panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 959 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 8204 24902 0 0 0x1 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b9af4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9660,ffffffff83506d00,3bf,ffffffff8352f883) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000357964f8,ffffffff834b344e) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff8000357964f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800037bb9778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a2444c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa006b019710,81,fffffa00097fd548,ffff800037bb9778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa00765f2320,ffff800037bb9778) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa00765f2320,ffff800037bb9778) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800037bb9778) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800037bb9778,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800037bb9778,ffff80002a244830,ffff80002a244780) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a244820, 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 959 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834b9af4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9660,ffffffff83506d00,3bf,ffffffff8352f883) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000357964f8,ffffffff834b344e) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff8000357964f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800037bb9778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a2444c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa006b019710,81,fffffa00097fd548,ffff800037bb9778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa00765f2320,ffff800037bb9778) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa00765f2320,ffff800037bb9778) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800037bb9778) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800037bb9778,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sys_exit(ffff800037bb9778,ffff80002a244830,ffff80002a244780) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a244830) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a244830) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72df7e974c60, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a244280 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff800037bb9778 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x934bee344bb3e5fe r11 0x1fb30b996e7004d9 r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff811fa775 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a244270 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=271412 pid=24482 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800037bb9778 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800037bb9ca8,0xffff800035793500 process=0xffff80002a37e1c8 user=0xffff80002a23f000, vmspace=0xfffffa000b1cb5b8 estcpu=29, cpticks=9, pctcpu=0.8, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 92272 79147 46622 0 2 0 syz-executor 85304 341676 79689 0 2 0 syz-executor 85304 4202 79689 0 3 0x4000000 smrbar syz-executor 85304 300322 79689 0 3 0x4000080 fsleep syz-executor 37869 425740 1 0 3 0x82 nanoslp getty 24902 8204 20784 0 7 0x1 syz-executor 24902 282353 20784 0 3 0x4000080 fsleep syz-executor 24902 183222 20784 0 3 0x4000080 fsleep syz-executor 24902 158076 20784 0 3 0x4000080 fsleep syz-executor 82552 37493 61252 60929 2 0x10 syz-executor 82552 387818 61252 60929 3 0x4000090 fsleep syz-executor 82552 291224 61252 60929 3 0x4000090 fsleep syz-executor 82552 336750 61252 60929 3 0x4000090 fsleep syz-executor 20072 311335 0 0 3 0x14280 nfsidl nfsio 70173 519349 0 0 3 0x14280 nfsidl nfsio 81667 278428 0 0 3 0x14280 nfsidl nfsio 99684 478012 0 0 3 0x14280 nfsidl nfsio 71071 516312 0 0 3 0x14280 nfsidl nfsio 78537 382445 0 0 3 0x14280 nfsidl nfsio 24775 285384 0 0 3 0x14280 nfsidl nfsio 56040 505427 0 0 3 0x14280 nfsidl nfsio 33421 337790 0 0 3 0x14280 nfsidl nfsio 85984 312393 0 0 3 0x14280 nfsidl nfsio 78645 133680 0 0 3 0x14280 nfsidl nfsio 74628 171972 0 0 3 0x14280 nfsidl nfsio 47811 102667 0 0 3 0x14280 nfsidl nfsio 19496 276691 0 0 3 0x14280 nfsidl nfsio 64265 1612 0 0 3 0x14280 nfsidl nfsio 37703 174387 0 0 3 0x14280 nfsidl nfsio 54744 10462 0 0 3 0x14280 nfsidl nfsio 56412 489221 0 0 3 0x14280 nfsidl nfsio 12339 83496 0 0 3 0x14280 nfsidl nfsio 67943 60372 0 0 3 0x14280 nfsidl nfsio 13918 101015 28528 0 2 0x2 syz-executor 20784 113076 28528 0 3 0x82 nanoslp syz-executor 46622 95541 28528 0 3 0x82 nanoslp syz-executor 81300 173328 28528 0 2 0x2 syz-executor 11695 447999 28528 0 3 0x2 biowait syz-executor 81603 5885 28528 0 3 0x82 nanoslp syz-executor 79689 109669 28528 0 3 0x82 nanoslp syz-executor 61252 362324 28528 0 3 0x82 nanoslp syz-executor 28528 135573 1 0 2 0x2 syz-executor 97310 76818 0 0 3 0x14200 bored smr 3964 431214 0 0 2 0x14200 zerothread 53902 175477 0 0 3 0x14200 aiodoned aiodoned 6849 332364 0 0 3 0x14200 syncer update 42380 160462 0 0 3 0x14200 cleaner cleaner 35668 384293 0 0 3 0x14200 reaper reaper 85899 191992 0 0 3 0x14200 pgdaemon pagedaemon 56008 18185 0 0 3 0x14200 bored viomb 53341 143518 0 0 3 0x40014200 acpi0 acpi0 93153 126739 0 0 3 0x40014200 idle1 77690 390320 0 0 3 0x14200 bored softnet1 9514 393743 0 0 2 0x14200 softnet0 90661 297132 0 0 3 0x14200 bored systqmp 55761 505689 0 0 3 0x14200 bored systq 58539 19633 0 0 3 0x14200 tmoslp softclockmp 50415 17983 0 0 3 0x40014200 tmoslp softclock 66311 53599 0 0 3 0x40014200 idle0 1 166549 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 11695 (syz-executor) thread 0xffff80002a2227d8 (447999) exclusive rrwlock inode r = 0 (0xfffffa006f442450) #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+0xbd 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:150 #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:3062 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffa006d864c48) #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+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3047 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11056 12036K 12227K 166960K 12355 0 pcb 17 12K 12K 166960K 56 0 rtable 248 10K 10K 166960K 423 0 pf 47 20K 23K 166960K 113 0 ifaddr 47 8K 8K 166960K 57 0 ifgroup 60 2K 2K 166960K 74 0 sysctl 4 1K 9K 166960K 9 0 counters 74 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1559 0 iov 0 0K 16K 166960K 11 0 mount 1 1K 1K 166960K 1 0 log 2 0K 0K 166960K 6 0 vnodes 1293 81K 82K 166960K 1514 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 9K 166960K 7 0 VM map 2 1K 1K 166960K 2 0 sem 8 0K 0K 166960K 10 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 14 53K 89K 166960K 336 0 sigio 0 0K 0K 166960K 2 0 proc 24 49K 164K 166960K 587 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 18 0 in_multi 100 7K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 440 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 123 82K 176K 166960K 4950 0 UVM aobj 10 2K 4K 166960K 11 0 pinsyscall 17 34K 107K 166960K 1520 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 13 0 NDP 13 0K 1K 166960K 32 0 temp 41 9115K 9152K 166960K 9409 0 kqueue 1 2K 24K 166960K 60 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 120 109 0 109 2 0 2 2 0 8 2 rtentry 176 124 0 18 6 0 6 6 0 8 0 unpcb 144 372 0 372 6 0 6 6 0 8 6 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 104 0 102 6 0 6 6 0 8 5 arp 136 21 0 1 1 0 1 1 0 8 0 inpcb 328 342 0 339 6 0 6 6 0 8 4 nd6 152 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 3 0 2 1 0 1 1 0 8 0 pppxif 1576 3 0 2 1 0 1 1 0 8 0 pfstscr 40 6 0 4 2 1 1 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 1 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 10 0 5 1 0 1 1 0 8 0 pfsrclim 320 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 32 0 3 1 0 1 1 0 8 0 pfstkey 128 34 0 5 2 0 2 2 0 8 1 pfstate 448 31 0 3 4 0 4 4 0 8 0 pfrule 1360 31 0 16 2 0 2 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 493 0 74 31 0 31 31 0 8 3 art_table 40 495 0 74 5 0 5 5 0 8 0 art_node 32 124 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 2 1 0 1 1 0 8 0 semapl 72 8 0 2 1 0 1 1 0 8 0 shmpl 112 8 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1916 0 442 93 0 93 93 0 8 0 ffsino 296 1916 0 442 114 0 114 114 0 8 0 nchpl 144 2388 0 685 64 0 64 64 0 8 0 vnodes 216 2103 0 0 117 0 117 117 0 8 0 namei 1024 7638 0 7637 2 0 2 2 0 8 1 percpumem 16 57 0 5 1 0 1 1 0 8 0 pfiaddrpl 120 9 0 0 1 0 1 1 0 8 0 kstatmem 264 35 0 6 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 10050 0 10049 7 3 4 4 1 8 3 plimitpl 152 49 0 39 1 0 1 1 0 8 0 sigapl 424 681 0 628 7 0 7 7 0 8 0 knotepl 120 373 0 0 12 0 12 12 0 8 0 kqueuepl 224 132 0 130 5 0 5 5 0 8 4 pipepl 344 137 0 110 3 0 3 3 0 8 0 fdescpl 528 645 0 628 3 0 3 3 0 8 0 filepl 160 3309 0 3150 19 2 17 19 0 8 8 lockfpl 104 219 0 218 2 0 2 2 0 8 1 lockfspl 48 44 0 43 1 0 1 1 0 8 0 sessionpl 144 30 0 28 1 0 1 1 0 8 0 pgrppl 48 40 0 30 1 0 1 1 0 8 0 ucredpl 104 327 0 321 1 0 1 1 0 8 0 zombiepl 144 629 0 628 1 0 1 1 0 8 0 processpl 1232 681 0 628 5 0 5 5 0 8 0 procpl 664 1008 0 947 7 0 7 7 0 8 0 sosppl 176 2 0 2 1 0 1 1 0 8 1 sockpl 752 826 0 823 32 23 9 20 0 8 8 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 137 0 0 18 0 18 18 0 8 1 mcl2k2 2112 1 0 0 1 0 1 1 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 256 243 0 0 16 0 16 16 0 8 0 bufpl 272 4824 0 105 315 0 315 315 0 8 0 anonpl 32 6130 0 0 50 0 50 50 0 247 0 amapchunkpl 152 15041 0 14729 26 0 26 26 0 158 8 amappl16 200 1510 0 1492 5 2 3 4 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 442 0 442 1 0 1 1 0 8 1 amappl13 176 130 0 128 1 0 1 1 0 8 0 amappl12 168 896 0 880 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 66 0 66 1 0 1 1 0 8 1 amappl9 144 280 0 279 2 1 1 1 0 8 0 amappl8 136 199 0 199 1 0 1 1 0 8 1 amappl7 128 159 0 156 1 0 1 1 0 8 0 amappl6 120 175 0 174 1 0 1 1 0 8 0 amappl5 112 119 0 118 1 0 1 1 0 8 0 amappl4 104 293 0 291 1 0 1 1 0 8 0 amappl3 96 2812 0 2743 4 0 4 4 0 8 0 amappl2 88 555 0 544 2 0 2 2 0 8 0 amappl1 80 11432 0 11321 15 1 14 15 0 8 7 amappl 88 4116 0 4009 4 0 4 4 0 92 0 uvmvnodes 80 105 0 0 3 0 3 3 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 10 0 1 1 0 1 1 0 8 0 uaddrrnd 24 645 0 628 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 645 0 628 1 0 1 1 0 8 0 vmmpekpl 168 7120 0 7083 2 0 2 2 0 8 0 vmmpepl 168 49371 0 48628 87 1 86 87 0 357 43 vmsppl 488 644 0 628 5 1 4 5 0 8 0 rwobjpl 80 16444 0 16028 24 2 22 24 0 8 2 pdppl 4096 1297 0 1256 101 54 47 83 0 8 6 pvpl 32 10630 0 0 87 1 86 86 0 265 0 pmappl 256 644 0 628 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 607 0 57 16 0 16 16 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8392aff0) 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(ffffffff83af9c40) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 sys/kern/kern_lock.c:173 intr_handler(ffff800037bb1250,ffff8000002a2900) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 sys/kern/kern_lock.c:173 ktrsyscall(ffff800037bb5780,4a,18,ffff800037bb1500) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff800037bb5780,4a,18,ffff800037bb1500) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff800037bb1500) at syscall+0x305 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff800037bb1500) at syscall+0x305 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c251bd61fb0, count: 5 ddb{0}> trace x86_ipi_db(ffffffff8392aff0) 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(ffffffff83af9c40) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 sys/kern/kern_lock.c:173 intr_handler(ffff800037bb1250,ffff8000002a2900) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83af9c40) at __mp_lock+0x199 sys/kern/kern_lock.c:173 ktrsyscall(ffff800037bb5780,4a,18,ffff800037bb1500) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff800037bb5780,4a,18,ffff800037bb1500) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff800037bb1500) at syscall+0x305 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff800037bb1500) at syscall+0x305 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c251bd61fb0, count: -10 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(ffffffff834b9af4) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834f9660,ffffffff83506d00,3bf,ffffffff8352f883) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff8000357964f8,ffffffff834b344e) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(205b9a,ffff8000357964f0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,81,2000,ffff800037bb9778) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a2444c0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa006b019710,81,fffffa00097fd548,ffff800037bb9778) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa00765f2320,ffff800037bb9778) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa00765f2320,ffff800037bb9778) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa00765f2320,ffff800037bb9778) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff800037bb9778) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff800037bb9778,0,0,1) at exit1+0x595 sys/kern/kern_exit.c:215 sy