panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 953 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(ffffffff833977e1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d54da,ffffffff833e5e43,3b9,ffffffff8340fba7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44b4e8,ffffffff83390e87) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44b4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c002d18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff2e90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f23c510,41,fffffd80097fb548,ffff80003c002d18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8061d7d240,ffff80003c002d18) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8061d7d240,ffff80003c002d18) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c002d18) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c002d18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c002d18,ffff800039ff3200,ffff800039ff3150) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800039ff31f0, 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 953 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833977e1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d54da,ffffffff833e5e43,3b9,ffffffff8340fba7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44b4e8,ffffffff83390e87) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44b4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c002d18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff2e90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f23c510,41,fffffd80097fb548,ffff80003c002d18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8061d7d240,ffff80003c002d18) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8061d7d240,ffff80003c002d18) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c002d18) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c002d18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c002d18,ffff800039ff3200,ffff800039ff3150) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039ff3200) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff3200) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d44dc66dac0, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800039ff2c60 rbx 0xffff8000299eeddf rdx 0 rcx 0xffff80003c002d18 rax 0xffff8000299edff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa27554f430407d8f r11 0xe002f41672a0bc84 r12 0xffff8000299eebe0 r13 0 r14 0 r15 0x1 rip 0xffffffff823c0875 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800039ff2c50 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=95935 pid=68156 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c002d18 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003c003a10,0xffff80003c0022c8 process=0xffff800035fe9360 user=0xffff800039fee000, vmspace=0xfffffd806bfb45d8 estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 92272 93928 5029 0 2 0 syz-executor 92272 469896 5029 0 2 0x4000000 syz-executor 36601 343142 53142 0 3 0x80 nanoslp syz-executor 36601 321449 53142 0 3 0x4000080 ttyout syz-executor 36601 57619 53142 0 3 0x4000080 fsleep syz-executor 36601 97616 53142 0 3 0x4000080 fsleep syz-executor 95342 177657 41219 0 2 0 syz-executor 95342 10458 41219 0 3 0x4000080 lockf syz-executor 95342 252253 41219 0 3 0x4000080 fsleep syz-executor 69714 336733 0 0 3 0x14200 acct acct 85648 110705 81376 0 3 0x100082 sbwait arp 81376 522965 19247 0 3 0x10008a sigsusp sh 1185 25753 52757 0 3 0x82 nanoslp syz-executor 41219 32908 52757 0 3 0x82 nanoslp syz-executor 61894 236706 52757 0 3 0x82 nanoslp syz-executor 47424 284230 52757 0 3 0x82 nanoslp syz-executor 19247 70937 52757 0 3 0x82 wait syz-executor 5029 455397 52757 0 3 0x82 nanoslp syz-executor 53142 445022 52757 0 3 0x82 nanoslp syz-executor 15366 46957 52757 0 2 0x2 syz-executor 52757 368537 19879 0 3 0x82 kqread syz-executor 19879 293239 13325 0 3 0x10008a sigsusp ksh 13325 523839 82594 0 3 0x98 kqread sshd-session 82594 91209 95672 0 3 0x92 kqread sshd-session 34039 271471 1 0 3 0x100083 ttyopn getty 95672 390292 1 0 3 0x88 kqread sshd 42653 170683 75101 74 3 0x1100092 bpf pflogd 75101 281379 1 0 3 0x80 sbwait pflogd 87402 170985 80579 73 3 0x1100090 kqread syslogd 80579 358493 1 0 3 0x100082 sbwait syslogd 87051 253979 1 0 3 0x100080 kqread resolvd 87958 253197 98554 77 3 0x100092 kqread dhcpleased 90335 486529 98554 77 3 0x100092 kqread dhcpleased 98554 177856 1 0 3 0x80 kqread dhcpleased 27863 470108 0 0 3 0x14200 bored smr 47691 172569 0 0 3 0x14200 pgzero zerothread 68986 127646 0 0 3 0x14200 aiodoned aiodoned 42622 296724 0 0 3 0x14200 syncer update 66942 433395 0 0 3 0x14200 cleaner cleaner 4764 354265 0 0 2 0x14200 reaper 31431 220864 0 0 3 0x14200 pgdaemon pagedaemon 5811 289108 0 0 3 0x14200 bored viomb 73228 183567 0 0 3 0x40014200 acpi0 acpi0 61086 92917 0 0 3 0x40014200 idle1 28900 235988 0 0 3 0x14200 bored softnet1 8388 271134 0 0 3 0x14200 bored softnet0 55721 475276 0 0 3 0x14200 bored systqmp 79037 468360 0 0 3 0x14200 bored systq 87073 232500 0 0 3 0x14200 tmoslp softclockmp 13489 323721 0 0 3 0x40014200 tmoslp softclock 87686 19022 0 0 3 0x40014200 idle0 1 390521 0 0 3 0x82 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 10205 11026K 11218K 166960K 11563 0 pcb 17 12K 12K 166960K 60 0 rtable 198 7K 8K 166960K 376 0 pf 39 18K 21K 166960K 81 0 ifaddr 42 7K 7K 166960K 62 0 ifgroup 60 2K 2K 166960K 98 0 sysctl 1 1K 9K 166960K 7 0 counters 80 37K 37K 166960K 112 0 ioctlops 0 0K 4K 166960K 1547 0 iov 1 0K 16K 166960K 17 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1375 86K 86K 166960K 1523 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 7 0K 0K 166960K 14 0 dirhash 12 2K 2K 166960K 30 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 89K 166960K 335 0 sigio 0 0K 0K 166960K 5 0 proc 72 115K 180K 166960K 549 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 25 0 in_multi 82 6K 6K 166960K 107 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 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 425 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 259 169K 179K 166960K 4816 0 UVM aobj 12 2K 2K 166960K 13 0 pinsyscall 45 90K 104K 166960K 1450 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 20 0 NDP 14 0K 1K 166960K 39 0 temp 43 8651K 8719K 166960K 19362 0 kqueue 13 20K 26K 166960K 57 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 120 111 0 107 3 0 3 3 0 8 2 rtentry 176 111 0 27 5 0 5 5 0 8 0 unpcb 144 400 0 377 6 0 6 6 0 8 4 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 56 0 51 1 0 1 1 0 8 0 arp 136 17 0 2 1 0 1 1 0 8 0 inpcb 328 292 0 283 2 0 2 2 0 8 1 nd6 152 22 0 3 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 1 0 1 1 0 1 1 0 8 1 ppxss 1192 17 0 11 1 0 1 1 0 8 0 pppxif 1504 1 0 0 1 0 1 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 1 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 1 1 0 1 1 0 8 1 pfanchor 1288 1 0 1 1 0 1 1 0 8 1 pfstitem 24 32 0 1 1 0 1 1 0 8 0 pfstkey 128 32 0 1 2 0 2 2 0 8 0 pfstate 384 32 0 1 4 0 4 4 0 8 0 pfrule 1344 25 0 20 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 474 0 109 26 0 26 26 0 8 3 art_table 40 476 0 109 5 0 5 5 0 8 0 art_node 32 110 0 34 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 4 1 0 1 1 0 8 0 semapl 112 9 0 4 1 0 1 1 0 8 0 shmpl 112 10 0 1 1 0 1 1 0 8 0 dirhash 1024 29 0 12 3 0 3 3 0 8 0 dino2pl 256 1948 0 432 95 0 95 95 0 8 0 ffsino 296 1948 0 432 117 0 117 117 0 8 0 nchpl 144 2418 0 711 64 0 64 64 0 8 0 rtmask 32 5 0 3 2 1 1 1 0 8 0 vnodes 216 2125 0 0 119 0 119 119 0 8 0 namei 1024 8028 0 8028 2 1 1 2 0 8 1 percpumem 16 71 0 16 1 0 1 1 0 8 0 kstatmem 264 52 0 22 3 0 3 3 0 8 1 scxspl 216 8711 0 8711 3 2 1 2 1 8 1 plimitpl 152 54 0 37 1 0 1 1 0 8 0 sigapl 424 644 0 594 7 0 7 7 0 8 0 knotepl 120 315 0 0 10 0 10 10 0 8 0 kqueuepl 224 117 0 108 3 0 3 3 0 8 2 pipepl 344 132 0 105 3 0 3 3 0 8 0 fdescpl 528 627 0 594 3 0 3 3 0 8 0 filepl 160 3216 0 2980 15 0 15 15 0 8 5 lockfpl 104 99 0 93 1 0 1 1 0 8 0 lockfspl 48 40 0 35 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 104 312 0 296 1 0 1 1 0 8 0 zombiepl 144 598 0 594 1 0 1 1 0 8 0 processpl 1232 644 0 594 5 0 5 5 0 8 0 procpl 664 1017 0 960 6 0 6 6 0 8 0 sosppl 176 4 0 4 2 1 1 1 0 8 1 sockpl 752 817 0 781 17 5 12 17 0 8 7 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 15 0 15 15 0 8 0 mcl2k 2048 35 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 185 0 0 12 0 12 12 0 8 0 bufpl 280 3342 0 130 230 0 230 230 0 8 0 anonpl 32 7799 0 0 64 1 63 64 0 246 0 amapchunkpl 152 14959 0 14426 27 0 27 27 0 158 5 amappl16 200 2507 0 2478 17 2 15 15 0 8 10 amappl15 192 31 0 31 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 416 0 414 1 0 1 1 0 8 0 amappl12 168 983 0 938 3 0 3 3 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 79 0 65 1 0 1 1 0 8 0 amappl9 144 250 0 249 1 0 1 1 0 8 0 amappl8 136 30 0 26 1 0 1 1 0 8 0 amappl7 128 76 0 75 1 0 1 1 0 8 0 amappl6 120 276 0 261 1 0 1 1 0 8 0 amappl5 112 73 0 62 1 0 1 1 0 8 0 amappl4 104 408 0 375 1 0 1 1 0 8 0 amappl3 96 2505 0 2406 4 1 3 3 0 8 0 amappl2 88 735 0 657 2 0 2 2 0 8 0 amappl1 80 9787 0 9160 15 1 14 15 0 8 0 amappl 88 4076 0 3899 5 0 5 5 0 92 0 uvmvnodes 80 2125 0 0 44 0 44 44 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 12 0 1 1 0 1 1 0 8 0 uaddrrnd 24 627 0 594 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 627 0 594 1 0 1 1 0 8 0 vmmpekpl 168 6837 0 6803 2 0 2 2 0 8 0 vmmpepl 168 47130 0 45108 99 0 99 99 0 357 6 vmsppl 488 626 0 594 5 0 5 5 0 8 0 rwobjpl 80 18082 0 14954 68 0 68 68 0 8 3 pdppl 4096 1262 0 1188 102 28 74 86 0 8 0 pvpl 32 14933 0 0 121 0 121 121 0 265 0 pmappl 256 626 0 594 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 274 0 32 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d6ff0) 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(ffffffff839de8c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff839de8c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:169 intr_handler(ffff80002ffdaab0,ffff80000007aa00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge18_untramp() at Xintr_ioapic_edge18_untramp+0x18f __mp_lock(ffffffff839de8c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff839de8c0) at __mp_lock+0x192 sys/kern/kern_lock.c:169 __mp_acquire_count(ffffffff839de8c0,2) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 cond_wait(ffff80002ffdaccc,ffffffff833b6792) at cond_wait+0x7b sys/kern/kern_synch.c:997 smr_barrier_impl(0) at smr_barrier_impl+0x102 sys/kern/kern_smr.c:295 if_idxmap_remove(ffff800001493800) at if_idxmap_remove+0x11b if_put sys/net/if.c:-1 [inline] if_idxmap_remove(ffff800001493800) at if_idxmap_remove+0x11b sys/net/if.c:479 if_detach(ffff800001493800) at if_detach+0xfa if_remove sys/net/if.c:1160 [inline] if_detach(ffff800001493800) at if_detach+0xfa sys/net/if.c:1208 end trace frame: 0xffff80002ffdae00, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837d6ff0) 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(ffffffff839de8c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff839de8c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:169 intr_handler(ffff80002ffdaab0,ffff80000007aa00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge18_untramp() at Xintr_ioapic_edge18_untramp+0x18f __mp_lock(ffffffff839de8c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:138 [inline] __mp_lock(ffffffff839de8c0) at __mp_lock+0x192 sys/kern/kern_lock.c:169 __mp_acquire_count(ffffffff839de8c0,2) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 cond_wait(ffff80002ffdaccc,ffffffff833b6792) at cond_wait+0x7b sys/kern/kern_synch.c:997 smr_barrier_impl(0) at smr_barrier_impl+0x102 sys/kern/kern_smr.c:295 if_idxmap_remove(ffff800001493800) at if_idxmap_remove+0x11b if_put sys/net/if.c:-1 [inline] if_idxmap_remove(ffff800001493800) at if_idxmap_remove+0x11b sys/net/if.c:479 if_detach(ffff800001493800) at if_detach+0xfa if_remove sys/net/if.c:1160 [inline] if_detach(ffff800001493800) at if_detach+0xfa sys/net/if.c:1208 pppacclose(637d,1,2000,ffff80003c002020) at pppacclose+0x118 sys/net/if_pppx.c:1329 spec_close(ffff80002ffdae80) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8062670138,1,fffffd80097fb548,ffff80003c002020) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c0fdd60,ffff80003c002020) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c0fdd60,ffff80003c002020) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c0fdd60,ffff80003c002020) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c0fdd60,ffff80003c002020) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c002020) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c002020,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c002020,ffff80002ffdb1f0,ffff80002ffdb140) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ffdb1f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ffdb1f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x73350b849dd0, count: -25 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(ffffffff833977e1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d54da,ffffffff833e5e43,3b9,ffffffff8340fba7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44b4e8,ffffffff83390e87) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44b4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c002d18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff2e90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f23c510,41,fffffd80097fb548,ffff80003c002d18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8061d7d240,ffff80003c002d18) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8061d7d240,ffff80003c002d18) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c002d18) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c002d18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c002d18,ffff800039ff3200,ffff800039ff3150) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800039ff31f0, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833977e1) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d54da,ffffffff833e5e43,3b9,ffffffff8340fba7) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c44b4e8,ffffffff83390e87) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c44b4e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff80003c002d18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800039ff2e90) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805f23c510,41,fffffd80097fb548,ffff80003c002d18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8061d7d240,ffff80003c002d18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8061d7d240,ffff80003c002d18) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8061d7d240,ffff80003c002d18) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c002d18) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c002d18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c002d18,ffff800039ff3200,ffff800039ff3150) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800039ff3200) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800039ff3200) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d44dc66dac0, count: -16