfsidl nfsio 17571 232607 0 0 3 0x14280 nfsidl nfsio 11757 325957 0 0 3 0x14280 nfsidl nfsio 91134 294711 0 0 3 0x14280 nfsidl nfsio 49099 316313 0 0 3 0x14280 nfsidl nfsio 4042 481169 0 0 3 0x14280 nfsidl nfsio 19718 235875 0 0 3 0x14280 nfsidl nfsio 64115 489674 0 0 3 0x14280 nfsidl nfsio 87832 299716 0 0 3 0x14200 bored sosplice 71896 388757 12062 0 2 0xc82 syz-executor 47815 139139 12062 0 2 0xc82 syz-executor 86078 432330 12062 0 2 0xc82 syz-executor 92539 269206 12062 0 2 0x2 syz-executor 92082 285367 12062 0 2 0xc82 syz-executor 47623 285247 12062 0 2 0xc82 syz-executor 12062 474373 56842 0 2 0x2 syz-executor 56842 446044 71325 0 3 0x10008a sigsusp ksh 71325 56737 67515 0 3 0x98 kqread sshd-session 67515 511871 82549 0 3 0x92 kqread sshd-session 82549 443561 1 0 3 0x88 kqread sshd 41557 123524 5687 73 3 0x1100090 kqread syslogd 5687 3766 1 0 3 0x100082 sbwait syslogd 90500 196881 1 0 3 0x100080 kqread resolvd 63827 317080 88081 77 2 0x100012 dhcpleased 7031 489304 88081 77 3 0x100092 kqread dhcpleased 88081 273324 1 0 3 0x80 kqread dhcpleased 50856 150648 0 0 3 0x14200 bored smr 69325 101558 0 0 2 0x14200 zerothread 98719 452446 0 0 3 0x14200 aiodoned aiodoned 98035 282333 0 0 3 0x14200 syncer update 52748 457525 0 0 3 0x14200 cleaner cleaner 23484 401522 0 0 3 0x14200 reaper reaper 27202 372366 0 0 3 0x14200 pgdaemon pagedaemon 35768 255798 0 0 3 0x14200 bored viomb 54316 270116 0 0 3 0x40014200 acpi0 acpi0 67198 385195 0 0 3 0x14200 bored softnet7 85541 317909 0 0 3 0x14200 bored softnet6 31433 349304 0 0 3 0x14200 bored softnet5 14783 431698 0 0 3 0x14200 bored softnet4 93414 101554 0 0 3 0x14200 bored softnet3 7012 279943 0 0 3 0x14200 bored softnet2 38036 187653 0 0 3 0x14200 bored softnet1 71130 361059 0 0 2 0x14200 softnet0 75839 488598 0 0 3 0x14200 smrbar systqmp 98777 498147 0 0 3 0x14200 bored systq 42034 321465 0 0 2 0x40014200 softclock 44537 329128 0 0 3 0x40014200 idle0 1 370043 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10233 11308K 11628K 166960K 14607 0 pcb 18 16K 18K 166960K 386 0 rtable 167 8K 9K 166960K 547 0 pf 40 14K 19K 166960K 160 0 ifaddr 34 5K 7K 166960K 103 0 ifgroup 60 2K 2K 166960K 168 0 sysctl 4 1K 9K 166960K 22 0 counters 36 18K 18K 166960K 78 0 ioctlops 0 0K 4K 166960K 352 0 iov 0 0K 28K 166960K 105 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1494 94K 94K 166960K 3119 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 6K 166960K 20 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 58 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 1680 0 sigio 0 0K 0K 166960K 24 0 proc 60 59K 124K 166960K 665 0 subproc 72 4K 4K 166960K 93 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 183 0 in_multi 58 4K 7K 166960K 167 0 ether_multi 1 0K 0K 166960K 11 0 mrt 1 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 853 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 225 151K 181K 166960K 16148 0 UVM aobj 67 3K 3K 166960K 69 0 pinsyscall 38 76K 96K 166960K 2756 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 139 0 NDP 14 0K 1K 166960K 69 0 temp 80 8644K 8728K 166960K 66177 0 kqueue 15 24K 32K 166960K 257 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 198 0 195 3 2 1 3 0 8 0 rtentry 136 156 0 98 4 0 4 4 0 8 0 unpcb 144 1002 0 985 10 3 7 7 0 8 6 syncache 336 6 0 6 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 375 0 370 7 3 4 4 0 8 3 arp 88 17 0 8 1 0 1 1 0 8 0 ipq 40 3 0 1 1 0 1 1 0 8 0 ipqe 40 6 0 4 1 0 1 1 0 8 0 inpcb 328 1577 0 1568 15 8 7 10 0 8 5 ip6q 72 5 0 0 1 0 1 1 0 8 0 ip6af 40 5 0 0 1 0 1 1 0 8 0 nd6 104 28 0 17 1 0 1 1 0 8 0 pkpcb 40 43 0 43 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1072 28 0 26 3 2 1 1 0 8 0 pppxif 1384 5 0 4 2 1 1 1 0 8 0 pfstscr 40 5 0 4 1 0 1 1 0 8 0 pffrag 232 6 0 2 1 0 1 1 0 482 0 pffrnode 88 6 0 2 1 0 1 1 0 8 0 pffrent 40 11 0 6 1 0 1 1 0 8 0 pfosfp 40 3 0 1 1 0 1 1 0 8 0 pfosfpen 112 3 0 0 1 0 1 1 0 8 0 pfrktable 1344 6 0 6 1 1 0 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pftag 88 5 0 1 1 0 1 1 0 8 0 pfstitem 24 4 0 2 1 0 1 1 0 8 0 pfstkey 128 13 0 11 1 0 1 1 0 8 0 pfstate 384 7 0 6 1 0 1 1 0 8 0 pfrule 1344 8 0 8 3 2 1 1 0 8 1 rttmr 136 4 0 4 2 1 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 810 0 546 29 10 19 28 0 8 0 art_table 40 814 0 546 5 0 5 5 0 8 0 art_node 32 150 0 96 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 8 1 0 1 1 0 8 0 semupl 112 5 0 5 2 1 1 1 0 8 1 semapl 112 50 0 40 1 0 1 1 0 8 0 shmpl 112 66 0 2 2 0 2 2 0 8 0 dirhash 1024 36 0 19 3 0 3 3 0 8 0 dino2pl 256 4286 0 2786 95 0 95 95 0 8 0 ffsino 256 4286 0 2786 95 0 95 95 0 8 0 nchpl 144 6504 0 4813 63 0 63 63 0 8 0 rtmask 32 3 0 3 1 0 1 1 0 8 1 uvmvnodes 80 5538 0 0 114 0 114 114 0 8 0 vnodes 216 5538 0 0 308 0 308 308 0 8 0 namei 1024 22651 0 22651 3 2 1 2 0 8 1 pfiaddrpl 120 1 0 1 1 1 0 1 0 8 0 kstatmem 264 94 0 66 3 0 3 3 0 8 0 scsiplug 72 6 0 6 3 2 1 1 0 8 1 scxspl 216 27712 0 27712 15 7 8 8 1 8 8 plimitpl 152 530 0 513 1 0 1 1 0 8 0 sigapl 424 1966 0 1896 9 0 9 9 0 8 0 knotepl 120 340562 0 340513 30 19 11 16 0 8 8 kqueuepl 184 513 0 502 7 3 4 4 0 8 3 pipepl 304 261 0 234 8 5 3 8 0 8 0 fdescpl 448 1921 0 1892 5 1 4 5 0 8 0 filepl 120 12047 0 11827 17 3 14 14 0 8 3 lockfpl 104 713 0 710 2 1 1 2 0 8 0 lockfspl 48 317 0 314 1 0 1 1 0 8 0 sessionpl 144 28 0 20 1 0 1 1 0 8 0 pgrppl 48 60 0 44 1 0 1 1 0 8 0 ucredpl 104 2115 0 2103 1 0 1 1 0 8 0 zombiepl 144 1956 0 1954 2 1 1 1 0 8 0 processpl 1168 1966 0 1896 6 0 6 6 0 8 0 procpl 664 4075 0 3999 8 0 8 8 0 8 0 sosppl 168 8 0 8 2 1 1 1 0 8 1 sockpl 552 2866 0 2837 32 21 11 19 0 8 8 mcl64k 65536 165 0 165 4 3 1 2 0 8 1 mcl16k 16384 22 0 22 1 1 0 1 0 8 0 mcl12k 12288 2 0 2 1 1 0 1 0 8 0 mcl9k 9216 3 0 3 1 1 0 1 0 8 0 mcl8k 8192 112 0 112 3 2 1 1 0 8 1 mcl4k 4096 4621 0 4571 16 7 9 14 0 8 2 mcl2k2 2112 2 0 2 2 2 0 1 0 8 0 mcl2k 2048 2359 0 2345 4 1 3 4 0 8 0 mtagpl 96 171 0 87 3 0 3 3 0 8 0 mbufpl 256 20088 0 19873 20 1 19 19 0 8 1 bufpl 280 12385 0 6157 447 1 446 446 0 8 0 anonpl 24 267914 0 259702 101 0 101 101 0 187 24 amapchunkpl 152 54773 0 54237 52 26 26 46 0 158 2 amappl16 200 5520 0 5260 41 7 34 40 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 116 0 106 1 0 1 1 0 8 0 amappl13 176 9 0 8 1 0 1 1 0 8 0 amappl12 168 2562 0 2535 3 1 2 3 0 8 0 amappl11 160 46 0 36 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 105 0 94 1 0 1 1 0 8 0 amappl6 120 192 0 188 1 0 1 1 0 8 0 amappl5 112 121 0 114 1 0 1 1 0 8 0 amappl4 104 286 0 270 1 0 1 1 0 8 0 amappl3 96 11054 0 10949 4 0 4 4 0 8 0 amappl2 88 687 0 629 2 0 2 2 0 8 0 amappl1 80 14992 0 14453 14 1 13 14 0 8 0 amappl 88 15235 0 15075 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 1 1 0 1 0 8 0 dma128 128 257 0 257 3 2 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 68 0 2 2 0 2 2 0 8 0 uaddrrnd 24 1921 0 1892 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1921 0 1892 1 0 1 1 0 8 0 vmmpekpl 168 15476 0 15432 3 0 3 3 0 8 0 vmmpepl 168 122390 0 120290 120 3 117 117 0 357 11 vmsppl 368 1920 0 1892 4 1 3 4 0 8 0 rwobjpl 40 36660 0 29974 70 0 70 70 0 8 0 pdppl 4096 3848 0 3784 118 52 66 82 0 8 2 pvpl 32 839153 0 825633 221 15 206 206 0 265 53 pmappl 216 1920 0 1892 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 423 0 89 11 0 11 11 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83337b86) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83378eca,ffffffff833d7bec,3b7,ffffffff833b1c48) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a96b0b8,ffffffff8332e64b) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a96b0b0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003ca51a28) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000339436c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80690a6b30,1,fffffd8007bfb680,ffff80003ca51a28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ce1ac38,ffff80003ca51a28) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ce1ac38,ffff80003ca51a28) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ca51a28) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003ca51a28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ca51a28,ffff800033943a20,ffff800033943970) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033943a20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033943a20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x759409451780, count: -16 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83337b86) at panic+0x1cf sys/kern/subr_prf.c:198 __assert(ffffffff83378eca,ffffffff833d7bec,3b7,ffffffff833b1c48) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003a96b0b8,ffffffff8332e64b) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003a96b0b0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003ca51a28) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff8000339436c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80690a6b30,1,fffffd8007bfb680,ffff80003ca51a28) at VOP_CLOSE+0x129 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ce1ac38,ffff80003ca51a28) at vn_closefile+0x11d sys/kern/vfs_vnops.c:615 fdrop(fffffd806ce1ac38,ffff80003ca51a28) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ce1ac38,ffff80003ca51a28) at closef+0x190 sys/kern/kern_descrip.c:1264 fdfree(ffff80003ca51a28) at fdfree+0x115 sys/kern/kern_descrip.c:1195 exit1(ffff80003ca51a28,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003ca51a28,ffff800033943a20,ffff800033943970) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033943a20) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff800033943a20) at syscall+0x962 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x759409451780, count: -16