*cpu0: uvm_fault(0xfffffd806bd0d3e0, 0x184e0, 0, 2) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7bf6d81f72e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a382cc0 rbx 0 rdx 0 rcx 0xffff80002a2bb210 rax 0x3b r8 0xffff80002a382bf0 r9 0x1 r10 0x9a031d3b10ec234d r11 0x4367e1c2b00da21e r12 0 r13 0 r14 0xffff80002a2bb210 r15 0 rip 0xffffffff82fb43ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a382c40 ss 0x10 savectx+0xae: movl $0,%gs:0x680 ddb{1}> show proc PROC (syz-executor) tid=13661 pid=74623 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=0xffff80002a2bb9c0,0xffff80002a2baf90 process=0xffff8000ffff5750 user=0xffff80002a37d000, vmspace=0xfffffd807eb8e3c0 estcpu=36, cpticks=1, pctcpu=0.2, user=1, sys=13, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 976 329231 19975 0 2 0 syz-executor 976 37799 19975 0 7 0x4000000 syz-executor 976 42584 19975 0 3 0x4000080 fsleep syz-executor 18357 232283 97001 0 2 0x480 syz-executor 18357 81345 97001 0 3 0x4000080 ttyopn syz-executor 18357 241671 97001 0 3 0x4000080 fsleep syz-executor 18357 376437 97001 0 3 0x4000080 fsleep syz-executor 85349 517374 74623 0 2 0x480 syz-executor 85349 222730 74623 0 3 0x4000080 kqsel syz-executor 29269 194354 90081 0 2 0x480 syz-executor 29269 404905 90081 0 3 0x4000080 ttyout syz-executor 29269 99587 90081 0 3 0x4000080 fsleep syz-executor 93189 491876 98551 0 2 0x480 syz-executor 93189 286279 98551 0 3 0x4000080 wsevent_read syz-executor 93189 116213 98551 0 3 0x4000080 fsleep syz-executor 93189 102832 98551 0 3 0x4000080 fsleep syz-executor 6458 22991 40706 0 2 0x480 syz-executor 6458 150857 40706 0 3 0x4000080 rest syz-executor 7932 333814 0 0 3 0x14200 bored sosplice 40706 270873 87796 0 2 0x482 syz-executor 97001 193347 87796 0 2 0x482 syz-executor 74790 236144 87796 0 2 0x482 syz-executor *74623 13661 87796 0 7 0x2 syz-executor 8068 69912 87796 0 3 0x82 wait syz-executor 19975 304141 87796 0 2 0x2 syz-executor 90081 284610 87796 0 2 0x482 syz-executor 98551 200204 87796 0 2 0x482 syz-executor 87796 80093 11496 0 3 0x82 kqread syz-executor 11496 112395 40753 0 3 0x10008a sigsusp ksh 40753 106065 73511 0 3 0x98 kqread sshd-session 73511 393580 37617 0 3 0x92 kqread sshd-session 33974 7454 1 0 3 0x100083 ttyin getty 37617 192571 1 0 3 0x88 kqread sshd 81885 438429 92804 74 3 0x1100092 bpf pflogd 92804 395811 1 0 3 0x80 sbwait pflogd 54026 259362 18379 73 3 0x1100090 kqread syslogd 18379 407496 1 0 3 0x100082 sbwait syslogd 58728 153898 1 0 3 0x100080 kqread resolvd 22840 396654 56798 77 3 0x100092 kqread dhcpleased 79373 322647 56798 77 3 0x100092 kqread dhcpleased 56798 228723 1 0 3 0x80 kqread dhcpleased 78038 229050 0 0 3 0x14200 bored smr 82220 238221 0 0 3 0x14200 pgzero zerothread 5704 330877 0 0 3 0x14200 aiodoned aiodoned 20838 340644 0 0 3 0x14200 syncer update 98178 21303 0 0 3 0x14200 cleaner cleaner 68828 84162 0 0 3 0x14200 reaper reaper 25130 356483 0 0 3 0x14200 pgdaemon pagedaemon 69548 55759 0 0 3 0x14200 bored viomb 42554 274486 0 0 3 0x40014200 acpi0 acpi0 99334 390270 0 0 3 0x40014200 idle1 99675 517715 0 0 3 0x14200 bored softnet3 15664 112053 0 0 3 0x14200 bored softnet2 66773 330978 0 0 3 0x14200 bored softnet1 69552 440286 0 0 3 0x14200 bored softnet0 82112 407086 0 0 3 0x14200 bored systqmp 24970 158593 0 0 3 0x14200 bored systq 31443 43762 0 0 3 0x14200 tmoslp softclockmp 3322 163358 0 0 2 0x40014200 softclock 13888 253958 0 0 3 0x40014200 idle0 1 39638 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &sched_lock r = 0 (0xffffffff839a5c50) #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 10202 11072K 11365K 166960K 11855 0 pcb 20 13K 14K 166960K 106 0 rtable 182 5K 7K 166960K 408 0 pf 34 17K 19K 166960K 67 0 ifaddr 34 5K 8K 166960K 59 0 ifgroup 54 2K 2K 166960K 81 0 sysctl 3 1K 1K 166960K 3 0 counters 62 36K 37K 166960K 82 0 ioctlops 0 0K 4K 166960K 1514 0 iov 0 0K 16K 166960K 15 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1338 84K 84K 166960K 1606 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 11 0K 1K 166960K 14 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 93K 166960K 440 0 sigio 0 0K 0K 166960K 34 0 proc 75 103K 140K 166960K 595 0 subproc 72 4K 4K 166960K 81 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 19 0 in_multi 67 5K 7K 166960K 113 0 ether_multi 1 0K 0K 166960K 1 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 406 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 263 152K 161K 166960K 5760 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 43 86K 103K 166960K 1574 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 14 0 NDP 11 0K 1K 166960K 38 0 temp 46 8684K 8749K 166960K 22322 0 kqueue 16 23K 28K 166960K 84 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 62 0 59 1 0 1 1 0 8 0 rtentry 176 126 0 43 6 0 6 6 0 8 0 unpcb 144 236 0 217 2 0 2 2 0 8 1 syncache 336 3 0 3 1 1 0 1 0 8 0 tcpcb 808 70 0 64 1 0 1 1 0 8 0 arp 128 22 0 7 1 0 1 1 0 8 0 inpcb 384 501 0 487 9 1 8 9 0 8 6 nd6 144 28 0 12 1 0 1 1 0 8 0 pkpcb 40 3 0 3 1 0 1 1 0 8 1 kcovpl 48 9 0 1 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 0 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 3 0 1 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 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 42 0 2 1 0 1 1 0 8 0 pfstkey 128 44 0 4 2 0 2 2 0 8 0 pfstate 384 43 0 3 4 0 4 4 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 505 0 179 29 0 29 29 0 8 5 art_table 32 506 0 179 4 0 4 4 0 8 0 art_node 16 125 0 50 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semapl 112 11 0 2 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 2125 0 619 95 0 95 95 0 8 0 ffsino 288 2125 0 619 109 0 109 109 0 8 0 nchpl 144 2723 0 1030 63 0 63 63 0 8 0 uvmvnodes 80 2351 0 0 48 0 48 48 0 8 0 vnodes 216 2351 0 0 131 0 131 131 0 8 0 namei 1024 8762 0 8762 2 1 1 2 0 8 1 percpumem 16 56 0 10 1 0 1 1 0 8 0 kstatmem 264 40 0 18 3 0 3 3 0 8 1 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 8666 0 8666 4 2 2 2 1 8 2 plimitpl 152 68 0 49 1 0 1 1 0 8 0 sigapl 424 746 0 695 8 2 6 7 0 8 0 futexpl 64 4860 0 4854 1 0 1 1 0 8 0 knotepl 120 462 0 0 14 0 14 14 0 8 0 kqueuepl 224 166 0 153 3 1 2 3 0 8 1 pipepl 336 128 0 101 3 0 3 3 0 8 0 fdescpl 520 727 0 695 3 0 3 3 0 8 0 filepl 160 3674 0 3433 14 1 13 14 0 8 2 lockfpl 104 91 0 89 1 0 1 1 0 8 0 lockfspl 48 42 0 40 1 0 1 1 0 8 0 sessionpl 144 23 0 14 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 350 0 336 1 0 1 1 0 8 0 zombiepl 144 697 0 695 1 0 1 1 0 8 0 processpl 1192 746 0 695 5 0 5 5 0 8 0 procpl 656 1297 0 1234 7 1 6 6 0 8 0 srpgc 96 8 0 8 2 1 1 1 0 8 1 sosppl 168 4 0 4 1 0 1 1 0 8 1 sockpl 728 805 0 769 10 0 10 10 0 8 6 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 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 31 0 0 4 0 4 4 0 8 1 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 175 0 0 11 0 11 11 0 8 0 bufpl 280 3044 0 124 209 0 209 209 0 8 0 anonpl 32 7627 0 0 62 0 62 62 0 246 0 amapchunkpl 152 17829 0 17197 28 2 26 26 0 158 1 amappl16 200 2681 0 2580 18 6 12 14 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 115 0 102 1 0 1 1 0 8 0 amappl13 176 7 0 7 2 1 1 1 0 8 1 amappl12 168 1396 0 1364 4 2 2 3 0 8 0 amappl11 160 53 0 39 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 22 0 19 1 0 1 1 0 8 0 amappl7 128 125 0 112 1 0 1 1 0 8 0 amappl6 120 190 0 187 1 0 1 1 0 8 0 amappl5 112 123 0 113 1 0 1 1 0 8 0 amappl4 104 321 0 301 1 0 1 1 0 8 0 amappl3 96 3333 0 3206 4 0 4 4 0 8 0 amappl2 88 652 0 590 2 0 2 2 0 8 0 amappl1 80 9613 0 9002 15 1 14 15 0 8 0 amappl 88 4979 0 4787 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 128 253 0 253 1 1 0 1 0 8 0 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 727 0 695 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 727 0 695 1 0 1 1 0 8 0 vmmpekpl 168 7425 0 7381 4 1 3 4 0 8 0 vmmpepl 168 52047 0 49906 100 2 98 100 0 357 1 vmsppl 480 726 0 695 5 0 5 5 0 8 0 rwobjpl 72 18908 0 15499 63 0 63 63 0 8 0 pdppl 4096 1461 0 1390 99 28 71 85 0 8 0 pvpl 32 16008 0 0 131 1 130 130 0 265 0 pmappl 256 726 0 695 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 383 0 32 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83892ff0) 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+0x58 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x58 sys/dev/acpi/acpitimer.c:120 comcnputc(800,61) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8337ab35) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003c453410) at db_ktrap+0x169 db_printtrap sys/arch/amd64/amd64/db_interface.c:102 [inline] db_ktrap(6,2,ffff80003c453410) at db_ktrap+0x169 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c453410) 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: 0xffff80003c453850, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83892ff0) 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+0x58 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline] acpitimer_delay(1) at acpitimer_delay+0x58 sys/dev/acpi/acpitimer.c:120 comcnputc(800,61) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(61) at cnputc+0x61 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x65c sys/ddb/db_output.c:155 kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065 db_printf(ffffffff8337ab35) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,2,ffff80003c453410) at db_ktrap+0x169 db_printtrap sys/arch/amd64/amd64/db_interface.c:102 [inline] db_ktrap(6,2,ffff80003c453410) at db_ktrap+0x169 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c453410) at kerntrap+0x1dc sys/arch/amd64/amd64/trap.c:323 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x57 syscall(ffff80003c453860) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c453860) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x697acc62100, count: -16 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x680 savectx() at savectx+0xae end of kernel end trace frame: 0x7bf6d81f72e0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7bf6d81f72e0, count: -1