uvm_fault(0xfffffd8064d0a470, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi TID PID UID PRFLAGS PFLAGS CPU COMMAND *143341 86566 0 0 0x4000000 1K syz-executor.1 226896 86566 0 0 0x4000000 0 syz-executor.1 uvm_fault_lower(ffff8000246dfd10,ffff8000246dfd48,ffff8000246dfc90,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd8064d0a470,20001000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246dfea0,200013c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246dfea0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_pwritev(ffff800021262d30,ffff8000246e0118,ffff8000246e0170) at sys_pwritev+0x5a sys/kern/vfs_syscalls.c:3343 syscall(ffff8000246e01e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246e01e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c3c1744c20, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd8064d0a470, 0x0, 0, 1) -> e ddb{1}> trace uvm_fault_lower(ffff8000246dfd10,ffff8000246dfd48,ffff8000246dfc90,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd8064d0a470,20001000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246dfea0,200013c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246dfea0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_pwritev(ffff800021262d30,ffff8000246e0118,ffff8000246e0170) at sys_pwritev+0x5a sys/kern/vfs_syscalls.c:3343 syscall(ffff8000246e01e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246e01e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c3c1744c20, count: -9 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000246dfc00 rbx 0 rdx 0 rcx 0x8 rax 0xffff800021262d30 r8 0xffffffff81da849e witness_assert+0x1fe r9 0x5 r10 0xad8398ca3ac1c8de r11 0xf880a93e7a2dcdf5 r12 0xffff8000246dfd10 r13 0xfffffd8065dab328 r14 0 r15 0xffffffff81491a00 uvn_flush+0x8e0 rip 0xffffffff819e07c1 uvm_fault_lower+0xbb1 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff8000246dfb70 ss 0x10 uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi ddb{1}> show proc PROC (syz-executor.1) pid=143341 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021262a90,0xffff800021262800 process=0xffff80002468dd30 user=0xffff8000246db000, vmspace=0xfffffd8064d0a470 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86566 150271 39113 0 2 0 syz-executor.1 *86566 143341 39113 0 7 0x4000000 syz-executor.1 86566 25333 39113 0 2 0x4000080 syz-executor.1 86566 151247 39113 0 2 0x4000000 syz-executor.1 86566 243025 39113 0 2 0x4000000 syz-executor.1 86566 226896 39113 0 7 0x4000000 syz-executor.1 59570 47265 91755 0 3 0x82 nanoslp syz-executor.0 39113 321219 91755 0 3 0x82 nanoslp syz-executor.1 46745 277504 0 0 3 0x14280 nfsidl nfsio 1808 455311 0 0 3 0x14280 nfsidl nfsio 46170 476396 0 0 3 0x14280 nfsidl nfsio 20162 196517 0 0 3 0x14280 nfsidl nfsio 71651 380686 0 0 3 0x14280 nfsidl nfsio 11941 492536 0 0 3 0x14280 nfsidl nfsio 1764 429130 0 0 3 0x14280 nfsidl nfsio 93091 440175 0 0 3 0x14280 nfsidl nfsio 58866 335594 0 0 3 0x14280 nfsidl nfsio 26799 253544 0 0 3 0x14280 nfsidl nfsio 17243 442512 0 0 3 0x14280 nfsidl nfsio 41771 370400 0 0 3 0x14280 nfsidl nfsio 80316 181896 0 0 3 0x14280 nfsidl nfsio 68289 257104 0 0 3 0x14280 nfsidl nfsio 52398 17099 0 0 3 0x14280 nfsidl nfsio 54171 461876 0 0 3 0x14280 nfsidl nfsio 92465 425343 0 0 3 0x14280 nfsidl nfsio 67463 26629 0 0 3 0x14280 nfsidl nfsio 43286 513739 0 0 3 0x14280 nfsidl nfsio 75325 79562 0 0 3 0x14280 nfsidl nfsio 19397 214079 0 0 3 0x14200 bored sosplice 91755 163571 11155 0 3 0x82 thrsleep syz-fuzzer 91755 112881 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 141303 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 27200 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 492505 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 299468 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 242363 11155 0 3 0x4000082 thrsleep syz-fuzzer 91755 257364 11155 0 3 0x4000082 kqread syz-fuzzer 11155 207138 9290 0 3 0x10008a sigsusp ksh 9290 98210 19420 0 3 0x9a kqread sshd 74838 420448 1 0 3 0x100083 ttyin getty 19420 473440 1 0 3 0x88 kqread sshd 3668 333361 90101 74 3 0x100092 bpf pflogd 90101 158115 1 0 3 0x80 netio pflogd 61199 196124 54912 73 3 0x100090 kqread syslogd 54912 174190 1 0 3 0x100082 netio syslogd 53851 34200 1 0 3 0x100080 kqread resolvd 8139 7812 27441 77 3 0x100092 kqread dhcpleased 81153 212820 27441 77 3 0x100092 kqread dhcpleased 27441 221591 1 0 3 0x80 kqread dhcpleased 7922 106182 0 0 3 0x14200 bored smr 26712 284208 0 0 2 0x14200 zerothread 89182 171615 0 0 3 0x14200 aiodoned aiodoned 19339 413795 0 0 3 0x14200 syncer update 67150 515295 0 0 3 0x14200 cleaner cleaner 31588 341372 0 0 3 0x14200 reaper reaper 76661 200533 0 0 3 0x14200 pgdaemon pagedaemon 31749 383338 0 0 3 0x14200 bored viomb 10311 238215 0 0 3 0x40014200 acpi0 acpi0 51184 520648 0 0 3 0x40014200 idle1 23683 60005 0 0 3 0x14200 bored softnet 5197 128374 0 0 3 0x14200 bored systqmp 40683 155863 0 0 3 0x14200 bored systq 76583 412292 0 0 3 0x40014200 bored softclock 6746 74786 0 0 3 0x40014200 idle0 1 406451 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 86566 (syz-executor.1) thread 0xffff800021262d30 (143341) exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829f2050) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault+0x233 sys/uvm/uvm_fault.c:639 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #4 alltraps_kern_meltdown+0x7b #5 copyin+0x53 #6 sys_pwritev+0x5a sys/kern/vfs_syscalls.c:3343 #7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #8 Xsyscall+0x128 Process 86566 (syz-executor.1) thread 0xffff800021256a80 (226896) exclusive rwlock amaplk r = 0 (0xfffffd80764c6748) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault_check+0x3d2 sys/uvm/uvm_fault.c:776 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd8064d0a488) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvmfault_lookup+0xe9 sys/uvm/uvm_fault.c:1745 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:676 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10168 6480K 6860K 78643K 18263 0 pcb 13 16K 18K 78643K 1086 0 rtable 105 15K 15K 78643K 3497 0 ifaddr 58 14K 15K 78643K 857 0 counters 46 34K 35K 78643K 272 0 ioctlops 0 0K 4K 78643K 2443 0 iov 0 0K 16K 78643K 696 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1290 81K 81K 78643K 4342 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 59 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1038 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 6757 0 sigio 0 0K 0K 78643K 66 0 proc 74 87K 111K 78643K 1498 0 subproc 26 1K 1K 78643K 429 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 290 0 in_multi 20 1K 2K 78643K 711 0 ether_multi 1 0K 0K 78643K 94 0 mrt 1 0K 0K 78643K 23 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 2K 78643K 1875 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 349 477K 481K 78643K 88467 0 UVM aobj 118 4K 4K 78643K 147 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 489 0 NDP 8 0K 0K 78643K 212 0 temp 102 4220K 4290K 78643K 78500 0 kqueue 12 18K 24K 78643K 321 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 120 556 0 553 6 5 1 3 0 8 0 rtentry 112 939 0 909 2 0 2 2 0 8 0 unpcb 128 5198 0 5183 56 55 1 7 0 8 0 syncache 296 32 0 32 10 10 0 1 0 8 0 tcpqe 32 15 0 15 6 6 0 1 0 8 0 tcpcb 736 2104 0 2100 86 84 2 8 0 8 1 arp 120 220 0 214 1 0 1 1 0 8 0 inpcb 304 8681 0 8672 113 107 6 11 0 8 5 rttmr 72 5 0 5 2 2 0 1 0 8 0 nd6 48 126 0 122 1 0 1 1 0 8 0 pkpcb 40 90 0 90 5 5 0 1 0 8 0 kcovpl 48 33 0 31 1 0 1 1 0 8 0 ppxss 1248 21 0 21 7 7 0 1 0 8 0 pfstscr 40 6 0 6 2 2 0 1 0 8 0 pffrag 232 81 0 80 6 5 1 1 0 482 0 pffrnode 88 81 0 80 6 5 1 1 0 8 0 pffrent 40 552 0 551 8 7 1 1 0 8 0 pfosfp 40 1431 0 1007 5 0 5 5 0 8 0 pfosfpen 112 1431 0 714 21 0 21 21 0 8 0 pfrktable 1344 124 0 117 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfqueue 264 10 0 10 4 4 0 1 0 8 0 pfstitem 24 22 0 20 1 0 1 1 0 8 0 pfstkey 112 27 0 25 1 0 1 1 0 8 0 pfstate 320 26 0 24 2 1 1 2 0 8 0 pfsrctr 152 51 0 50 7 6 1 1 0 8 0 pfrule 1360 615 0 559 7 2 5 5 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3062 0 2949 25 16 9 13 0 8 0 art_table 32 3063 0 2949 2 0 2 2 0 8 0 art_node 16 938 0 914 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 18 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 1034 0 1024 1 0 1 1 0 8 0 shmpl 112 144 0 29 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 10101 0 8680 89 0 89 89 0 8 0 ffsino 272 10101 0 8680 95 0 95 95 0 8 0 nchpl 144 19035 0 17427 61 1 60 61 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 66355 0 66355 2 1 1 1 0 8 1 percpumem 16 148 0 113 1 0 1 1 0 8 0 vcpupl 2048 33 0 0 5 0 5 5 0 8 0 vmpool 560 51 0 18 5 2 3 3 0 8 0 pfiaddrpl 120 32 0 23 1 0 1 1 0 8 0 scsiplug 72 11 0 11 4 4 0 1 0 8 0 scxspl 216 53850 0 53850 25 24 1 8 0 8 1 plimitpl 152 843 0 834 1 0 1 1 0 8 0 sigapl 424 6935 0 6882 7 0 7 7 0 8 1 futexpl 64 48465 0 48465 2 1 1 1 0 8 1 knotepl 112 134 0 0 3 0 3 3 0 8 0 kqueuepl 216 6711 0 6693 79 74 5 10 0 8 3 pipepl 336 1746 0 1736 68 66 2 11 0 8 1 fdescpl 496 6899 0 6881 3 0 3 3 0 8 0 filepl 152 53979 0 53870 102 95 7 14 0 8 2 lockfpl 104 2678 0 2676 7 6 1 4 0 8 0 lockfspl 48 489 0 487 1 0 1 1 0 8 0 sessionpl 144 49 0 38 1 0 1 1 0 8 0 pgrppl 48 126 0 115 1 0 1 1 0 8 0 ucredpl 96 5940 0 5928 1 0 1 1 0 8 0 zombiepl 144 6882 0 6881 2 1 1 1 0 8 0 processpl 1064 6935 0 6881 4 0 4 4 0 8 0 procpl 672 21023 0 20957 19 12 7 7 0 8 1 srpgc 96 28 0 28 6 6 0 1 0 8 0 sosppl 168 31 0 31 9 9 0 1 0 8 0 sockpl 480 14573 0 14546 315 303 12 29 0 8 8 mcl64k 65536 18 0 0 3 0 3 3 0 8 0 mcl16k 16384 22 0 0 3 1 2 3 0 8 0 mcl12k 12288 41 0 0 2 0 2 2 0 8 0 mcl9k 9216 30 0 0 2 0 2 2 0 8 0 mcl8k 8192 33 0 0 4 1 3 3 0 8 0 mcl4k 4096 37 0 0 4 2 2 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 366 0 0 28 0 28 28 0 8 0 mtagpl 96 368 0 0 5 0 5 5 0 8 0 mbufpl 256 1140 0 0 51 0 51 51 0 8 0 bufpl 288 14576 0 8247 453 0 453 453 0 8 0 anonpl 24 2049705 0 2031761 255 119 136 136 0 186 24 amapchunkpl 152 220712 0 220029 72 44 28 41 0 158 0 amappl16 200 20426 0 19824 138 98 40 45 0 8 8 amappl15 192 1582 0 1577 1 0 1 1 0 8 0 amappl14 184 669 0 666 1 0 1 1 0 8 0 amappl13 176 889 0 888 1 0 1 1 0 8 0 amappl12 168 1661 0 1657 2 1 1 1 0 8 0 amappl11 160 172 0 155 1 0 1 1 0 8 0 amappl10 152 719 0 716 1 0 1 1 0 8 0 amappl9 144 682 0 679 1 0 1 1 0 8 0 amappl8 136 2026 0 1956 3 0 3 3 0 8 0 amappl7 128 1214 0 1204 1 0 1 1 0 8 0 amappl6 120 612 0 600 1 0 1 1 0 8 0 amappl5 112 5941 0 5917 1 0 1 1 0 8 0 amappl4 104 1751 0 1718 1 0 1 1 0 8 0 amappl3 96 2997 0 2976 1 0 1 1 0 8 0 amappl2 88 8944 0 8895 6 4 2 2 0 8 0 amappl1 80 123981 0 123535 13 3 10 13 0 8 0 amappl 88 87485 0 87275 7 1 6 6 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 72 146 0 29 4 1 3 3 0 8 0 uaddrrnd 24 6950 0 6899 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6950 0 6899 1 0 1 1 0 8 0 vmmpekpl 168 56014 0 55982 2 0 2 2 0 8 0 vmmpepl 168 648784 0 646814 316 216 100 117 0 357 8 vmsppl 368 6949 0 6899 5 0 5 5 0 8 0 rwobjpl 56 167546 0 160041 128 18 110 110 0 8 3 pdppl 4096 13908 0 13831 103 24 79 81 0 8 2 pvpl 32 3383349 0 3361921 396 183 213 217 0 265 36 pmappl 248 6949 0 6899 4 0 4 4 0 8 0 extentpl 40 57 0 38 1 0 1 1 0 8 0 phpool 112 1038 0 199 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff8277fff0) 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(ffffffff829f1e48) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd8064d0a470,3c3f31a7000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024758210,3c3f31a76a8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024758210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff8277fff0) 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(ffffffff829f1e48) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829f1e48) at __mp_lock+0x122 sys/kern/kern_lock.c:147 uvm_fault(fffffd8064d0a470,3c3f31a7000,0,2) at uvm_fault+0x233 sys/uvm/uvm_fault.c:639 upageflttrap(ffff800024758210,3c3f31a76a8) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 usertrap(ffff800024758210) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403 recall_trap() at recall_trap+0x8 end trace frame: 0x0, count: -11 ddb{0}> machine ddbcpu 1 Stopped at uvm_fault_lower+0xbb1: movq 0(%rbx),%rdi uvm_fault_lower(ffff8000246dfd10,ffff8000246dfd48,ffff8000246dfc90,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd8064d0a470,20001000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246dfea0,200013c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246dfea0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_pwritev(ffff800021262d30,ffff8000246e0118,ffff8000246e0170) at sys_pwritev+0x5a sys/kern/vfs_syscalls.c:3343 syscall(ffff8000246e01e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246e01e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c3c1744c20, count: 6 ddb{1}> trace uvm_fault_lower(ffff8000246dfd10,ffff8000246dfd48,ffff8000246dfc90,0) at uvm_fault_lower+0xbb1 sys/uvm/uvm_fault.c:1325 uvm_fault(fffffd8064d0a470,20001000,0,1) at uvm_fault+0x24f sys/uvm/uvm_fault.c:640 kpageflttrap(ffff8000246dfea0,200013c0) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff8000246dfea0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_pwritev(ffff800021262d30,ffff8000246e0118,ffff8000246e0170) at sys_pwritev+0x5a sys/kern/vfs_syscalls.c:3343 syscall(ffff8000246e01e0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000246e01e0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3c3c1744c20, count: -9