panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 316 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *357295 99277 0 0x2 0 0K ifconfig db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a3608) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833de253,ffffffff8342901c,13c,ffffffff8331ca90) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff80000161d000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80003c472ef0) at if_clone_destroy+0x205 sys/net/if.c:1412 ifioctl(ffff8000014ab518,80206979,ffff80003c472ef0,ffff8000fffeefa8) at ifioctl+0x59d sys/net/if.c:2089 sys_ioctl(ffff8000fffeefa8,ffff80003c4730d0,ffff80003c473020) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c4730d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4730d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x730de1399840, count: 6 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 "sc->sc_dev == 0" failed: file "/syzkaller/managers/multicore/kernel/sys/net/if_tun.c", line 316 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833a3608) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833de253,ffffffff8342901c,13c,ffffffff8331ca90) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff80000161d000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80003c472ef0) at if_clone_destroy+0x205 sys/net/if.c:1412 ifioctl(ffff8000014ab518,80206979,ffff80003c472ef0,ffff8000fffeefa8) at ifioctl+0x59d sys/net/if.c:2089 sys_ioctl(ffff8000fffeefa8,ffff80003c4730d0,ffff80003c473020) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c4730d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4730d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x730de1399840, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c472ca0 rbx 0xffffffff83870e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000fffeefa8 rax 0xffffffff8386fff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x703630dd2f5dce3 r11 0xb4aae056bf0aef65 r12 0xffffffff83870c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff81f52ef5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c472c90 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (ifconfig) tid=357295 pid=99277 tcnt=1 stat=onproc flags process=2 proc=0 runpri=78, usrpri=79, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800038bf62c0,0xffff8000fffeea88 process=0xffff80002e4444f8 user=0xffff80003c46e000, vmspace=0xfffffd800b0633d0 estcpu=29, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74632 270897 89791 0 2 0 syz-executor *99277 357295 26812 0 7 0x2 ifconfig 33258 334653 87852 0 2 0 syz-executor 33258 137392 87852 0 2 0x4000000 syz-executor 26812 344089 349 0 3 0x10008a sigsusp sh 52358 412764 71951 0 2 0 syz-executor 52358 395742 71951 0 2 0x4000c80 syz-executor 52358 461308 71951 0 3 0x4000080 ttyretype syz-executor 349 95426 95713 0 3 0x82 wait syz-executor 19676 246445 84123 0 2 0 syz-executor 19676 19751 84123 0 3 0x4000080 fsleep syz-executor 34367 520484 54745 -1 2 0x10 syz-executor 34367 122859 54745 -1 3 0x4000090 fsleep syz-executor 10035 411103 74851 0 2 0 syz-executor 10035 494053 74851 0 3 0x4000080 fsleep syz-executor 83186 197402 9018 0 2 0xc80 syz-executor 83186 233902 9018 0 3 0x4000080 msgwait syz-executor 83186 502851 9018 0 3 0x4000080 fsleep syz-executor 83186 58396 9018 0 3 0x4000080 fsleep syz-executor 56288 231210 0 0 3 0x14280 nfsidl nfsio 66755 436151 0 0 3 0x14280 nfsidl nfsio 65001 497785 0 0 3 0x14280 nfsidl nfsio 53250 2505 0 0 3 0x14280 nfsidl nfsio 19001 489591 0 0 3 0x14280 nfsidl nfsio 97027 239409 0 0 3 0x14280 nfsidl nfsio 89425 21911 0 0 3 0x14280 nfsidl nfsio 54501 239542 0 0 3 0x14280 nfsidl nfsio 15557 516191 0 0 3 0x14280 nfsidl nfsio 41937 159211 0 0 3 0x14280 nfsidl nfsio 48824 480745 0 0 3 0x14280 nfsidl nfsio 38467 317797 0 0 3 0x14280 nfsidl nfsio 3214 424552 0 0 3 0x14280 nfsidl nfsio 64782 491254 0 0 3 0x14280 nfsidl nfsio 16802 479616 0 0 3 0x14280 nfsidl nfsio 15979 171386 0 0 3 0x14280 nfsidl nfsio 98552 91575 0 0 3 0x14280 nfsidl nfsio 27055 222540 0 0 3 0x14280 nfsidl nfsio 97766 86616 0 0 3 0x14280 nfsidl nfsio 74957 450883 0 0 3 0x14280 nfsidl nfsio 84123 230743 95713 0 2 0xc82 syz-executor 9018 466194 95713 0 2 0xc82 syz-executor 74851 144105 95713 0 2 0xc82 syz-executor 87852 422388 95713 0 2 0xc82 syz-executor 71951 482332 95713 0 2 0xc82 syz-executor 89791 251577 95713 0 2 0xc82 syz-executor 54745 346838 95713 0 2 0xc82 syz-executor 95713 352110 70921 0 3 0x82 kqread syz-executor 70921 78628 20403 0 3 0x10008a sigsusp ksh 20403 39710 74053 0 3 0x98 kqread sshd-session 74053 9043 67492 0 3 0x92 kqread sshd-session 49168 111026 1 0 3 0x100083 ttyopn getty 67492 118772 1 0 3 0x88 kqread sshd 97 299383 49524 74 3 0x1100092 bpf pflogd 49524 294457 1 0 3 0x80 sbwait pflogd 56327 122951 37530 73 3 0x1100090 kqread syslogd 37530 228599 1 0 3 0x100082 sbwait syslogd 81741 473925 1 0 3 0x100080 kqread resolvd 29229 503754 27967 77 2 0x100092 dhcpleased 45599 389678 27967 77 3 0x100092 kqread dhcpleased 27967 252033 1 0 3 0x80 kqread dhcpleased 19021 123408 0 0 3 0x14200 bored smr 52710 419815 0 0 2 0x14200 zerothread 83346 73552 0 0 3 0x14200 aiodoned aiodoned 73528 112347 0 0 3 0x14200 syncer update 43236 390940 0 0 3 0x14200 cleaner cleaner 74578 213501 0 0 3 0x14200 reaper reaper 82935 112061 0 0 3 0x14200 pgdaemon pagedaemon 91856 483675 0 0 3 0x14200 bored viomb 29024 89710 0 0 3 0x40014200 acpi0 acpi0 61843 191666 0 0 7 0x40014200 idle1 87624 314184 0 0 3 0x14200 bored softnet1 748 515463 0 0 3 0x14200 bored softnet0 8720 186624 0 0 3 0x14200 bored systqmp 97517 199741 0 0 3 0x14200 bored systq 24600 145990 0 0 3 0x14200 tmoslp softclockmp 80393 443123 0 0 3 0x40014200 tmoslp softclock 90223 455578 0 0 3 0x40014200 idle0 1 484367 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 99277 (ifconfig) thread 0xffff8000fffeefa8 (357295) exclusive rwlock clonelk r = 0 (0xffffffff8389d7e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2089 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839643c8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 ifioctl+0x58c sys/net/if.c:2089 #2 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #3 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #3 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #4 Xsyscall+0x128 Process 33258 (syz-executor) thread 0xffff800038bf62c0 (137392) exclusive rrwlock inode r = 0 (0xfffffd806c85db48) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10246 11112K 12339K 166960K 12602 0 pcb 17 16K 20K 166960K 244 0 rtable 212 10K 11K 166960K 612 0 pf 41 19K 83K 166960K 127 0 ifaddr 40 7K 8K 166960K 97 0 ifgroup 59 2K 3K 166960K 141 0 sysctl 1 1K 9K 166960K 9 0 counters 70 37K 38K 166960K 140 0 ioctlops 0 0K 4K 166960K 1662 0 iov 0 0K 14K 166960K 29 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1430 90K 91K 166960K 2051 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 28 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 240K 166960K 877 0 sigio 0 0K 0K 166960K 6 0 proc 79 131K 180K 166960K 658 0 subproc 72 4K 4K 166960K 100 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 122 0 in_multi 81 5K 7K 166960K 169 0 ether_multi 1 0K 0K 166960K 6 0 mrt 1 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 489 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 247 162K 179K 166960K 9687 0 UVM aobj 89 7K 9K 166960K 90 0 pinsyscall 44 88K 103K 166960K 2047 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 36 0 NDP 13 0K 2K 166960K 58 0 temp 65 8668K 8737K 166960K 44105 0 kqueue 13 20K 30K 166960K 171 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 120 133 0 130 2 0 2 2 0 8 1 rtentry 176 168 0 87 6 0 6 6 0 8 0 unpcb 144 533 0 514 7 3 4 4 0 8 3 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpcb 736 206 0 202 7 3 4 4 0 8 3 arp 136 27 0 11 1 0 1 1 0 8 0 inpcb 328 1058 0 1049 20 11 9 12 0 8 8 nd6 152 34 0 14 1 0 1 1 0 8 0 pkpcb 40 39 0 39 2 1 1 1 0 8 1 kcovpl 48 11 0 3 1 0 1 1 0 8 0 ppxss 1192 23 0 23 1 0 1 1 0 8 1 pppxif 1504 7 0 7 1 0 1 1 0 8 1 pffrag 232 11 0 0 1 0 1 1 0 482 0 pffrnode 88 11 0 0 1 0 1 1 0 8 0 pffrent 40 14 0 3 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 5 0 3 1 0 1 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 53 0 3 1 0 1 1 0 8 0 pfstkey 128 181 0 131 2 0 2 2 0 8 0 pfstate 448 116 0 67 6 0 6 6 0 8 0 pfrule 1344 28 0 21 2 1 1 2 0 8 0 art_heap8 4096 4 0 1 4 0 4 4 0 8 1 art_heap4 256 767 0 371 31 0 31 31 0 8 2 art_table 40 771 0 372 5 0 5 5 0 8 0 art_node 32 167 0 98 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 6 2 1 1 1 0 8 1 semapl 112 23 0 13 1 0 1 1 0 8 0 shmpl 112 84 0 0 3 0 3 3 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2862 0 1355 95 0 95 95 0 8 0 ffsino 296 2862 0 1355 117 0 117 117 0 8 0 nchpl 144 4051 0 2343 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 3379 0 0 188 0 188 188 0 8 0 namei 1024 13849 0 13849 1 0 1 1 0 8 1 percpumem 16 85 0 35 1 0 1 1 0 8 0 vcpupl 3968 3 0 1 1 0 1 1 0 8 0 vmpool 840 3 0 1 1 0 1 1 0 8 0 pfiaddrpl 120 1 0 0 1 0 1 1 0 8 0 kstatmem 264 80 0 50 3 0 3 3 0 8 0 scsiplug 72 3 0 3 2 1 1 1 0 8 1 scxspl 216 21371 0 21371 9 8 1 8 1 8 1 plimitpl 152 190 0 172 1 0 1 1 0 8 0 sigapl 424 1185 0 1116 9 1 8 8 0 8 0 knotepl 120 549 0 0 17 0 17 17 0 8 0 kqueuepl 224 426 0 415 5 0 5 5 0 8 4 pipepl 344 196 0 169 4 0 4 4 0 8 1 fdescpl 528 1145 0 1112 3 0 3 3 0 8 0 filepl 160 6827 0 6605 21 4 17 18 0 8 6 lockfpl 104 301 0 298 1 0 1 1 0 8 0 lockfspl 48 113 0 110 1 0 1 1 0 8 0 sessionpl 144 27 0 18 1 0 1 1 0 8 0 pgrppl 48 47 0 30 1 0 1 1 0 8 0 ucredpl 104 918 0 904 1 0 1 1 0 8 0 zombiepl 144 1116 0 1116 1 0 1 1 0 8 1 processpl 1232 1185 0 1116 6 0 6 6 0 8 0 procpl 664 2348 0 2270 7 0 7 7 0 8 0 sosppl 176 3 0 3 2 1 1 1 0 8 1 sockpl 752 1822 0 1791 30 17 13 17 0 8 9 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mtagpl 96 18 0 0 1 0 1 1 0 8 0 mbufpl 256 240 0 0 15 0 15 15 0 8 0 bufpl 280 8274 0 2137 439 0 439 439 0 8 0 anonpl 32 10789 0 0 88 1 87 87 0 246 0 amapchunkpl 152 44715 0 44183 46 7 39 39 0 158 14 amappl16 200 3781 0 3743 24 9 15 20 0 8 8 amappl15 192 40 0 40 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 454 0 452 1 0 1 1 0 8 0 amappl12 168 1572 0 1528 3 0 3 3 0 8 0 amappl11 160 73 0 73 2 2 0 1 0 8 0 amappl10 152 53 0 39 1 0 1 1 0 8 0 amappl9 144 264 0 264 1 1 0 1 0 8 0 amappl8 136 29 0 26 1 0 1 1 0 8 0 amappl7 128 123 0 121 1 0 1 1 0 8 0 amappl6 120 309 0 294 1 0 1 1 0 8 0 amappl5 112 85 0 74 1 0 1 1 0 8 0 amappl4 104 435 0 404 1 0 1 1 0 8 0 amappl3 96 5456 0 5367 3 0 3 3 0 8 0 amappl2 88 1263 0 1186 2 0 2 2 0 8 0 amappl1 80 12672 0 12076 15 1 14 14 0 8 0 amappl 88 8790 0 8623 5 0 5 5 0 92 0 uvmvnodes 80 129 0 0 3 0 3 3 0 8 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 128 254 0 254 2 1 1 1 0 8 1 dma64 64 9 0 9 2 2 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 89 0 1 2 0 2 2 0 8 0 uaddrrnd 24 1146 0 1113 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1146 0 1113 1 0 1 1 0 8 0 vmmpekpl 168 10334 0 10282 3 0 3 3 0 8 0 vmmpepl 168 79475 0 77522 109 2 107 107 0 357 13 vmsppl 488 1145 0 1113 5 0 5 5 0 8 0 rwobjpl 80 23670 0 22510 33 1 32 32 0 8 2 pdppl 4096 2305 0 2230 104 29 75 87 0 8 0 pvpl 32 17121 0 0 138 0 138 138 0 265 0 pmappl 256 1148 0 1114 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 297 0 35 8 0 8 8 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(ffffffff833a3608) at panic+0x1e5 sys/kern/subr_prf.c:198 __assert(ffffffff833de253,ffffffff8342901c,13c,ffffffff8331ca90) at __assert+0x29 sys/kern/subr_prf.c:-1 tun_clone_destroy(ffff80000161d000) at tun_clone_destroy+0x38a if_clone_destroy(ffff80003c472ef0) at if_clone_destroy+0x205 sys/net/if.c:1412 ifioctl(ffff8000014ab518,80206979,ffff80003c472ef0,ffff8000fffeefa8) at ifioctl+0x59d sys/net/if.c:2089 sys_ioctl(ffff8000fffeefa8,ffff80003c4730d0,ffff80003c473020) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c4730d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4730d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x730de1399840, count: -9 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: 10 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 acpicpu_idle() at acpicpu_idle+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299edff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5