*cpu1: uvm_fault(0xfffffd806b7407a0, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7356da2f1820, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80002a2e8030 rbx 0 rdx 0 rcx 0xffff80002a292800 rax 0x34 r8 0xffff80002a2e7f60 r9 0 r10 0xfb00a0966be038e2 r11 0x308a3f28dece9008 r12 0 r13 0 r14 0xffff80002a292800 r15 0 rip 0xffffffff819b43ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2e7fb0 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{0}> show proc PROC (syz-executor) tid=396824 pid=1573 tcnt=1 stat=onproc flags process=2 proc=0 runpri=24, usrpri=50, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a291810,0xffff80002a291d70 process=0xffff80002a2797d0 user=0xffff80002a2e3000, vmspace=0xfffffd806e056790 estcpu=0, cpticks=1, pctcpu=0.20, user=1, sys=30, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 53904 477097 17418 0 2 0 syz-executor 53904 338626 17418 0 3 0x4000080 fifow syz-executor 81377 199223 95085 0 2 0 syz-executor 81377 215070 95085 0 3 0x4000080 fsleep syz-executor 27683 501190 66413 0 2 0 syz-executor 27683 421276 66413 0 3 0x4000080 netcon syz-executor 53155 480687 97685 0 2 0 syz-executor 53155 29632 97685 0 3 0x4000080 fsleep syz-executor 76858 205282 78137 0 2 0 syz-executor 76858 393399 78137 0 3 0x4000080 kqsel syz-executor 76858 107117 78137 0 3 0x4000080 fsleep syz-executor 76858 30490 78137 0 2 0x4000000 syz-executor 99021 182323 0 0 3 0x14280 nfsidl nfsio 8239 335185 0 0 3 0x14280 nfsidl nfsio 93264 248762 0 0 3 0x14280 nfsidl nfsio 22189 298374 0 0 3 0x14280 nfsidl nfsio 30515 215605 0 0 3 0x14280 nfsidl nfsio 62583 415606 0 0 3 0x14280 nfsidl nfsio 686 46061 0 0 3 0x14280 nfsidl nfsio 18867 441801 0 0 3 0x14280 nfsidl nfsio 28005 410376 0 0 3 0x14280 nfsidl nfsio 75923 183577 0 0 3 0x14280 nfsidl nfsio 12167 244686 0 0 3 0x14280 nfsidl nfsio 38606 82247 0 0 3 0x14280 nfsidl nfsio 29861 157812 0 0 3 0x14280 nfsidl nfsio 66556 61962 0 0 3 0x14280 nfsidl nfsio 64558 332085 0 0 3 0x14280 nfsidl nfsio 83814 225872 0 0 3 0x14280 nfsidl nfsio 75137 416283 0 0 3 0x14280 nfsidl nfsio 84693 87550 0 0 3 0x14280 nfsidl nfsio 61104 516874 0 0 3 0x14280 nfsidl nfsio 62191 52220 0 0 3 0x14280 nfsidl nfsio 36461 215718 0 0 3 0x14200 acct acct 98297 329074 0 0 3 0x14200 bored sosplice 78137 225208 1573 0 3 0x82 nanoslp syz-executor 51050 298631 1573 0 3 0x82 nanoslp syz-executor 78287 231834 1573 0 3 0x82 wait syz-executor 95085 358878 1573 0 3 0x82 nanoslp syz-executor 97685 4783 1573 0 3 0x82 nanoslp syz-executor 66413 382526 1573 0 3 0x82 nanoslp syz-executor 28752 275009 1573 0 2 0x2 syz-executor 17418 339621 1573 0 3 0x82 nanoslp syz-executor * 1573 396824 98828 0 7 0x2 syz-executor 98828 352967 30308 0 3 0x10008a sigsusp ksh 30308 50010 62700 0 3 0x98 kqread sshd-session 62700 483699 84447 0 3 0x92 kqread sshd-session 16782 473257 1 0 3 0x100083 ttyopn getty 84447 60326 1 0 3 0x88 kqread sshd 24383 129017 66116 74 3 0x1100092 bpf pflogd 66116 83607 1 0 3 0x80 sbwait pflogd 22409 504982 4156 73 3 0x1100090 kqread syslogd 4156 148023 1 0 3 0x100082 sbwait syslogd 37256 258511 1 0 3 0x100080 kqread resolvd 38007 22711 37970 77 3 0x100092 kqread dhcpleased 44682 44240 37970 77 3 0x100092 kqread dhcpleased 37970 237457 1 0 3 0x80 kqread dhcpleased 18179 259642 0 0 3 0x14200 bored smr 89928 437310 0 0 2 0x14200 zerothread 11755 102472 0 0 3 0x14200 aiodoned aiodoned 61810 218550 0 0 3 0x14200 syncer update 32203 232506 0 0 3 0x14200 cleaner cleaner 57516 29513 0 0 3 0x14200 reaper reaper 12726 121718 0 0 3 0x14200 pgdaemon pagedaemon 66879 306149 0 0 3 0x14200 bored viomb 14942 472627 0 0 3 0x40014200 acpi0 acpi0 7660 97371 0 0 3 0x40014200 idle1 6512 46478 0 0 3 0x14200 bored softnet3 55722 64376 0 0 3 0x14200 bored softnet2 56923 271558 0 0 3 0x14200 bored softnet1 60078 204286 0 0 3 0x14200 bored softnet0 3272 316466 0 0 3 0x14200 bored systqmp 94947 142252 0 0 3 0x14200 bored systq 9512 325828 0 0 3 0x14200 tmoslp softclockmp 62426 500291 0 0 3 0x40014200 tmoslp softclock 48173 420706 0 0 3 0x40014200 idle0 1 455005 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &sched_lock r = 0 (0xffffffff839a6e10) #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+0x178 sys/kern/kern_lock.c:-1 #2 mtx_enter+0x60 sys/kern/kern_lock.c:239 #3 preempt+0x35 sys/kern/sched_bsd.c:335 #4 ast+0x165 mi_ast sys/sys/syscall_mi.h:252 [inline] #4 ast+0x165 sys/arch/amd64/amd64/trap.c:541 #5 Xsyscall+0x156 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10232 11171K 11410K 166960K 12008 0 pcb 19 15K 17K 166960K 272 0 rtable 219 7K 8K 166960K 390 0 pf 33 17K 21K 166960K 71 0 ifaddr 39 6K 7K 166960K 55 0 ifgroup 51 2K 2K 166960K 73 0 sysctl 2 1K 1K 166960K 2 0 counters 62 36K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1525 0 iov 0 0K 16K 166960K 75 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1407 88K 89K 166960K 1775 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 12 1K 1K 166960K 49 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 450 0 sigio 0 0K 0K 166960K 7 0 proc 72 91K 140K 166960K 557 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 52 0 in_multi 87 6K 7K 166960K 109 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 386 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 240 163K 170K 166960K 5902 0 UVM aobj 10 2K 2K 166960K 10 0 pinsyscall 42 84K 108K 166960K 1528 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 16 0 NDP 11 0K 2K 166960K 34 0 temp 39 8683K 8806K 166960K 12261 0 kqueue 13 20K 32K 166960K 79 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 51 0 48 1 0 1 1 0 8 0 rtentry 176 123 0 23 6 0 6 6 0 8 0 unpcb 144 247 0 227 4 0 4 4 0 8 3 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 174 0 169 7 3 4 7 0 8 3 arp 128 21 0 6 1 0 1 1 0 8 0 inpcb 384 686 0 676 14 6 8 14 0 8 7 nd6 144 26 0 3 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 8 0 8 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 0 1 1 0 8 1 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 1 0 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 41 0 1 1 0 1 1 0 8 0 pfstkey 128 43 0 3 2 0 2 2 0 8 0 pfstate 384 42 0 2 4 0 4 4 0 8 0 pfrule 1344 28 0 21 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 468 0 57 29 0 29 29 0 8 2 art_table 32 469 0 57 4 0 4 4 0 8 0 art_node 16 122 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 47 0 37 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2197 0 686 96 0 96 96 0 8 0 ffsino 288 2197 0 686 109 0 109 109 0 8 0 nchpl 144 2817 0 1123 64 0 64 64 0 8 1 rtmask 32 3 0 3 1 0 1 1 0 8 1 uvmvnodes 80 2558 0 0 53 0 53 53 0 8 0 vnodes 216 2558 0 0 143 0 143 143 0 8 0 namei 1024 9582 0 9582 1 0 1 1 0 8 1 percpumem 16 57 0 11 1 0 1 1 0 8 0 kstatmem 264 36 0 14 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 8974 0 8974 10 2 8 8 1 8 8 plimitpl 152 122 0 104 1 0 1 1 0 8 0 sigapl 424 770 0 699 9 0 9 9 0 8 0 futexpl 64 4921 0 4918 1 0 1 1 0 8 0 knotepl 120 547 0 0 17 0 17 17 0 8 0 kqueuepl 224 113 0 103 2 1 1 2 0 8 0 pipepl 336 119 0 92 3 0 3 3 0 8 0 fdescpl 520 730 0 699 3 0 3 3 0 8 0 filepl 160 4301 0 4078 19 2 17 17 0 8 6 lockfpl 104 85 0 83 1 0 1 1 0 8 0 lockfspl 48 34 0 32 1 0 1 1 0 8 0 sessionpl 144 22 0 13 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 652 0 639 1 0 1 1 0 8 0 zombiepl 144 701 0 699 1 0 1 1 0 8 0 processpl 1216 770 0 699 6 0 6 6 0 8 0 procpl 680 1346 0 1268 8 0 8 8 0 8 0 srpgc 96 2 0 2 1 0 1 1 0 8 1 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 728 990 0 957 18 7 11 15 0 8 8 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 30 0 0 1 0 1 1 0 8 0 mbufpl 256 179 0 0 12 0 12 12 0 8 0 bufpl 280 2901 0 124 199 0 199 199 0 8 0 anonpl 32 7555 0 0 61 0 61 61 0 246 0 amapchunkpl 152 18136 0 17645 28 0 28 28 0 158 7 amappl16 200 2386 0 2353 18 6 12 15 0 8 8 amappl15 192 49 0 49 2 1 1 1 0 8 1 amappl14 184 111 0 99 1 0 1 1 0 8 0 amappl13 176 48 0 48 1 1 0 1 0 8 0 amappl12 168 1374 0 1343 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 257 0 255 1 0 1 1 0 8 0 amappl8 136 21 0 19 1 0 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 171 0 167 1 0 1 1 0 8 0 amappl5 112 192 0 182 1 0 1 1 0 8 0 amappl4 104 311 0 292 1 0 1 1 0 8 0 amappl3 96 3356 0 3245 4 0 4 4 0 8 0 amappl2 88 633 0 571 2 0 2 2 0 8 0 amappl1 80 9316 0 8708 16 3 13 16 0 8 0 amappl 88 5170 0 5003 5 0 5 5 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 128 254 0 254 2 1 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 730 0 699 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 730 0 699 1 0 1 1 0 8 0 vmmpekpl 168 7484 0 7445 3 0 3 3 0 8 1 vmmpepl 168 51505 0 49514 100 0 100 100 0 357 10 vmsppl 480 729 0 699 5 0 5 5 0 8 1 rwobjpl 72 18547 0 15042 65 1 64 64 0 8 0 pdppl 4096 1468 0 1398 104 32 72 88 0 8 2 pvpl 32 14045 0 0 114 0 114 114 0 265 0 pmappl 256 729 0 699 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 402 0 38 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7356da2f1820, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,6e) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6e) at comcnputc+0x250 sys/dev/ic/com.c:1269 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(ffffffff83379e5e) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c42e6a0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c42e6a0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c42e6a0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148f000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff80002a2d6a90) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a2d6a90) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c42e840, count: 0 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:654 comcnputc(800,6e) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6e) at comcnputc+0x250 sys/dev/ic/com.c:1269 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(ffffffff83379e5e) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c42e6a0) at db_ktrap+0x101 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c42e6a0) at db_ktrap+0x101 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c42e6a0) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148f000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:579 dtclose(11e5f,81,2000,ffff80002a2d6a90) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a2d6a90) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c42e850) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806b029dd8,81,fffffd807f7d3750,ffff80002a2d6a90) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b0ab8b0,ffff80002a2d6a90) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b0ab8b0,ffff80002a2d6a90) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b0ab8b0,ffff80002a2d6a90) at fdrop+0x126 sys/kern/kern_descrip.c:1265 closef(fffffd806b0ab8b0,ffff80002a2d6a90) at closef+0x192 sys/kern/kern_descrip.c:1249 fdfree(ffff80002a2d6a90) at fdfree+0x116 sys/kern/kern_descrip.c:1181 exit1(ffff80002a2d6a90,b,0,1) at exit1+0x58f sys/kern/kern_exit.c:214 sys_exit(ffff80002a2d6a90,ffff80003c42ebc0,ffff80003c42eb10) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c42ebc0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c42ebc0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x70843ab77c00, count: -24