*cpu0: uvm_fault(0xfffffd8071db3200, 0x7ba880, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x755df62fbe60, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a39b720 rbx 0 rdx 0 rcx 0xffff8000ffff2fa0 rax 0x3b r8 0xffff80002a39b650 r9 0x1 r10 0x9073386dc03f343c r11 0xa373047eb23c3a2d r12 0 r13 0 r14 0xffff8000ffff2fa0 r15 0 rip 0xffffffff8163a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a39b6a0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=175244 pid=13432 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b9ca0,0xffff800036409cb8 process=0xffff80002a2c30d8 user=0xffff80002a396000, vmspace=0xfffffd800b0271e8 estcpu=36, cpticks=395, pctcpu=0.40, user=8, sys=376, intr=10 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 3808 263361 37472 0 2 0xc80 syz-executor 3808 381889 37472 0 3 0x4000000 smrbar syz-executor 73443 110000 13432 0 2 0x82000 syz-executor 73443 116710 13432 0 4 0x4082000 syz-executor 73443 160360 13432 0 3 0x4002000 suspend syz-executor 63263 355312 27571 0 2 0 syz-executor 63263 287092 27571 0 3 0x4000080 fsleep syz-executor 97808 458705 62392 0 2 0xc80 syz-executor 97808 178084 62392 0 2 0x4000000 syz-executor 97808 174541 62392 0 3 0x4000080 fsleep syz-executor 97808 152663 62392 0 3 0x4000080 fsleep syz-executor 19309 326149 57111 0 3 0x3000 suspend syz-executor 19309 479211 57111 0 7 0x4081000 syz-executor 82656 169399 48710 0 4 0x82000 syz-executor 82656 311523 48710 0 2 0x4082000 syz-executor 82656 294805 48710 0 4 0x4082000 syz-executor 82656 48338 48710 0 3 0x4082000 inode syz-executor 82656 364863 48710 0 3 0x4002000 suspend syz-executor 18910 273155 62198 0 3 0x3000 suspend syz-executor 18910 89873 62198 0 2 0x4081000 syz-executor 18910 439792 62198 0 3 0x4081000 inode syz-executor 18910 56617 62198 0 3 0x4081000 inode syz-executor 44763 414391 1 0 3 0x100083 ttyin getty 62392 11558 39354 0 2 0xc82 syz-executor 48710 36442 39354 0 3 0x82 wait syz-executor 37472 516079 39354 0 2 0xc82 syz-executor 85771 331713 39354 0 2 0xc82 syz-executor 57111 30047 39354 0 2 0xc82 syz-executor 27571 491070 39354 0 2 0xc82 syz-executor 4863 51305 0 0 3 0x14200 bored sosplice *13432 175244 39354 0 7 0x2 syz-executor 62198 271979 39354 0 3 0x82 wait syz-executor 39354 310145 93713 0 3 0x82 kqread syz-executor 93713 9701 76974 0 3 0x10008a sigsusp ksh 76974 491715 24554 0 3 0x98 kqread sshd-session 24554 492145 77135 0 3 0x92 kqread sshd-session 77135 462556 1 0 3 0x88 kqread sshd 32700 163423 53073 74 3 0x1100092 bpf pflogd 53073 268854 1 0 3 0x80 sbwait pflogd 83737 3225 6507 73 3 0x1100090 kqread syslogd 6507 106935 1 0 3 0x100082 sbwait syslogd 35493 69050 1 0 3 0x100080 kqread resolvd 20177 391362 81746 77 3 0x100092 kqread dhcpleased 44200 29744 81746 77 3 0x100092 kqread dhcpleased 81746 362519 1 0 3 0x80 kqread dhcpleased 15671 291133 0 0 3 0x14200 bored smr 19811 235668 0 0 3 0x14200 pgzero zerothread 62642 274104 0 0 3 0x14200 aiodoned aiodoned 7287 248401 0 0 3 0x14200 syncer update 68318 308452 0 0 3 0x14200 cleaner cleaner 67286 300987 0 0 2 0x14200 reaper 87580 201028 0 0 3 0x14200 pgdaemon pagedaemon 35881 357507 0 0 3 0x14200 bored viomb 3589 494797 0 0 3 0x40014200 acpi0 acpi0 23836 361202 0 0 3 0x40014200 idle1 51995 18647 0 0 3 0x14200 bored softnet7 42887 58461 0 0 3 0x14200 bored softnet6 96765 284326 0 0 3 0x14200 bored softnet5 83893 97242 0 0 3 0x14200 bored softnet4 90939 501419 0 0 3 0x14200 bored softnet3 38312 162656 0 0 3 0x14200 bored softnet2 68305 411122 0 0 3 0x14200 bored softnet1 1170 111530 0 0 3 0x14200 bored softnet0 80845 451284 0 0 3 0x14200 bored systqmp 51780 252660 0 0 3 0x14200 bored systq 25340 58371 0 0 3 0x14200 tmoslp softclockmp 63399 468645 0 0 2 0x40014200 softclock 3900 519118 0 0 3 0x40014200 idle0 1 445352 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 3808 (syz-executor) thread 0xffff8000ffff2d08 (381889) Process 97808 (syz-executor) thread 0xffff80003c439a30 (178084) Process 82656 (syz-executor) thread 0xffff80003c438570 (311523) Process 82656 (syz-executor) thread 0xffff80003c438808 (48338) Process 18910 (syz-executor) thread 0xffff80003b017a18 (89873) Process 18910 (syz-executor) thread 0xffff800036408020 (439792) Process 67286 (reaper) thread 0xffff8000ffffca68 (300987) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10251 11068K 12401K 166960K 16511 0 pcb 18 20K 23K 166960K 1107 0 rtable 225 14K 15K 166960K 1098 0 pf 39 18K 20K 166960K 394 0 ifaddr 39 8K 9K 166960K 261 0 ifgroup 60 2K 2K 166960K 494 0 sysctl 4 1K 9K 166960K 34 0 counters 70 37K 38K 166960K 568 0 ioctlops 0 0K 4K 166960K 2488 0 iov 0 0K 32K 166960K 351 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1549 97K 98K 166960K 4904 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 24 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 341 0 dirhash 12 2K 2K 166960K 123 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 4250 0 sigio 0 0K 0K 166960K 199 0 proc 77 131K 180K 166960K 1248 0 subproc 73 4K 6K 166960K 343 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 900 0 in_multi 85 6K 7K 166960K 304 0 ether_multi 1 0K 0K 166960K 21 0 mrt 2 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 247 1102K 1102K 166960K 247 0 exec 0 0K 1K 166960K 1156 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 3 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 271 161K 178K 166960K 40263 0 UVM aobj 67 3K 4K 166960K 71 0 pinsyscall 43 86K 102K 166960K 5589 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 230 0 NDP 13 0K 2K 166960K 204 0 temp 84 8648K 8777K 166960K 234369 0 kqueue 14 20K 36K 166960K 840 0 SYN cache 2 0K 16K 166960K 4 0 ddb{1}> 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 120 359 0 354 1 0 1 1 0 8 0 rtentry 176 326 0 247 5 0 5 5 0 8 0 unpcb 144 3884 0 3867 30 26 4 8 0 8 3 syncache 336 27 0 27 10 10 0 1 0 8 0 tcpqe 32 6 0 6 4 4 0 1 0 8 0 tcpcb 736 1351 0 1345 26 24 2 7 0 8 1 arp 128 28 0 19 1 0 1 1 0 8 0 inpcb 328 5116 0 5105 55 49 6 12 0 8 4 nd6 144 45 0 29 1 0 1 1 0 8 0 pkpcb 40 35 0 35 8 7 1 1 0 8 1 kcovpl 48 16 0 8 1 0 1 1 0 8 0 mppekey 1024 5 0 5 3 2 1 1 0 8 1 ppxss 1192 202 0 202 10 9 1 1 0 8 1 pppxif 1504 16 0 16 7 7 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 52 0 46 1 0 1 1 0 482 0 pffrnode 88 51 0 45 1 0 1 1 0 8 0 pffrent 40 95 0 89 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 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pfstitem 24 215 0 135 1 0 1 1 0 8 0 pfstkey 128 217 0 137 3 0 3 3 0 8 0 pfstate 384 216 0 136 9 0 9 9 0 8 0 pfrule 1344 22 0 16 2 1 1 2 0 8 0 rttmr 136 7 0 7 7 7 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1236 0 848 43 14 29 29 0 8 2 art_table 40 1240 0 848 6 1 5 5 0 8 0 art_node 32 324 0 257 2 1 1 2 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 335 0 325 1 0 1 1 0 8 0 shmpl 112 68 0 4 2 0 2 2 0 8 0 dirhash 1024 92 0 75 3 0 3 3 0 8 0 dino2pl 256 9447 0 7929 96 0 96 96 0 8 0 ffsino 296 9447 0 7929 118 0 118 118 0 8 0 nchpl 144 15224 0 13501 64 0 64 64 0 8 0 rtmask 32 44 0 44 11 11 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 55915 0 55912 7 5 2 2 0 8 1 percpumem 16 299 0 249 1 0 1 1 0 8 0 kstatmem 264 344 0 314 6 3 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 18 0 18 11 10 1 1 0 8 1 scxspl 216 112368 0 112368 22 19 3 8 1 8 3 plimitpl 152 910 0 889 1 0 1 1 0 8 0 sigapl 424 4515 0 4460 9 2 7 9 0 8 0 knotepl 120 882 0 0 24 0 24 24 0 8 0 kqueuepl 224 1811 0 1800 19 14 5 5 0 8 4 pipepl 344 863 0 835 30 27 3 9 0 8 0 fdescpl 528 4459 0 4427 3 0 3 3 0 8 0 filepl 160 32882 0 32585 66 53 13 20 0 8 0 lockfpl 104 2125 0 2120 3 2 1 2 0 8 0 lockfspl 48 685 0 681 1 0 1 1 0 8 0 sessionpl 144 54 0 45 1 0 1 1 0 8 0 pgrppl 48 156 0 139 1 0 1 1 0 8 0 ucredpl 104 4779 0 4766 1 0 1 1 0 8 0 zombiepl 144 6403 0 6400 1 0 1 1 0 8 0 processpl 1248 4515 0 4460 6 0 6 6 0 8 0 procpl 664 11803 0 11732 11 4 7 9 0 8 0 sosppl 168 22 0 22 10 9 1 1 0 8 1 sockpl 752 9605 0 9572 121 110 11 23 0 8 7 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 100 0 0 10 2 8 10 0 8 0 mtagpl 96 44 0 0 2 0 2 2 0 8 0 mbufpl 256 1197 0 0 70 0 70 70 0 8 0 bufpl 280 49772 0 43626 440 0 440 440 0 8 0 anonpl 32 16230 0 0 131 1 130 130 0 246 0 amapchunkpl 152 139752 0 139096 92 64 28 35 0 158 0 amappl16 200 16470 0 15939 184 156 28 41 0 8 0 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 179 0 167 1 0 1 1 0 8 0 amappl13 176 7 0 6 1 0 1 1 0 8 0 amappl12 168 5262 0 5230 3 1 2 2 0 8 0 amappl11 160 82 0 67 1 0 1 1 0 8 0 amappl10 152 28 0 27 1 0 1 1 0 8 0 amappl9 144 244 0 243 2 1 1 1 0 8 0 amappl8 136 42 0 39 1 0 1 1 0 8 0 amappl7 128 147 0 134 1 0 1 1 0 8 0 amappl6 120 288 0 283 1 0 1 1 0 8 0 amappl5 112 177 0 167 1 0 1 1 0 8 0 amappl4 104 404 0 383 1 0 1 1 0 8 0 amappl3 96 29206 0 29075 4 0 4 4 0 8 0 amappl2 88 991 0 924 2 0 2 2 0 8 0 amappl1 80 30126 0 29522 15 0 15 15 0 8 0 amappl 88 38592 0 38395 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 2 0 2 2 2 0 1 0 8 0 dma4096 4096 3 0 3 3 3 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 259 0 259 6 5 1 1 0 8 1 dma64 64 9 0 9 4 3 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 70 0 4 2 0 2 2 0 8 0 uaddrrnd 24 4459 0 4427 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4459 0 4427 1 0 1 1 0 8 0 vmmpekpl 168 38517 0 38461 3 0 3 3 0 8 0 vmmpepl 168 290911 0 288280 168 53 115 124 0 357 0 vmsppl 488 4458 0 4427 6 1 5 5 0 8 0 rwobjpl 80 82491 0 75006 168 15 153 158 0 8 0 pdppl 4096 8926 0 8854 164 92 72 84 0 8 0 pvpl 32 24870 0 0 199 0 199 199 0 265 0 pmappl 256 4458 0 4427 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 468 0 158 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8376fff0) 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 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+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 kputchar(65,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83333a8c) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80002a3155c0,6) at trap_print+0xd8 sys/arch/amd64/amd64/trap.c:633 kerntrap(ffff80002a3155c0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 end trace frame: 0xffff80002a3159f0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8376fff0) 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 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+0x57 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x57 sys/dev/acpi/acpitimer.c:120 comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 kputchar(65,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83333a8c) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80002a3155c0,6) at trap_print+0xd8 sys/arch/amd64/amd64/trap.c:633 kerntrap(ffff80002a3155c0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80002a315a00) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a315a00) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc24d07c6140, count: -16 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x755df62fbe60, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x755df62fbe60, count: -1