*cpu0: uvm_fault(0xfffffd806bd31798, 0x3ca0, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7e4d2f2d02b0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a31c970 rbx 0 rdx 0 rcx 0xffff80002a2a5498 rax 0x3a r8 0xffff80002a31c8a0 r9 0x1 r10 0x84c8668e6d698834 r11 0x1304206a39fbfb3e r12 0 r13 0 r14 0xffff80002a2a5498 r15 0 rip 0xffffffff8324a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a31c8f0 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=117312 pid=77021 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=0xffff80002a2a4f78,0xffff80002a2a5738 process=0xffff8000ffff4958 user=0xffff80002a317000, vmspace=0xfffffd8009ede000 estcpu=36, cpticks=1, pctcpu=0.6, user=0, sys=23, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 63997 214326 77021 0 2 0 syz-executor 63997 302424 77021 0 7 0x4000000 syz-executor 16927 211378 57170 0 2 0 syz-executor 16927 27029 57170 0 3 0x4000080 fsleep syz-executor 55551 272192 79376 0 2 0 syz-executor 55551 102641 79376 0 2 0x4000000 syz-executor 3788 64352 2030 0 2 0 syz-executor 3788 476212 2030 0 3 0x4000080 kqsel syz-executor 3788 416350 2030 0 3 0x4000080 fsleep syz-executor 38936 226914 25936 60928 2 0x10 syz-executor 38936 91353 25936 60928 3 0x4000090 fsleep syz-executor 56806 116074 11115 0 2 0x480 syz-executor 56806 447011 11115 0 3 0x4000080 fsleep syz-executor 35771 507172 1 0 3 0x82 nanoslp getty 18216 37526 0 0 3 0x14200 acct acct 62626 197550 0 0 3 0x14200 bored sosplice 11115 67186 3727 0 2 0x482 syz-executor 57170 194965 3727 0 2 0x482 syz-executor 79376 487409 3727 0 2 0x482 syz-executor 52007 257476 3727 0 3 0x82 wait syz-executor 66495 406817 3727 0 3 0x82 wait syz-executor 25936 9876 3727 0 2 0x2 syz-executor *77021 117312 3727 0 7 0x2 syz-executor 2030 467356 3727 0 2 0x482 syz-executor 3727 460270 45877 0 3 0x82 kqread syz-executor 45877 165343 20318 0 3 0x10008a sigsusp ksh 20318 318908 90546 0 3 0x98 kqread sshd-session 90546 311342 73589 0 3 0x92 kqread sshd-session 73589 340511 1 0 3 0x88 kqread sshd 71223 328549 33863 74 3 0x1100092 bpf pflogd 33863 307519 1 0 3 0x80 sbwait pflogd 81097 490181 15731 73 3 0x1100090 kqread syslogd 15731 153771 1 0 3 0x100082 sbwait syslogd 44646 288964 1 0 3 0x100080 kqread resolvd 50594 272002 52603 77 3 0x100092 kqread dhcpleased 99992 261997 52603 77 3 0x100092 kqread dhcpleased 52603 212420 1 0 3 0x80 kqread dhcpleased 81166 501264 0 0 3 0x14200 bored smr 16245 123750 0 0 2 0x14200 zerothread 76050 411127 0 0 3 0x14200 aiodoned aiodoned 96865 126819 0 0 3 0x14200 syncer update 57785 425453 0 0 3 0x14200 cleaner cleaner 89914 223366 0 0 3 0x14200 reaper reaper 80900 93908 0 0 3 0x14200 pgdaemon pagedaemon 54134 316957 0 0 3 0x14200 bored viomb 27306 523713 0 0 3 0x40014200 acpi0 acpi0 60221 90395 0 0 3 0x40014200 idle1 65391 517236 0 0 3 0x14200 bored softnet3 14692 7294 0 0 3 0x14200 bored softnet2 81165 263878 0 0 3 0x14200 bored softnet1 29149 398341 0 0 3 0x14200 bored softnet0 30598 392273 0 0 3 0x14200 bored systqmp 10799 481061 0 0 3 0x14200 bored systq 32438 254540 0 0 3 0x14200 tmoslp softclockmp 30382 314259 0 0 2 0x40014200 softclock 36931 482614 0 0 3 0x40014200 idle0 1 229691 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 (0xffffffff8394f4f8) #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 sleep_finish+0x24f sys/kern/kern_synch.c:412 #4 sys_nanosleep+0x28a sys/kern/kern_time.c:303 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 11041K 11365K 166960K 11963 0 pcb 17 16K 21K 166960K 240 0 rtable 214 7K 7K 166960K 414 0 pf 35 17K 81K 166960K 75 0 ifaddr 38 6K 7K 166960K 54 0 ifgroup 51 2K 2K 166960K 70 0 sysctl 1 1K 2K 166960K 2 0 counters 62 36K 37K 166960K 78 0 ioctlops 0 0K 4K 166960K 1625 0 iov 0 0K 16K 166960K 20 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1397 88K 88K 166960K 1878 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 10 0K 0K 166960K 12 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 497 0 sigio 0 0K 0K 166960K 6 0 proc 73 103K 128K 166960K 582 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 115 0 in_multi 87 6K 7K 166960K 111 0 ether_multi 1 0K 0K 166960K 3 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 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 405 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 258 168K 186K 166960K 6397 0 UVM aobj 78 3K 4K 166960K 79 0 pinsyscall 43 86K 108K 166960K 1624 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 34 0 NDP 11 0K 2K 166960K 34 0 temp 47 8677K 8743K 166960K 19234 0 kqueue 15 20K 26K 166960K 74 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 120 131 0 127 3 2 1 3 0 8 0 rtentry 176 116 0 18 6 0 6 6 0 8 0 unpcb 144 399 0 382 3 2 1 2 0 8 0 syncache 336 10 0 10 3 2 1 1 0 8 1 tcpqe 32 4 0 4 2 2 0 1 0 8 0 tcpcb 808 246 0 237 12 10 2 8 0 8 0 arp 128 18 0 4 1 0 1 1 0 8 0 inpcb 384 643 0 628 18 16 2 15 0 8 0 nd6 144 27 0 3 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 6 0 6 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 4 0 1 1 0 1 1 0 482 0 pffrnode 88 4 0 1 1 0 1 1 0 8 0 pffrent 40 6 0 3 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 1 0 0 1 0 1 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 20 0 3 1 0 1 1 0 8 0 pfstkey 128 22 0 5 1 0 1 1 0 8 0 pfstate 384 20 0 4 2 0 2 2 0 8 0 pfrule 1344 26 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 465 0 54 29 1 28 29 0 8 0 art_table 32 466 0 54 4 0 4 4 0 8 0 art_node 16 114 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 3 1 0 1 1 0 8 0 semapl 112 10 0 2 1 0 1 1 0 8 0 shmpl 112 76 0 1 3 0 3 3 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2382 0 877 95 0 95 95 0 8 0 ffsino 288 2382 0 877 109 0 109 109 0 8 0 nchpl 144 3076 0 1381 63 0 63 63 0 8 0 uvmvnodes 80 2721 0 0 56 0 56 56 0 8 0 vnodes 216 2721 0 0 152 0 152 152 0 8 0 namei 1024 10544 0 10544 4 3 1 2 0 8 1 percpumem 16 54 0 8 1 0 1 1 0 8 0 kstatmem 264 36 0 14 2 0 2 2 0 8 0 scsiplug 72 3 0 3 1 1 0 1 0 8 0 scxspl 216 9446 0 9446 13 12 1 8 1 8 1 plimitpl 152 88 0 71 1 0 1 1 0 8 0 sigapl 424 809 0 757 7 1 6 7 0 8 0 futexpl 64 6019 0 6015 1 0 1 1 0 8 0 knotepl 120 794 0 0 25 0 25 25 0 8 0 kqueuepl 224 115 0 104 2 1 1 2 0 8 0 pipepl 336 158 0 130 4 1 3 3 0 8 0 fdescpl 520 788 0 756 3 0 3 3 0 8 0 filepl 160 4936 0 4713 24 11 13 16 0 8 3 lockfpl 104 275 0 273 2 1 1 2 0 8 0 lockfspl 48 58 0 56 1 0 1 1 0 8 0 sessionpl 144 29 0 21 1 0 1 1 0 8 0 pgrppl 48 38 0 22 1 0 1 1 0 8 0 ucredpl 104 786 0 772 1 0 1 1 0 8 0 zombiepl 144 759 0 757 3 2 1 1 0 8 0 processpl 1192 809 0 757 5 0 5 5 0 8 0 procpl 656 1466 0 1407 7 1 6 6 0 8 0 srpgc 96 2 0 2 1 1 0 1 0 8 0 sosppl 168 2 0 2 2 2 0 1 0 8 0 sockpl 728 1180 0 1144 26 21 5 16 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 127 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 24 0 0 3 0 3 3 0 8 0 mtagpl 96 64 0 0 2 0 2 2 0 8 0 mbufpl 256 420 0 0 26 0 26 26 0 8 0 bufpl 280 3159 0 128 217 0 217 217 0 8 0 anonpl 32 8354 0 0 67 0 67 67 0 246 0 amapchunkpl 152 19742 0 19150 37 9 28 30 0 158 4 amappl16 200 2469 0 2434 13 9 4 11 0 8 0 amappl15 192 25 0 25 2 2 0 1 0 8 0 amappl14 184 122 0 110 1 0 1 1 0 8 0 amappl13 176 5 0 5 1 1 0 1 0 8 0 amappl12 168 1435 0 1403 4 1 3 3 0 8 0 amappl11 160 50 0 36 1 0 1 1 0 8 0 amappl10 152 6 0 6 2 2 0 1 0 8 0 amappl9 144 292 0 292 2 2 0 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 125 0 113 1 0 1 1 0 8 0 amappl6 120 187 0 184 2 1 1 1 0 8 0 amappl5 112 125 0 115 1 0 1 1 0 8 0 amappl4 104 343 0 323 1 0 1 1 0 8 0 amappl3 96 3785 0 3663 6 2 4 4 0 8 0 amappl2 88 700 0 635 2 0 2 2 0 8 0 amappl1 80 11189 0 10582 16 0 16 16 0 8 1 amappl 88 5602 0 5416 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 128 255 0 255 3 3 0 1 0 8 0 dma64 64 7 0 7 2 2 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 78 0 1 2 0 2 2 0 8 0 uaddrrnd 24 788 0 756 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 788 0 756 1 0 1 1 0 8 0 vmmpekpl 168 8870 0 8828 3 0 3 3 0 8 0 vmmpepl 168 57271 0 55225 113 17 96 103 0 357 4 vmsppl 480 787 0 756 6 1 5 5 0 8 0 rwobjpl 72 20917 0 17159 71 2 69 69 0 8 0 pdppl 4096 1584 0 1512 124 50 74 86 0 8 2 pvpl 32 15525 0 0 125 0 125 125 0 265 0 pmappl 256 787 0 756 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 438 0 69 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837e1ff0) 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(800,70) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,70) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(70) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8337c6cd) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003bc17660) at db_ktrap+0x169 db_printtrap sys/arch/amd64/amd64/db_interface.c:102 [inline] db_ktrap(6,2,ffff80003bc17660) at db_ktrap+0x169 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003bc17660) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003bc17ab0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc17ab0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 end trace frame: 0xffff80003bc17b30, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837e1ff0) 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(800,70) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,70) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(70) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(70) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8337c6cd) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003bc17660) at db_ktrap+0x169 db_printtrap sys/arch/amd64/amd64/db_interface.c:102 [inline] db_ktrap(6,2,ffff80003bc17660) at db_ktrap+0x169 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003bc17660) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003bc17ab0) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003bc17ab0) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x580fb872810, count: -15 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x7e4d2f2d02b0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7e4d2f2d02b0, count: -1