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 376681 59952 0 0 0x4000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83468e33) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417dfe,ffffffff8341f6d5,3b7,ffffffff8341f758) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4474e8,ffffffff8335e338) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003c4474e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a40d218) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459080) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80671a1cb8,1,fffffd80097fb478,ffff80003a40d218) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b823c20,ffff80003a40d218) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806b823c20,ffff80003a40d218) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a40d218) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003a40d218,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a40d218,ffff80003c4593f0,ffff80003c459340) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80003c4593e0, 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(ffffffff83468e33) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417dfe,ffffffff8341f6d5,3b7,ffffffff8341f758) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4474e8,ffffffff8335e338) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003c4474e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a40d218) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459080) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80671a1cb8,1,fffffd80097fb478,ffff80003a40d218) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b823c20,ffff80003a40d218) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806b823c20,ffff80003a40d218) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a40d218) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003a40d218,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a40d218,ffff80003c4593f0,ffff80003c459340) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4593f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4593f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721ae9ff6040, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c458e50 rbx 0xffffffff83848dd7 cpu_info_full_primary+0x2dd7 rdx 0 rcx 0xffff80003a40d218 rax 0xffffffff83847ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x2c8ab2d76fb0b981 r11 0x2401b86fa1088698 r12 0xffffffff83848bd8 cpu_info_full_primary+0x2bd8 r13 0 r14 0 r15 0x1 rip 0xffffffff8195a8a5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c458e40 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=435253 pid=37454 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=51, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003a40d218 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003a40d738,0xffff80003a40d9d8 process=0xffff80003a416208 user=0xffff80003c454000, vmspace=0xfffffd806b7ee3e0 estcpu=1, cpticks=5, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 31444 421600 35624 0 2 0 syz-executor 31444 448513 35624 0 3 0x4000080 ttyout syz-executor 37521 156666 83115 0 2 0 syz-executor 14370 292888 49243 0 2 0 syz-executor 14370 372654 49243 0 3 0x4000080 rest syz-executor 14370 404743 49243 0 3 0x4000080 bell syz-executor 59952 79315 29081 0 2 0 syz-executor 59952 376681 29081 0 7 0x4000000 syz-executor 33206 119212 95100 0 3 0x80 nanoslp syz-executor 33206 384434 95100 0 2 0x4000000 syz-executor 33206 462384 95100 0 3 0x4000080 fsleep syz-executor 33206 15705 95100 0 3 0x4000080 fsleep syz-executor 46326 329193 97113 0 2 0 syz-executor 46326 133850 97113 0 3 0x4000080 fsleep syz-executor 46326 427441 97113 0 3 0x4000080 fsleep syz-executor 34162 398609 60227 0 2 0 syz-executor 34162 472140 60227 0 3 0x4000080 fsleep syz-executor 34162 138526 60227 0 3 0x4000080 fsleep syz-executor 97113 203634 55039 0 3 0x82 nanoslp syz-executor 49243 275336 55039 0 3 0x82 nanoslp syz-executor 29081 211128 55039 0 3 0x82 nanoslp syz-executor 60227 452234 55039 0 3 0x82 nanoslp syz-executor 35624 446427 55039 0 2 0xc82 syz-executor 95100 145313 55039 0 3 0x82 nanoslp syz-executor 52711 63349 55039 0 3 0x82 nanoslp syz-executor 83115 408364 55039 0 2 0x2 syz-executor 55039 171938 48595 0 3 0x82 kqread syz-executor 48595 391186 19537 0 3 0x10008a sigsusp ksh 19537 295561 26373 0 3 0x98 kqread sshd-session 26373 119322 16274 0 3 0x92 kqread sshd-session 79982 235083 1 0 3 0x100083 ttyin getty 16274 90207 1 0 3 0x88 kqread sshd 99672 286672 9266 74 3 0x1100092 bpf pflogd 9266 48246 1 0 3 0x80 sbwait pflogd 52050 388863 90121 73 3 0x1100090 kqread syslogd 90121 401770 1 0 3 0x100082 sbwait syslogd 50300 192030 1 0 3 0x100080 kqread resolvd 3670 313011 59887 77 3 0x100092 kqread dhcpleased 28352 190987 59887 77 3 0x100092 kqread dhcpleased 59887 364555 1 0 3 0x80 kqread dhcpleased 17331 307869 0 0 3 0x14200 bored smr 93743 119506 0 0 2 0x14200 zerothread 80760 500715 0 0 3 0x14200 aiodoned aiodoned 95206 467120 0 0 3 0x14200 syncer update 2950 131248 0 0 3 0x14200 cleaner cleaner 49746 384641 0 0 3 0x14200 reaper reaper 32717 113730 0 0 3 0x14200 pgdaemon pagedaemon 55912 52738 0 0 3 0x14200 bored viomb 63275 299495 0 0 3 0x40014200 acpi0 acpi0 7835 224371 0 0 3 0x40014200 idle1 45164 415324 0 0 3 0x14200 bored softnet7 41584 147698 0 0 3 0x14200 bored softnet6 25067 357563 0 0 3 0x14200 bored softnet5 79867 488266 0 0 3 0x14200 bored softnet4 39103 263887 0 0 3 0x14200 bored softnet3 54461 296912 0 0 3 0x14200 bored softnet2 61474 349380 0 0 3 0x14200 bored softnet1 54379 374406 0 0 2 0x14200 softnet0 59318 174498 0 0 3 0x14200 smrbar systqmp 67806 127689 0 0 3 0x14200 bored systq 30758 478225 0 0 3 0x14200 tmoslp softclockmp 71240 41922 0 0 3 0x40014200 tmoslp softclock 64246 457412 0 0 3 0x40014200 idle0 1 439553 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 54379 (softnet0) thread 0xffff8000ffffecd0 (374406) shared rwlock softnet0 r = 0 (0xffff80000002c078) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 Process 59318 (systqmp) thread 0xffff8000ffffe520 (174498) shared rwlock systqmp r = 0 (0xffffffff83843b88) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb 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 10208 11062K 11063K 166960K 11292 0 pcb 19 12K 12K 166960K 27 0 rtable 207 6K 6K 166960K 267 0 pf 36 17K 18K 166960K 52 0 ifaddr 44 7K 8K 166960K 50 0 ifgroup 57 2K 2K 166960K 66 0 sysctl 1 1K 9K 166960K 5 0 counters 72 37K 38K 166960K 80 0 ioctlops 0 0K 4K 166960K 1529 0 iov 0 0K 2K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1359 86K 86K 166960K 1385 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 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 148 0 proc 69 91K 128K 166960K 528 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 1 0 in_multi 99 7K 7K 166960K 101 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 37 175K 175K 166960K 37 0 exec 0 0K 1K 166960K 371 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 242 167K 176K 166960K 3003 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 43 86K 104K 166960K 1256 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 4 0 NDP 13 0K 2K 166960K 31 0 temp 37 8674K 8738K 166960K 4077 0 kqueue 15 24K 24K 166960K 25 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 36 0 33 1 0 1 1 0 8 0 rtentry 176 97 0 3 5 0 5 5 0 8 0 unpcb 144 39 0 19 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 11 0 6 1 0 1 1 0 8 0 arp 128 10 0 0 1 0 1 1 0 8 0 inpcb 328 76 0 64 1 0 1 1 0 8 0 nd6 144 16 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 4 0 2 1 0 1 1 0 8 0 pppxif 1504 3 0 2 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 14 0 0 1 0 1 1 0 8 0 pfstkey 128 14 0 0 1 0 1 1 0 8 0 pfstate 384 14 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 256 442 0 0 28 0 28 28 0 8 0 art_table 40 443 0 0 5 0 5 5 0 8 0 art_node 32 97 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1582 0 67 95 0 95 95 0 8 0 ffsino 288 1582 0 67 109 0 109 109 0 8 0 nchpl 144 1782 0 87 63 0 63 63 0 8 0 uvmvnodes 80 1689 0 0 35 0 35 35 0 8 0 vnodes 216 1689 0 0 94 0 94 94 0 8 0 namei 1024 5529 0 5529 2 0 2 2 0 8 2 percpumem 16 55 0 4 1 0 1 1 0 8 0 kstatmem 264 32 0 3 3 0 3 3 0 8 0 scxspl 216 6677 0 6677 9 1 8 8 1 8 8 plimitpl 152 30 0 12 1 0 1 1 0 8 0 sigapl 424 459 0 405 7 0 7 7 0 8 0 knotepl 120 59 0 0 2 0 2 2 0 8 0 kqueuepl 224 24 0 12 1 0 1 1 0 8 0 pipepl 336 105 0 78 3 0 3 3 0 8 0 fdescpl 520 437 0 405 3 0 3 3 0 8 0 filepl 160 1538 0 1310 11 0 11 11 0 8 1 lockfpl 104 10 0 6 1 0 1 1 0 8 0 lockfspl 48 7 0 3 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 13 1 0 1 1 0 8 0 ucredpl 104 81 0 68 1 0 1 1 0 8 0 zombiepl 144 406 0 405 1 0 1 1 0 8 0 processpl 1240 459 0 405 5 0 5 5 0 8 0 procpl 656 494 0 429 6 0 6 6 0 8 0 sockpl 728 151 0 116 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 17 0 0 3 0 3 3 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 123 0 0 8 0 8 8 0 8 0 bufpl 280 2882 0 122 198 0 198 198 0 8 0 anonpl 32 7475 0 0 61 0 61 61 0 246 0 amapchunkpl 152 8662 0 8145 24 3 21 21 0 158 0 amappl16 200 2180 0 1922 15 1 14 14 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 112 0 99 1 0 1 1 0 8 0 amappl13 176 31 0 31 1 1 0 1 0 8 0 amappl12 168 1100 0 1069 3 1 2 2 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 5 0 4 1 0 1 1 0 8 0 amappl9 144 251 0 251 1 1 0 1 0 8 0 amappl8 136 35 0 33 1 0 1 1 0 8 0 amappl7 128 123 0 110 1 0 1 1 0 8 0 amappl6 120 185 0 181 1 0 1 1 0 8 0 amappl5 112 122 0 113 1 0 1 1 0 8 0 amappl4 104 302 0 284 1 0 1 1 0 8 0 amappl3 96 1342 0 1225 4 1 3 3 0 8 0 amappl2 88 640 0 579 2 0 2 2 0 8 0 amappl1 80 8476 0 7875 15 0 15 15 0 8 1 amappl 88 2311 0 2143 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 437 0 405 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 437 0 405 1 0 1 1 0 8 0 vmmpekpl 168 5226 0 5192 2 0 2 2 0 8 0 vmmpepl 168 35137 0 32899 98 0 98 98 0 357 0 vmsppl 480 436 0 405 5 0 5 5 0 8 0 rwobjpl 72 14607 0 11755 52 0 52 52 0 8 0 pdppl 4096 881 0 810 103 24 79 87 0 8 8 pvpl 32 14626 0 0 118 0 118 118 0 265 0 pmappl 256 436 0 405 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 380 0 26 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(ffffffff83468e33) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83417dfe,ffffffff8341f6d5,3b7,ffffffff8341f758) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c4474e8,ffffffff8335e338) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952 pppx_if_destroy(0,ffff80003c4474e0) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003a40d218) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff80003c459080) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80671a1cb8,1,fffffd80097fb478,ffff80003a40d218) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b823c20,ffff80003a40d218) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b823c20,ffff80003a40d218) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd806b823c20,ffff80003a40d218) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80003a40d218) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80003a40d218,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff80003a40d218,ffff80003c4593f0,ffff80003c459340) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4593f0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4593f0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x721ae9ff6040, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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(ffffffff839069e0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839069e0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff839069e0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff833a6c0b,ffffffffffffffff) at msleep_nsec+0x141 sys/kern/kern_synch.c:219 taskq_do_barrier(ffff80000002c000) at taskq_do_barrier+0x26e sys/kern/kern_task.c:318 ifq_destroy(ffff80003c4477d8) at ifq_destroy+0xf9 sys/net/ifq.c:361 if_detach(ffff80003c447528) at if_detach+0x6c6 sys/net/if.c:-1 pppx_if_destroy(ffff8000353fa000,ffff80003c4474e0) at pppx_if_destroy+0x91 sys/net/if_pppx.c:801 pppxioctl(285b9a,c0307004,ffff80003c45f170,1,ffff80003a40cf88) at pppxioctl+0x2f8 pppx_del_session sys/net/if_pppx.c:761 [inline] pppxioctl(285b9a,c0307004,ffff80003c45f170,1,ffff80003a40cf88) at pppxioctl+0x2f8 sys/net/if_pppx.c:425 VOP_IOCTL(fffffd80671a1a30,c0307004,ffff80003c45f170,1,fffffd80097fb478,ffff80003a40cf88) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806b7bb190,c0307004,ffff80003c45f170,ffff80003a40cf88) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 end trace frame: 0xffff80003c45f270, count: 0 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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(ffffffff839069e0) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839069e0) at __mp_lock+0x199 sys/kern/kern_lock.c:165 __mp_acquire_count(ffffffff839069e0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff833a6c0b,ffffffffffffffff) at msleep_nsec+0x141 sys/kern/kern_synch.c:219 taskq_do_barrier(ffff80000002c000) at taskq_do_barrier+0x26e sys/kern/kern_task.c:318 ifq_destroy(ffff80003c4477d8) at ifq_destroy+0xf9 sys/net/ifq.c:361 if_detach(ffff80003c447528) at if_detach+0x6c6 sys/net/if.c:-1 pppx_if_destroy(ffff8000353fa000,ffff80003c4474e0) at pppx_if_destroy+0x91 sys/net/if_pppx.c:801 pppxioctl(285b9a,c0307004,ffff80003c45f170,1,ffff80003a40cf88) at pppxioctl+0x2f8 pppx_del_session sys/net/if_pppx.c:761 [inline] pppxioctl(285b9a,c0307004,ffff80003c45f170,1,ffff80003a40cf88) at pppxioctl+0x2f8 sys/net/if_pppx.c:425 VOP_IOCTL(fffffd80671a1a30,c0307004,ffff80003c45f170,1,fffffd80097fb478,ffff80003a40cf88) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806b7bb190,c0307004,ffff80003c45f170,ffff80003a40cf88) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff80003a40cf88,ffff80003c45f350,ffff80003c45f2a0) at sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 syscall(ffff80003c45f350) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c45f350) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1ff19a2b070, count: -17