witness: lock order reversal: 1st 0xffffffff829bb660 pf_lock (pf_lock) 2nd 0xffffffff829701b0 netlock (netlock) lock order "netlock"(rwlock) -> "pf_lock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 pfioctl+0x417c sys/net/pf_ioctl.c:2964 #2 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #3 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #4 sys_ioctl+0x4a2 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 lock order "pf_lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 uvn_io+0x418 sys/uvm/uvm_vnode.c:1245 #2 uvn_get+0x1df sys/uvm/uvm_vnode.c:1078 #3 uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 #4 uvm_fault+0x248 #5 kpageflttrap+0x209 #6 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #7 alltraps_kern_meltdown+0x7b #8 copyout+0x53 #9 pfioctl+0x4516 sys/net/pf_ioctl.c:2932 #10 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #11 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #12 sys_ioctl+0x4a2 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffffffff829701b0,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffffffff829701b0,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(ffffffff829701a0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 uvn_io(fffffd806887b420,ffff800028ee78d8,1,202,0) at uvn_io+0x418 sys/uvm/uvm_vnode.c:1245 uvn_get(fffffd806887b420,0,ffff800028ee7998,ffff800028ee7968,0,0,751f6c943269987b,1) at uvn_get+0x1df sys/uvm/uvm_vnode.c:1078 uvm_fault_lower(ffff800028ee7b00,ffff800028ee7b38,ffff800028ee7a80,0) at uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 uvm_fault(fffffd807030c5d0,20001000,0,2) at uvm_fault+0x248 kpageflttrap(ffff800028ee7c90,20001000) at kpageflttrap+0x209 kerntrap(ffff800028ee7c90) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 pfioctl(4900,c0284457,ffff800028ee8100,1,ffff8000ffff2548) at pfioctl+0x4516 sys/net/pf_ioctl.c:2932 VOP_IOCTL(fffffd806f681b88,c0284457,ffff800028ee8100,1,fffffd807f7d7480,ffff8000ffff2548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8076f74b60,c0284457,ffff800028ee8100,ffff8000ffff2548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000ffff2548,ffff800028ee8218,ffff800028ee8270) at sys_ioctl+0x4a2 syscall(ffff800028ee82e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028ee82e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3d026f6e8e0, count: -17 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800028ee76a0 rbx 0x3 rdx 0xffff800000bf1e80 rcx 0 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffff800028ee7610 r9 0x8080808080808080 r10 0x7ac5fdbec3007e2d r11 0xfe6eda93d733a41b r12 0xffffffff82b11bf0 w_lodata+0x52ac0 r13 0 r14 0xffffffff82b03e90 w_lodata+0x44d60 r15 0xfffffd8002f76840 rip 0xffffffff81ad9118 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800028ee7690 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.4) pid=495226 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff2008,0xffffffff82b1e8c8 process=0xffff8000fffed908 user=0xffff800028ee3000, vmspace=0xfffffd807030c5d0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18193 50191 58148 0 2 0 syz-executor.4 *18193 495226 58148 0 7 0x4000000 syz-executor.4 26926 129241 68170 0 3 0x80 nanoslp syz-executor.7 26926 341971 68170 0 3 0x4000080 lockf syz-executor.7 26926 158584 68170 0 3 0x4000080 fsleep syz-executor.7 46988 258773 45914 0 3 0x82 nanoslp syz-executor.5 96721 31246 1 0 3 0x100083 ttyin getty 63723 129789 45914 0 3 0x82 piperd syz-executor.6 63373 434870 45914 0 3 0x82 nanoslp syz-executor.0 63658 336837 0 0 3 0x14200 bored sosplice 12432 86814 45914 0 3 0x82 nanoslp syz-executor.2 75388 260160 45914 0 3 0x82 piperd syz-executor.3 58148 140836 45914 0 3 0x82 nanoslp syz-executor.4 68170 343828 45914 0 3 0x82 nanoslp syz-executor.7 96508 84823 45914 0 3 0x82 piperd syz-executor.1 45914 260215 13606 0 3 0x82 thrsleep syz-fuzzer 45914 336066 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 363782 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 364733 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 1881 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 132788 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 64200 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 260432 13606 0 3 0x4000082 thrsleep syz-fuzzer 45914 271407 13606 0 3 0x4000082 kqread syz-fuzzer 13606 28978 19695 0 3 0x10008a sigsusp ksh 19695 459739 18593 0 3 0x9a kqread sshd 18593 222973 1 0 3 0x88 kqread sshd 23282 412084 87495 74 3 0x1100092 bpf pflogd 87495 118189 1 0 3 0x80 netio pflogd 50738 70453 8557 73 3 0x1100090 kqread syslogd 8557 131307 1 0 3 0x100082 netio syslogd 90514 208412 1 0 3 0x100080 kqread resolvd 35175 258805 30411 77 3 0x100092 kqread dhcpleased 86574 422135 30411 77 3 0x100092 kqread dhcpleased 30411 183217 1 0 3 0x80 kqread dhcpleased 17297 226062 0 0 3 0x14200 bored smr 49269 131290 0 0 2 0x14200 zerothread 29110 156027 0 0 3 0x14200 aiodoned aiodoned 70676 329666 0 0 3 0x14200 syncer update 13750 437512 0 0 3 0x14200 cleaner cleaner 67601 507063 0 0 3 0x14200 reaper reaper 45407 205826 0 0 3 0x14200 pgdaemon pagedaemon 8901 248796 0 0 3 0x14200 bored viomb 98960 93162 0 0 3 0x40014200 acpi0 acpi0 23693 55032 0 0 7 0x40014200 idle1 32608 178562 0 0 3 0x14200 bored softnet 97005 180070 0 0 3 0x14200 bored systqmp 1079 462112 0 0 3 0x14200 bored systq 67388 48753 0 0 3 0x40014200 bored softclock 89319 260604 0 0 3 0x40014200 idle0 1 126659 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 18193 (syz-executor.4) thread 0xffff8000ffff2548 (495226) exclusive rwlock pf_lock r = 0 (0xffffffff829bb660) #0 witness_lock+0x44d #1 pfioctl+0x4504 sys/net/pf_ioctl.c:2931 #2 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #3 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #4 sys_ioctl+0x4a2 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 shared rwlock pfioctl_rw r = 0 (0xffffffff829bb6c0) #0 witness_lock+0x44d #1 pfioctl+0x946 sys/net/pf_ioctl.c:1150 #2 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #3 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #4 sys_ioctl+0x4a2 #5 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82b9a8a8) #0 witness_lock+0x44d #1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514 #2 sys_ioctl+0x4a2 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 6685K 7397K 78643K 25964 0 pcb 13 12K 14K 78643K 389 0 rtable 207 8K 11K 78643K 884 0 ifaddr 89 18K 20K 78643K 249 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 35K 78643K 84 0 ioctlops 0 0K 4K 78643K 7824 0 iov 0 0K 16K 78643K 158 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1399 87K 88K 78643K 4953 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 26 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 288 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 89K 78643K 4943 0 sigio 0 0K 0K 78643K 23 0 proc 70 91K 128K 78643K 866 0 subproc 104 6K 6K 78643K 221 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 140 0 in_multi 82 5K 6K 78643K 226 0 ether_multi 1 0K 0K 78643K 12 0 mrt 1 0K 0K 78643K 12 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 85 387K 387K 78643K 85 0 exec 0 0K 2K 78643K 1254 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 258 103K 111K 78643K 28129 0 UVM aobj 49 2K 2K 78643K 54 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 63 0 NDP 14 0K 1K 78643K 61 0 temp 132 4736K 4814K 78643K 76560 0 kqueue 12 18K 25K 78643K 190 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 255 0 252 5 2 3 3 0 8 2 rtentry 112 238 0 148 4 0 4 4 0 8 0 unpcb 136 2807 0 2790 35 32 3 6 0 8 2 syncache 296 13 0 13 4 3 1 1 0 8 1 tcpqe 32 299 0 299 2 2 0 2 0 8 0 tcpcb 736 1054 0 1050 45 38 7 10 0 8 6 arp 120 42 0 24 1 0 1 1 0 8 0 inpcb 312 2291 0 2284 53 47 6 9 0 8 5 nd6 48 53 0 33 1 0 1 1 0 8 0 pkpcb 40 8 0 8 2 2 0 1 0 8 0 kcovpl 48 17 0 9 1 0 1 1 0 8 0 pffrag 232 6 0 5 2 1 1 1 0 482 0 pffrnode 88 6 0 5 2 1 1 1 0 8 0 pffrent 40 52 0 51 2 1 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 82 0 78 1 0 1 1 0 8 0 pftag 88 6 0 3 1 0 1 1 0 8 0 pfstitem 24 26 0 24 1 0 1 1 0 8 0 pfstkey 112 30 0 28 1 0 1 1 0 8 0 pfstate 336 28 0 26 2 1 1 2 0 8 0 pfrule 1360 887 0 697 17 1 16 16 0 8 0 rttmrq 48 31 0 27 1 0 1 1 0 8 0 rttmr 72 4 0 4 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 957 0 591 31 5 26 29 0 8 1 art_table 32 958 0 591 4 0 4 4 0 8 0 art_node 16 237 0 157 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 19 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 284 0 274 1 0 1 1 0 8 0 shmpl 112 51 0 5 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6918 0 5464 91 0 91 91 0 8 0 ffsino 272 6918 0 5464 97 0 97 97 0 8 0 nchpl 144 12899 0 11256 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 48629 0 48629 4 3 1 2 0 8 1 percpumem 16 54 0 14 1 0 1 1 0 8 0 vcpupl 2048 1 0 0 1 0 1 1 0 8 0 vmpool 560 12 0 11 2 1 1 1 0 8 0 pfiaddrpl 120 26 0 22 1 0 1 1 0 8 0 kstatmem 264 52 0 28 2 0 2 2 0 8 0 scxspl 216 37755 0 37755 12 11 1 8 0 8 1 plimitpl 152 189 0 174 1 0 1 1 0 8 0 sigapl 424 5240 0 5197 6 0 6 6 0 8 0 futexpl 64 43158 0 43157 1 0 1 1 0 8 0 knotepl 120 380 0 0 8 0 8 8 0 8 0 kqueuepl 216 683 0 673 16 15 1 8 0 8 0 pipepl 336 990 0 961 24 20 4 8 0 8 0 fdescpl 496 5225 0 5200 5 1 4 5 0 8 0 filepl 152 32204 0 31950 61 45 16 20 0 8 2 lockfpl 104 1379 0 1373 4 2 2 2 0 8 1 lockfspl 48 388 0 384 1 0 1 1 0 8 0 sessionpl 144 34 0 17 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 96 1789 0 1777 1 0 1 1 0 8 0 zombiepl 144 5200 0 5197 3 2 1 1 0 8 0 processpl 1064 5240 0 5197 4 0 4 4 0 8 0 procpl 672 12407 0 12353 11 5 6 7 0 8 0 srpgc 96 6 0 6 3 3 0 1 0 8 0 sosppl 168 6 0 6 2 2 0 1 0 8 0 sockpl 480 5361 0 5334 171 159 12 29 0 8 8 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 14 0 0 2 0 2 2 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 311 0 0 37 6 31 37 0 8 0 mtagpl 96 126 0 0 3 0 3 3 0 8 0 mbufpl 256 667 0 0 30 0 30 30 0 8 0 bufpl 288 9739 0 3406 453 0 453 453 0 8 0 anonpl 24 914417 0 899740 148 25 123 135 0 186 9 amapchunkpl 152 80225 0 79588 48 18 30 35 0 158 0 amappl16 200 11986 0 11425 47 16 31 44 0 8 0 amappl15 192 706 0 700 1 0 1 1 0 8 0 amappl14 184 747 0 744 1 0 1 1 0 8 0 amappl13 176 744 0 741 1 0 1 1 0 8 0 amappl12 168 23 0 20 1 0 1 1 0 8 0 amappl11 160 713 0 694 1 0 1 1 0 8 0 amappl10 152 862 0 851 1 0 1 1 0 8 0 amappl9 144 1624 0 1618 1 0 1 1 0 8 0 amappl8 136 1713 0 1646 3 0 3 3 0 8 0 amappl7 128 1057 0 1046 1 0 1 1 0 8 0 amappl6 120 1373 0 1353 2 1 1 2 0 8 0 amappl5 112 4321 0 4300 1 0 1 1 0 8 0 amappl4 104 2454 0 2428 2 0 2 2 0 8 0 amappl3 96 14771 0 14728 2 0 2 2 0 8 0 amappl2 88 6417 0 6358 3 1 2 3 0 8 0 amappl1 80 122894 0 122314 21 6 15 20 0 8 0 amappl 88 27465 0 27306 6 1 5 5 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 53 0 5 1 0 1 1 0 8 0 uaddrrnd 24 5237 0 5211 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5237 0 5211 1 0 1 1 0 8 0 vmmpekpl 168 38986 0 38934 3 0 3 3 0 8 0 vmmpepl 168 498339 0 496078 200 75 125 151 0 357 2 vmsppl 368 5236 0 5211 4 1 3 4 0 8 0 rwobjpl 56 123302 0 115785 114 6 108 111 0 8 0 pdppl 4096 10481 0 10423 375 305 70 81 0 8 12 pvpl 32 1890771 0 1872021 301 91 210 244 0 265 22 pmappl 248 5236 0 5211 4 2 2 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1278 0 429 25 0 25 25 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(ffffffff829701b0,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(ffffffff829701b0,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_write(ffffffff829701a0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 uvn_io(fffffd806887b420,ffff800028ee78d8,1,202,0) at uvn_io+0x418 sys/uvm/uvm_vnode.c:1245 uvn_get(fffffd806887b420,0,ffff800028ee7998,ffff800028ee7968,0,0,751f6c943269987b,1) at uvn_get+0x1df sys/uvm/uvm_vnode.c:1078 uvm_fault_lower(ffff800028ee7b00,ffff800028ee7b38,ffff800028ee7a80,0) at uvm_fault_lower+0x36c sys/uvm/uvm_fault.c:1275 uvm_fault(fffffd807030c5d0,20001000,0,2) at uvm_fault+0x248 kpageflttrap(ffff800028ee7c90,20001000) at kpageflttrap+0x209 kerntrap(ffff800028ee7c90) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 pfioctl(4900,c0284457,ffff800028ee8100,1,ffff8000ffff2548) at pfioctl+0x4516 sys/net/pf_ioctl.c:2932 VOP_IOCTL(fffffd806f681b88,c0284457,ffff800028ee8100,1,fffffd807f7d7480,ffff8000ffff2548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8076f74b60,c0284457,ffff800028ee8100,ffff8000ffff2548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000ffff2548,ffff800028ee8218,ffff800028ee8270) at sys_ioctl+0x4a2 syscall(ffff800028ee82e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800028ee82e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3d026f6e8e0, count: -17 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5