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 45930 7044 0 0x40 0 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833730c8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0ea0,ffffffff833be472,3b9,ffffffff833e817d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c04af08,ffffffff83367449) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(205b92,ffff80003c04af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff800032008fb0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c045350) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c215a38,1,fffffd80097fb478,ffff800032008fb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7a2048,ffff800032008fb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7a2048,ffff800032008fb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800032008fb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800032008fb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032008fb0,ffff80003c0456c0,ffff80003c045610) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c0456b0, 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(ffffffff833730c8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0ea0,ffffffff833be472,3b9,ffffffff833e817d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c04af08,ffffffff83367449) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(205b92,ffff80003c04af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff800032008fb0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c045350) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c215a38,1,fffffd80097fb478,ffff800032008fb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7a2048,ffff800032008fb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7a2048,ffff800032008fb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800032008fb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800032008fb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032008fb0,ffff80003c0456c0,ffff80003c045610) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c0456c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c0456c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b5c34202570, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c045120 rbx 0xffffffff83829ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff800032008fb0 rax 0xffffffff83828ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x97fe8f37c112374d r11 0xb3d2db5738d44749 r12 0xffffffff83829be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff820856e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c045110 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=185653 pid=66232 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800032008fb0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800032009778,0xffff80003c4582d0 process=0xffff80003a025360 user=0xffff80003c040000, vmspace=0xfffffd806b9bab88 estcpu=36, cpticks=4, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7044 45930 82491 0 7 0x40 syz-executor 4786 161598 52488 0 2 0 syz-executor 29687 388434 52225 0 2 0 syz-executor 29687 273211 52225 0 3 0x4000080 fsleep syz-executor 29687 402699 52225 0 3 0x4000080 fsleep syz-executor 9237 240057 42395 0 2 0 syz-executor 9237 389802 42395 0 3 0x4000080 fsleep syz-executor 9237 453330 42395 0 2 0x4000000 syz-executor 9237 459067 42395 0 2 0x4000000 syz-executor 64284 20132 35660 0 2 0 syz-executor 64284 311223 35660 0 3 0x4000080 fsleep syz-executor 64284 317009 35660 0 3 0x4000080 fsleep syz-executor 64284 433157 35660 0 3 0x4000080 fsleep syz-executor 64226 206047 46526 0 4 0x82000 syz-executor 64226 254282 46526 0 3 0x4082000 smrbar syz-executor 64226 385033 46526 0 3 0x4002000 suspend syz-executor 81691 513431 54193 0 2 0 syz-executor 81691 360602 54193 0 3 0x4000080 fsleep syz-executor 81691 174286 54193 0 3 0x4000080 fsleep syz-executor 35660 38600 12941 0 3 0x82 nanoslp syz-executor 52488 296462 12941 0 3 0x82 nanoslp syz-executor 42395 25770 12941 0 3 0x82 nanoslp syz-executor 54193 133439 12941 0 2 0x2 syz-executor 82491 193215 12941 0 3 0x82 ppwait syz-executor 52225 293755 12941 0 2 0xc82 syz-executor 46526 481534 12941 0 3 0x82 nanoslp syz-executor 45031 284081 12941 0 3 0x82 nanoslp syz-executor 12941 419557 35500 0 3 0x82 kqread syz-executor 35500 476881 55763 0 3 0x10008a sigsusp ksh 55763 56598 33355 0 3 0x98 kqread sshd-session 33355 33666 14441 0 3 0x92 kqread sshd-session 52458 218976 1 0 3 0x100083 ttyin getty 14441 237527 1 0 3 0x88 kqread sshd 77589 217396 35410 74 3 0x1100092 bpf pflogd 35410 460931 1 0 3 0x80 sbwait pflogd 52338 417268 62578 73 3 0x1100090 kqread syslogd 62578 78567 1 0 3 0x100082 sbwait syslogd 51105 357586 1 0 3 0x100080 kqread resolvd 57403 142654 57553 77 3 0x100092 kqread dhcpleased 79575 490010 57553 77 3 0x100092 kqread dhcpleased 57553 505318 1 0 3 0x80 kqread dhcpleased 25372 241224 0 0 3 0x14200 bored smr 68116 472267 0 0 2 0x14200 zerothread 36019 188564 0 0 3 0x14200 aiodoned aiodoned 7361 178719 0 0 3 0x14200 syncer update 56287 215075 0 0 3 0x14200 cleaner cleaner 95849 221653 0 0 3 0x14200 reaper reaper 7087 100450 0 0 3 0x14200 pgdaemon pagedaemon 76097 190429 0 0 3 0x14200 bored viomb 82804 73959 0 0 3 0x40014200 acpi0 acpi0 45729 306619 0 0 3 0x40014200 idle1 33763 93713 0 0 3 0x14200 bored softnet7 58603 209926 0 0 3 0x14200 bored softnet6 78031 382256 0 0 3 0x14200 bored softnet5 80046 62860 0 0 3 0x14200 bored softnet4 56616 185418 0 0 3 0x14200 bored softnet3 51468 114907 0 0 3 0x14200 bored softnet2 96284 141274 0 0 3 0x14200 bored softnet1 56553 432254 0 0 3 0x14200 bored softnet0 9717 441778 0 0 3 0x14200 smrbar systqmp 70741 116682 0 0 3 0x14200 bored systq 29800 161331 0 0 2 0x14200 softclockmp 17308 75945 0 0 3 0x40014200 tmoslp softclock 98623 504927 0 0 3 0x40014200 idle0 1 204570 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 7044 (syz-executor) thread 0xffff80003c458d20 (45930) exclusive rwlock uobjlk r = 0 (0xfffffd806d813868) #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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1236 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1370 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806b9ba8b8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 Process 9237 (syz-executor) thread 0xffff8000320094e0 (453330) exclusive rrwlock inode r = 0 (0xfffffd806b764a20) #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_makeinode+0xcd sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167 #9 VOP_MKNOD+0x101 sys/kern/vfs_vops.c:121 #10 domknodat+0x469 sys/kern/vfs_syscalls.c:1640 #11 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b7640e0) #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 domknodat+0xb4 sys/kern/vfs_syscalls.c:1592 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 #9 Xsyscall+0x128 Process 9717 (systqmp) thread 0xffff8000ffffe298 (441778) shared rwlock systqmp r = 0 (0xffffffff83831aa8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 11025K 11052K 166960K 11298 0 pcb 19 12K 12K 166960K 27 0 rtable 209 6K 6K 166960K 259 0 pf 37 18K 18K 166960K 48 0 ifaddr 45 7K 7K 166960K 47 0 ifgroup 60 2K 2K 166960K 60 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1488 0 iov 0 0K 16K 166960K 2 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1342 84K 85K 166960K 1381 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 85K 166960K 169 0 sigio 0 0K 0K 166960K 4 0 proc 72 115K 180K 166960K 542 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 6 0 in_multi 100 7K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 1 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 363 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 239 151K 160K 166960K 3222 0 UVM aobj 7 2K 2K 166960K 8 0 pinsyscall 43 86K 100K 166960K 1242 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 15 0K 1K 166960K 29 0 temp 39 8639K 8705K 166960K 4040 0 kqueue 14 22K 26K 166960K 28 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 33 0 30 1 0 1 1 0 8 0 rtentry 176 96 0 1 5 0 5 5 0 8 0 unpcb 144 51 0 33 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 11 0 7 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 81 0 71 2 0 2 2 0 8 1 nd6 144 16 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 1 1 0 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 pfstitem 24 17 0 0 1 0 1 1 0 8 0 pfstkey 128 17 0 0 1 0 1 1 0 8 0 pfstate 384 17 0 0 2 0 2 2 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 443 0 0 28 0 28 28 0 8 0 art_table 40 444 0 0 5 0 5 5 0 8 0 art_node 32 96 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1621 0 108 95 0 95 95 0 8 0 ffsino 296 1621 0 108 117 0 117 117 0 8 0 nchpl 144 1857 0 169 63 0 63 63 0 8 0 uvmvnodes 80 1718 0 0 36 0 36 36 0 8 0 vnodes 216 1718 0 0 96 0 96 96 0 8 0 namei 1024 5661 0 5660 1 0 1 1 0 8 0 percpumem 16 52 0 1 1 0 1 1 0 8 0 kstatmem 264 28 0 0 2 0 2 2 0 8 0 scxspl 216 6635 0 6635 3 1 2 2 1 8 2 plimitpl 152 36 0 17 1 0 1 1 0 8 0 sigapl 424 471 0 417 7 0 7 7 0 8 0 knotepl 120 272 0 0 9 0 9 9 0 8 0 kqueuepl 224 30 0 19 1 0 1 1 0 8 0 pipepl 344 109 0 82 3 0 3 3 0 8 0 fdescpl 528 449 0 417 3 0 3 3 0 8 0 filepl 160 1598 0 1375 10 0 10 10 0 8 0 lockfpl 104 14 0 12 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 123 0 110 1 0 1 1 0 8 0 zombiepl 144 418 0 417 1 0 1 1 0 8 0 processpl 1232 471 0 417 5 0 5 5 0 8 0 procpl 664 542 0 476 6 0 6 6 0 8 0 sockpl 752 167 0 135 4 0 4 4 0 8 0 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 113 0 0 15 0 15 15 0 8 0 mcl2k 2048 28 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1133 0 0 71 0 71 71 0 8 0 bufpl 280 2913 0 122 200 0 200 200 0 8 0 anonpl 32 3977 0 0 33 0 33 33 0 246 0 amapchunkpl 152 9273 0 8780 23 2 21 21 0 158 2 amappl16 200 1961 0 1939 5 1 4 5 0 8 2 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 113 0 101 1 0 1 1 0 8 0 amappl13 176 46 0 46 1 1 0 1 0 8 0 amappl12 168 1083 0 1053 3 1 2 2 0 8 0 amappl11 160 48 0 34 1 0 1 1 0 8 0 amappl10 152 12 0 11 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 181 0 177 1 0 1 1 0 8 0 amappl5 112 120 0 111 1 0 1 1 0 8 0 amappl4 104 299 0 278 1 0 1 1 0 8 0 amappl3 96 1465 0 1354 4 1 3 3 0 8 0 amappl2 88 627 0 565 2 0 2 2 0 8 0 amappl1 80 8169 0 7561 14 0 14 14 0 8 0 amappl 88 2557 0 2391 4 0 4 4 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 449 0 417 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 449 0 417 1 0 1 1 0 8 0 vmmpekpl 168 5301 0 5267 2 0 2 2 0 8 0 vmmpepl 168 35130 0 33121 89 0 89 89 0 357 1 vmsppl 488 448 0 417 5 0 5 5 0 8 0 rwobjpl 80 14351 0 11694 56 1 55 56 0 8 0 pdppl 4096 906 0 834 94 20 74 82 0 8 2 pvpl 32 10413 0 0 84 0 84 84 0 265 0 pmappl 256 448 0 417 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 322 0 22 9 0 9 9 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(ffffffff833730c8) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b0ea0,ffffffff833be472,3b9,ffffffff833e817d) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c04af08,ffffffff83367449) at refcnt_finalize+0x1db sys/kern/kern_synch.c:954 pppx_if_destroy(205b92,ffff80003c04af00) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b92,1,2000,ffff800032008fb0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c045350) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806c215a38,1,fffffd80097fb478,ffff800032008fb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b7a2048,ffff800032008fb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b7a2048,ffff800032008fb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b7a2048,ffff800032008fb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800032008fb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800032008fb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800032008fb0,ffff80003c0456c0,ffff80003c045610) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c0456c0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c0456c0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b5c34202570, 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 __mp_lock(ffffffff8399e0e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8399e0e8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c02d460) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c02d460) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78750211a5d0, count: 9 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 __mp_lock(ffffffff8399e0e8) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8399e0e8) at __mp_lock+0x192 sys/kern/kern_lock.c:165 syscall(ffff80003c02d460) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] syscall(ffff80003c02d460) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78750211a5d0, count: -6