panic: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 995 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345e9c5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409527,ffffffff8340f89d,3e3,ffffffff8340f8e5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a30a968,ffffffff833521e0) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80002a30a960) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a2a4018) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ebdc6c0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8071a81b58,1,fffffd807f7d3270,ffff80002a2a4018) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8066619788,ffff80002a2a4018) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8066619788,ffff80002a2a4018) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a2a4018) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a2a4018,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a2a4018,ffff80002ebdca30,ffff80002ebdc980) at sys_exit+0x1a sys/kern/kern_exit.c:-1 end trace frame: 0xffff80002ebdca20, 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 995 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8345e9c5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409527,ffffffff8340f89d,3e3,ffffffff8340f8e5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a30a968,ffffffff833521e0) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80002a30a960) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a2a4018) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ebdc6c0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8071a81b58,1,fffffd807f7d3270,ffff80002a2a4018) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8066619788,ffff80002a2a4018) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8066619788,ffff80002a2a4018) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a2a4018) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a2a4018,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a2a4018,ffff80002ebdca30,ffff80002ebdc980) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ebdca30) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebdca30) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x726a526cdfe0, count: -16 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002ebdc490 rbx 0xffffffff83852dd7 cpu_info_full_primary+0x2dd7 rdx 0 rcx 0xffff80002a2a4018 rax 0xffffffff83851ff0 cpu_info_full_primary+0x1ff0 r8 0 r9 0x8080808080808080 r10 0x5951fc6c7b2057e8 r11 0x7225aea01aafef86 r12 0xffffffff83852bd8 cpu_info_full_primary+0x2bd8 r13 0 r14 0 r15 0x1 rip 0xffffffff83296a45 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002ebdc480 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=114985 pid=36842 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a2a4018 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a2a59b8,0xffff80002a2a5c58 process=0xffff8000fffeea90 user=0xffff80002ebd7000, vmspace=0xfffffd8009eded20 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56803 259176 28732 0 2 0 syz-executor 62929 143251 95168 0 2 0 syz-executor 62929 468910 95168 0 2 0x4000000 syz-executor 34880 411110 88887 0 2 0xc80 syz-executor 34880 383462 88887 0 2 0x4000000 syz-executor 71474 79294 49489 60929 2 0xc90 syz-executor 71474 52548 49489 60929 3 0x4000090 kqread syz-executor 71474 503799 49489 60929 3 0x4000090 fsleep syz-executor 68841 326234 34270 0 2 0xc90 syz-executor 68841 51312 34270 0 3 0x4000090 sbwait syz-executor 68841 248285 34270 0 3 0x4000090 sbwait syz-executor 68841 343149 34270 0 3 0x4000090 fsleep syz-executor 9622 273916 47247 0 3 0x80 nanoslp syz-executor 9622 521907 47247 0 3 0x4000080 pipewr syz-executor 9622 147523 47247 0 3 0x4000080 fsleep syz-executor 95168 381511 17239 0 3 0x82 nanoslp syz-executor 22773 383028 0 0 3 0x14200 acct acct 25690 318701 8831 0 3 0x82 sbwait sshd-session 24836 74300 17239 0 2 0xc82 syz-executor 88887 237066 17239 0 2 0xc82 syz-executor 49489 439334 17239 0 3 0x82 nanoslp syz-executor 47247 18618 17239 0 2 0xc82 syz-executor 34270 64311 17239 0 2 0xc82 syz-executor 65944 405715 17239 0 2 0x2 syz-executor 27365 213446 1 0 3 0x100083 ttyin getty 28732 31255 17239 0 3 0x82 nanoslp syz-executor 15730 150946 0 0 3 0x14200 bored sosplice 17239 152225 76655 0 3 0x82 kqread syz-executor 76655 358163 37931 0 3 0x10008a sigsusp ksh 37931 188141 79686 0 3 0x98 kqread sshd-session 79686 62661 8831 0 3 0x92 kqread sshd-session 8831 320777 1 0 3 0x88 kqread sshd 15104 267983 91003 74 3 0x1100092 bpf pflogd 91003 108646 1 0 3 0x80 sbwait pflogd 82853 48590 6706 73 3 0x1100090 kqread syslogd 6706 388476 1 0 3 0x100082 sbwait syslogd 81738 19261 1 0 3 0x100080 kqread resolvd 17703 521425 6876 77 2 0x100012 dhcpleased 91687 105480 6876 77 3 0x100092 kqread dhcpleased 6876 469036 1 0 3 0x80 kqread dhcpleased 34261 468167 0 0 3 0x14200 bored smr 69853 44410 0 0 2 0x14200 zerothread 77515 327529 0 0 3 0x14200 aiodoned aiodoned 28081 99126 0 0 3 0x14200 syncer update 53256 127615 0 0 3 0x14200 cleaner cleaner 11508 348678 0 0 3 0x14200 reaper reaper 43858 179685 0 0 3 0x14200 pgdaemon pagedaemon 93206 484794 0 0 3 0x14200 bored viomb 80168 269944 0 0 3 0x40014200 acpi0 acpi0 96144 377284 0 0 7 0x40014200 idle1 70442 119202 0 0 3 0x14200 bored softnet3 80425 110650 0 0 3 0x14200 bored softnet2 89631 33397 0 0 3 0x14200 bored softnet1 73521 54565 0 0 2 0x14200 softnet0 97287 27971 0 0 3 0x14200 bored systqmp 26111 342101 0 0 3 0x14200 bored systq 77619 281707 0 0 3 0x14200 tmoslp softclockmp 55531 155605 0 0 2 0x40014200 softclock 9216 130842 0 0 3 0x40014200 idle0 1 427640 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 62929 (syz-executor) thread 0xffff80003c4927e0 (468910) Process 73521 (softnet0) thread 0xffff8000ffffea40 (54565) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10251 11138K 12594K 166960K 21704 0 pcb 17 20K 22K 166960K 982 0 rtable 236 15K 15K 166960K 1982 0 pf 36 18K 83K 166960K 434 0 ifaddr 38 8K 9K 166960K 318 0 ifgroup 55 2K 2K 166960K 555 0 sysctl 4 1K 9K 166960K 42 0 counters 70 37K 38K 166960K 826 0 ioctlops 0 0K 4K 166960K 2403 0 iov 0 0K 32K 166960K 355 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1594 100K 101K 166960K 6883 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 13K 166960K 66 0 VM map 2 1K 1K 166960K 2 0 sem 24 29K 29K 166960K 103 0 dirhash 12 2K 3K 166960K 108 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 4885 0 sigio 1 0K 0K 166960K 177 0 proc 73 91K 128K 166960K 1651 0 subproc 72 4K 4K 166960K 287 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 682 0 in_multi 74 5K 7K 166960K 509 0 ether_multi 1 0K 0K 166960K 35 0 mrt 1 0K 0K 166960K 26 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 1341 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 11 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 247 161K 178K 166960K 44253 0 UVM aobj 6 2K 2K 166960K 7 0 pinsyscall 44 88K 102K 166960K 6688 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 205 0 NDP 14 0K 2K 166960K 234 0 temp 81 8688K 8816K 166960K 194075 0 kqueue 16 24K 33K 166960K 889 0 SYN cache 2 4K 18K 166960K 4 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 120 631 0 628 7 5 2 3 0 8 1 rtentry 176 636 0 546 6 0 6 6 0 8 0 unpcb 144 3357 0 3333 28 24 4 6 0 8 1 syncache 336 32 0 32 7 7 0 1 0 8 0 tcpqe 32 6 0 6 5 5 0 1 0 8 0 tcpcb 808 1532 0 1521 29 21 8 8 0 8 6 arp 128 86 0 68 1 0 1 1 0 8 0 inpcb 384 5320 0 5305 61 52 9 15 0 8 6 nd6 144 115 0 95 2 1 1 2 0 8 0 pkpcb 40 50 0 50 6 5 1 1 0 8 1 kcovpl 48 31 0 23 1 0 1 1 0 8 0 mppekey 1024 4 0 4 3 3 0 1 0 8 0 ppxss 1192 308 0 307 7 6 1 1 0 8 0 pppxif 1504 92 0 91 9 8 1 1 0 8 0 pffrag 232 29 0 21 1 0 1 1 0 482 0 pffrnode 88 23 0 16 1 0 1 1 0 8 0 pffrent 40 51 0 42 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 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 1 0 1 1 1 0 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 243 0 122 1 0 1 1 0 8 0 pfstkey 128 243 0 122 4 0 4 4 0 8 0 pfstate 384 243 0 122 13 0 13 13 0 8 0 pfrule 1344 29 0 21 2 1 1 2 0 8 0 rttmr 136 8 0 8 6 6 0 1 0 8 0 art_heap8 4096 71 0 66 39 34 5 38 0 8 0 art_heap4 256 2449 0 2087 46 20 26 34 0 8 0 art_table 32 2520 0 2153 5 1 4 5 0 8 0 art_node 16 617 0 543 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 17 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 92 0 70 1 0 1 1 0 8 0 shmpl 112 4 0 1 1 0 1 1 0 8 0 dirhash 1024 81 0 64 3 0 3 3 0 8 0 dino2pl 256 9944 0 8391 98 0 98 98 0 8 0 ffsino 288 9944 0 8391 112 0 112 112 0 8 0 nchpl 144 16348 0 15751 64 39 25 64 0 8 0 rtmask 32 38 0 38 8 7 1 1 0 8 1 uvmvnodes 80 4543 0 0 93 0 93 93 0 8 0 vnodes 216 4543 0 0 253 0 253 253 0 8 0 namei 1024 63601 0 63600 7 6 1 2 0 8 0 percpumem 16 428 0 378 1 0 1 1 0 8 0 kstatmem 264 348 0 320 4 1 3 3 0 8 0 acpiwqpl 32 3 0 3 1 0 1 1 1 8 1 scsiplug 72 14 0 14 6 6 0 1 0 8 0 scxspl 216 47874 0 47874 15 14 1 8 1 8 1 plimitpl 152 1139 0 1121 1 0 1 1 0 8 0 sigapl 424 5149 0 5097 9 2 7 9 0 8 0 knotepl 120 808 0 0 24 0 24 24 0 8 0 kqueuepl 224 2066 0 2052 30 28 2 9 0 8 0 pipepl 336 812 0 784 18 12 6 8 0 8 3 fdescpl 520 5099 0 5067 3 0 3 3 0 8 0 filepl 160 37875 0 37645 47 32 15 20 0 8 1 lockfpl 104 2102 0 2100 5 4 1 2 0 8 0 lockfspl 48 599 0 597 1 0 1 1 0 8 0 sessionpl 144 74 0 64 1 0 1 1 0 8 0 pgrppl 48 366 0 348 1 0 1 1 0 8 0 ucredpl 104 6231 0 6215 1 0 1 1 0 8 0 zombiepl 144 5602 0 5601 3 2 1 1 0 8 0 processpl 1208 5149 0 5097 6 0 6 6 0 8 0 procpl 656 12537 0 12476 8 1 7 8 0 8 0 srpgc 96 47 0 47 8 7 1 1 0 8 1 sosppl 168 25 0 25 9 8 1 1 0 8 1 sockpl 728 9457 0 9416 91 80 11 22 0 8 5 mcl64k 65536 8 0 0 1 0 1 1 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 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 15 0 15 15 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 58 0 0 6 1 5 6 0 8 0 mtagpl 96 280 0 0 7 0 7 7 0 8 0 mbufpl 256 1419 0 0 86 0 86 86 0 8 0 bufpl 280 15438 0 9296 440 1 439 440 0 8 0 anonpl 32 11323 0 0 92 1 91 92 0 246 0 amapchunkpl 152 148837 0 148290 68 41 27 37 0 158 1 amappl16 200 10366 0 10305 85 68 17 18 0 8 10 amappl15 192 8 0 8 3 3 0 1 0 8 0 amappl14 184 224 0 210 1 0 1 1 0 8 0 amappl13 176 27 0 26 4 3 1 1 0 8 0 amappl12 168 6147 0 6116 3 1 2 2 0 8 0 amappl11 160 50 0 35 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 249 0 249 2 2 0 1 0 8 0 amappl8 136 30 0 27 1 0 1 1 0 8 0 amappl7 128 187 0 173 1 0 1 1 0 8 0 amappl6 120 460 0 455 1 0 1 1 0 8 0 amappl5 112 215 0 205 1 0 1 1 0 8 0 amappl4 104 516 0 494 1 0 1 1 0 8 0 amappl3 96 31710 0 31601 4 0 4 4 0 8 0 amappl2 88 1221 0 1150 2 0 2 2 0 8 0 amappl1 80 36247 0 35561 18 2 16 16 0 8 0 amappl 88 42123 0 41954 5 0 5 5 0 92 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 3 0 3 3 3 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 255 0 255 3 3 0 1 0 8 0 dma64 64 11 0 11 5 5 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 37 0 36 1 0 1 1 0 8 0 aobjpl 72 6 0 1 1 0 1 1 0 8 0 uaddrrnd 24 5099 0 5067 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5099 0 5067 1 0 1 1 0 8 0 vmmpekpl 168 35747 0 35678 4 0 4 4 0 8 0 vmmpepl 168 322288 0 320103 139 28 111 111 0 357 6 vmsppl 480 5098 0 5067 5 0 5 5 0 8 0 rwobjpl 72 81390 0 75767 116 7 109 109 0 8 3 pdppl 4096 10205 0 10134 159 84 75 83 0 8 4 pvpl 32 18879 0 0 153 1 152 153 0 265 0 pmappl 256 5098 0 5067 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 643 0 196 13 0 13 13 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(ffffffff8345e9c5) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff83409527,ffffffff8340f89d,3e3,ffffffff8340f8e5) at __assert+0x29 sys/kern/subr_prf.c:-1 refcnt_finalize(ffff80002a30a968,ffffffff833521e0) at refcnt_finalize+0x1c8 sys/kern/kern_synch.c:996 pppx_if_destroy(0,ffff80002a30a960) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806 pppxclose(205b9a,1,2000,ffff80002a2a4018) at pppxclose+0xa0 sys/net/if_pppx.c:553 spec_close(ffff80002ebdc6c0) at spec_close+0x412 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8071a81b58,1,fffffd807f7d3270,ffff80002a2a4018) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8066619788,ffff80002a2a4018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8066619788,ffff80002a2a4018) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd8066619788,ffff80002a2a4018) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff80002a2a4018) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff80002a2a4018,0,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a2a4018,ffff80002ebdca30,ffff80002ebdc980) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ebdca30) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebdca30) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x726a526cdfe0, 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff8000299ddff0) at sched_idle+0x4f8 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: 10 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 acpicpu_idle() at acpicpu_idle+0x41e sys/dev/acpi/acpicpu.c:1218 sched_idle(ffff8000299ddff0) at sched_idle+0x4f8 sys/kern/kern_sched.c:182 end trace frame: 0x0, count: -5