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 70839 51667 0 0x2 0x1 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833722d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0390,ffffffff833c03bf,3b7,ffffffff833e9810) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc434e8,ffffffff833680a2) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003bc434e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c483790) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459240) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069f63480,2,fffffd80097fb2d8,ffff80003c483790) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80654829d0,ffff80003c483790) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80654829d0,ffff80003c483790) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c483790) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c483790,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c483790,ffff80003c4595b0,ffff80003c459500) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c4595a0, 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(ffffffff833722d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0390,ffffffff833c03bf,3b7,ffffffff833e9810) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc434e8,ffffffff833680a2) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003bc434e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c483790) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459240) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069f63480,2,fffffd80097fb2d8,ffff80003c483790) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80654829d0,ffff80003c483790) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80654829d0,ffff80003c483790) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c483790) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c483790,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c483790,ffff80003c4595b0,ffff80003c459500) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4595b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4595b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704ea1085800, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c459010 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff80003c483790 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x9f74caabffd1116 r11 0x1b220a153594bca5 r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff81959585 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c459000 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=265141 pid=48687 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c483790 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c483cc0,0xffff80003c482aa8 process=0xffff80003c4bb0e8 user=0xffff80003c454000, vmspace=0xfffffd806b81e3f0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20563 478236 27806 0 2 0 syz-executor 20563 355715 27806 0 3 0x4000080 kqread syz-executor 20563 74524 27806 0 3 0x4000080 fsleep syz-executor 69155 109444 58431 0 2 0 syz-executor 69155 298228 58431 0 3 0x4000000 smrbar syz-executor 69155 248791 58431 0 3 0x4000080 fsleep syz-executor 4332 50416 51667 0 3 0x80 nanoslp syz-executor 4332 31058 51667 0 3 0x4000080 kqsel syz-executor 4332 391097 51667 0 3 0x4000080 fsleep syz-executor 79348 80104 60374 -1 3 0x90 nanoslp syz-executor 79348 518734 60374 -1 3 0x4000090 kqread syz-executor 79348 223901 60374 -1 3 0x4000090 fsleep syz-executor 27901 309471 0 0 3 0x14280 nfsidl nfsio 30453 216467 0 0 3 0x14280 nfsidl nfsio 52175 180517 0 0 3 0x14280 nfsidl nfsio 66816 154837 0 0 3 0x14280 nfsidl nfsio 97395 250567 0 0 3 0x14280 nfsidl nfsio 13135 450909 0 0 3 0x14280 nfsidl nfsio 91970 56651 0 0 3 0x14280 nfsidl nfsio 53244 225348 0 0 3 0x14280 nfsidl nfsio 61234 287642 0 0 3 0x14280 nfsidl nfsio 88848 477757 0 0 3 0x14280 nfsidl nfsio 26856 361140 0 0 3 0x14280 nfsidl nfsio 71313 446430 0 0 3 0x14280 nfsidl nfsio 16131 423715 0 0 3 0x14280 nfsidl nfsio 34368 240505 0 0 3 0x14280 nfsidl nfsio 3134 72063 0 0 3 0x14280 nfsidl nfsio 89597 6829 0 0 3 0x14280 nfsidl nfsio 95578 266489 0 0 3 0x14280 nfsidl nfsio 56399 138005 0 0 3 0x14280 nfsidl nfsio 44032 519668 0 0 3 0x14280 nfsidl nfsio 54414 117188 0 0 3 0x14280 nfsidl nfsio 62776 205398 0 0 3 0x14200 bored sosplice 59017 153314 25108 0 3 0x82 wait syz-executor 82425 10972 25108 0 3 0x82 nanoslp syz-executor 98518 70768 25108 0 2 0xc82 syz-executor 58431 358429 25108 0 3 0x82 nanoslp syz-executor 60374 98489 25108 0 3 0x82 nanoslp syz-executor 55636 517181 25108 0 3 0x82 nanoslp syz-executor 51667 70839 25108 0 7 0x3 syz-executor 27806 68908 25108 0 3 0x82 nanoslp syz-executor 25108 305953 79171 0 3 0x82 kqread syz-executor 79171 176429 23304 0 3 0x10008a sigsusp ksh 23304 223725 3643 0 3 0x98 kqread sshd-session 3643 410930 87423 0 3 0x92 kqread sshd-session 4886 517170 1 0 3 0x100083 ttyin getty 87423 264351 1 0 3 0x88 kqread sshd 1521 118301 36352 74 3 0x1100092 bpf pflogd 36352 344251 1 0 3 0x80 sbwait pflogd 2770 174272 86981 73 3 0x1100090 kqread syslogd 86981 329413 1 0 3 0x100082 sbwait syslogd 7970 289754 1 0 3 0x100080 kqread resolvd 73220 365670 66848 77 3 0x100092 kqread dhcpleased 91558 83597 66848 77 3 0x100092 kqread dhcpleased 66848 203574 1 0 3 0x80 kqread dhcpleased 92971 371342 0 0 3 0x14200 bored smr 30358 292068 0 0 2 0x14200 zerothread 70481 391014 0 0 3 0x14200 aiodoned aiodoned 24511 379776 0 0 3 0x14200 syncer update 50885 249749 0 0 3 0x14200 cleaner cleaner 24787 229630 0 0 3 0x14200 reaper reaper 29632 13855 0 0 3 0x14200 pgdaemon pagedaemon 9518 70329 0 0 3 0x14200 bored viomb 10681 299075 0 0 3 0x40014200 acpi0 acpi0 34588 404113 0 0 3 0x40014200 idle1 91764 252177 0 0 3 0x14200 bored softnet7 62072 386749 0 0 3 0x14200 bored softnet6 42684 274170 0 0 3 0x14200 bored softnet5 78540 164856 0 0 3 0x14200 bored softnet4 12580 212877 0 0 3 0x14200 bored softnet3 1548 290371 0 0 3 0x14200 bored softnet2 34411 475887 0 0 3 0x14200 bored softnet1 97430 414895 0 0 3 0x14200 bored softnet0 82573 236927 0 0 3 0x14200 bored systqmp 35185 233011 0 0 3 0x14200 bored systq 92748 25337 0 0 3 0x14200 tmoslp softclockmp 30121 368796 0 0 3 0x40014200 tmoslp softclock 39230 399991 0 0 3 0x40014200 idle0 1 152004 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10222 11064K 11290K 166960K 11658 0 pcb 18 12K 12K 166960K 89 0 rtable 203 8K 9K 166960K 320 0 pf 40 18K 21K 166960K 91 0 ifaddr 44 7K 8K 166960K 66 0 ifgroup 60 2K 2K 166960K 90 0 sysctl 1 1K 9K 166960K 7 0 counters 74 37K 37K 166960K 126 0 ioctlops 0 0K 4K 166960K 1562 0 iov 0 0K 24K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1345 85K 85K 166960K 1777 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 16 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 449 0 sigio 0 0K 0K 166960K 2 0 proc 72 115K 164K 166960K 583 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 48 0 in_multi 89 6K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 3 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 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 253 161K 173K 166960K 5537 0 UVM aobj 12 2K 2K 166960K 12 0 pinsyscall 43 86K 104K 166960K 1524 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 3 0K 0K 166960K 24 0 NDP 14 0K 2K 166960K 44 0 temp 43 8643K 8710K 166960K 20389 0 kqueue 18 25K 32K 166960K 90 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 120 118 0 115 3 2 1 3 0 8 0 rtentry 176 107 0 23 5 0 5 5 0 8 0 unpcb 144 216 0 196 2 1 1 2 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 125 0 116 4 2 2 4 0 8 0 arp 128 12 0 1 1 0 1 1 0 8 0 inpcb 328 450 0 434 8 6 2 7 0 8 0 nd6 144 17 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 28 0 25 2 1 1 1 0 8 0 pppxif 1504 2 0 1 1 0 1 1 0 8 0 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 2 0 0 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 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 39 0 1 1 0 1 1 0 8 0 pfstkey 128 39 0 1 2 0 2 2 0 8 0 pfstate 384 39 0 1 4 0 4 4 0 8 0 pfrule 1344 24 0 18 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 256 487 0 89 30 2 28 30 0 8 0 art_table 40 489 0 89 5 0 5 5 0 8 0 art_node 32 107 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 14 0 4 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2333 0 823 95 0 95 95 0 8 0 ffsino 296 2333 0 823 117 0 117 117 0 8 0 nchpl 144 2924 0 1227 63 0 63 63 0 8 0 rtmask 32 8 0 8 2 1 1 1 0 8 1 uvmvnodes 80 2522 0 0 52 0 52 52 0 8 0 vnodes 216 2522 0 0 141 0 141 141 0 8 0 namei 1024 9660 0 9660 2 1 1 1 0 8 1 percpumem 16 78 0 26 1 0 1 1 0 8 0 kstatmem 264 58 0 28 3 1 2 3 0 8 0 scxspl 216 16111 0 16111 11 10 1 8 1 8 1 plimitpl 152 76 0 59 1 0 1 1 0 8 0 sigapl 424 761 0 686 9 0 9 9 0 8 0 knotepl 120 545 0 0 17 0 17 17 0 8 0 kqueuepl 224 145 0 128 3 1 2 2 0 8 0 pipepl 344 164 0 137 6 3 3 6 0 8 0 fdescpl 528 718 0 686 3 0 3 3 0 8 0 filepl 160 4195 0 3955 16 5 11 16 0 8 0 lockfpl 104 161 0 159 1 0 1 1 0 8 0 lockfspl 48 46 0 44 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 1050 0 1036 1 0 1 1 0 8 0 zombiepl 144 690 0 686 1 0 1 1 0 8 0 processpl 1248 761 0 686 6 0 6 6 0 8 0 procpl 664 1300 0 1217 8 0 8 8 0 8 0 sosppl 168 1 0 1 1 1 0 1 0 8 0 sockpl 752 802 0 763 11 7 4 11 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 121 0 0 16 0 16 16 0 8 0 mcl2k 2048 21 0 0 3 0 3 3 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 261 0 0 17 0 17 17 0 8 0 bufpl 280 6702 0 559 439 0 439 439 0 8 0 anonpl 32 10143 0 0 82 0 82 82 0 246 0 amapchunkpl 152 17505 0 16976 31 9 22 28 0 158 1 amappl16 200 2464 0 2435 24 3 21 22 0 8 14 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 179 0 167 1 0 1 1 0 8 0 amappl13 176 5 0 5 2 2 0 1 0 8 0 amappl12 168 1377 0 1345 3 1 2 2 0 8 0 amappl11 160 158 0 144 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 271 0 271 1 1 0 1 0 8 0 amappl8 136 19 0 17 1 0 1 1 0 8 0 amappl7 128 124 0 112 1 0 1 1 0 8 0 amappl6 120 175 0 172 1 0 1 1 0 8 0 amappl5 112 135 0 126 1 0 1 1 0 8 0 amappl4 104 321 0 301 1 0 1 1 0 8 0 amappl3 96 3401 0 3281 4 0 4 4 0 8 0 amappl2 88 650 0 588 2 0 2 2 0 8 0 amappl1 80 9968 0 9367 14 0 14 14 0 8 0 amappl 88 4807 0 4629 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 dma512 512 1 0 1 1 1 0 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 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 718 0 686 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 718 0 686 1 0 1 1 0 8 0 vmmpekpl 168 7730 0 7693 3 0 3 3 0 8 0 vmmpepl 168 52561 0 50533 106 0 106 106 0 357 9 vmsppl 488 717 0 686 5 1 4 5 0 8 0 rwobjpl 80 19101 0 15631 78 0 78 78 0 8 0 pdppl 4096 1444 0 1372 102 30 72 86 0 8 0 pvpl 32 17377 0 0 141 0 141 141 0 265 0 pmappl 256 717 0 686 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 285 0 40 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8381aff0) 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(ffffffff83892778) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83892778) 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 __mp_lock(ffffffff83892778) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83892778) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff80002a2b8fa8,5b,0,ffff80002a341a60) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a2b8fa8,5b,0,ffff80002a341a60) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a341b10) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a341b10) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:769 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d51fc691870, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8381aff0) 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(ffffffff83892778) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83892778) 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 __mp_lock(ffffffff83892778) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83892778) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff80002a2b8fa8,5b,0,ffff80002a341a60) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a2b8fa8,5b,0,ffff80002a341a60) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a341b10) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a341b10) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:769 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d51fc691870, count: -11 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(ffffffff833722d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0390,ffffffff833c03bf,3b7,ffffffff833e9810) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc434e8,ffffffff833680a2) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003bc434e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c483790) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459240) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069f63480,2,fffffd80097fb2d8,ffff80003c483790) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80654829d0,ffff80003c483790) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80654829d0,ffff80003c483790) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c483790) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c483790,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c483790,ffff80003c4595b0,ffff80003c459500) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c4595a0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833722d8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0390,ffffffff833c03bf,3b7,ffffffff833e9810) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003bc434e8,ffffffff833680a2) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff80003bc434e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003c483790) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459240) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8069f63480,2,fffffd80097fb2d8,ffff80003c483790) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80654829d0,ffff80003c483790) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80654829d0,ffff80003c483790) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80654829d0,ffff80003c483790) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c483790) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c483790,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c483790,ffff80003c4595b0,ffff80003c459500) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4595b0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4595b0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x704ea1085800, count: -16