panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 995 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *346541 4903 0 0 0x4000000 1K syz-executor 306310 75391 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83460df8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340ac10,ffffffff8340f6a4,3e3,ffffffff8340f6ec) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c415788,ffffffff83353808) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(ffff80003a80b000,ffff80003c415780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a263ff0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c459460) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b627e70,1,fffffd807f7d25b0,ffff80002a263ff0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800da52a50,ffff80002a263ff0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd800da52a50,ffff80002a263ff0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff80003c4596c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4596c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5e2a9a44550, count: 2 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 995 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83460df8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340ac10,ffffffff8340f6a4,3e3,ffffffff8340f6ec) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c415788,ffffffff83353808) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(ffff80003a80b000,ffff80003c415780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a263ff0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c459460) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b627e70,1,fffffd807f7d25b0,ffff80002a263ff0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800da52a50,ffff80002a263ff0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd800da52a50,ffff80002a263ff0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff80003c4596c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4596c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5e2a9a44550, count: -13 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c459230 rbx 0xffff8000299dedcf rdx 0xffff800001484f80 rcx 0xffff80002a263ff0 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x5abd7ea9b7913b91 r11 0x9c7cec9ecae0e71f r12 0xffff8000299debd0 r13 0 r14 0 r15 0x1 rip 0xffffffff8307b4a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c459220 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=346541 pid=4903 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a27b2b8,0xffffffff83915bb8 process=0xffff8000ffff2fa0 user=0xffff80003c454000, vmspace=0xfffffd806bb67200 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37271 338265 24334 0 2 0 syz-executor 37271 46757 24334 0 3 0x4000080 fsleep syz-executor 98714 513055 52373 0 2 0 syz-executor 98714 454607 52373 0 3 0x4000080 fsleep syz-executor 77145 321338 5796 0 3 0x80 nanoslp syz-executor 77145 281272 5796 0 3 0x4000080 fsleep syz-executor 77145 481993 5796 0 3 0x4000080 fsleep syz-executor 77145 387679 5796 0 3 0x4000080 fsleep syz-executor 4903 448787 88737 0 2 0 syz-executor 4903 32128 88737 0 3 0x4000080 semwait syz-executor 4903 225119 88737 0 3 0x4000000 smrbar syz-executor * 4903 346541 88737 0 7 0x4000000 syz-executor 93838 407364 0 0 3 0x14200 bored sosplice 82137 34146 96787 0 3 0x100082 sbwait ndp 96787 172534 60178 0 3 0x10008a sigsusp sh 88737 426306 89410 0 3 0x82 nanoslp syz-executor 96228 316920 89410 0 3 0x82 nanoslp syz-executor 24334 453949 89410 0 3 0x82 nanoslp syz-executor 5796 174407 89410 0 3 0x82 nanoslp syz-executor 60178 130444 89410 0 3 0x82 wait syz-executor 34899 11852 89410 0 3 0x82 nanoslp syz-executor 52373 405828 89410 0 3 0x82 nanoslp syz-executor 89949 107515 89410 0 3 0x82 nanoslp syz-executor 89410 479420 4027 0 3 0x82 kqread syz-executor 4027 10024 75698 0 3 0x10008a sigsusp ksh 75698 172215 24678 0 3 0x98 kqread sshd-session 24678 35287 94049 0 3 0x92 kqread sshd-session 38565 259086 1 0 3 0x100083 ttyin getty 94049 35894 1 0 3 0x88 kqread sshd 79618 243016 5332 74 3 0x1100092 bpf pflogd 5332 221789 1 0 3 0x80 sbwait pflogd 57856 332642 74720 73 3 0x1100090 kqread syslogd 74720 60794 1 0 3 0x100082 sbwait syslogd 55804 143857 1 0 3 0x100080 kqread resolvd 99714 96108 92996 77 3 0x100092 kqread dhcpleased 21911 580 92996 77 3 0x100092 kqread dhcpleased 92996 345031 1 0 3 0x80 kqread dhcpleased 33880 142553 0 0 3 0x14200 pause smr 56942 420627 0 0 3 0x14200 pgzero zerothread 97863 185570 0 0 3 0x14200 aiodoned aiodoned 41725 398852 0 0 3 0x14200 syncer update 28778 501652 0 0 3 0x14200 cleaner cleaner 75391 306310 0 0 7 0x14200 reaper 66137 292923 0 0 3 0x14200 pgdaemon pagedaemon 35822 251524 0 0 3 0x14200 bored viomb 48113 4130 0 0 3 0x40014200 acpi0 acpi0 91806 34579 0 0 3 0x40014200 idle1 67328 176795 0 0 3 0x14200 bored softnet3 73791 275991 0 0 3 0x14200 bored softnet2 2791 386590 0 0 3 0x14200 bored softnet1 66937 200203 0 0 3 0x14200 bored softnet0 40669 220970 0 0 3 0x14200 bored systqmp 87483 167695 0 0 3 0x14200 bored systq 1984 419032 0 0 3 0x14200 tmoslp softclockmp 83060 43344 0 0 3 0x40014200 tmoslp softclock 86830 459380 0 0 3 0x40014200 idle0 1 265709 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive mutex amappl r = 0 (0xffffffff83a0a168) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 pool_put+0xa6 sys/kern/subr_pool.c:801 #4 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #5 uvm_map_teardown+0x358 sys/uvm/uvm_map.c:2516 #6 uvmspace_free+0xcd sys/uvm/uvm_map.c:3420 #7 reaper+0x246 sys/kern/kern_exit.c:481 #8 proc_trampoline+0x10 Process 4903 (syz-executor) thread 0xffff80002a263ff0 (346541) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 11221K 11286K 166960K 11519 0 pcb 17 12K 12K 166960K 29 0 rtable 221 9K 9K 166960K 384 0 pf 38 18K 21K 166960K 69 0 ifaddr 46 7K 7K 166960K 54 0 ifgroup 60 2K 2K 166960K 71 0 sysctl 1 1K 1K 166960K 1 0 counters 68 36K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1506 0 iov 0 0K 24K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1343 84K 85K 166960K 1478 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 0K 166960K 15 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 244K 166960K 281 0 proc 72 91K 128K 166960K 540 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 13 0 in_multi 96 7K 7K 166960K 103 0 ether_multi 1 0K 0K 166960K 1 0 mrt 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 387 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 245 170K 183K 166960K 4086 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 101K 166960K 1376 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 10 0 NDP 13 0K 2K 166960K 32 0 temp 41 8683K 8751K 166960K 6445 0 kqueue 14 22K 26K 166960K 44 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 176 114 0 16 5 0 5 5 0 8 0 unpcb 144 157 0 140 4 0 4 4 0 8 3 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 75 0 71 4 0 4 4 0 8 3 arp 128 19 0 0 1 0 1 1 0 8 0 inpcb 384 225 0 218 8 0 8 8 0 8 7 nd6 144 23 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 ppxss 1192 6 0 5 1 0 1 1 0 8 0 pppxif 1504 3 0 2 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 3 0 1 2 1 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 2 0 1 2 1 1 1 0 8 0 pfstitem 24 32 0 0 1 0 1 1 0 8 0 pfstkey 128 32 0 0 2 0 2 2 0 8 0 pfstate 384 32 0 0 4 0 4 4 0 8 0 pfrule 1344 24 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 464 0 53 29 0 29 29 0 8 2 art_table 32 465 0 53 4 0 4 4 0 8 0 art_node 16 112 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 5 1 0 1 1 0 8 1 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 11 0 2 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1808 0 297 95 0 95 95 0 8 0 ffsino 288 1808 0 297 109 0 109 109 0 8 0 nchpl 144 2181 0 490 63 0 63 63 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 uvmvnodes 80 1958 0 0 40 0 40 40 0 8 0 vnodes 216 1958 0 0 109 0 109 109 0 8 0 namei 1024 6656 0 6656 2 1 1 2 0 8 1 percpumem 16 56 0 7 1 0 1 1 0 8 0 kstatmem 264 32 0 6 2 0 2 2 0 8 0 scxspl 216 6918 0 6918 3 2 1 2 1 8 1 plimitpl 152 43 0 26 1 0 1 1 0 8 0 sigapl 424 576 0 524 7 0 7 7 0 8 0 futexpl 64 2269 0 2264 1 0 1 1 0 8 0 knotepl 120 312 0 0 10 0 10 10 0 8 0 kqueuepl 224 71 0 60 1 0 1 1 0 8 0 pipepl 336 114 0 87 3 0 3 3 0 8 0 fdescpl 520 557 0 526 3 0 3 3 0 8 0 filepl 160 2289 0 2073 13 0 13 13 0 8 3 lockfpl 104 71 0 68 1 0 1 1 0 8 0 lockfspl 48 26 0 23 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 220 0 207 1 0 1 1 0 8 0 zombiepl 144 527 0 524 2 1 1 1 0 8 0 processpl 1216 576 0 524 5 0 5 5 0 8 0 procpl 680 808 0 747 6 0 6 6 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 728 435 0 407 10 0 10 10 0 8 7 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 31 0 0 4 0 4 4 0 8 0 mtagpl 96 9 0 0 1 0 1 1 0 8 0 mbufpl 256 195 0 0 13 0 13 13 0 8 0 bufpl 280 2545 0 123 173 0 173 173 0 8 0 anonpl 32 9645 0 0 79 1 78 78 0 246 0 amapchunkpl 152 12535 0 12048 27 0 27 27 0 158 7 amappl16 200 2897 0 2875 23 13 10 15 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 146 0 133 1 0 1 1 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 1209 0 1175 4 1 3 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 9 0 9 1 1 0 1 0 8 0 amappl9 144 310 0 310 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 109 0 96 1 0 1 1 0 8 0 amappl6 120 183 0 179 1 0 1 1 0 8 0 amappl5 112 125 0 116 1 0 1 1 0 8 0 amappl4 104 336 0 315 1 0 1 1 0 8 0 amappl3 96 2153 0 2041 5 1 4 4 0 8 0 amappl2 88 636 0 572 2 0 2 2 0 8 0 amappl1 80 8902 0 8268 15 0 15 15 0 8 0 amappl 88 3365 0 3200 5 0 5 5 0 92 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 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 557 0 525 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 557 0 525 1 0 1 1 0 8 0 vmmpekpl 168 6309 0 6274 2 0 2 2 0 8 0 vmmpepl 168 42651 0 40656 101 0 101 101 0 357 10 vmsppl 480 556 0 525 5 0 5 5 0 8 0 rwobjpl 72 16760 0 13827 57 0 57 57 0 8 3 pdppl 4096 1122 0 1050 102 28 74 84 0 8 2 pvpl 32 16196 0 0 132 1 131 131 0 265 0 pmappl 256 556 0 525 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 395 0 32 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837f2ff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff838f3e30) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f3e30) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 reaper(ffff80002a238548) at reaper+0x24b sys/kern/kern_exit.c:482 end trace frame: 0x0, count: 9 ddb{0}> trace x86_ipi_db(ffffffff837f2ff0) 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+0x33 kd_curproc sys/dev/kcov.c:585 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x33 sys/dev/kcov.c:153 __mp_lock(ffffffff838f3e30) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff838f3e30) at __mp_lock+0x1a3 sys/kern/kern_lock.c:144 reaper(ffff80002a238548) at reaper+0x24b sys/kern/kern_exit.c:482 end trace frame: 0x0, count: -6 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(ffffffff83460df8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340ac10,ffffffff8340f6a4,3e3,ffffffff8340f6ec) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c415788,ffffffff83353808) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(ffff80003a80b000,ffff80003c415780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a263ff0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c459460) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b627e70,1,fffffd807f7d25b0,ffff80002a263ff0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800da52a50,ffff80002a263ff0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd800da52a50,ffff80002a263ff0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff80003c4596c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4596c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5e2a9a44550, count: 2 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83460df8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff8340ac10,ffffffff8340f6a4,3e3,ffffffff8340f6ec) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c415788,ffffffff83353808) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(ffff80003a80b000,ffff80003c415780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a263ff0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80003c459460) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b627e70,1,fffffd807f7d25b0,ffff80002a263ff0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800da52a50,ffff80002a263ff0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800da52a50,ffff80002a263ff0) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd800da52a50,ffff80002a263ff0) at closef+0x192 sys/kern/kern_descrip.c:1249 syscall(ffff80003c4596c0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4596c0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5e2a9a44550, count: -13