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(ffffffff833962ae) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d23e4,ffffffff833e3947,3b9,ffffffff8340d639) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c477510,ffffffff8338af85) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c477508) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff800030feafb8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c01c970) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800b92aeb8,41,fffffd80097fb5b0,ffff800030feafb8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf9aee8,ffff800030feafb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bf9aee8,ffff800030feafb8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800030feafb8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800030feafb8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800030feafb8,ffff80003c01cce0,ffff80003c01cc30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c01ccd0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 953 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833962ae) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d23e4,ffffffff833e3947,3b9,ffffffff8340d639) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c477510,ffffffff8338af85) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c477508) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff800030feafb8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c01c970) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800b92aeb8,41,fffffd80097fb5b0,ffff800030feafb8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf9aee8,ffff800030feafb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bf9aee8,ffff800030feafb8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800030feafb8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800030feafb8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800030feafb8,ffff80003c01cce0,ffff80003c01cc30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c01cce0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c01cce0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x742eb6b4a290, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c01c740 rbx 0xffffffff83828ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff800030feafb8 rax 0xffffffff83827ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xfd145dea5a8926e8 r11 0xb2eefa3db92b3b1f r12 0xffffffff83828be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff810a1865 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c01c730 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=516417 pid=81519 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800030feafb8 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800030fe87e8,0xffff800030fead30 process=0xffff800038c0f9e8 user=0xffff80003c017000, vmspace=0xfffffd806bf75d78 estcpu=33, cpticks=4, pctcpu=0.3, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31587 455889 30611 0 2 0 syz-executor 97910 185844 93443 0 2 0 syz-executor 97910 515552 93443 0 2 0x4000000 syz-executor 63190 121550 9840 0 2 0 syz-executor 63190 155053 9840 0 3 0x4000080 kqsel syz-executor 63190 444655 9840 0 3 0x4000000 smrbar syz-executor 14593 417549 26110 0 2 0 syz-executor 14593 394724 26110 0 2 0x4000000 syz-executor 14593 19658 26110 0 3 0x4000000 fltagain2 syz-executor 14593 428059 26110 0 3 0x4000080 pipeiolk syz-executor 14593 503648 26110 0 3 0x4000000 pipecl syz-executor 32243 125536 13124 0 2 0 syz-executor 32243 520829 13124 0 3 0x4000080 fsleep syz-executor 62171 78940 0 0 3 0x14200 acct acct 79848 301364 91632 0 3 0x82 wait syz-executor 13815 144638 1 0 3 0x100083 ttyin getty 37675 512909 91632 0 3 0x82 nanoslp syz-executor 30611 504831 91632 0 2 0xc82 syz-executor 93443 52206 91632 0 3 0x82 nanoslp syz-executor 44086 407544 0 0 3 0x14280 nfsidl nfsio 25909 100329 0 0 3 0x14280 nfsidl nfsio 58646 213639 0 0 3 0x14280 nfsidl nfsio 71919 510053 0 0 3 0x14280 nfsidl nfsio 13124 311266 91632 0 3 0x82 nanoslp syz-executor 6972 359621 25085 0 3 0x100082 sbwait ndp 25085 281657 1 0 3 0x10008a sigsusp sh 42322 524282 91632 0 2 0x2 syz-executor 26110 7982 91632 0 3 0x82 nanoslp syz-executor 9840 428214 91632 0 3 0x82 nanoslp syz-executor 91632 347734 58324 0 3 0x82 kqread syz-executor 58324 346860 75335 0 3 0x10008a sigsusp ksh 75335 30356 19936 0 3 0x98 kqread sshd-session 19936 69402 65586 0 3 0x92 kqread sshd-session 65586 375512 1 0 3 0x88 kqread sshd 55909 438695 49096 74 3 0x1100092 bpf pflogd 49096 343203 1 0 3 0x80 sbwait pflogd 128 50908 80501 73 3 0x1100090 kqread syslogd 80501 321628 1 0 3 0x100082 sbwait syslogd 78194 458545 1 0 3 0x100080 kqread resolvd 94417 104478 75731 77 3 0x100092 kqread dhcpleased 11790 392825 75731 77 3 0x100092 kqread dhcpleased 75731 29892 1 0 3 0x80 kqread dhcpleased 4266 413085 0 0 3 0x14200 bored smr 42159 18410 0 0 2 0x14200 zerothread 66549 235074 0 0 3 0x14200 aiodoned aiodoned 69897 445510 0 0 3 0x14200 syncer update 15902 205390 0 0 3 0x14200 cleaner cleaner 55969 158637 0 0 3 0x14200 reaper reaper 71038 165001 0 0 3 0x14200 pgdaemon pagedaemon 26743 49965 0 0 3 0x14200 bored viomb 70384 458551 0 0 3 0x40014200 acpi0 acpi0 81332 289557 0 0 7 0x40014200 idle1 21904 169666 0 0 3 0x14200 bored softnet1 76090 313904 0 0 3 0x14200 bored softnet0 80137 369364 0 0 3 0x14200 bored systqmp 78460 348469 0 0 3 0x14200 bored systq 11559 500229 0 0 3 0x14200 tmoslp softclockmp 96479 516500 0 0 3 0x40014200 tmoslp softclock 48844 194358 0 0 3 0x40014200 idle0 1 28128 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 14593 (syz-executor) thread 0xffff80002a291ca0 (394724) exclusive rrwlock inode r = 0 (0xfffffd807d189908) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 Process 42322 (syz-executor) thread 0xffff80002a2907e0 (524282) exclusive rrwlock inode r = 0 (0xfffffd807d189c80) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c92d6a0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xa3 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10243 11036K 12361K 166960K 13433 0 pcb 17 18K 32K 166960K 903 0 rtable 230 12K 13K 166960K 1021 0 pf 40 18K 67486K 166960K 265 0 ifaddr 41 7K 9K 166960K 201 0 ifgroup 58 2K 2K 166960K 307 0 sysctl 4 1K 9K 166960K 31 0 counters 74 37K 38K 166960K 506 0 ioctlops 0 0K 4K 166960K 2321 0 iov 0 0K 24K 166960K 163 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1528 96K 97K 166960K 3679 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 32 0 VM map 2 1K 1K 166960K 2 0 sem 24 2K 2K 166960K 46 0 dirhash 12 2K 3K 166960K 63 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 248K 166960K 2801 0 sigio 0 0K 0K 166960K 137 0 proc 73 115K 164K 166960K 1067 0 subproc 81 5K 5K 166960K 174 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 332 0 in_multi 74 5K 7K 166960K 350 0 ether_multi 1 0K 0K 166960K 32 0 mrt 1 0K 0K 166960K 27 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 289 1288K 1288K 166960K 289 0 exec 0 0K 1K 166960K 982 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 266 163K 183K 166960K 25830 0 UVM aobj 8 2K 2K 166960K 9 0 pinsyscall 45 90K 102K 166960K 4131 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 188 0 NDP 13 0K 2K 166960K 134 0 temp 113 8660K 8916K 166960K 176485 0 kqueue 14 22K 34K 166960K 532 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 482 0 478 7 6 1 3 0 8 0 rtentry 176 320 0 232 6 0 6 6 0 8 0 unpcb 144 2325 0 2308 25 22 3 10 0 8 2 syncache 336 9 0 9 3 3 0 1 0 8 0 tcpcb 736 1245 0 1241 30 23 7 10 0 8 6 arp 136 41 0 24 1 0 1 1 0 8 0 inpcb 328 3760 0 3753 42 34 8 12 0 8 7 nd6 152 54 0 35 1 0 1 1 0 8 0 pkpcb 40 53 0 53 6 5 1 1 0 8 1 kcovpl 48 19 0 10 1 0 1 1 0 8 0 mppekey 1024 3 0 3 3 2 1 1 0 8 1 ppxss 1192 186 0 183 2 1 1 1 0 8 0 pppxif 1504 18 0 17 6 5 1 1 0 8 0 pfstscr 40 3 0 3 2 2 0 1 0 8 0 pffrag 232 57 0 49 1 0 1 1 0 482 0 pffrnode 88 35 0 29 1 0 1 1 0 8 0 pffrent 40 101 0 93 1 0 1 1 0 8 0 pfosfp 40 1431 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1431 0 714 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfstitem 24 199 0 113 1 0 1 1 0 8 0 pfstkey 128 202 0 116 4 0 4 4 0 8 0 pfstate 384 202 0 116 10 0 10 10 0 8 0 pfrule 1344 32 0 27 2 1 1 2 0 8 0 rttmr 136 5 0 5 5 4 1 1 0 8 1 art_heap8 4096 6 0 2 6 2 4 5 0 8 0 art_heap4 256 1496 0 1109 43 11 32 32 0 8 5 art_table 40 1502 0 1111 6 0 6 6 0 8 1 art_node 32 320 0 244 1 0 1 1 0 8 0 sysvmsgpl 40 19 0 11 1 0 1 1 0 8 0 semapl 112 38 0 16 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 51 0 34 3 0 3 3 0 8 0 dino2pl 256 6683 0 5157 96 0 96 96 0 8 0 ffsino 296 6683 0 5157 119 0 119 119 0 8 0 nchpl 144 10522 0 8791 65 0 65 65 0 8 0 rtmask 32 15 0 15 6 6 0 1 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 39016 0 39015 3 2 1 2 0 8 0 percpumem 16 268 0 216 1 0 1 1 0 8 0 kstatmem 264 190 0 160 5 2 3 3 0 8 0 scsiplug 72 11 0 11 9 8 1 1 0 8 1 scxspl 216 64101 0 64101 21 20 1 8 1 8 1 plimitpl 152 716 0 696 1 0 1 1 0 8 0 sigapl 424 3057 0 3003 7 0 7 7 0 8 0 knotepl 120 634 0 0 18 0 18 18 0 8 0 kqueuepl 224 1056 0 1043 11 9 2 5 0 8 1 pipepl 344 623 0 592 13 9 4 9 0 8 0 fdescpl 528 3028 0 2995 3 0 3 3 0 8 0 filepl 160 23406 0 23169 45 31 14 23 0 8 1 lockfpl 104 842 0 839 1 0 1 1 0 8 0 lockfspl 48 335 0 332 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 190 0 172 1 0 1 1 0 8 0 ucredpl 104 4239 0 4226 1 0 1 1 0 8 0 zombiepl 144 3005 0 3003 2 1 1 1 0 8 0 processpl 1232 3057 0 3003 6 1 5 5 0 8 0 procpl 664 6960 0 6898 7 1 6 7 0 8 0 sosppl 176 11 0 11 6 5 1 1 0 8 1 sockpl 752 6795 0 6767 85 74 11 35 0 8 8 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 112 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 56 0 0 7 0 7 7 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 1787 0 0 112 0 112 112 0 8 0 bufpl 280 23029 0 16892 439 0 439 439 0 8 0 anonpl 32 24093 0 0 194 0 194 194 0 246 0 amapchunkpl 152 88744 0 88114 66 30 36 39 0 158 6 amappl16 200 12592 0 11714 116 57 59 60 0 8 0 amappl15 192 85 0 85 1 1 0 1 0 8 0 amappl14 184 15 0 14 1 0 1 1 0 8 0 amappl13 176 542 0 539 1 0 1 1 0 8 0 amappl12 168 3501 0 3455 3 0 3 3 0 8 0 amappl11 160 8 0 8 2 2 0 1 0 8 0 amappl10 152 48 0 33 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 47 0 42 1 0 1 1 0 8 0 amappl7 128 118 0 117 1 0 1 1 0 8 0 amappl6 120 384 0 368 1 0 1 1 0 8 0 amappl5 112 74 0 63 1 0 1 1 0 8 0 amappl4 104 479 0 448 1 0 1 1 0 8 0 amappl3 96 15876 0 15780 4 1 3 3 0 8 0 amappl2 88 3140 0 3059 2 0 2 2 0 8 0 amappl1 80 21268 0 20643 16 0 16 16 0 8 0 amappl 88 24456 0 24276 5 0 5 5 0 92 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 dma65536 65536 3 0 3 3 3 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 66 0 66 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma512 512 3 0 3 2 2 0 1 0 8 0 dma256 256 9 0 9 3 3 0 1 0 8 0 dma128 128 256 0 256 4 3 1 1 0 8 1 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 21 0 20 1 0 1 1 0 8 0 aobjpl 72 8 0 1 1 0 1 1 0 8 0 uaddrrnd 24 3028 0 2995 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3028 0 2995 1 0 1 1 0 8 0 vmmpekpl 168 22837 0 22781 3 0 3 3 0 8 0 vmmpepl 168 197423 0 194538 183 38 145 155 0 357 8 vmsppl 488 3027 0 2995 5 0 5 5 0 8 0 rwobjpl 80 57513 0 49740 170 5 165 165 0 8 0 pdppl 4096 6063 0 5990 123 48 75 81 0 8 2 pvpl 32 32441 0 0 263 2 261 261 0 265 0 pmappl 256 3027 0 2995 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 464 0 103 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833962ae) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833d23e4,ffffffff833e3947,3b9,ffffffff8340d639) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c477510,ffffffff8338af85) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(285b9a,ffff80003c477508) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(285b9a,41,2000,ffff800030feafb8) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c01c970) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd800b92aeb8,41,fffffd80097fb5b0,ffff800030feafb8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806bf9aee8,ffff800030feafb8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806bf9aee8,ffff800030feafb8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806bf9aee8,ffff800030feafb8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800030feafb8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800030feafb8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800030feafb8,ffff80003c01cce0,ffff80003c01cc30) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c01cce0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c01cce0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x742eb6b4a290, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5