*cpu0: uvm_fault(0xfffffd80643e9210, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f13a06b3ff0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff8000393fdbf0 rbx 0 rdx 0 rcx 0xffff80003ac03250 rax 0x3c r8 0xffff8000393fdb20 r9 0 r10 0xbbbe1d8641f5fa05 r11 0xb8d8fe8e9603b442 r12 0 r13 0 r14 0xffff80003ac03250 r15 0 rip 0xffffffff8178f3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff8000393fdb70 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=171196 pid=41118 tcnt=4 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003ac02028,0xffff80003ac03790 process=0xffff80003c4d5838 user=0xffff8000393f8000, vmspace=0xfffffd800b0635b8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *41118 171196 97842 0 7 0 syz-executor 41118 187278 97842 0 2 0x4000080 syz-executor 41118 499037 97842 0 2 0x4000080 syz-executor 41118 84386 97842 0 3 0x4000080 fsleep syz-executor 78832 297677 24424 0 2 0 syz-executor 78832 316257 24424 0 3 0x4000080 fsleep syz-executor 78832 373787 24424 0 3 0x4000080 fsleep syz-executor 8503 397425 74283 0 2 0 syz-executor 8503 12236 74283 0 3 0x4000080 kqsel syz-executor 8503 127158 74283 0 3 0x4000080 kqsel syz-executor 19601 401275 46183 0 2 0 syz-executor 19601 317865 46183 0 3 0x4000080 fsleep syz-executor 50808 27568 72859 0 3 0x80 nanoslp syz-executor 50808 302341 72859 0 3 0x4000080 fsleep syz-executor 50808 2351 72859 0 3 0x4000080 kqread syz-executor 62755 303631 1 0 3 0x80 nanoslp init 63327 3135 9319 0 3 0x82 nanoslp syz-executor 74283 423042 9319 0 3 0x82 nanoslp syz-executor 24424 457688 9319 0 3 0x82 nanoslp syz-executor 97842 38446 9319 0 3 0x82 nanoslp syz-executor 425 488886 9319 0 3 0x82 nanoslp syz-executor 72859 330634 9319 0 3 0x82 nanoslp syz-executor 46183 172154 9319 0 3 0x82 nanoslp syz-executor 33006 366233 9319 0 3 0x82 nanoslp syz-executor 9319 217050 86273 0 3 0x82 kqread syz-executor 86273 293657 46360 0 3 0x10008a sigsusp ksh 46360 495522 61218 0 3 0x98 kqread sshd-session 61218 254841 93532 0 3 0x92 kqread sshd-session 93532 1656 1 0 3 0x88 kqread sshd 43916 414004 82802 74 3 0x1100092 bpf pflogd 82802 447496 1 0 3 0x80 sbwait pflogd 63849 262524 51051 73 3 0x1100090 kqread syslogd 51051 151027 1 0 3 0x100082 sbwait syslogd 22089 154608 1 0 3 0x100080 kqread resolvd 93739 392546 30256 77 3 0x100092 kqread dhcpleased 44938 178689 30256 77 3 0x100092 kqread dhcpleased 30256 17837 1 0 3 0x80 kqread dhcpleased 74912 380908 0 0 3 0x14200 bored smr 91447 10368 0 0 2 0x14200 zerothread 8935 99435 0 0 3 0x14200 aiodoned aiodoned 64064 73580 0 0 3 0x14200 syncer update 4056 93836 0 0 3 0x14200 cleaner cleaner 40621 166875 0 0 3 0x14200 reaper reaper 24127 178830 0 0 3 0x14200 pgdaemon pagedaemon 75353 259477 0 0 3 0x14200 bored viomb 64427 140177 0 0 3 0x40014200 acpi0 acpi0 51162 50289 0 0 3 0x40014200 idle1 59562 250910 0 0 3 0x14200 bored softnet1 3938 294566 0 0 3 0x14200 bored softnet0 11542 446911 0 0 3 0x14200 bored systqmp 46178 350327 0 0 3 0x14200 bored systq 57159 3589 0 0 3 0x14200 tmoslp softclockmp 45617 98843 0 0 3 0x40014200 tmoslp softclock 66817 39905 0 0 3 0x40014200 idle0 1 162936 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 (0xffffffff839572e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #3 futex_wake+0x245 sys/kern/sys_futex.c:482 #4 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 41118 (syz-executor) thread 0xffff80003ac03250 (171196) exclusive rwlock futexlk r = 0 (0xffffffff838fba28) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 futex_wake+0xbc sys/kern/sys_futex.c:467 #3 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #5 Xsyscall+0x128 exclusive mutex &sched_lock r = 0 (0xffffffff839572e8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311 #2 mtx_enter+0x62 sys/kern/kern_lock.c:261 #3 futex_wake+0x245 futex_list_wakeup sys/kern/sys_futex.c:345 [inline] #3 futex_wake+0x245 sys/kern/sys_futex.c:482 #4 sys_futex+0x1d9 sys/kern/sys_futex.c:158 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10218 11097K 11479K 166960K 13650 0 pcb 17 18K 20K 166960K 462 0 rtable 217 11K 13K 166960K 803 0 pf 38 18K 81K 166960K 256 0 ifaddr 37 6K 8K 166960K 170 0 ifgroup 54 2K 3K 166960K 304 0 sysctl 4 1K 9K 166960K 18 0 counters 70 37K 38K 166960K 306 0 ioctlops 0 0K 6K 166960K 1914 0 iov 0 0K 16K 166960K 121 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1456 92K 92K 166960K 2852 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 10K 166960K 27 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 71 0 dirhash 51 9K 18K 166960K 2325 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 110K 166960K 1867 0 sigio 0 0K 0K 166960K 64 0 proc 64 99K 180K 166960K 888 0 subproc 72 4K 4K 166960K 126 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 296 0 in_multi 73 5K 7K 166960K 236 0 ether_multi 1 0K 0K 166960K 16 0 mrt 2 0K 0K 166960K 27 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 964 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 259 162K 176K 166960K 18623 0 UVM aobj 32 10K 12K 166960K 37 0 pinsyscall 42 84K 103K 166960K 3192 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 122 0 NDP 12 0K 1K 166960K 118 0 temp 82 8680K 8804K 166960K 92429 0 kqueue 16 26K 34K 166960K 350 0 SYN cache 2 8K 16K 166960K 3 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 120 269 0 266 4 3 1 3 0 8 0 rtentry 176 234 0 152 6 0 6 6 0 8 0 unpcb 144 1195 0 1176 12 6 6 6 0 8 5 syncache 336 11 0 11 5 5 0 1 0 8 0 tcpqe 32 7 0 7 1 1 0 1 0 8 0 tcpcb 736 429 0 425 4 3 1 4 0 8 0 arp 136 35 0 20 1 0 1 1 0 8 0 inpcb 328 2261 0 2122 32 20 12 12 0 8 0 nd6 152 48 0 28 2 0 2 2 0 8 0 pkpcb 40 10 0 10 5 4 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 ppxss 1192 83 0 82 1 0 1 1 0 8 0 pppxif 1504 19 0 19 4 3 1 1 0 8 1 pfstscr 40 2 0 2 2 2 0 1 0 8 0 pffrag 232 16 0 5 1 0 1 1 0 482 0 pffrnode 88 16 0 5 1 0 1 1 0 8 0 pffrent 40 70 0 59 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 7 0 7 4 3 1 1 0 8 1 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 124 0 31 1 0 1 1 0 8 0 pfstkey 128 127 0 34 4 0 4 4 0 8 0 pfstate 448 126 0 33 12 1 11 11 0 8 0 pfrule 1344 34 0 29 2 1 1 2 0 8 0 rttmr 136 8 0 8 3 2 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1087 0 730 34 8 26 31 0 8 3 art_table 40 1090 0 730 5 0 5 5 0 8 0 art_node 32 233 0 160 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 5 2 1 1 1 0 8 0 semapl 112 63 0 53 1 0 1 1 0 8 0 shmpl 112 26 0 1 1 0 1 1 0 8 0 dirhash 1024 788 0 767 6 0 6 6 0 8 1 dino2pl 256 4859 0 3349 96 0 96 96 0 8 0 ffsino 296 4859 0 3349 118 0 118 118 0 8 0 nchpl 144 7414 0 5685 65 0 65 65 0 8 0 rtmask 32 13 0 13 4 3 1 1 0 8 1 vnodes 216 5702 0 0 317 0 317 317 0 8 0 namei 1024 25909 0 25909 4 3 1 2 0 8 1 percpumem 16 168 0 118 1 0 1 1 0 8 0 vcpupl 3968 5 0 1 1 0 1 1 0 8 0 vmpool 840 8 0 4 2 1 1 1 0 8 0 kstatmem 264 182 0 156 4 2 2 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 35177 0 35177 11 9 2 8 1 8 2 plimitpl 152 450 0 433 1 0 1 1 0 8 0 sigapl 424 2194 0 2146 9 2 7 8 0 8 0 knotepl 120 583 0 0 17 0 17 17 0 8 0 kqueuepl 224 929 0 913 11 8 3 5 0 8 2 pipepl 344 446 0 418 15 11 4 9 0 8 1 fdescpl 528 2152 0 2120 3 0 3 3 0 8 0 filepl 160 14467 0 14105 26 10 16 18 0 8 0 lockfpl 104 783 0 780 2 1 1 2 0 8 0 lockfspl 48 220 0 217 1 0 1 1 0 8 0 sessionpl 144 38 0 30 1 0 1 1 0 8 0 pgrppl 48 80 0 64 1 0 1 1 0 8 0 ucredpl 104 1971 0 1958 1 0 1 1 0 8 0 zombiepl 144 2187 0 2184 2 1 1 1 0 8 0 processpl 1232 2194 0 2146 6 0 6 6 0 8 1 procpl 664 5075 0 5017 8 1 7 8 0 8 0 sosppl 176 22 0 22 3 2 1 1 0 8 1 sockpl 752 3783 0 3622 53 36 17 17 0 8 0 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 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 121 0 0 16 1 15 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 98 0 0 11 0 11 11 0 8 0 mtagpl 96 15 0 0 1 0 1 1 0 8 0 mbufpl 256 1710 0 0 107 0 107 107 0 8 0 bufpl 280 13660 0 7523 439 0 439 439 0 8 0 anonpl 32 12880 0 0 106 2 104 104 0 246 0 amapchunkpl 152 62587 0 61842 52 21 31 38 0 158 1 amappl16 200 6261 0 6162 49 28 21 23 0 8 12 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 9 0 8 1 0 1 1 0 8 0 amappl13 176 513 0 512 1 0 1 1 0 8 0 amappl12 168 2571 0 2530 5 2 3 3 0 8 0 amappl11 160 8 0 8 2 1 1 1 0 8 1 amappl10 152 45 0 31 1 0 1 1 0 8 0 amappl9 144 252 0 252 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 106 0 104 1 0 1 1 0 8 0 amappl6 120 363 0 349 1 0 1 1 0 8 0 amappl5 112 90 0 78 1 0 1 1 0 8 0 amappl4 104 497 0 468 1 0 1 1 0 8 0 amappl3 96 12845 0 12729 5 1 4 4 0 8 0 amappl2 88 663 0 605 2 0 2 2 0 8 0 amappl1 80 18698 0 18121 16 2 14 15 0 8 0 amappl 88 17468 0 17283 5 0 5 5 0 92 0 uvmvnodes 80 168 0 0 4 0 4 4 0 8 0 dma32768 32768 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 2 1 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 20 0 19 1 0 1 1 0 8 0 aobjpl 72 36 0 5 1 0 1 1 0 8 0 uaddrrnd 24 2152 0 2120 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2152 0 2120 1 0 1 1 0 8 0 vmmpekpl 168 19109 0 19061 3 0 3 3 0 8 0 vmmpepl 168 142678 0 140643 134 28 106 106 0 357 7 vmsppl 488 2151 0 2120 6 1 5 5 0 8 0 rwobjpl 80 38563 0 37371 33 1 32 32 0 8 1 pdppl 4096 4328 0 4252 130 52 78 82 0 8 2 pvpl 32 21546 0 0 175 2 173 174 0 265 0 pmappl 256 2159 0 2124 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 441 0 76 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8385bff0) 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:670 comcnputc(800,6e) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6e) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(6e) at cnputc+0x67 sys/dev/cons.c:218 kputchar(6e,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 printf(ffffffff83372839) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80002a35be10,6) at trap_print+0xd8 sys/arch/amd64/amd64/trap.c:660 kerntrap(ffff80002a35be10) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001489000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c424800) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c424800) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 end trace frame: 0xffff80002a35bfb0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8385bff0) 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:670 comcnputc(800,6e) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,6e) at comcnputc+0xd0 sys/dev/ic/com.c:1259 cnputc(6e) at cnputc+0x67 sys/dev/cons.c:218 kputchar(6e,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 printf(ffffffff83372839) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80002a35be10,6) at trap_print+0xd8 sys/arch/amd64/amd64/trap.c:660 kerntrap(ffff80002a35be10) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001489000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c424800) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c424800) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a35bfc0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806bc9a888,81,fffffd80097fd0d0,ffff80003c424800) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd80644472e0,ffff80003c424800) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd80644472e0,ffff80003c424800) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd80644472e0,ffff80003c424800) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd80644472e0,ffff80003c424800) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c424800) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c424800,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c424800,ffff80002a35c330,ffff80002a35c280) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a35c330) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a35c330) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x744542c5ad10, count: -24 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7f13a06b3ff0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f13a06b3ff0, count: -1