witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd806c670198 vmmaplk (&map->lock) lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269 #2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #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 lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ifioctl_get+0x2dd #9 soo_ioctl+0x26c #10 sys_ioctl+0x4a2 #11 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806c670198,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806c670198,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806c670188) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e382ef0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e382ef0,ffff80002e382f28,ffff80002e382f50) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806c670180,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e383080,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e383080) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff80002e383330) at ifioctl_get+0x2dd soo_ioctl(fffffd806e3cb428,c0106924,ffff80002e383330,ffff80002af3a2a8) at soo_ioctl+0x26c sys_ioctl(ffff80002af3a2a8,ffff80002e383448,ffff80002e3834a0) at sys_ioctl+0x4a2 syscall(ffff80002e383510) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e383510) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782e4fba860, count: -15 ddb{1}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff80002e382be0 rbx 0x3 rdx 0 rcx 0 rax 0xffff80002af3a2a8 r8 0xffff80002e382b50 r9 0x8080808080808080 r10 0x5b43014019e6da4 r11 0xe90d4cbb03df40b1 r12 0xffffffff82ab0380 w_lodata+0x52a10 r13 0 r14 0xffffffff82aa3540 w_lodata+0x45bd0 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e382bd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.5) pid=459576 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff80002af3a008,0xffff80002af3a558 process=0xffff80002af2a160 user=0xffff80002e37e000, vmspace=0xfffffd806c670180 estcpu=32, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 21105 190430 69820 32767 2 0x10 syz-executor.5 *21105 459576 69820 32767 7 0x4000010 syz-executor.5 21105 143124 69820 32767 2 0x4000010 syz-executor.5 79885 163920 94048 32767 7 0x10 syz-executor.2 79885 436133 94048 32767 3 0x4000090 fsleep syz-executor.2 93763 245545 34220 32767 3 0x90 nanoslp syz-executor.3 93763 387551 34220 32767 3 0x4000090 fsleep syz-executor.3 93763 57372 34220 32767 3 0x4000090 nanoslp syz-executor.3 93763 488753 34220 32767 3 0x4000090 fsleep syz-executor.3 94290 221854 40914 32767 3 0x90 nanoslp syz-executor.6 94290 372834 40914 32767 3 0x4000090 netcon2 syz-executor.6 94290 429549 40914 32767 3 0x4000090 fsleep syz-executor.6 94290 417772 40914 32767 3 0x4000090 fsleep syz-executor.6 34220 35803 89967 32767 3 0x90 nanoslp syz-executor.3 89967 386581 34339 0 3 0x82 wait syz-executor.3 88333 312786 0 0 3 0x14200 bored sosplice 35211 354199 9480 32767 3 0x10 biowait syz-executor.7 42080 395349 57886 32767 3 0x90 nanoslp syz-executor.4 9480 293536 34339 0 3 0x82 wait syz-executor.7 57886 443893 34339 0 3 0x82 wait syz-executor.4 69820 167904 43242 32767 3 0x90 nanoslp syz-executor.5 40914 339840 15174 32767 3 0x90 nanoslp syz-executor.6 15174 130766 34339 0 3 0x82 wait syz-executor.6 43242 35068 34339 0 3 0x82 wait syz-executor.5 94048 169344 93029 32767 3 0x90 nanoslp syz-executor.2 35812 406008 37263 32767 2 0x10 syz-executor.1 93029 3828 34339 0 3 0x82 wait syz-executor.2 37263 10908 34339 0 3 0x82 wait syz-executor.1 95379 237836 30641 32767 3 0x90 nanoslp syz-executor.0 30641 118633 34339 0 3 0x82 wait syz-executor.0 34339 40416 35638 0 3 0x82 thrsleep syz-fuzzer 34339 32329 35638 0 3 0x4000082 nanoslp syz-fuzzer 34339 168879 35638 0 3 0x4000082 thrsleep syz-fuzzer 34339 435154 35638 0 3 0x4000082 thrsleep syz-fuzzer 34339 19329 35638 0 3 0x4000082 thrsleep syz-fuzzer 34339 226580 35638 0 3 0x4000082 thrsleep syz-fuzzer 34339 299156 35638 0 3 0x4000082 kqread syz-fuzzer 34339 319278 35638 0 3 0x4000082 thrsleep syz-fuzzer 34339 359980 35638 0 3 0x4000082 nanoslp syz-fuzzer 35638 192935 73514 0 3 0x10008a sigsusp ksh 73514 443905 99727 0 3 0x9a kqread sshd 5957 476208 1 0 3 0x100083 ttyin getty 99727 98639 1 0 3 0x88 kqread sshd 37259 214020 10143 73 3 0x1100090 kqread syslogd 10143 514083 1 0 3 0x100082 netio syslogd 20509 221319 1 0 3 0x100080 kqread resolvd 13570 457433 2033 77 3 0x100092 kqread dhcpleased 24339 84265 2033 77 3 0x100092 kqread dhcpleased 2033 78386 1 0 3 0x80 kqread dhcpleased 69859 111810 0 0 3 0x14200 bored smr 39230 519606 0 0 2 0x14200 zerothread 47006 259036 0 0 3 0x14200 aiodoned aiodoned 6138 224818 0 0 3 0x14200 syncer update 44322 504639 0 0 3 0x14200 cleaner cleaner 16748 347420 0 0 3 0x14200 reaper reaper 75170 58552 0 0 3 0x14200 pgdaemon pagedaemon 98388 499386 0 0 3 0x14200 bored viomb 24887 515740 0 0 3 0x40014200 acpi0 acpi0 43555 38929 0 0 3 0x40014200 idle1 71271 262777 0 0 3 0x14200 bored softnet 56782 56065 0 0 3 0x14200 bored systqmp 94606 452094 0 0 3 0x14200 bored systq 57814 423841 0 0 3 0x40014200 bored softclock 28293 203006 0 0 3 0x40014200 idle0 1 183906 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21105 (syz-executor.5) thread 0xffff80002af3a2a8 (459576) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x2d5 sys/net/if.c:2319 #2 soo_ioctl+0x26c #3 sys_ioctl+0x4a2 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988) #0 witness_lock+0x44d #1 soo_ioctl+0x25a sys/kern/sys_socket.c:136 #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 Process 79885 (syz-executor.2) thread 0xffff80002af3aa88 (163920) shared rwlock vmmaplk r = 0 (0xfffffd806c670e88) #0 witness_lock+0x44d #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 Process 35211 (syz-executor.7) thread 0xffff8000fffee548 (354199) exclusive rrwlock inode r = 0 (0xfffffd80670a20a8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347 #6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394 #7 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #8 VOP_MKDIR+0xbf sys/kern/vfs_vops.c:404 #9 domkdirat+0x121 sys/kern/vfs_syscalls.c:3101 #10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd80679a10a0) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3086 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10194 6410K 6419K 78643K 11291 0 pcb 13 10K 12K 78643K 15 0 rtable 254 7K 7K 78643K 559 0 ifaddr 81 16K 16K 78643K 96 0 sysctl 1 1K 1K 78643K 1 0 counters 56 35K 35K 78643K 60 0 ioctlops 0 0K 2K 78643K 135 0 iov 0 0K 20K 78643K 391 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 1954 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 18 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 81 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 129K 78643K 5653 0 sigio 0 0K 0K 78643K 191 0 proc 56 74K 111K 78643K 732 0 subproc 104 6K 6K 78643K 130 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 275 0 in_multi 99 6K 6K 78643K 187 0 ether_multi 1 0K 0K 78643K 25 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 181 811K 811K 78643K 181 0 exec 0 0K 2K 78643K 1375 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 375 88K 102K 78643K 73205 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 97 0 NDP 11 0K 2K 78643K 33 0 temp 125 4707K 4835K 78643K 17814 0 kqueue 13 20K 24K 78643K 275 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 6848 0 6842 22 17 5 6 0 8 4 rtentry 112 144 0 26 4 0 4 4 0 8 0 unpcb 136 3015 0 3002 36 33 3 9 0 8 2 syncache 296 26 0 26 8 8 0 1 0 8 0 tcpqe 32 332 0 332 2 2 0 1 0 8 0 tcpcb 736 1415 0 1408 36 31 5 14 0 8 4 arp 120 22 0 4 1 0 1 1 0 8 0 ipq 40 7 0 7 1 1 0 1 0 8 0 ipqe 40 88 0 88 1 1 0 1 0 8 0 inpcb 304 3043 0 3030 44 39 5 11 0 8 4 ip6q 72 4 0 4 2 2 0 1 0 8 0 ip6af 40 8 0 8 2 2 0 1 0 8 0 nd6 48 41 0 9 1 0 1 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 575 0 105 31 1 30 31 0 8 0 art_table 32 576 0 105 4 0 4 4 0 8 0 art_node 16 143 0 35 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8498 0 7065 90 0 90 90 0 8 0 ffsino 272 8498 0 7065 96 0 96 96 0 8 0 nchpl 144 15914 0 14291 62 0 62 62 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 45239 0 45238 3 2 1 2 0 8 0 percpumem 16 42 0 2 1 0 1 1 0 8 0 scxspl 216 47026 0 47025 15 14 1 8 0 8 0 plimitpl 152 296 0 274 3 2 1 2 0 8 0 sigapl 424 5927 0 5877 7 0 7 7 0 8 0 futexpl 64 42930 0 42925 2 1 1 1 0 8 0 knotepl 120 438 0 0 11 0 11 11 0 8 0 kqueuepl 216 1051 0 1042 12 7 5 5 0 8 4 pipepl 336 1463 0 1435 35 29 6 10 0 8 3 fdescpl 496 5912 0 5878 7 2 5 6 0 8 0 filepl 152 34389 0 34140 63 48 15 19 0 8 5 lockfpl 104 515 0 513 1 0 1 1 0 8 0 lockfspl 48 133 0 131 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 35 0 19 1 0 1 1 0 8 0 ucredpl 96 3703 0 3685 1 0 1 1 0 8 0 zombiepl 144 5879 0 5877 1 0 1 1 0 8 0 processpl 1064 5927 0 5877 5 1 4 4 0 8 0 procpl 672 15909 0 15842 12 5 7 8 0 8 0 sosppl 168 57 0 55 8 7 1 1 0 8 0 sockpl 480 12984 0 12952 237 217 20 34 0 8 14 mcl64k 65536 20 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 254 0 0 23 0 23 23 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 743 0 0 38 0 38 38 0 8 0 bufpl 288 10584 0 4249 453 0 453 453 0 8 0 anonpl 24 1623180 0 1609087 166 54 112 113 0 186 13 amapchunkpl 152 176588 0 175791 67 31 36 45 0 158 2 amappl16 200 14882 0 14519 63 31 32 32 0 8 12 amappl15 192 804 0 798 1 0 1 1 0 8 0 amappl14 184 1402 0 1397 2 1 1 1 0 8 0 amappl13 176 741 0 737 1 0 1 1 0 8 0 amappl12 168 622 0 617 2 1 1 1 0 8 0 amappl11 160 46 0 35 1 0 1 1 0 8 0 amappl10 152 1425 0 1418 1 0 1 1 0 8 0 amappl9 144 1162 0 1158 1 0 1 1 0 8 0 amappl8 136 1565 0 1460 4 0 4 4 0 8 0 amappl7 128 862 0 847 1 0 1 1 0 8 0 amappl6 120 893 0 869 2 1 1 2 0 8 0 amappl5 112 6771 0 6748 1 0 1 1 0 8 0 amappl4 104 1627 0 1600 2 0 2 2 0 8 0 amappl3 96 1472 0 1456 1 0 1 1 0 8 0 amappl2 88 2126 0 2077 3 1 2 3 0 8 0 amappl1 80 108339 0 107699 18 3 15 18 0 8 0 amappl 88 72596 0 72338 7 0 7 7 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 5912 0 5878 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5912 0 5878 1 0 1 1 0 8 0 vmmpekpl 168 46743 0 46700 3 0 3 3 0 8 0 vmmpepl 168 539571 0 536949 163 29 134 134 0 357 11 vmsppl 368 5911 0 5878 5 1 4 5 0 8 0 rwobjpl 56 135386 0 127964 112 3 109 109 0 8 3 pdppl 4096 11831 0 11756 162 81 81 97 0 8 6 pvpl 32 2837786 0 2818297 307 109 198 248 0 265 31 pmappl 248 5911 0 5878 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 992 0 148 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff829baff0) 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 __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002407a900,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc intr_handler(ffff80002407aa60,ffff80000004ad00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148 __mp_lock(ffffffff829de780) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x133 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd806c670e70,fe6432b8000,0,1) at uvm_fault+0x191 sys/uvm/uvm_fault.c:624 upageflttrap(ffff80002407af40,fe6432b8000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff80002407af40) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd0fb0, count: -18 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 witness_checkorder(fffffd806c670198,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd806c670198,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd806c670188) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff80002e382ef0,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff80002e382ef0,ffff80002e382f28,ffff80002e382f50) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd806c670180,20000000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff80002e383080,20000300) at kpageflttrap+0x209 kerntrap(ffff80002e383080) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff80002e383330) at ifioctl_get+0x2dd soo_ioctl(fffffd806e3cb428,c0106924,ffff80002e383330,ffff80002af3a2a8) at soo_ioctl+0x26c sys_ioctl(ffff80002af3a2a8,ffff80002e383448,ffff80002e3834a0) at sys_ioctl+0x4a2 syscall(ffff80002e383510) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e383510) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x782e4fba860, count: -15