*cpu0: uvm_fault(0xfffffd800b0265a0, 0x720, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7adfc368b340, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2f8760 rbx 0 rdx 0 rcx 0xffff80003c41b9c8 rax 0x3c r8 0xffff80002a2f8690 r9 0x1 r10 0x143a16e04b706b2b r11 0x51f901c489f437a5 r12 0 r13 0 r14 0xffff80003c41b9c8 r15 0 rip 0xffffffff821523ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2f86e0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=31311 pid=16059 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=0xffff800039bfe020,0xffff8000343e4a88 process=0xffff80003c41d388 user=0xffff80002a2f3000, vmspace=0xfffffd806c252978 estcpu=36, cpticks=7, pctcpu=0.15, user=1, sys=45, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50746 467256 2593 0 2 0 syz-executor 69962 459659 16059 60928 2 0x10 syz-executor 69962 320061 16059 60928 2 0x4000c90 syz-executor 58632 134898 80763 0 2 0 syz-executor 58632 96488 80763 0 7 0x4000000 syz-executor 60585 95398 89520 0 2 0 syz-executor 60585 47466 89520 0 3 0x4000080 fsleep syz-executor 13077 332875 41497 0 2 0 syz-executor 13077 329452 41497 0 3 0x4000080 fsleep syz-executor 13077 456795 41497 0 3 0x4000080 fsleep syz-executor 26179 393013 32574 0 2 0 syz-executor 26179 436582 32574 0 3 0x4000080 fsleep syz-executor 26179 333891 32574 0 3 0x4000080 fsleep syz-executor 89520 348750 6698 0 2 0xc82 syz-executor 83097 211148 6698 0 3 0x82 wait syz-executor 32574 399988 6698 0 2 0xc82 syz-executor 59525 138376 1 0 3 0x100083 ttyin getty *16059 31311 6698 0 7 0x2 syz-executor 2593 140586 6698 0 2 0xc82 syz-executor 99411 75315 0 0 3 0x14200 bored sosplice 80763 301061 6698 0 2 0x2 syz-executor 41497 221712 6698 0 2 0xc82 syz-executor 95869 455213 6698 0 2 0x2 syz-executor 6698 38137 37792 0 3 0x82 kqread syz-executor 37792 29435 13971 0 3 0x10008a sigsusp ksh 13971 480483 61490 0 3 0x98 kqread sshd-session 61490 124193 6390 0 3 0x92 kqread sshd-session 6390 90344 1 0 3 0x88 kqread sshd 34152 249456 39434 74 3 0x1100092 bpf pflogd 39434 331604 1 0 3 0x80 sbwait pflogd 87415 329462 8928 73 3 0x1100090 kqread syslogd 8928 186453 1 0 3 0x100082 sbwait syslogd 33019 242478 1 0 3 0x100080 kqread resolvd 87507 7745 72226 77 3 0x100092 kqread dhcpleased 85969 483829 72226 77 3 0x100092 kqread dhcpleased 72226 363406 1 0 3 0x80 kqread dhcpleased 56831 279412 0 0 3 0x14200 bored smr 93014 111316 0 0 2 0x14200 zerothread 15107 523301 0 0 3 0x14200 aiodoned aiodoned 48737 477753 0 0 3 0x14200 syncer update 69389 6030 0 0 3 0x14200 cleaner cleaner 20120 493697 0 0 3 0x14200 reaper reaper 8132 162869 0 0 3 0x14200 pgdaemon pagedaemon 59760 109476 0 0 3 0x14200 bored viomb 4568 139887 0 0 3 0x40014200 acpi0 acpi0 30968 291143 0 0 3 0x40014200 idle1 20535 232082 0 0 3 0x14200 bored softnet3 54838 147178 0 0 3 0x14200 bored softnet2 93788 405522 0 0 3 0x14200 bored softnet1 6682 421907 0 0 2 0x14200 softnet0 24360 408365 0 0 3 0x14200 bored systqmp 8073 18864 0 0 3 0x14200 bored systq 8068 313938 0 0 3 0x14200 tmoslp softclockmp 7684 48508 0 0 2 0x40014200 softclock 68146 165588 0 0 3 0x40014200 idle0 1 397363 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff839357f0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:301 #2 mtx_enter+0x62 sys/kern/kern_lock.c:258 #3 preempt+0x35 sys/kern/sched_bsd.c:339 #4 ast+0x165 mi_ast sys/sys/syscall_mi.h:252 [inline] #4 ast+0x165 sys/arch/amd64/amd64/trap.c:543 #5 Xsyscall+0x156 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10217 11076K 11214K 166960K 13052 0 pcb 17 12K 12K 166960K 143 0 rtable 198 9K 11K 166960K 667 0 pf 34 17K 22K 166960K 132 0 ifaddr 34 6K 8K 166960K 106 0 ifgroup 47 2K 2K 166960K 152 0 sysctl 4 1K 9K 166960K 12 0 counters 64 36K 37K 166960K 300 0 ioctlops 0 0K 4K 166960K 1696 0 iov 0 0K 16K 166960K 46 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1404 88K 88K 166960K 2498 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 41 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 110K 166960K 1093 0 sigio 0 0K 0K 166960K 23 0 proc 72 91K 140K 166960K 840 0 subproc 72 4K 4K 166960K 136 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 111 0 in_multi 74 5K 7K 166960K 205 0 ether_multi 1 0K 0K 166960K 5 0 mrt 1 0K 0K 166960K 9 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 731 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 231 160K 177K 166960K 11455 0 UVM aobj 26 2K 2K 166960K 27 0 pinsyscall 42 84K 104K 166960K 2424 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 53 0 NDP 10 0K 1K 166960K 71 0 temp 65 8693K 8757K 166960K 33845 0 kqueue 17 24K 32K 166960K 172 0 SYN cache 2 16K 16K 166960K 2 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 120 189 0 186 4 3 1 3 0 8 0 rtentry 176 211 0 129 6 1 5 6 0 8 0 unpcb 144 741 0 720 6 4 2 4 0 8 0 syncache 336 14 0 14 2 1 1 1 0 8 1 tcpqe 32 2 0 2 2 1 1 1 0 8 1 tcpcb 736 665 0 659 12 5 7 7 0 8 5 arp 128 35 0 19 1 0 1 1 0 8 0 inpcb 328 1188 0 1179 10 3 7 7 0 8 4 nd6 144 47 0 27 1 0 1 1 0 8 0 pkpcb 40 10 0 10 1 0 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 100 0 100 2 1 1 1 0 8 1 pppxif 1504 71 0 71 2 2 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 8 0 2 1 0 1 1 0 482 0 pffrnode 88 8 0 2 1 0 1 1 0 8 0 pffrent 40 14 0 7 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 1 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 1 1 0 1 1 0 8 0 pfstitem 24 57 0 22 1 0 1 1 0 8 0 pfstkey 128 62 0 25 2 0 2 2 0 8 0 pfstate 384 57 0 23 4 0 4 4 0 8 0 pfrule 1344 28 0 18 2 0 2 2 0 8 0 rttmr 136 4 0 4 1 0 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 953 0 603 31 3 28 31 0 8 2 art_table 32 956 0 603 4 0 4 4 0 8 0 art_node 16 206 0 132 1 0 1 1 0 8 0 sysvmsgpl 40 80 0 74 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 24 0 1 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 3179 0 1659 96 0 96 96 0 8 0 ffsino 288 3179 0 1659 110 0 110 110 0 8 0 nchpl 144 4646 0 2929 64 0 64 64 0 8 0 rtmask 32 8 0 8 3 2 1 1 0 8 1 uvmvnodes 80 4058 0 0 83 0 83 83 0 8 0 vnodes 216 4058 0 0 226 0 226 226 0 8 0 namei 1024 17125 0 17125 1 0 1 1 0 8 1 percpumem 16 165 0 118 1 0 1 1 0 8 0 kstatmem 264 84 0 62 3 1 2 3 0 8 0 scsiplug 72 5 0 5 2 2 0 1 0 8 0 scxspl 216 16938 0 16938 12 10 2 8 1 8 2 plimitpl 152 162 0 144 1 0 1 1 0 8 0 sigapl 424 1410 0 1360 9 2 7 9 0 8 0 knotepl 120 501 0 0 16 0 16 16 0 8 0 kqueuepl 224 423 0 410 8 7 1 5 0 8 0 pipepl 336 194 0 166 3 0 3 3 0 8 0 fdescpl 520 1370 0 1339 3 0 3 3 0 8 0 filepl 160 8451 0 8220 21 5 16 17 0 8 3 lockfpl 104 302 0 299 1 0 1 1 0 8 0 lockfspl 48 126 0 123 1 0 1 1 0 8 0 sessionpl 144 41 0 32 1 0 1 1 0 8 0 pgrppl 48 73 0 56 1 0 1 1 0 8 0 ucredpl 104 1152 0 1137 1 0 1 1 0 8 0 zombiepl 144 1361 0 1360 1 0 1 1 0 8 0 processpl 1240 1410 0 1360 7 2 5 6 0 8 0 procpl 656 2911 0 2854 8 1 7 8 0 8 0 srpgc 96 22 0 22 3 2 1 1 0 8 1 sosppl 168 6 0 6 2 2 0 1 0 8 0 sockpl 728 2157 0 2124 13 3 10 10 0 8 5 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 124 0 0 16 0 16 16 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 28 0 0 1 0 1 1 0 8 0 mbufpl 256 728 0 0 45 0 45 45 0 8 0 bufpl 280 5478 0 126 383 0 383 383 0 8 0 anonpl 32 8320 0 0 68 0 68 68 0 246 0 amapchunkpl 152 36664 0 36078 34 6 28 30 0 158 3 amappl16 200 2961 0 2926 22 16 6 15 0 8 2 amappl15 192 3 0 3 2 2 0 1 0 8 0 amappl14 184 148 0 136 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 2143 0 2112 2 0 2 2 0 8 0 amappl11 160 49 0 35 1 0 1 1 0 8 0 amappl10 152 23 0 23 1 1 0 1 0 8 0 amappl9 144 270 0 270 1 1 0 1 0 8 0 amappl8 136 18 0 16 1 0 1 1 0 8 0 amappl7 128 161 0 148 1 0 1 1 0 8 0 amappl6 120 264 0 261 1 0 1 1 0 8 0 amappl5 112 154 0 145 1 0 1 1 0 8 0 amappl4 104 382 0 361 1 0 1 1 0 8 0 amappl3 96 7274 0 7168 4 0 4 4 0 8 0 amappl2 88 818 0 755 2 0 2 2 0 8 0 amappl1 80 15118 0 14522 17 1 16 16 0 8 0 amappl 88 10439 0 10280 5 0 5 5 0 92 0 dma8192 8192 1 0 1 1 0 1 1 0 8 1 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 128 257 0 257 4 3 1 1 0 8 1 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 26 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1370 0 1339 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1370 0 1339 1 0 1 1 0 8 0 vmmpekpl 168 12807 0 12746 3 0 3 3 0 8 0 vmmpepl 168 93088 0 91112 104 6 98 102 0 357 4 vmsppl 480 1369 0 1339 5 0 5 5 0 8 0 rwobjpl 72 30066 0 25055 93 0 93 93 0 8 0 pdppl 4096 2747 0 2678 117 44 73 85 0 8 4 pvpl 32 17134 0 0 140 1 139 139 0 265 0 pmappl 256 1369 0 1339 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 454 0 56 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8381dff0) 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+0x1d7 acpitimer_read sys/dev/acpi/acpitimer.c:146 [inline] acpitimer_delay(1) at acpitimer_delay+0x1d7 sys/dev/acpi/acpitimer.c:125 comcnputc(800,6e) at comcnputc+0x11a sys/dev/ic/com.c:1259 cnputc(6e) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(6e) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff83385467) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80002a3243f0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,2,ffff80002a3243f0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a3243f0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 end trace frame: 0xffff80002a324830, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8381dff0) 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+0x1d7 acpitimer_read sys/dev/acpi/acpitimer.c:146 [inline] acpitimer_delay(1) at acpitimer_delay+0x1d7 sys/dev/acpi/acpitimer.c:125 comcnputc(800,6e) at comcnputc+0x11a sys/dev/ic/com.c:1259 cnputc(6e) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(6e) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x843 sys/kern/subr_prf.c:-1 db_printf(ffffffff83385467) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80002a3243f0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,2,ffff80002a3243f0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002a3243f0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80002a324840) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a324840) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xeb6fc8851e0, 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: 0x7adfc368b340, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7adfc368b340, count: -1