*cpu1: uvm_fault(0xffffffff835c9480, 0xffff80002a0c5000, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x76c4bee3f20, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a08e810 rbx 0 rdx 0 rcx 0xffff8000ffff2020 rax 0x32 r8 0xffff80002a08e740 r9 0x8080808080808080 r10 0xde0a65e555f81f2e r11 0x808e1fb6f11ab8b6 r12 0 r13 0 r14 0xffff8000ffff2020 r15 0 rip 0xffffffff828bc3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a08e790 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{0}> show proc PROC (syz-executor) tid=123682 pid=5018 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffff2530,0xffff8000ffff27c8 process=0xffff8000ffff71f0 user=0xffff80002a089000, vmspace=0xfffffd806bec0dc0 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 66221 210534 95989 0 2 0 syz-executor 66221 465808 95989 0 7 0x4000000 syz-executor 5018 129387 16098 60928 3 0x90 nanoslp syz-executor * 5018 123682 16098 60928 7 0x4000010 syz-executor 5018 97877 16098 60928 3 0x4000090 fsleep syz-executor 5018 179137 16098 60928 3 0x4000090 fsleep syz-executor 73156 23116 32603 0 3 0x80 nanoslp syz-executor 73156 312802 32603 0 3 0x4000080 kqpoll syz-executor 73156 477398 32603 0 3 0x4000080 fsleep syz-executor 15009 489531 69698 60928 3 0x90 nanoslp syz-executor 15009 87820 69698 60928 3 0x4000090 fsleep syz-executor 15009 443318 69698 60928 3 0x4000090 sbwait syz-executor 15009 253570 69698 60928 3 0x4000090 fsleep syz-executor 72224 145846 29073 0 3 0x80 nanoslp syz-executor 72224 362396 29073 0 3 0x4000080 ttyin syz-executor 72224 104553 29073 0 3 0x4000080 fsleep syz-executor 32103 277875 1 0 3 0x100083 ttyin getty 29073 17640 68733 0 3 0x82 nanoslp syz-executor 32603 345221 68733 0 3 0x82 nanoslp syz-executor 13573 304678 68733 0 3 0x2 biowait syz-executor 16098 337288 68733 0 3 0x82 nanoslp syz-executor 11106 285470 68733 0 3 0x82 wait syz-executor 69698 485226 68733 0 3 0x82 nanoslp syz-executor 7296 181989 68733 0 3 0x82 wait syz-executor 95989 300263 68733 0 3 0x82 nanoslp syz-executor 54991 300840 0 0 3 0x14200 bored sosplice 68733 504194 14469 0 3 0x82 kqread syz-executor 14469 286089 76928 0 3 0x10008a sigsusp ksh 76928 142542 74178 0 3 0x98 kqread sshd-session 74178 259930 43347 0 3 0x92 kqread sshd-session 43347 340538 1 0 3 0x88 kqread sshd 90600 102367 33590 74 3 0x1100092 bpf pflogd 33590 16043 1 0 3 0x80 sbwait pflogd 63581 323796 55097 73 3 0x1100090 kqread syslogd 55097 348099 1 0 3 0x100082 sbwait syslogd 27172 516828 1 0 3 0x100080 kqread resolvd 84091 181911 45678 77 3 0x100092 kqread dhcpleased 99001 487541 45678 77 3 0x100092 kqread dhcpleased 45678 228752 1 0 3 0x80 kqread dhcpleased 34423 200177 0 0 3 0x14200 bored smr 77620 445393 0 0 2 0x14200 zerothread 86610 356213 0 0 3 0x14200 aiodoned aiodoned 34038 509950 0 0 3 0x14200 syncer update 83939 103571 0 0 3 0x14200 cleaner cleaner 56923 268296 0 0 3 0x14200 reaper reaper 74091 286143 0 0 3 0x14200 pgdaemon pagedaemon 81929 516119 0 0 3 0x14200 bored viomb 69999 145385 0 0 3 0x40014200 acpi0 acpi0 67121 351135 0 0 3 0x40014200 idle1 24742 427022 0 0 3 0x14200 bored softnet3 44495 55316 0 0 3 0x14200 bored softnet2 72337 93063 0 0 3 0x14200 bored softnet1 94599 326034 0 0 3 0x14200 bored softnet0 59032 335767 0 0 3 0x14200 bored systqmp 18311 439274 0 0 3 0x14200 bored systq 826 28536 0 0 3 0x14200 tmoslp softclockmp 65821 381147 0 0 3 0x40014200 tmoslp softclock 35921 167035 0 0 3 0x40014200 idle0 1 240351 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 66221 (syz-executor) thread 0xffff8000367b7200 (465808) Process 5018 (syz-executor) thread 0xffff8000ffff2020 (123682) Process 13573 (syz-executor) thread 0xffff8000ffffd960 (304678) ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10251 10201K 10705K 166960K 22743 0 pcb 18 20K 22K 166960K 2041 0 rtable 283 24K 25K 166960K 10281 0 pf 61 23K 87K 166960K 1058 0 ifaddr 48 11K 12K 166960K 1377 0 ifgroup 80 3K 3K 166960K 1541 0 sysctl 4 1K 5K 166960K 17 0 counters 76 37K 38K 166960K 852 0 ioctlops 0 0K 8K 166960K 2899 0 iov 0 0K 24K 166960K 723 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1591 100K 100K 166960K 12831 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 36K 40K 166960K 101 0 VM map 2 1K 1K 166960K 2 0 sem 17 28K 28K 166960K 269 0 dirhash 15 2K 3K 166960K 168 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 93K 166960K 11405 0 sigio 0 0K 0K 166960K 171 0 proc 74 91K 152K 166960K 9584 0 subproc 104 6K 7K 166960K 3995 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 1565 0 in_multi 98 7K 7K 166960K 3684 0 ether_multi 1 0K 0K 166960K 97 0 mrt 1 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 295 1314K 1314K 166960K 295 0 exec 0 0K 1K 166960K 5661 0 pfkey data 0 0K 0K 166960K 10 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 300 249K 259K 166960K 91988 0 UVM aobj 8 2K 2K 166960K 10 0 pinsyscall 42 84K 108K 166960K 20288 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 475 0 NDP 18 0K 2K 166960K 1023 0 temp 88 6824K 7455K 166960K 1890204 0 kqueue 13 20K 31K 166960K 1114 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 1674 0 1670 11 10 1 3 0 8 0 rtentry 112 3653 0 3546 7 3 4 4 0 8 0 unpcb 144 7811 0 7792 83 77 6 6 0 8 4 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 808 3818 0 3782 122 114 8 8 0 8 4 arp 120 656 0 638 1 0 1 1 0 8 0 inpcb 336 13871 0 13810 188 179 9 16 0 8 3 nd6 136 967 0 939 1 0 1 1 0 8 0 pkpcb 40 35 0 35 15 14 1 1 0 8 1 kcovpl 48 307 0 299 1 0 1 1 0 8 0 ppxss 1168 56 0 56 29 28 1 1 0 8 1 pfstscr 40 44 0 44 6 6 0 1 0 8 0 pffrag 232 90 0 85 3 2 1 1 0 482 0 pffrnode 88 88 0 83 3 2 1 1 0 8 0 pffrent 40 496 0 491 3 2 1 1 0 8 0 pfosfp 40 1431 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1431 0 714 21 0 21 21 0 8 0 pfrktable 1344 43 0 28 6 4 2 2 0 8 0 pfanchor 1288 12 0 4 1 0 1 1 0 8 0 pftag 88 21 0 11 1 0 1 1 0 8 0 pfqueue 264 2 0 0 1 0 1 1 0 8 0 pfstitem 24 978 0 876 1 0 1 1 0 8 0 pfstkey 128 1073 0 965 4 0 4 4 0 8 0 pfstate 376 1019 0 921 13 3 10 10 0 8 0 pfrule 1344 227 0 156 7 1 6 6 0 8 0 art_heap8 4096 5 0 2 5 2 3 5 0 8 0 art_heap4 256 14395 0 13940 58 29 29 31 0 8 0 art_table 32 14400 0 13942 4 0 4 4 0 8 0 art_node 16 3574 0 3479 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 264 0 249 1 0 1 1 0 8 0 shmpl 112 7 0 2 1 0 1 1 0 8 0 dirhash 1024 125 0 104 4 1 3 4 0 8 0 dino2pl 256 15684 0 13576 133 0 133 133 0 8 0 ffsino 272 15684 0 13576 144 2 142 142 0 8 0 nchpl 144 26396 0 25415 75 38 37 67 0 8 0 uvmvnodes 80 9211 0 0 188 0 188 188 0 8 0 vnodes 216 9211 0 0 512 0 512 512 0 8 0 namei 1024 128816 0 128815 30 29 1 2 0 8 0 percpumem 16 440 0 388 1 0 1 1 0 8 0 vcpupl 3904 35 0 4 4 0 4 4 0 8 0 vmpool 696 56 0 25 4 1 3 3 0 8 0 pfiaddrpl 120 13 0 4 3 2 1 1 0 8 0 kstatmem 264 812 0 776 4 1 3 3 0 8 0 scsiplug 72 21 0 21 13 13 0 1 0 8 0 scxspl 216 230814 0 230813 32 31 1 8 1 8 0 plimitpl 152 2110 0 2092 1 0 1 1 0 8 0 sigapl 424 11146 0 11096 10 3 7 9 0 8 0 futexpl 64 118763 0 118757 26 25 1 1 0 8 0 knotepl 120 1250 0 0 25 3 22 23 0 8 0 kqueuepl 216 2952 0 2877 51 46 5 5 0 8 0 pipepl 320 2121 0 2094 23 20 3 8 0 8 0 fdescpl 496 11097 0 11066 17 12 5 5 0 8 0 filepl 152 78268 0 77910 177 161 16 20 0 8 2 lockfpl 104 3144 0 3141 4 3 1 2 0 8 0 lockfspl 48 1292 0 1289 1 0 1 1 0 8 0 sessionpl 144 331 0 322 1 0 1 1 0 8 0 pgrppl 48 909 0 892 1 0 1 1 0 8 0 ucredpl 104 13396 0 13380 1 0 1 1 0 8 0 zombiepl 144 11098 0 11096 4 3 1 1 0 8 0 processpl 1160 11146 0 11096 8 4 4 6 0 8 0 procpl 648 23254 0 23193 17 11 6 9 0 8 0 srpgc 96 45 0 45 16 16 0 1 0 8 0 sosppl 168 59 0 59 24 23 1 1 0 8 1 sockpl 664 23535 0 23453 249 234 15 23 0 8 8 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 462 0 0 28 5 23 28 0 8 0 mtagpl 96 82 0 0 2 0 2 2 0 8 0 mbufpl 256 1992 0 0 97 0 97 97 0 8 0 bufpl 280 33603 0 25283 664 61 603 659 0 8 0 anonpl 24 1358143 0 1353479 134 76 58 83 0 185 0 amapchunkpl 152 294219 0 293617 132 106 26 36 0 158 1 amappl16 200 22652 0 22610 199 187 12 19 0 8 0 amappl15 192 15 0 15 3 3 0 1 0 8 0 amappl14 184 735 0 723 1 0 1 1 0 8 0 amappl13 176 13 0 13 2 2 0 1 0 8 0 amappl12 168 16508 0 16477 3 1 2 2 0 8 0 amappl11 160 59 0 45 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 150 0 150 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 711 0 698 1 0 1 1 0 8 0 amappl6 120 3159 0 3157 1 0 1 1 0 8 0 amappl5 112 1340 0 1328 1 0 1 1 0 8 0 amappl4 104 1237 0 1217 1 0 1 1 0 8 0 amappl3 96 58804 0 58677 4 0 4 4 0 8 0 amappl2 88 4882 0 4815 2 0 2 2 0 8 0 amappl1 80 59960 0 59370 18 4 14 15 0 8 0 amappl 88 88880 0 88672 7 1 6 6 0 92 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 71 0 70 1 0 1 1 0 8 0 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 16 0 16 10 10 0 1 0 8 0 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 9 0 2 1 0 1 1 0 8 0 uaddrrnd 24 11153 0 11091 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11153 0 11091 1 0 1 1 0 8 0 vmmpekpl 168 87996 0 87926 4 0 4 4 0 8 0 vmmpepl 168 666417 0 664442 263 170 93 100 0 357 0 vmsppl 440 11152 0 11091 11 3 8 8 0 8 0 rwobjpl 56 178727 0 168495 169 23 146 148 0 8 0 pdppl 4096 22313 0 22213 536 434 102 107 0 8 2 pvpl 32 34775 0 0 278 3 275 275 0 265 0 pmappl 248 11152 0 11091 5 1 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1397 0 840 16 0 16 16 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x76c4bee3f20, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x77 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x77 sys/dev/acpi/acpitimer.c:120 comcnputc(800,2c) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(2c) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(2c) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8308e045) at db_printf+0x9b fault(ffffffff8303e84b) at fault+0xa7 sys/arch/amd64/amd64/trap.c:157 kpageflttrap(ffff80002a0c41f0,ffff80002a0c5000) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:290 kerntrap(ffff80002a0c41f0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b end trace frame: 0xffff80002a0c4340, count: 0 ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666 acpitimer_delay(1) at acpitimer_delay+0x77 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline] acpitimer_delay(1) at acpitimer_delay+0x77 sys/dev/acpi/acpitimer.c:120 comcnputc(800,2c) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(2c) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(2c) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8308e045) at db_printf+0x9b fault(ffffffff8303e84b) at fault+0xa7 sys/arch/amd64/amd64/trap.c:157 kpageflttrap(ffff80002a0c41f0,ffff80002a0c5000) at kpageflttrap+0x385 sys/arch/amd64/amd64/trap.c:290 kerntrap(ffff80002a0c41f0) at kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b memcpy() at memcpy+0x19 ttwrite(ffff800000a5d800,ffff80002a0c48c0,11) at ttwrite+0x7d7 sys/kern/tty.c:1856 spec_write(ffff80002a0c46a0) at spec_write+0x120 sys/kern/spec_vnops.c:302 VOP_WRITE(fffffd8073bcfca8,ffff80002a0c48c0,11,fffffd807f7d33a8) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd805fc88688,ffff80002a0c48c0,0) at vn_write+0x1d1 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000367b7200,6,ffff80002a0c48c0,0,ffff80002a0c4980) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff8000367b7200,ffff80002a0c4a30,ffff80002a0c4980) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff80002a0c4a30) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:179 [inline] syscall(ffff80002a0c4a30) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd9d10dbef40, count: -23