witness: shared lock of (rwlock) maddr while exclusively locked panic: excl->share Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *328028 32240 0 0x14000 0x200 0 softclockmp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001597078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001597060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076b3e800,ffffffff839eee58,0,0,ffff80002a1fe5e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a1580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: 3 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: excl->share ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001597078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001597060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076b3e800,ffffffff839eee58,0,0,ffff80002a1fe5e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a1580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a1fe230 rbx 0xffffffff837e4e07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff8000ffffe530 rax 0xffffffff837e3ff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xcab1921e4c173e5c r11 0x3bf6cc13b0e8b120 r12 0xffffffff837e4c08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff810e0165 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a1fe220 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (softclockmp) tid=328028 pid=32240 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=0, usrpri=50, slppri=0, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffe7c8,0xffff8000ffffe010 process=0xffff8000ffff9810 user=0xffff80002a1f9000, vmspace=0xffffffff83a0c438 estcpu=0, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 27755 58363 57698 0 2 0 syz-executor 27755 112608 57698 0 3 0x4000080 fsleep syz-executor 1692 353745 10685 0 2 0 syz-executor 1692 370839 10685 0 2 0x4000080 syz-executor 1692 131183 10685 0 3 0x4000080 fsleep syz-executor 58042 284869 30419 0 2 0 syz-executor 58042 26904 30419 0 3 0x4000080 fsleep syz-executor 26501 159296 16927 0 2 0 syz-executor 26501 102808 16927 0 3 0x4000080 fsleep syz-executor 73484 132000 75626 0 2 0 syz-executor 73484 165018 75626 0 2 0x4000000 syz-executor 22109 229449 20679 0 2 0 syz-executor 22109 211305 20679 0 3 0x4000080 fsleep syz-executor 99693 31754 55412 0 2 0x10 syz-executor 99693 521921 55412 0 3 0x4000090 sbwait syz-executor 99693 148672 55412 0 3 0x4000090 fsleep syz-executor 36880 235573 55190 60929 2 0xc90 syz-executor 36880 276431 55190 60929 3 0x4000090 kqsel syz-executor 36880 224816 55190 60929 3 0x4000090 fsleep syz-executor 91659 494791 0 0 3 0x14200 acct acct 53409 440789 1 0 3 0x100083 ttyin getty 30419 33116 9972 0 2 0xc82 syz-executor 57698 229316 9972 0 3 0x82 nanoslp syz-executor 16927 222584 9972 0 3 0x82 nanoslp syz-executor 20679 330884 9972 0 2 0x2 syz-executor 75626 409344 9972 0 3 0x82 nanoslp syz-executor 55190 390035 9972 0 2 0xc82 syz-executor 10685 223193 9972 0 2 0xc82 syz-executor 55412 411727 9972 0 2 0xc82 syz-executor 9972 513150 53893 0 3 0x82 kqread syz-executor 53893 282318 43953 0 3 0x10008a sigsusp ksh 43953 35748 71720 0 3 0x98 kqread sshd-session 71720 464649 72318 0 3 0x92 kqread sshd-session 72318 317724 1 0 3 0x88 kqread sshd 73867 183662 29939 74 3 0x1100092 bpf pflogd 29939 8561 1 0 3 0x80 sbwait pflogd 77104 286881 35561 73 3 0x1100090 kqread syslogd 35561 74003 1 0 3 0x100082 sbwait syslogd 27863 78986 1 0 3 0x100080 kqread resolvd 47098 109075 19762 77 3 0x100092 kqread dhcpleased 61177 134891 19762 77 3 0x100092 kqread dhcpleased 19762 282858 1 0 3 0x80 kqread dhcpleased 2275 379398 0 0 3 0x14200 bored smr 73461 250926 0 0 2 0x14200 zerothread 36070 389047 0 0 3 0x14200 aiodoned aiodoned 53087 40411 0 0 3 0x14200 syncer update 50907 357695 0 0 3 0x14200 cleaner cleaner 23755 282207 0 0 3 0x14200 reaper reaper 21336 512492 0 0 3 0x14200 pgdaemon pagedaemon 25726 307169 0 0 3 0x14200 bored viomb 90103 166586 0 0 3 0x40014200 acpi0 acpi0 73441 166845 0 0 7 0x40014200 idle1 86408 235947 0 0 3 0x14200 bored softnet1 68637 429513 0 0 3 0x14200 bored softnet0 80609 74140 0 0 3 0x14200 smrbar systqmp 67771 175546 0 0 3 0x14200 bored systq *32240 328028 0 0 7 0x14200 softclockmp 62538 364474 0 0 3 0x40014200 tmoslp softclock 34453 44543 0 0 3 0x40014200 idle0 1 173497 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 80609 (systqmp) thread 0xffff8000ffffe298 (74140) shared rwlock systqmp r = 0 (0xffffffff83892ca8) #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 32240 (softclockmp) thread 0xffff8000ffffe530 (328028) exclusive rwlock maddr r = 0 (0xffff800001597078) #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 mld6_fasttimo+0x8c mld6_checktimer sys/netinet6/mld6.c:-1 [inline] #2 mld6_fasttimo+0x8c sys/netinet6/mld6.c:369 #3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1 #4 timeout_run+0x159 sys/kern/kern_timeout.c:698 #5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #6 softclock_thread_mp+0x86 #7 proc_trampoline+0x10 shared rwlock netlock r = 0 (0xffffffff83891cc0) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 mld6_fasttimo+0x5f sys/netinet6/mld6.c:-1 #3 pffasttimo+0x184 sys/kern/uipc_domain.c:-1 #4 timeout_run+0x159 sys/kern/kern_timeout.c:698 #5 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #6 softclock_thread_mp+0x86 #7 proc_trampoline+0x10 shared rwlock timeout r = 0 (0xffffffff83835d78) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 timeout_run+0x131 sys/kern/kern_timeout.c:694 #2 softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 #3 softclock_thread_mp+0x86 #4 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11098 16271K 16271K 166960K 12489 0 pcb 18 12K 12K 166960K 45 0 rtable 227 7K 8K 166960K 411 0 pf 35 17K 18K 166960K 59 0 ifaddr 42 7K 8K 166960K 54 0 ifgroup 55 2K 2K 166960K 74 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1500 0 iov 0 0K 12K 166960K 7 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1371 86K 87K 166960K 1488 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 89K 166960K 253 0 proc 71 115K 164K 166960K 549 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 7 0 in_multi 96 7K 7K 166960K 103 0 ether_multi 2 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 1 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 383 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 251 167K 177K 166960K 4216 0 UVM aobj 7 6K 6K 166960K 9 0 pinsyscall 43 86K 104K 166960K 1381 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 7 0 NDP 12 0K 2K 166960K 33 0 temp 42 8670K 8734K 166960K 9661 0 kqueue 17 24K 28K 166960K 52 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 120 105 0 101 3 0 3 3 0 8 2 rtentry 176 115 0 14 6 0 6 6 0 8 0 unpcb 144 98 0 79 1 0 1 1 0 8 0 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 736 33 0 27 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 155 0 144 2 0 2 2 0 8 0 nd6 152 25 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 4 1 0 1 1 0 8 1 pppxif 1576 2 0 2 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 1 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 24 0 0 1 0 1 1 0 8 0 pfstkey 128 25 0 1 1 0 1 1 0 8 0 pfstate 448 25 0 1 3 0 3 3 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 479 0 6 30 0 30 30 0 8 0 art_table 40 481 0 6 5 0 5 5 0 8 0 art_node 32 115 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 2 1 0 1 1 0 8 1 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 4 0 2 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1799 0 284 96 0 96 96 0 8 0 ffsino 296 1799 0 284 118 0 118 118 0 8 0 nchpl 144 2154 0 453 64 0 64 64 0 8 0 vnodes 216 1963 0 0 110 0 110 110 0 8 0 namei 1024 7002 0 7002 2 0 2 2 0 8 2 percpumem 16 57 0 7 1 0 1 1 0 8 0 vcpupl 3968 2 0 0 1 0 1 1 0 8 0 vmpool 848 2 0 0 1 0 1 1 0 8 0 kstatmem 264 36 0 10 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 7035 0 7035 3 2 1 2 1 8 1 plimitpl 152 88 0 69 1 0 1 1 0 8 0 sigapl 424 563 0 514 7 0 7 7 0 8 1 knotepl 120 300 0 0 10 0 10 10 0 8 0 kqueuepl 224 60 0 46 2 0 2 2 0 8 1 pipepl 344 130 0 102 3 0 3 3 0 8 0 fdescpl 528 546 0 514 3 0 3 3 0 8 0 filepl 160 2706 0 2471 15 0 15 15 0 8 5 lockfpl 104 118 0 112 2 0 2 2 0 8 1 lockfspl 48 57 0 52 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 31 0 14 1 0 1 1 0 8 0 ucredpl 104 302 0 287 1 0 1 1 0 8 0 zombiepl 144 514 0 514 1 0 1 1 0 8 1 processpl 1232 563 0 514 5 0 5 5 0 8 0 procpl 664 749 0 689 6 0 6 6 0 8 0 sosppl 176 1 0 1 1 0 1 1 0 8 1 sockpl 752 359 0 325 10 0 10 10 0 8 6 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 50 0 0 7 0 7 7 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 4415 0 0 276 0 276 276 0 8 0 bufpl 280 2615 0 130 178 0 178 178 0 8 0 anonpl 32 8482 0 0 69 0 69 69 0 246 0 amapchunkpl 152 12664 0 12149 26 0 26 26 0 158 5 amappl16 200 2338 0 2306 16 6 10 15 0 8 7 amappl15 192 8 0 7 1 0 1 1 0 8 0 amappl14 184 8 0 8 1 1 0 1 0 8 0 amappl13 176 424 0 423 1 0 1 1 0 8 0 amappl12 168 912 0 869 3 0 3 3 0 8 0 amappl11 160 7 0 7 1 1 0 1 0 8 0 amappl10 152 54 0 40 1 0 1 1 0 8 0 amappl9 144 264 0 264 1 1 0 1 0 8 0 amappl8 136 27 0 25 1 0 1 1 0 8 0 amappl7 128 78 0 77 1 0 1 1 0 8 0 amappl6 120 280 0 267 1 0 1 1 0 8 0 amappl5 112 82 0 72 1 0 1 1 0 8 0 amappl4 104 415 0 387 1 0 1 1 0 8 0 amappl3 96 1994 0 1895 4 1 3 3 0 8 0 amappl2 88 658 0 582 2 0 2 2 0 8 0 amappl1 80 9596 0 8995 15 0 15 15 0 8 2 amappl 88 3456 0 3285 5 0 5 5 0 92 0 uvmvnodes 80 104 0 0 3 0 3 3 0 8 0 dma65536 65536 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 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 8 0 2 1 0 1 1 0 8 0 uaddrrnd 24 546 0 514 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 546 0 514 1 0 1 1 0 8 0 vmmpekpl 168 6226 0 6184 3 0 3 3 0 8 0 vmmpepl 168 42639 0 40668 97 0 97 97 0 357 11 vmsppl 488 545 0 514 5 0 5 5 0 8 1 rwobjpl 80 15109 0 14065 27 0 27 27 0 8 2 pdppl 4096 1104 0 1030 96 21 75 84 0 8 1 pvpl 32 15718 0 0 127 0 127 127 0 265 0 pmappl 256 547 0 514 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 541 0 24 15 0 15 15 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(ffffffff833b4a35) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_checkorder(ffff800001597078,1,0) at witness_checkorder+0x122c sys/kern/subr_witness.c:854 rw_do_enter_read(ffff800001597060,0) at rw_do_enter_read+0x99 sys/kern/kern_rwlock.c:355 in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 in6_lookupmulti sys/netinet6/in6.c:-1 [inline] in6_hasmulti(fffffd8076b3e8f0,ffff800001597000) at in6_hasmulti+0x41 sys/netinet6/in6.c:1150 ip6_output(fffffd8076b3e800,ffffffff839eee58,0,0,ffff80002a1fe5e0,0) at ip6_output+0x13bd sys/netinet6/ip6_output.c:507 mld6_sendpkt(ffff8000015a1580,83,0) at mld6_sendpkt+0x385 sys/netinet6/mld6.c:499 mld6_fasttimo() at mld6_fasttimo+0x16d mld6_checktimer sys/netinet6/mld6.c:395 [inline] mld6_fasttimo() at mld6_fasttimo+0x16d sys/netinet6/mld6.c:369 pffasttimo(ffffffff83a15020) at pffasttimo+0x184 sys/kern/uipc_domain.c:-1 timeout_run(ffffffff83835dd8,ffffffff83a15020) at timeout_run+0x159 sys/kern/kern_timeout.c:698 softclock_thread_run(ffffffff83835dd8) at softclock_thread_run+0xe7 sys/kern/kern_timeout.c:842 softclock_thread_mp(ffff8000ffffe530) at softclock_thread_mp+0x86 end trace frame: 0x0, count: -12 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+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 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+0x457 sys/dev/acpi/acpicpu_x86.c:1224 sched_idle(ffff8000299ddff0) at sched_idle+0x391 sys/kern/kern_sched.c:191 end trace frame: 0x0, count: -5