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 504742 67749 0 0 0x4000000 0 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bfdd0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fac31,ffffffff8350b370,3bf,ffffffff83534065) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c474c58,ffffffff834b1af7) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(0,ffff80003c474c50) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003c3d3a18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800033b97710) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa8061f7a130,1,fffffa80097fd1a0,ffff80003c3d3a18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa8063e48558,ffff80003c3d3a18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa8063e48558,ffff80003c3d3a18) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80003c3d3a18) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80003c3d3a18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c3d3a18,ffff800033b97a80,ffff800033b979d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800033b97a70, 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(ffffffff834bfdd0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fac31,ffffffff8350b370,3bf,ffffffff83534065) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c474c58,ffffffff834b1af7) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(0,ffff80003c474c50) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003c3d3a18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800033b97710) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa8061f7a130,1,fffffa80097fd1a0,ffff80003c3d3a18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa8063e48558,ffff80003c3d3a18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa8063e48558,ffff80003c3d3a18) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80003c3d3a18) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80003c3d3a18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c3d3a18,ffff800033b97a80,ffff800033b979d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033b97a80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800033b97a80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7842f31dbd50, count: -16 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800033b974d0 rbx 0xffff80002999ee07 rdx 0 rcx 0xffff80003c3d3a18 rax 0xffff80002999dff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xedc6a11fee7a5620 r11 0xb61d5cd19be3635e r12 0xffff80002999ec08 r13 0 r14 0 r15 0x1 rip 0xffffffff811e2e55 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff800033b974c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=289965 pid=6959 tcnt=0 stat=onproc flags process=1018 proc=2000 runpri=32, usrpri=79, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003c3d3a18 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff8000fffeefa8,0xffff80003c3d2038 process=0xffff80003c464028 user=0xffff800033b92000, vmspace=0xfffffa800e903208 estcpu=29, cpticks=4, pctcpu=0.3, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50482 481325 112 0 2 0 syz-executor 16679 14312 80497 0 2 0 syz-executor 16679 147443 80497 0 3 0x4000080 fsleep syz-executor 92919 425514 17874 0 2 0 syz-executor 92919 13723 17874 0 3 0x4000080 fsleep syz-executor 67749 160634 62059 0 3 0x80 nanoslp syz-executor 67749 311261 62059 0 3 0x4000080 kqsel syz-executor 67749 504742 62059 0 7 0x4000000 syz-executor 94900 155688 771 0 4 0x48000000 syz-executor 94900 432085 771 0 4 0x4c000000 syz-executor 39385 69617 0 0 3 0x14280 nfsidl nfsio 40905 464894 0 0 3 0x14280 nfsidl nfsio 3071 426415 0 0 3 0x14280 nfsidl nfsio 96400 303384 0 0 3 0x14280 nfsidl nfsio 46503 465785 0 0 3 0x14280 nfsidl nfsio 82311 292373 0 0 3 0x14280 nfsidl nfsio 21371 438206 0 0 3 0x14280 nfsidl nfsio 37154 8474 0 0 3 0x14280 nfsidl nfsio 13829 357432 0 0 3 0x14280 nfsidl nfsio 24062 516614 0 0 3 0x14280 nfsidl nfsio 69862 9431 0 0 3 0x14280 nfsidl nfsio 12904 410573 0 0 3 0x14280 nfsidl nfsio 42266 462501 0 0 3 0x14280 nfsidl nfsio 25156 87156 0 0 3 0x14280 nfsidl nfsio 77474 63115 0 0 3 0x14280 nfsidl nfsio 51418 251310 0 0 3 0x14280 nfsidl nfsio 40152 413934 0 0 3 0x14280 nfsidl nfsio 99515 9396 0 0 3 0x14280 nfsidl nfsio 95088 352703 0 0 3 0x14280 nfsidl nfsio 98654 454359 0 0 3 0x14280 nfsidl nfsio 86807 518203 68472 0 3 0x100082 sbwait ndp 68472 350605 36328 0 3 0x10008a sigsusp sh 50091 153397 11097 0 3 0x82 nanoslp syz-executor 26820 218147 11097 0 3 0x82 wait syz-executor 62059 89425 11097 0 3 0x82 nanoslp syz-executor 80497 351436 11097 0 3 0x82 nanoslp syz-executor 771 27279 11097 0 4 0x58000882 syz-executor 17874 376004 11097 0 3 0x82 nanoslp syz-executor 112 515774 11097 0 3 0x82 nanoslp syz-executor 36328 138142 11097 0 3 0x82 wait syz-executor 11097 125563 57870 0 3 0x10000082 kqread syz-executor 57870 339248 77246 0 3 0x10008a sigsusp ksh 77246 387400 39814 0 3 0x98 kqread sshd-session 39814 463652 90036 0 3 0x92 kqread sshd-session 11499 272952 1 0 3 0x100083 ttyin getty 90036 506145 1 0 3 0x88 kqread sshd 78542 126649 34982 74 3 0x1100092 bpf pflogd 34982 499044 1 0 3 0x80 sbwait pflogd 74780 145571 94347 73 3 0x1100090 kqread syslogd 94347 522625 1 0 3 0x100082 sbwait syslogd 78262 517295 1 0 3 0x100080 kqread resolvd 49353 351810 79409 77 3 0x100092 kqread dhcpleased 91039 233848 79409 77 3 0x100092 kqread dhcpleased 79409 508288 1 0 3 0x80 kqread dhcpleased 71772 268556 0 0 3 0x14200 pause smr 99437 416075 0 0 3 0x14200 pgzero zerothread 93795 201195 0 0 3 0x14200 aiodoned aiodoned 19850 371778 0 0 3 0x14200 syncer update 88955 504705 0 0 3 0x14200 cleaner cleaner 85607 265652 0 0 3 0x14200 reaper reaper 79350 79288 0 0 3 0x14200 pgdaemon pagedaemon 48061 16322 0 0 3 0x14200 bored viomb 24925 466489 0 0 3 0x40014200 acpi0 acpi0 97741 346102 0 0 3 0x40014200 idle1 93262 310178 0 0 3 0x14200 bored softnet1 89551 424189 0 0 2 0x14200 softnet0 97740 22100 0 0 3 0x14200 smrbar systqmp 78007 321525 0 0 3 0x14200 bored systq 47209 248523 0 0 3 0x14200 tmoslp softclockmp 85445 27361 0 0 3 0x40014200 tmoslp softclock 70867 47046 0 0 3 0x40014200 idle0 1 80378 0 0 3 0x20000082 nanoslp init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 89551 (softnet0) thread 0xffff8000ffffe000 (424189) shared rwlock softnet0 r = 0 (0xffff80000002c078) #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 Process 97740 (systqmp) thread 0xffff8000ffffe298 (22100) shared rwlock systqmp r = 0 (0xffffffff8394cc78) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11089 12086K 12414K 166960K 12518 0 pcb 22 12K 12K 166960K 85 0 rtable 230 7K 7K 166960K 430 0 pf 36 18K 81K 166960K 183 0 ifaddr 41 7K 7K 166960K 60 0 ifgroup 56 2K 2K 166960K 87 0 sysctl 4 1K 9K 166960K 12 0 counters 74 37K 38K 166960K 100 0 ioctlops 0 0K 4K 166960K 1561 0 iov 0 0K 16K 166960K 6 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1362 86K 86K 166960K 1667 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 22 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 97K 166960K 370 0 sigio 0 0K 0K 166960K 4 0 proc 73 131K 196K 166960K 575 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 21 0 in_multi 89 6K 7K 166960K 106 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 418 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 235 153K 167K 166960K 5146 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 45 90K 106K 166960K 1566 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 17 0 NDP 12 0K 2K 166960K 38 0 temp 41 9115K 9179K 166960K 20207 0 kqueue 14 22K 28K 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 52 0 48 1 0 1 1 0 8 0 rtentry 176 117 0 15 6 0 6 6 0 8 1 unpcb 144 168 0 151 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 194 0 190 7 0 7 7 0 8 6 arp 136 18 0 2 1 0 1 1 0 8 0 inpcb 328 462 0 449 7 0 7 7 0 8 5 nd6 152 25 0 3 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 11 0 9 1 0 1 1 0 8 0 pppxif 1576 4 0 2 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 3 0 0 1 0 1 1 0 482 0 pffrnode 88 3 0 0 1 0 1 1 0 8 0 pffrent 40 5 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 pfanchor 1288 5 0 0 1 0 1 1 0 8 0 pfstitem 24 33 0 0 1 0 1 1 0 8 0 pfstkey 128 35 0 2 2 0 2 2 0 8 0 pfstate 448 34 0 1 4 0 4 4 0 8 0 pfrule 1360 36 0 29 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 256 505 0 75 29 0 29 29 0 8 2 art_table 40 507 0 75 5 0 5 5 0 8 0 art_node 32 117 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 69 0 67 1 0 1 1 0 8 0 semapl 72 19 0 9 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2059 0 594 93 0 93 93 0 8 0 ffsino 296 2059 0 594 114 0 114 114 0 8 0 nchpl 144 2584 0 879 64 0 64 64 0 8 0 vnodes 216 2326 0 0 130 0 130 130 0 8 0 namei 1024 8440 0 8440 1 0 1 1 0 8 1 percpumem 16 65 0 13 1 0 1 1 0 8 0 kstatmem 264 47 0 19 3 0 3 3 0 8 1 scsiplug 72 3 0 3 1 0 1 1 0 8 1 scxspl 216 8967 0 8967 4 3 1 3 1 8 1 plimitpl 152 154 0 137 1 0 1 1 0 8 0 sigapl 424 719 0 650 8 0 8 8 0 8 0 knotepl 120 500 0 0 16 0 16 16 0 8 0 kqueuepl 224 85 0 73 1 0 1 1 0 8 0 pipepl 344 138 0 111 3 0 3 3 0 8 0 fdescpl 528 683 0 650 3 0 3 3 0 8 0 filepl 160 3544 0 3322 16 0 16 16 0 8 6 lockfpl 104 114 0 112 1 0 1 1 0 8 0 lockfspl 48 54 0 52 1 0 1 1 0 8 0 sessionpl 144 98 0 89 1 0 1 1 0 8 0 pgrppl 48 110 0 93 1 0 1 1 0 8 0 ucredpl 104 621 0 606 1 0 1 1 0 8 0 zombiepl 144 652 0 650 1 0 1 1 0 8 0 processpl 1232 719 0 650 6 0 6 6 0 8 0 procpl 664 1113 0 1039 7 0 7 7 0 8 0 sockpl 752 689 0 655 10 0 10 10 0 8 5 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 128 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 19 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 212 0 0 14 0 14 14 0 8 0 bufpl 272 3034 0 107 196 0 196 196 0 8 0 anonpl 32 7940 0 0 65 1 64 65 0 246 0 amapchunkpl 152 15474 0 15001 27 0 27 27 0 158 8 amappl16 200 1743 0 1717 16 4 12 15 0 8 8 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 445 0 443 1 0 1 1 0 8 0 amappl13 176 124 0 111 1 0 1 1 0 8 0 amappl12 168 937 0 906 2 0 2 2 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 68 0 53 1 0 1 1 0 8 0 amappl9 144 276 0 275 1 0 1 1 0 8 0 amappl8 136 117 0 115 1 0 1 1 0 8 0 amappl7 128 148 0 134 1 0 1 1 0 8 0 amappl6 120 174 0 172 1 0 1 1 0 8 0 amappl5 112 99 0 87 1 0 1 1 0 8 0 amappl4 104 301 0 277 1 0 1 1 0 8 0 amappl3 96 3068 0 2956 4 0 4 4 0 8 0 amappl2 88 573 0 509 2 0 2 2 0 8 0 amappl1 80 11696 0 11063 16 1 15 16 0 8 1 amappl 88 4349 0 4191 5 0 5 5 0 92 0 uvmvnodes 80 114 0 0 3 0 3 3 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 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 8 0 8 2 1 1 1 0 8 1 dma128 128 254 0 254 2 1 1 1 0 8 1 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 683 0 650 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 683 0 650 1 0 1 1 0 8 0 vmmpekpl 168 7524 0 7492 2 0 2 2 0 8 0 vmmpepl 168 52343 0 50348 99 0 99 99 0 357 11 vmsppl 488 682 0 650 5 0 5 5 0 8 0 rwobjpl 80 17156 0 16064 28 0 28 28 0 8 3 pdppl 4096 1373 0 1300 103 30 73 87 0 8 0 pvpl 32 15777 0 0 128 0 128 128 0 265 0 pmappl 256 682 0 650 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 484 0 33 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838f1ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83a2f700) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a2f700) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x4f sys/dev/kcov.c:159 __mp_acquire_count(ffffffff83a2f700,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff835099f9,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 ifq_destroy(ffff80003c474f90) at ifq_destroy+0x106 sys/net/ifq.c:352 end trace frame: 0xffff80003c4110a0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838f1ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83a2f700) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a2f700) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x4f sys/dev/kcov.c:159 __mp_acquire_count(ffffffff83a2f700,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:369 msleep_nsec(ffff80000002c06c,ffff80000002c018,20,ffffffff835099f9,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 ifq_destroy(ffff80003c474f90) at ifq_destroy+0x106 sys/net/ifq.c:352 if_detach(ffff80003c474c98) at if_detach+0x636 sys/net/if.c:-1 pppx_if_destroy(ffff800031b8c000,ffff80003c474c50) at pppx_if_destroy+0x91 sys/net/if_pppx.c:801 pppxioctl(85b9e,c0307004,ffff80003c411320,41,ffff8000fffeefa8) at pppxioctl+0x30f sys/net/if_pppx.c:-1 VOP_IOCTL(fffffa8061f7a208,c0307004,ffff80003c411320,41,fffffa80097fd1a0,ffff8000fffeefa8) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffa8063e484b8,c0307004,ffff80003c411320,ffff8000fffeefa8) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 sys_ioctl(ffff8000fffeefa8,ffff80003c411500,ffff80003c411450) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c411500) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c411500) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x614321cfa0, count: -22 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(ffffffff834bfdd0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fac31,ffffffff8350b370,3bf,ffffffff83534065) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c474c58,ffffffff834b1af7) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(0,ffff80003c474c50) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003c3d3a18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800033b97710) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa8061f7a130,1,fffffa80097fd1a0,ffff80003c3d3a18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa8063e48558,ffff80003c3d3a18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa8063e48558,ffff80003c3d3a18) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80003c3d3a18) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80003c3d3a18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c3d3a18,ffff800033b97a80,ffff800033b979d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff800033b97a70, count: 0 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff834bfdd0) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff834fac31,ffffffff8350b370,3bf,ffffffff83534065) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80003c474c58,ffffffff834b1af7) at refcnt_finalize+0x1e7 sys/kern/kern_synch.c:960 pppx_if_destroy(0,ffff80003c474c50) at pppx_if_destroy+0x3d sys/net/if_pppx.c:794 pppxclose(205b9a,1,2000,ffff80003c3d3a18) at pppxclose+0xa0 sys/net/if_pppx.c:541 spec_close(ffff800033b97710) at spec_close+0x417 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffa8061f7a130,1,fffffa80097fd1a0,ffff80003c3d3a18) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffa8063e48558,ffff80003c3d3a18) at vn_closefile+0x12b sys/kern/vfs_vnops.c:621 fdrop(fffffa8063e48558,ffff80003c3d3a18) at fdrop+0x121 sys/kern/kern_descrip.c:1281 closef(fffffa8063e48558,ffff80003c3d3a18) at closef+0x192 sys/kern/kern_descrip.c:1265 fdfree(ffff80003c3d3a18) at fdfree+0x116 sys/kern/kern_descrip.c:1196 exit1(ffff80003c3d3a18,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c3d3a18,ffff800033b97a80,ffff800033b979d0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff800033b97a80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800033b97a80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7842f31dbd50, count: -16