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 7269 50504 0 0 0x4000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373291) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b19bd,ffffffff833c1477,3b7,ffffffff833eb025) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3b3520,ffffffff83366975) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80002a3b3518) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003841c7f0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a3f59e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80728c39a8,2,fffffd80097fb750,ffff80003841c7f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806191fd90,ffff80003841c7f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806191fd90,ffff80003841c7f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003841c7f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003841c7f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003841c7f0,ffff80002a3f5d50,ffff80002a3f5ca0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002a3f5d40, 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 951 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83373291) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b19bd,ffffffff833c1477,3b7,ffffffff833eb025) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3b3520,ffffffff83366975) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80002a3b3518) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003841c7f0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a3f59e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80728c39a8,2,fffffd80097fb750,ffff80003841c7f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806191fd90,ffff80003841c7f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806191fd90,ffff80003841c7f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003841c7f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003841c7f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003841c7f0,ffff80002a3f5d50,ffff80002a3f5ca0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3f5d50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3f5d50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74a02d8452a0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a3f57b0 rbx 0xffffffff837a9ddf cpu_info_full_primary+0x2ddf rdx 0 rcx 0xffff80003841c7f0 rax 0xffffffff837a8ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xa4736d5f202f6792 r11 0x94975754f16b9e26 r12 0xffffffff837a9be0 cpu_info_full_primary+0x2be0 r13 0 r14 0 r15 0x1 rip 0xffffffff820653b5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a3f57a0 ss 0 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=210799 pid=79708 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003841c7f0 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003841cfb8,0xffff80002a35efd8 process=0xffff800038424020 user=0xffff80002a3f0000, vmspace=0xfffffd805afa0400 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14751 313204 49642 0 2 0 syz-executor 14751 224187 49642 0 3 0x4000080 fsleep syz-executor 33778 197883 72637 0 2 0 syz-executor 33778 276206 72637 0 3 0x4000080 fsleep syz-executor 50504 324168 38508 0 2 0 syz-executor 50504 7269 38508 0 7 0x4000000 syz-executor 77538 358092 14437 0 2 0xc80 syz-executor 77538 7357 14437 0 3 0x4000080 fsleep syz-executor 77538 434134 14437 0 3 0x4000080 fsleep syz-executor 35188 41585 63517 0 2 0xc80 syz-executor 35188 174119 63517 0 3 0x4000080 sbwait syz-executor 35188 337774 63517 0 3 0x4000080 fsleep syz-executor 5491 364117 95978 0 2 0x2 syz-executor 76896 34122 0 0 3 0x14200 acct acct 72637 497274 95978 0 2 0xc82 syz-executor 22851 90799 1 0 3 0x100083 ttyin getty 78081 384987 95978 0 3 0x82 wait syz-executor 38508 469871 95978 0 2 0xc82 syz-executor 67791 78686 0 0 3 0x14200 bored sosplice 63517 362336 95978 0 2 0xc82 syz-executor 49642 397301 95978 0 2 0xc82 syz-executor 14437 26340 95978 0 2 0xc82 syz-executor 25475 136532 95978 0 2 0xc82 syz-executor 95978 452707 82613 0 3 0x82 kqread syz-executor 82613 287237 93758 0 3 0x10008a sigsusp ksh 93758 142308 98664 0 3 0x98 kqread sshd-session 98664 357185 74522 0 3 0x92 kqread sshd-session 74522 160761 1 0 3 0x88 kqread sshd 4116 333089 51145 74 3 0x1100092 bpf pflogd 51145 409816 1 0 3 0x80 sbwait pflogd 34112 48133 85741 73 3 0x1100090 kqread syslogd 85741 186104 1 0 3 0x100082 sbwait syslogd 50005 54143 1 0 3 0x100080 kqread resolvd 34998 203134 2938 77 3 0x100092 kqread dhcpleased 33861 433656 2938 77 3 0x100092 kqread dhcpleased 2938 454883 1 0 3 0x80 kqread dhcpleased 98220 9781 0 0 3 0x14200 bored smr 86747 71444 0 0 2 0x14200 zerothread 32670 422493 0 0 3 0x14200 aiodoned aiodoned 66561 303873 0 0 3 0x14200 syncer update 45660 350660 0 0 3 0x14200 cleaner cleaner 44491 174485 0 0 3 0x14200 reaper reaper 99249 498058 0 0 3 0x14200 pgdaemon pagedaemon 60960 265451 0 0 3 0x14200 bored viomb 19550 477017 0 0 3 0x40014200 acpi0 acpi0 85617 288816 0 0 3 0x40014200 idle1 75428 391571 0 0 3 0x14200 bored softnet7 78334 507024 0 0 3 0x14200 bored softnet6 72874 70640 0 0 3 0x14200 bored softnet5 35551 233375 0 0 3 0x14200 bored softnet4 95902 484338 0 0 3 0x14200 bored softnet3 20470 421554 0 0 3 0x14200 bored softnet2 94770 142768 0 0 3 0x14200 bored softnet1 6459 91865 0 0 3 0x14200 bored softnet0 75738 71169 0 0 3 0x14200 smrbar systqmp 61049 287563 0 0 3 0x14200 bored systq 78456 479245 0 0 3 0x14200 tmoslp softclockmp 17099 19100 0 0 2 0x40014200 softclock 91643 65332 0 0 3 0x40014200 idle0 1 6827 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 5491 (syz-executor) thread 0xffff80002a35ed30 (364117) Process 75738 (systqmp) thread 0xffff8000ffffe530 (71169) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10256 11046K 13035K 166960K 13528 0 pcb 17 15K 16K 166960K 654 0 rtable 230 12K 12K 166960K 843 0 pf 41 18K 67486K 166960K 314 0 ifaddr 46 8K 9K 166960K 203 0 ifgroup 61 2K 3K 166960K 343 0 sysctl 4 1K 9K 166960K 25 0 counters 74 37K 38K 166960K 374 0 ioctlops 0 0K 4K 166960K 2067 0 iov 0 0K 32K 166960K 155 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1581 99K 100K 166960K 3815 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 27 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 89 0 dirhash 12 2K 2K 166960K 57 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 2911 0 sigio 0 0K 0K 166960K 71 0 proc 73 131K 164K 166960K 1007 0 subproc 72 4K 4K 166960K 138 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 407 0 in_multi 90 6K 7K 166960K 287 0 ether_multi 1 0K 0K 166960K 26 0 mrt 1 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 727 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 256 153K 171K 166960K 27484 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 42 84K 101K 166960K 4133 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 146 0 NDP 14 0K 2K 166960K 143 0 temp 82 8652K 8902K 166960K 196016 0 kqueue 15 24K 29K 166960K 494 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 120 298 0 295 3 2 1 2 0 8 0 rtentry 176 239 0 152 5 0 5 5 0 8 0 unpcb 144 2302 0 2284 21 19 2 6 0 8 1 syncache 336 8 0 8 6 6 0 1 0 8 0 tcpcb 736 752 0 748 17 10 7 7 0 8 6 arp 128 26 0 14 1 0 1 1 0 8 0 inpcb 328 2812 0 2803 31 21 10 12 0 8 8 nd6 144 48 0 28 1 0 1 1 0 8 0 pkpcb 40 48 0 48 7 6 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 122 0 120 4 3 1 1 0 8 0 pppxif 1504 18 0 17 8 7 1 1 0 8 0 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 26 0 15 1 0 1 1 0 482 0 pffrnode 88 25 0 14 1 0 1 1 0 8 0 pffrent 40 39 0 28 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 3 0 3 3 2 1 1 0 8 1 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 24 201 0 141 1 0 1 1 0 8 0 pfstkey 128 205 0 145 3 0 3 3 0 8 0 pfstate 384 202 0 142 8 0 8 8 0 8 0 pfrule 1344 31 0 26 2 1 1 2 0 8 0 rttmr 136 4 0 4 3 2 1 1 0 8 1 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1066 0 642 41 13 28 30 0 8 1 art_table 40 1071 0 642 5 0 5 5 0 8 0 art_node 32 238 0 163 1 0 1 1 0 8 0 sysvmsgpl 40 42 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 85 0 75 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 48 0 31 3 0 3 3 0 8 0 dino2pl 256 6988 0 5469 97 1 96 96 0 8 0 ffsino 296 6988 0 5469 118 0 118 118 0 8 0 nchpl 144 10887 0 9175 64 0 64 64 0 8 0 rtmask 32 16 0 16 6 6 0 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 39012 0 39012 3 1 2 2 0 8 2 percpumem 16 202 0 150 1 0 1 1 0 8 0 kstatmem 264 228 0 196 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 10 0 10 6 5 1 1 0 8 1 scxspl 216 104736 0 104736 19 16 3 8 1 8 3 plimitpl 152 902 0 885 1 0 1 1 0 8 0 sigapl 424 3163 0 3108 7 0 7 7 0 8 0 knotepl 120 644 0 0 18 0 18 18 0 8 0 kqueuepl 224 978 0 965 9 6 3 3 0 8 2 pipepl 344 476 0 448 13 7 6 9 0 8 3 fdescpl 528 3133 0 3102 3 0 3 3 0 8 0 filepl 160 22887 0 22667 34 18 16 19 0 8 3 lockfpl 104 1258 0 1256 2 1 1 2 0 8 0 lockfspl 48 547 0 545 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 83 0 66 1 0 1 1 0 8 0 ucredpl 104 4360 0 4347 1 0 1 1 0 8 0 zombiepl 144 3110 0 3108 2 1 1 1 0 8 0 processpl 1248 3163 0 3108 5 0 5 5 0 8 0 procpl 664 7451 0 7389 8 1 7 7 0 8 0 sosppl 168 10 0 10 6 5 1 1 0 8 1 sockpl 752 5592 0 5562 60 48 12 17 0 8 7 mcl64k 65536 21 0 0 3 1 2 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 66 0 0 7 0 7 7 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 1308 0 0 77 0 77 77 0 8 0 bufpl 280 46281 0 40138 440 0 440 440 0 8 0 anonpl 32 23477 0 0 191 2 189 190 0 246 0 amapchunkpl 152 94326 0 93681 69 35 34 36 0 158 6 amappl16 200 15931 0 15439 115 68 47 52 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 133 0 121 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 2 0 1 0 8 0 amappl12 168 3886 0 3855 4 2 2 3 0 8 0 amappl11 160 51 0 37 1 0 1 1 0 8 0 amappl10 152 23 0 23 2 2 0 1 0 8 0 amappl9 144 253 0 253 1 1 0 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 126 0 114 1 0 1 1 0 8 0 amappl6 120 251 0 248 1 0 1 1 0 8 0 amappl5 112 151 0 141 1 0 1 1 0 8 0 amappl4 104 310 0 291 1 0 1 1 0 8 0 amappl3 96 19312 0 19196 5 1 4 4 0 8 0 amappl2 88 757 0 691 2 0 2 2 0 8 0 amappl1 80 19695 0 19098 14 1 13 14 0 8 0 amappl 88 26277 0 26093 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 1 1 1 0 8 1 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 128 257 0 257 5 5 0 1 0 8 0 dma64 64 7 0 7 2 2 0 1 0 8 0 dma32 32 9 0 9 3 3 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 3133 0 3102 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3133 0 3102 1 0 1 1 0 8 0 vmmpekpl 168 23040 0 22981 4 0 4 4 0 8 1 vmmpepl 168 205061 0 202554 178 40 138 138 0 357 12 vmsppl 488 3132 0 3102 7 2 5 5 0 8 0 rwobjpl 80 60567 0 53223 169 8 161 161 0 8 5 pdppl 4096 6274 0 6204 114 40 74 84 0 8 4 pvpl 32 30886 0 0 251 3 248 248 0 265 0 pmappl 256 3132 0 3102 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 399 0 76 10 0 10 10 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(ffffffff83373291) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833b19bd,ffffffff833c1477,3b7,ffffffff833eb025) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a3b3520,ffffffff83366975) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80002a3b3518) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,2,2000,ffff80003841c7f0) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80002a3f59e0) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80728c39a8,2,fffffd80097fb750,ffff80003841c7f0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806191fd90,ffff80003841c7f0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806191fd90,ffff80003841c7f0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806191fd90,ffff80003841c7f0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003841c7f0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003841c7f0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003841c7f0,ffff80002a3f5d50,ffff80002a3f5ca0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3f5d50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3f5d50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74a02d8452a0, 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(ffffffff83914398) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83914398) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83914398,1) 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 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff833c11df,ffffffffffffffff) at msleep_nsec+0x132 sys/kern/kern_synch.c:219 taskq_do_barrier(ffff80000002c000) at taskq_do_barrier+0x293 sys/kern/kern_task.c:318 ifiq_destroy(ffff80002a3b39c8) at ifiq_destroy+0xda sys/net/ifq.c:697 if_detach(ffff80002a3b3560) at if_detach+0x836 sys/net/if.c:-1 pppx_if_destroy(ffff800035416000,ffff80002a3b3518) at pppx_if_destroy+0x91 sys/net/if_pppx.c:801 pppxioctl(285b9a,c0307004,ffff800034415d50,1,ffff80002a35e800) at pppxioctl+0x30f sys/net/if_pppx.c:-1 VOP_IOCTL(fffffd8066011eb8,c0307004,ffff800034415d50,1,fffffd80097fb750,ffff80002a35e800) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806191f9d0,c0307004,ffff800034415d50,ffff80002a35e800) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 end trace frame: 0xffff800034415e50, count: 0 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(ffffffff83914398) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83914398) at __mp_lock+0x192 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff83914398,1) 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 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff833c11df,ffffffffffffffff) at msleep_nsec+0x132 sys/kern/kern_synch.c:219 taskq_do_barrier(ffff80000002c000) at taskq_do_barrier+0x293 sys/kern/kern_task.c:318 ifiq_destroy(ffff80002a3b39c8) at ifiq_destroy+0xda sys/net/ifq.c:697 if_detach(ffff80002a3b3560) at if_detach+0x836 sys/net/if.c:-1 pppx_if_destroy(ffff800035416000,ffff80002a3b3518) at pppx_if_destroy+0x91 sys/net/if_pppx.c:801 pppxioctl(285b9a,c0307004,ffff800034415d50,1,ffff80002a35e800) at pppxioctl+0x30f sys/net/if_pppx.c:-1 VOP_IOCTL(fffffd8066011eb8,c0307004,ffff800034415d50,1,fffffd80097fb750,ffff80002a35e800) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806191f9d0,c0307004,ffff800034415d50,ffff80002a35e800) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80002a35e800,ffff800034415f30,ffff800034415e80) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff800034415f30) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800034415f30) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x92eeb7e34c0, count: -17