*cpu1: uvm_fault(0xfffffd805e25d9b0, 0x0, 0, 1) -> e ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x758a6577c3f0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c43b9c0 rbx 0 rdx 0 rcx 0xffff80002a343a38 rax 0x3a r8 0xffff80003c43b8f0 r9 0x48c7d9ec r10 0x56628293786cf3aa r11 0x543f861fdca75294 r12 0 r13 0 r14 0xffff80002a343a38 r15 0 rip 0xffffffff825c53ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c43b940 ss 0 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=54362 pid=68355 tcnt=3 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a3437a0,0xffff80002a342058 process=0xffff80002a2a7a90 user=0xffff80003c436000, vmspace=0xfffffd805ead57d0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 12086 271058 24109 0 2 0 syz-executor *68355 54362 17992 0 7 0 syz-executor 68355 450271 17992 0 3 0x4000080 fsleep syz-executor 68355 471764 17992 0 2 0x4000000 syz-executor 62425 52843 25637 0 2 0 syz-executor 62425 477764 25637 0 3 0x4000080 fsleep syz-executor 89546 161890 88940 -1 2 0x10 syz-executor 89546 172703 88940 -1 3 0x4000090 fsleep syz-executor 89546 239013 88940 -1 2 0x4000010 syz-executor 89548 178268 25459 0 2 0 syz-executor 89548 123168 25459 0 3 0x4000080 fsleep syz-executor 89548 39590 25459 0 3 0x4000080 fsleep syz-executor 89548 138727 25459 0 3 0x4000080 fsleep syz-executor 24109 472949 75903 0 3 0x82 nanoslp syz-executor 62810 233708 1 0 3 0x100083 ttyin getty 45816 107091 75903 0 3 0x82 nanoslp syz-executor 25459 15304 75903 0 3 0x82 nanoslp syz-executor 25637 75426 75903 0 3 0x82 nanoslp syz-executor 8594 334903 75903 0 3 0x82 wait syz-executor 48618 331791 0 0 3 0x14200 bored sosplice 88940 304391 75903 0 3 0x82 nanoslp syz-executor 17992 487267 75903 0 3 0x82 nanoslp syz-executor 5107 49207 75903 0 3 0x82 nanoslp syz-executor 75903 264466 56545 0 3 0x82 kqread syz-executor 56545 503353 34887 0 3 0x10008a sigsusp ksh 34887 383660 16317 0 3 0x98 kqread sshd-session 16317 132671 81170 0 3 0x92 kqread sshd-session 81170 261669 1 0 3 0x88 kqread sshd 71581 460662 10205 74 3 0x1100092 bpf pflogd 10205 403679 1 0 3 0x80 sbwait pflogd 37949 137698 96922 73 3 0x1100090 kqread syslogd 96922 109170 1 0 3 0x100082 sbwait syslogd 21710 469278 1 0 3 0x100080 kqread resolvd 86060 354715 0 0 3 0x14200 bored smr 87454 183580 0 0 2 0x14200 zerothread 48717 50323 0 0 3 0x14200 aiodoned aiodoned 12189 517357 0 0 3 0x14200 syncer update 59229 298516 0 0 3 0x14200 cleaner cleaner 95028 224505 0 0 2 0x14200 reaper 88723 252871 0 0 3 0x14200 pgdaemon pagedaemon 80237 369331 0 0 3 0x14200 bored viomb 15410 139436 0 0 3 0x40014200 acpi0 acpi0 39959 142393 0 0 3 0x40014200 idle1 88614 8494 0 0 3 0x14200 bored softnet7 91683 417728 0 0 3 0x14200 bored softnet6 67305 409363 0 0 3 0x14200 bored softnet5 16377 190509 0 0 3 0x14200 bored softnet4 72224 382715 0 0 3 0x14200 bored softnet3 41836 411554 0 0 3 0x14200 bored softnet2 78825 472635 0 0 3 0x14200 bored softnet1 86928 219753 0 0 3 0x14200 bored softnet0 12537 368487 0 0 3 0x14200 bored systqmp 41151 216108 0 0 3 0x14200 bored systq 31812 363618 0 0 3 0x14200 tmoslp softclockmp 75735 396889 0 0 3 0x40014200 tmoslp softclock 15626 226702 0 0 3 0x40014200 idle0 1 295698 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806b684310) #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 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #3 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #3 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2770 #4 uvm_fault_lower+0x608 sys/uvm/uvm_fault.c:1542 #5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #7 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #8 recall_trap+0x8 Process 62425 (syz-executor) thread 0xffff80002a3437a0 (52843) exclusive rwlock uobjlk r = 0 (0xfffffd806c6bc3c8) #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 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1236 #3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1370 #4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd805ead56e8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10249 11075K 12472K 166960K 14262 0 pcb 18 20K 23K 166960K 699 0 rtable 234 14K 14K 166960K 924 0 pf 41 19K 67488K 166960K 474 0 ifaddr 41 7K 8K 166960K 210 0 ifgroup 60 2K 3K 166960K 389 0 sysctl 4 1K 9K 166960K 54 0 counters 70 37K 39K 166960K 418 0 ioctlops 0 0K 4K 166960K 2254 0 iov 0 0K 32K 166960K 165 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1482 93K 94K 166960K 3744 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 25 21K 21K 166960K 94 0 dirhash 12 2K 2K 166960K 66 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 106K 166960K 3028 0 sigio 0 0K 0K 166960K 54 0 proc 66 83K 164K 166960K 1046 0 subproc 72 4K 4K 166960K 127 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 358 0 in_multi 76 5K 7K 166960K 278 0 ether_multi 1 0K 0K 166960K 36 0 mrt 1 0K 0K 166960K 28 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 945 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 227 144K 191K 166960K 29638 0 UVM aobj 131 5K 5K 166960K 140 0 pinsyscall 37 74K 101K 166960K 4289 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 195 0 NDP 13 0K 2K 166960K 152 0 temp 146 8653K 8768K 166960K 131540 0 kqueue 7 12K 32K 166960K 611 0 SYN cache 2 8K 16K 166960K 3 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 120 302 0 301 3 2 1 3 0 8 0 rtentry 176 311 0 228 5 0 5 5 0 8 0 unpcb 144 2469 0 2457 19 13 6 6 0 8 5 syncache 336 9 0 9 4 4 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 1006 0 1000 11 7 4 4 0 8 3 arp 128 31 0 18 1 0 1 1 0 8 0 inpcb 328 3819 0 3812 44 39 5 15 0 8 4 nd6 144 43 0 27 1 0 1 1 0 8 0 pkpcb 40 24 0 24 7 6 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 134 0 134 3 2 1 1 0 8 1 pppxif 1504 17 0 17 6 5 1 1 0 8 1 pfstscr 40 11 0 10 1 0 1 1 0 8 0 pffrag 232 53 0 42 1 0 1 1 0 482 0 pffrnode 88 48 0 39 1 0 1 1 0 8 0 pffrent 40 104 0 91 1 0 1 1 0 8 0 pfosfp 40 1430 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1430 0 714 21 0 21 21 0 8 0 pfrktable 1344 3 0 2 1 0 1 1 0 8 0 pfanchor 1288 1 0 0 1 0 1 1 0 8 0 pftag 88 5 0 0 1 0 1 1 0 8 0 pfstitem 24 77 0 58 1 0 1 1 0 8 0 pfstkey 128 87 0 66 2 0 2 2 0 8 0 pfstate 384 80 0 62 6 1 5 6 0 8 0 pfrule 1344 62 0 56 2 1 1 2 0 8 0 rttmr 136 7 0 7 5 4 1 1 0 8 1 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1073 0 702 35 11 24 28 0 8 0 art_table 40 1077 0 702 5 0 5 5 0 8 0 art_node 32 308 0 239 2 1 1 2 0 8 0 sysvmsgpl 40 10 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 77 0 54 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 54 0 37 3 0 3 3 0 8 0 dino2pl 256 7291 0 5776 96 0 96 96 0 8 0 ffsino 296 7291 0 5776 118 0 118 118 0 8 0 nchpl 144 11482 0 10919 64 35 29 64 0 8 4 rtmask 32 36 0 36 5 4 1 1 0 8 1 uvmvnodes 80 7810 0 0 160 0 160 160 0 8 0 vnodes 216 7810 0 0 434 0 434 434 0 8 0 namei 1024 40500 0 40500 8 6 2 3 0 8 2 percpumem 16 224 0 174 1 0 1 1 0 8 0 kstatmem 264 250 0 218 4 1 3 3 0 8 0 acpiwqpl 32 3 0 3 1 0 1 1 1 8 1 scsiplug 72 91 0 91 2 1 1 1 0 8 1 scxspl 216 83894 0 83894 22 20 2 8 1 8 2 plimitpl 152 1014 0 998 1 0 1 1 0 8 0 sigapl 424 3348 0 3296 9 1 8 9 0 8 0 knotepl 120 738 0 0 22 0 22 22 0 8 0 kqueuepl 224 1341 0 1335 15 12 3 9 0 8 2 pipepl 344 496 0 468 15 12 3 9 0 8 0 fdescpl 528 3297 0 3268 3 0 3 3 0 8 0 filepl 160 23607 0 23401 36 18 18 18 0 8 5 lockfpl 104 1587 0 1586 3 1 2 2 0 8 1 lockfspl 48 472 0 471 1 0 1 1 0 8 0 sessionpl 144 36 0 28 1 0 1 1 0 8 0 pgrppl 48 102 0 86 1 0 1 1 0 8 0 ucredpl 104 3811 0 3798 1 0 1 1 0 8 0 zombiepl 144 4115 0 4112 2 1 1 1 0 8 0 processpl 1248 3348 0 3296 6 1 5 6 0 8 0 procpl 664 8323 0 8262 10 2 8 9 0 8 0 sosppl 168 13 0 13 5 4 1 1 0 8 1 sockpl 752 6702 0 6682 74 63 11 21 0 8 8 mcl64k 65536 21 0 0 3 0 3 3 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 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 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 49 0 0 5 0 5 5 0 8 0 mtagpl 96 76 0 0 2 0 2 2 0 8 0 mbufpl 256 390 0 0 25 0 25 25 0 8 0 bufpl 280 34262 0 28119 440 0 440 440 0 8 0 anonpl 32 16099 0 0 130 0 130 130 0 246 0 amapchunkpl 152 103452 0 102901 56 25 31 34 0 158 3 amappl16 200 13002 0 12954 104 85 19 38 0 8 8 amappl15 192 37 0 37 1 1 0 1 0 8 0 amappl14 184 132 0 123 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 4045 0 4015 4 1 3 3 0 8 0 amappl11 160 66 0 58 1 0 1 1 0 8 0 amappl10 152 13 0 12 1 0 1 1 0 8 0 amappl9 144 258 0 257 2 1 1 1 0 8 0 amappl8 136 21 0 18 1 0 1 1 0 8 0 amappl7 128 126 0 117 1 0 1 1 0 8 0 amappl6 120 246 0 242 1 0 1 1 0 8 0 amappl5 112 157 0 149 1 0 1 1 0 8 0 amappl4 104 324 0 304 1 0 1 1 0 8 0 amappl3 96 20901 0 20792 5 1 4 4 0 8 0 amappl2 88 757 0 710 2 0 2 2 0 8 0 amappl1 80 20856 0 20346 15 1 14 15 0 8 0 amappl 88 28314 0 28144 5 0 5 5 0 92 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 9 0 9 4 4 0 1 0 8 0 dma128 128 257 0 257 4 4 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 139 0 9 3 0 3 3 0 8 0 uaddrrnd 24 3297 0 3268 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3297 0 3268 1 0 1 1 0 8 0 vmmpekpl 168 26779 0 26724 3 0 3 3 0 8 0 vmmpepl 168 211000 0 209228 149 29 120 121 0 357 22 vmsppl 488 3296 0 3268 7 2 5 5 0 8 0 rwobjpl 80 63243 0 54483 187 0 187 187 0 8 0 pdppl 4096 6601 0 6536 119 54 65 83 0 8 0 pvpl 32 25458 0 0 206 2 204 204 0 265 0 pmappl 256 3296 0 3268 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 342 0 90 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x758a6577c3f0, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299edff0) 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(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 kputchar(66,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff834159a0) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c422ae0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:626 kerntrap(ffff80003c422ae0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000015b6000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80002a342aa8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a342aa8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80003c422c80, count: 0 ddb{1}> trace x86_ipi_db(ffff8000299edff0) 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(800,66) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1655 [inline] comcnputc(800,66) at comcnputc+0x250 sys/dev/ic/com.c:1269 cnputc(66) at cnputc+0x67 sys/dev/cons.c:218 kputchar(66,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff834159a0) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c422ae0,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:626 kerntrap(ffff80003c422ae0) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:487 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000015b6000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff80002a342aa8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80002a342aa8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c422c90) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8074c90530,81,fffffd80097fb7b8,ffff80002a342aa8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806fbdd6e0,ffff80002a342aa8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806fbdd6e0,ffff80002a342aa8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806fbdd6e0,ffff80002a342aa8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806fbdd6e0,ffff80002a342aa8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a342aa8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a342aa8,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a342aa8,ffff80003c423000,ffff80003c422f50) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c423000) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c423000) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x785caf30ccd0, count: -24