panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 311987 78475 0 0x14000 0x200 0 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346de2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417966,ffffffff8341da2f,3b7,ffffffff8341dab2) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034fe7500,ffffffff8335ff49) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034fe74f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff800037ff59d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a3b5810) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e59f440,1,fffffd80097fb208,ffff800037ff59d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fe73208,ffff800037ff59d0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806fe73208,ffff800037ff59d0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff800037ff59d0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff800037ff59d0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff800037ff59d0,ffff80002a3b5b80,ffff80002a3b5ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a3b5b70, 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 951 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346de2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417966,ffffffff8341da2f,3b7,ffffffff8341dab2) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034fe7500,ffffffff8335ff49) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034fe74f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff800037ff59d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a3b5810) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e59f440,1,fffffd80097fb208,ffff800037ff59d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fe73208,ffff800037ff59d0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806fe73208,ffff800037ff59d0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff800037ff59d0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff800037ff59d0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff800037ff59d0,ffff80002a3b5b80,ffff80002a3b5ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3b5b80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b5b80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:732 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x762972fa9450, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a3b55e0 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff800037ff59d0 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x38ff7fa31ff91e44 r11 0x7d83549fff89e6ee r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81d88c15 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3b55d0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=124767 pid=19590 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=83, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff800037ff59d0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff800037ff4f90,0xffff800037ff5750 process=0xffff80002a277a30 user=0xffff80002a3b0000, vmspace=0xfffffd805e299b70 estcpu=33, cpticks=4, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96153 490711 97354 0 3 0x3000 suspend syz-executor 96153 364807 97354 0 2 0x4081000 syz-executor 22541 238238 64020 0 2 0 syz-executor 22541 16250 64020 0 3 0x4000000 smrbar syz-executor 22541 391303 64020 0 3 0x4000080 fsleep syz-executor 49570 188775 51499 0 3 0x80 nanoslp syz-executor 49570 401098 51499 0 3 0x4000080 sbwait syz-executor 49570 159609 51499 0 3 0x4000080 fsleep syz-executor 80849 332245 62801 0 2 0 syz-executor 80849 254578 62801 0 3 0x4000000 smrbar syz-executor 97354 492908 4367 0 3 0x82 nanoslp syz-executor 3264 215769 4367 0 3 0x82 nanoslp syz-executor 73402 23038 0 0 3 0x14200 acct acct 46850 505775 1 0 3 0x80 fsleep syz-executor 46850 412576 1 0 3 0x4000080 ttyin syz-executor 46850 219550 1 0 3 0x4000000 inode syz-executor 46850 22478 1 0 3 0x4000000 inode syz-executor 51499 205241 4367 0 3 0x82 nanoslp syz-executor 13024 452914 1 0 3 0x100083 ttyopn getty 14977 393737 0 0 3 0x14200 bored sosplice 5831 411831 4367 0 3 0x82 piperd syz-executor 64020 348414 4367 0 3 0x82 nanoslp syz-executor 32813 233923 4367 0 3 0x82 piperd syz-executor 62801 460719 4367 0 3 0x82 nanoslp syz-executor 4367 61718 18420 0 3 0x82 nanoslp syz-executor 18420 24528 47102 0 3 0x10008a sigsusp ksh 47102 146058 3243 0 3 0x98 kqread sshd-session 3243 23324 54185 0 3 0x92 kqread sshd-session 54185 513548 1 0 3 0x88 kqread sshd 55928 500854 96916 74 3 0x1100092 bpf pflogd 96916 30109 1 0 3 0x80 sbwait pflogd 87234 253862 49603 73 3 0x1100090 kqread syslogd 49603 6858 1 0 3 0x100082 sbwait syslogd 12675 357083 1 0 3 0x100080 kqread resolvd 7268 360628 69904 77 3 0x100092 kqread dhcpleased 52287 215313 69904 77 3 0x100092 kqread dhcpleased 69904 211865 1 0 3 0x80 kqread dhcpleased 75249 478935 0 0 3 0x14200 bored smr 17767 222326 0 0 2 0x14200 zerothread 76933 421665 0 0 3 0x14200 aiodoned aiodoned 54573 132758 0 0 3 0x14200 syncer update 21306 5946 0 0 3 0x14200 cleaner cleaner 78475 311987 0 0 7 0x14200 reaper 1888 452957 0 0 3 0x14200 pgdaemon pagedaemon 25171 260202 0 0 3 0x14200 bored viomb 63677 330022 0 0 3 0x40014200 acpi0 acpi0 56544 66190 0 0 3 0x40014200 idle1 31524 367847 0 0 3 0x14200 bored softnet3 13382 266362 0 0 3 0x14200 bored softnet2 75429 135138 0 0 3 0x14200 bored softnet1 54523 96915 0 0 3 0x14200 bored softnet0 91501 460695 0 0 3 0x14200 bored systqmp 82046 93914 0 0 3 0x14200 bored systq 85655 84191 0 0 3 0x14200 tmoslp softclockmp 92455 438500 0 0 3 0x40014200 tmoslp softclock 54442 9164 0 0 3 0x40014200 idle0 1 83514 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 46850 (syz-executor) thread 0xffff80003bc174a8 (412576) exclusive rrwlock inode r = 0 (0xfffffd806e0eff50) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 spec_open+0x305 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x708 sys/kern/vfs_vnops.c:177 #8 vndioctl+0xcb1 sys/dev/vnd.c:457 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #11 sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 #12 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:732 #13 Xsyscall+0x128 Process 46850 (syz-executor) thread 0xffff80003bc17218 (219550) exclusive rrwlock inode r = 0 (0xfffffd8063bed9a0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1864 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:732 #9 Xsyscall+0x128 Process 78475 (reaper) thread 0xffff8000ffffcf68 (311987) exclusive rwlock kmmaplk r = 0 (0xffffffff839ba330) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168 #3 uvm_unmap+0x81 sys/uvm/uvm_map.c:1792 #4 km_free+0x87 sys/uvm/uvm_km.c:831 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:285 #6 reaper+0x1cb sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10257 11070K 11749K 166960K 14449 0 pcb 17 12K 12K 166960K 230 0 rtable 205 18K 19K 166960K 670 0 pf 48 20K 83K 166960K 254 0 ifaddr 43 7K 8K 166960K 142 0 ifgroup 66 2K 3K 166960K 238 0 sysctl 4 1K 9K 166960K 47 0 counters 80 38K 38K 166960K 274 0 ioctlops 0 0K 4K 166960K 1741 0 iov 0 0K 32K 166960K 102 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1472 93K 93K 166960K 3473 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 32 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 66 0 dirhash 12 2K 3K 166960K 48 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 15 53K 89K 166960K 1748 0 sigio 0 0K 0K 166960K 93 0 proc 73 91K 128K 166960K 789 0 subproc 72 4K 5K 166960K 162 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 386 0 in_multi 75 5K 7K 166960K 195 0 ether_multi 1 0K 0K 166960K 16 0 mrt 1 0K 0K 166960K 15 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 696 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 224 159K 176K 166960K 17697 0 UVM aobj 121 6K 6K 166960K 122 0 pinsyscall 40 80K 100K 166960K 3004 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 77 0 NDP 15 0K 2K 166960K 95 0 temp 80 8696K 8770K 166960K 93100 0 kqueue 16 26K 30K 166960K 364 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 120 141 0 137 1 0 1 1 0 8 0 rtentry 176 202 0 121 6 1 5 6 0 8 0 unpcb 144 1183 0 1164 9 8 1 6 0 8 0 syncache 336 9 0 9 4 4 0 1 0 8 0 tcpcb 736 591 0 587 15 11 4 7 0 8 3 arp 128 33 0 19 1 0 1 1 0 8 0 inpcb 328 1670 0 1661 17 13 4 7 0 8 3 nd6 144 43 0 21 1 0 1 1 0 8 0 pkpcb 40 43 0 43 4 3 1 1 0 8 1 kcovpl 48 18 0 10 1 0 1 1 0 8 0 ppxss 1192 77 0 73 3 2 1 1 0 8 0 pppxif 1504 15 0 14 4 3 1 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 10 0 5 1 0 1 1 0 482 0 pffrnode 88 8 0 4 1 0 1 1 0 8 0 pffrent 40 20 0 15 1 0 1 1 0 8 0 pfosfp 40 1430 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1430 0 715 21 0 21 21 0 8 0 pfrktable 1344 14 0 13 2 1 1 1 0 8 0 pfanchor 1288 7 0 4 2 1 1 1 0 8 0 pftag 88 7 0 4 2 1 1 1 0 8 0 pfstitem 24 136 0 41 1 0 1 1 0 8 0 pfstkey 128 139 0 45 4 0 4 4 0 8 0 pfstate 384 135 0 43 10 0 10 10 0 8 0 pfrule 1344 38 0 26 3 1 2 2 0 8 0 rttmr 136 5 0 5 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 904 0 556 33 8 25 29 0 8 2 art_table 32 905 0 556 4 0 4 4 0 8 0 art_node 16 198 0 125 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 5 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 60 0 50 1 0 1 1 0 8 0 shmpl 112 119 0 1 4 0 4 4 0 8 0 dirhash 1024 41 0 24 3 0 3 3 0 8 0 dino2pl 256 4710 0 3183 97 1 96 96 0 8 0 ffsino 288 4710 0 3183 110 0 110 110 0 8 0 nchpl 144 7087 0 5376 64 0 64 64 0 8 0 rtmask 32 14 0 12 5 4 1 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 24866 0 24864 2 1 1 2 0 8 0 percpumem 16 152 0 97 1 0 1 1 0 8 0 pfiaddrpl 120 4 0 4 2 2 0 1 0 8 0 kstatmem 264 148 0 112 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 8 0 8 4 3 1 1 0 8 1 scxspl 216 48658 0 48658 11 10 1 8 1 8 1 plimitpl 152 359 0 342 1 0 1 1 0 8 0 sigapl 424 2051 0 2002 7 1 6 7 0 8 0 knotepl 120 580 0 0 17 0 17 17 0 8 0 kqueuepl 224 663 0 649 8 5 3 3 0 8 2 pipepl 336 380 0 352 13 5 8 8 0 8 5 fdescpl 520 2027 0 1998 3 0 3 3 0 8 0 filepl 160 13713 0 13494 28 8 20 20 0 8 8 lockfpl 104 1233 0 1231 4 3 1 2 0 8 0 lockfspl 48 430 0 428 1 0 1 1 0 8 0 sessionpl 144 36 0 27 1 0 1 1 0 8 0 pgrppl 48 82 0 65 1 0 1 1 0 8 0 ucredpl 104 2406 0 2391 1 0 1 1 0 8 0 zombiepl 144 2004 0 2002 1 0 1 1 0 8 0 processpl 1240 2051 0 2002 5 0 5 5 0 8 0 procpl 656 4687 0 4629 8 1 7 7 0 8 1 srpgc 96 14 0 14 3 2 1 1 0 8 1 sosppl 168 5 0 5 3 3 0 1 0 8 0 sockpl 728 3110 0 3078 34 27 7 16 0 8 3 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 43 0 0 5 0 5 5 0 8 0 mtagpl 96 89 0 0 3 0 3 3 0 8 0 mbufpl 256 321 0 0 19 0 19 19 0 8 0 bufpl 280 20854 0 14712 440 0 440 440 0 8 0 anonpl 32 14387 0 0 116 0 116 116 0 246 0 amapchunkpl 152 59321 0 58875 47 21 26 32 0 158 5 amappl16 200 8624 0 8588 46 31 15 34 0 8 8 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 136 0 124 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 2765 0 2736 3 1 2 2 0 8 0 amappl11 160 128 0 114 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 244 0 244 1 1 0 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 126 0 113 1 0 1 1 0 8 0 amappl6 120 232 0 227 1 0 1 1 0 8 0 amappl5 112 146 0 136 1 0 1 1 0 8 0 amappl4 104 377 0 355 1 0 1 1 0 8 0 amappl3 96 11886 0 11782 5 1 4 4 0 8 0 amappl2 88 758 0 695 2 0 2 2 0 8 0 amappl1 80 16482 0 15891 17 2 15 15 0 8 0 amappl 88 16629 0 16476 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 3 0 3 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 2 2 0 1 0 8 0 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 72 121 0 1 3 0 3 3 0 8 0 uaddrrnd 24 2027 0 1998 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2027 0 1998 1 0 1 1 0 8 0 vmmpekpl 168 17225 0 17158 3 0 3 3 0 8 0 vmmpepl 168 134147 0 132242 121 18 103 117 0 357 4 vmsppl 480 2026 0 1998 7 2 5 5 0 8 0 rwobjpl 72 43238 0 36267 132 0 132 132 0 8 2 pdppl 4096 4061 0 3996 115 42 73 83 0 8 8 pvpl 32 22123 0 0 179 0 179 179 0 265 0 pmappl 256 2026 0 1998 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 446 0 78 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8382dff0) 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(ffffffff8391e998) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391e998) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 mtx_enter_try(ffffffff83849d10) at mtx_enter_try+0x41 sys/kern/kern_lock.c:287 mtx_enter(ffffffff83849d10) at mtx_enter+0x62 sys/kern/kern_lock.c:261 msleep_nsec(ffffffff83849d48,ffffffff83849d10,4,ffffffff833ebc0f,ffffffffffffffff) at msleep_nsec+0x2f1 sys/kern/kern_synch.c:209 reaper(ffff8000ffffcf68) at reaper+0x14b sys/kern/kern_exit.c:477 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8382dff0) 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(ffffffff8391e998) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff8391e998) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 mtx_enter_try(ffffffff83849d10) at mtx_enter_try+0x41 sys/kern/kern_lock.c:287 mtx_enter(ffffffff83849d10) at mtx_enter+0x62 sys/kern/kern_lock.c:261 msleep_nsec(ffffffff83849d48,ffffffff83849d10,4,ffffffff833ebc0f,ffffffffffffffff) at msleep_nsec+0x2f1 sys/kern/kern_synch.c:209 reaper(ffff8000ffffcf68) at reaper+0x14b sys/kern/kern_exit.c:477 end trace frame: 0x0, count: -11 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(ffffffff8346de2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417966,ffffffff8341da2f,3b7,ffffffff8341dab2) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034fe7500,ffffffff8335ff49) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034fe74f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff800037ff59d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a3b5810) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e59f440,1,fffffd80097fb208,ffff800037ff59d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fe73208,ffff800037ff59d0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806fe73208,ffff800037ff59d0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff800037ff59d0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff800037ff59d0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff800037ff59d0,ffff80002a3b5b80,ffff80002a3b5ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a3b5b70, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8346de2d) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417966,ffffffff8341da2f,3b7,ffffffff8341dab2) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff800034fe7500,ffffffff8335ff49) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(205b9a,ffff800034fe74f8) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff800037ff59d0) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002a3b5810) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805e59f440,1,fffffd80097fb208,ffff800037ff59d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fe73208,ffff800037ff59d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fe73208,ffff800037ff59d0) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806fe73208,ffff800037ff59d0) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff800037ff59d0) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff800037ff59d0,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff800037ff59d0,ffff80002a3b5b80,ffff80002a3b5ad0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3b5b80) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3b5b80) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:732 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x762972fa9450, count: -16