*cpu0: uvm_fault(0xfffffd806c34e028, 0x340, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x72175cb5b470, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003b80ae30 rbx 0 rdx 0 rcx 0xffff8000333dc2b8 rax 0x3c r8 0xffff80003b80ad60 r9 0x1 r10 0x86c401c1733a1ed r11 0xe08fbab8cb0cef1 r12 0 r13 0 r14 0xffff8000333dc2b8 r15 0 rip 0xffffffff8220b3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003b80adb0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=357675 pid=41952 tcnt=3 stat=onproc flags process=0 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000367e0d20,0xffff8000367e0a98 process=0xffff8000ffff1cf8 user=0xffff80003b805000, vmspace=0xfffffd806c34e9b0 estcpu=36, cpticks=5, pctcpu=0.0, user=4, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60621 273413 19720 0 2 0 syz-executor 60621 193575 19720 0 3 0x4000000 vm_terminate syz-executor 60621 170704 19720 0 7 0x4000000 syz-executor *41952 357675 44308 0 7 0 syz-executor 41952 447399 44308 0 3 0x4000080 fsleep syz-executor 41952 445685 44308 0 3 0x4000080 fsleep syz-executor 38518 173651 15273 0 3 0x80 nanoslp syz-executor 38518 322132 15273 0 3 0x4000080 lockf syz-executor 38518 210217 15273 0 3 0x4000080 fsleep syz-executor 53172 355756 22260 0 3 0x80 nanoslp syz-executor 53172 350480 22260 0 3 0x4000080 lockf syz-executor 53172 291495 22260 0 3 0x4000080 fsleep syz-executor 53172 368661 22260 0 3 0x4000080 fsleep syz-executor 67826 120847 37004 60929 3 0x90 nanoslp syz-executor 67826 26794 37004 60929 3 0x4000090 kqsel syz-executor 67826 384362 37004 60929 3 0x4000090 fsleep syz-executor 37004 393414 52979 0 3 0x82 nanoslp syz-executor 7113 173334 0 0 3 0x14200 acct acct 44524 277237 52979 0 3 0x82 wait syz-executor 15273 300577 52979 0 3 0x82 nanoslp syz-executor 22110 116259 52979 0 3 0x82 nanoslp syz-executor 27405 392516 52979 0 3 0x82 wait syz-executor 19720 240749 52979 0 3 0x82 nanoslp syz-executor 22260 321622 52979 0 3 0x82 nanoslp syz-executor 44308 429428 52979 0 3 0x82 nanoslp syz-executor 52979 171059 51211 0 3 0x82 kqread syz-executor 51211 396548 47570 0 3 0x10008a sigsusp ksh 47570 420699 93297 0 3 0x98 kqread sshd-session 93297 451554 73951 0 3 0x92 kqread sshd-session 66143 105599 1 0 3 0x100083 ttyopn getty 73951 157898 1 0 3 0x88 kqread sshd 60870 298418 62655 74 3 0x1100092 bpf pflogd 62655 485276 1 0 3 0x80 sbwait pflogd 27904 399196 63129 73 3 0x1100090 kqread syslogd 63129 161034 1 0 3 0x100082 sbwait syslogd 58866 424858 1 0 3 0x100080 kqread resolvd 18964 495526 10806 77 3 0x100092 kqread dhcpleased 33010 514100 10806 77 3 0x100092 kqread dhcpleased 10806 20875 1 0 3 0x80 kqread dhcpleased 72529 30554 0 0 3 0x14200 bored smr 64758 81324 0 0 3 0x14200 pgzero zerothread 16822 97226 0 0 3 0x14200 aiodoned aiodoned 53411 276587 0 0 3 0x14200 syncer update 82375 237476 0 0 3 0x14200 cleaner cleaner 39862 292015 0 0 3 0x14200 reaper reaper 86917 518160 0 0 3 0x14200 pgdaemon pagedaemon 1672 315380 0 0 3 0x14200 bored viomb 70536 399171 0 0 3 0x40014200 acpi0 acpi0 44794 419705 0 0 3 0x40014200 idle1 53812 353128 0 0 3 0x14200 bored softnet1 36579 179231 0 0 3 0x14200 bored softnet0 90284 420313 0 0 3 0x14200 bored systqmp 45025 455076 0 0 3 0x14200 bored systq 49289 6165 0 0 3 0x14200 tmoslp softclockmp 90986 248787 0 0 3 0x40014200 tmoslp softclock 38980 281624 0 0 3 0x40014200 idle0 1 501173 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 (0xffffffff8397e810) #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 sleep_finish+0x1d6 sys/kern/kern_synch.c:357 #4 refcnt_finalize+0xdb sys/kern/kern_synch.c:957 #5 vm_terminate+0x16d sys/dev/vmm/vmm.c:739 #6 vmmioctl+0x35b sys/dev/vmm/vmm.c:254 #7 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #8 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #9 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #11 Xsyscall+0x128 Process 60621 (syz-executor) thread 0xffff8000367e1cb0 (170704) exclusive rwlock vm_list r = 0 (0xffff800000afc8e0) #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 vm_terminate+0x88 sys/dev/vmm/vmm.c:728 #3 vmmioctl+0x35b sys/dev/vmm/vmm.c:254 #4 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10237 11038K 11829K 166960K 13112 0 pcb 18 18K 20K 166960K 706 0 rtable 234 12K 13K 166960K 949 0 pf 42 19K 82K 166960K 321 0 ifaddr 41 7K 9K 166960K 194 0 ifgroup 62 2K 3K 166960K 344 0 sysctl 4 1K 9K 166960K 34 0 counters 72 37K 38K 166960K 376 0 ioctlops 0 0K 4K 166960K 2160 0 iov 0 0K 28K 166960K 261 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1455 91K 92K 166960K 3581 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 5K 166960K 29 0 VM map 2 1K 1K 166960K 2 0 sem 13 0K 0K 166960K 234 0 dirhash 12 2K 2K 166960K 51 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 179K 236K 166960K 2792 0 sigio 0 0K 0K 166960K 88 0 proc 72 115K 148K 166960K 1000 0 subproc 72 4K 4K 166960K 135 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 297 0 in_multi 77 5K 7K 166960K 284 0 ether_multi 1 0K 0K 166960K 27 0 mrt 2 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 259 1155K 1155K 166960K 259 0 exec 0 0K 1K 166960K 1074 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 6 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 263 153K 169K 166960K 26704 0 UVM aobj 76 27K 27K 166960K 80 0 pinsyscall 43 86K 102K 166960K 4081 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 166 0 NDP 13 0K 2K 166960K 146 0 temp 88 8676K 8749K 166960K 146947 0 kqueue 15 24K 33K 166960K 564 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 120 319 0 316 4 3 1 3 0 8 0 rtentry 176 267 0 177 6 0 6 6 0 8 0 unpcb 144 2071 0 2050 9 8 1 6 0 8 0 syncache 336 10 0 10 4 4 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 968 0 962 15 13 2 7 0 8 1 arp 136 44 0 26 1 0 1 1 0 8 0 inpcb 328 3275 0 3261 19 12 7 12 0 8 5 nd6 152 53 0 32 2 0 2 2 0 8 0 pkpcb 40 12 0 12 3 2 1 1 0 8 1 kcovpl 48 15 0 7 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 121 0 121 2 1 1 1 0 8 1 pppxif 1504 12 0 12 4 3 1 1 0 8 1 pfstscr 40 5 0 5 3 3 0 1 0 8 0 pffrag 232 28 0 14 1 0 1 1 0 482 0 pffrnode 88 27 0 14 1 0 1 1 0 8 0 pffrent 40 58 0 44 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 8 0 8 3 2 1 1 0 8 1 pftag 88 2 0 0 1 0 1 1 0 8 0 pfstitem 24 159 0 50 1 0 1 1 0 8 0 pfstkey 128 165 0 56 4 0 4 4 0 8 0 pfstate 448 163 0 54 13 0 13 13 0 8 0 pfrule 1344 31 0 26 2 1 1 2 0 8 0 rttmr 136 5 0 5 4 4 0 1 0 8 0 art_heap8 4096 4 0 0 4 0 4 4 0 8 0 art_heap4 256 1093 0 739 36 7 29 31 0 8 0 art_table 40 1097 0 739 5 0 5 5 0 8 0 art_node 32 264 0 184 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 2 1 1 1 0 8 0 semupl 112 7 0 7 5 5 0 1 0 8 0 semapl 112 226 0 215 1 0 1 1 0 8 0 shmpl 112 66 0 2 2 0 2 2 0 8 0 dirhash 1024 43 0 26 3 0 3 3 0 8 0 dino2pl 256 6847 0 5326 96 0 96 96 0 8 0 ffsino 296 6847 0 5326 118 0 118 118 0 8 0 nchpl 144 10758 0 9027 65 0 65 65 0 8 0 rtmask 32 26 0 26 3 2 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 38829 0 38829 3 2 1 2 0 8 1 percpumem 16 203 0 152 1 0 1 1 0 8 0 vcpupl 3968 10 0 1 2 0 2 2 0 8 0 vmpool 840 11 0 2 1 0 1 1 0 8 0 kstatmem 264 230 0 200 4 1 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 19 0 19 4 3 1 1 0 8 1 scxspl 216 67498 0 67498 14 12 2 8 1 8 2 plimitpl 152 926 0 907 1 0 1 1 0 8 0 sigapl 424 3053 0 3004 7 1 6 7 0 8 0 knotepl 120 765 0 0 23 0 23 23 0 8 0 kqueuepl 224 1124 0 1111 9 7 2 5 0 8 1 pipepl 344 751 0 723 13 10 3 9 0 8 0 fdescpl 528 3035 0 3003 3 0 3 3 0 8 0 filepl 160 23336 0 23088 32 19 13 21 0 8 1 lockfpl 104 1344 0 1335 2 1 1 2 0 8 0 lockfspl 48 434 0 429 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 121 0 104 1 0 1 1 0 8 0 ucredpl 104 4201 0 4187 1 0 1 1 0 8 0 zombiepl 144 3007 0 3004 1 0 1 1 0 8 0 processpl 1232 3053 0 3004 5 1 4 5 0 8 0 procpl 664 7453 0 7393 6 0 6 6 0 8 0 sosppl 176 18 0 18 4 3 1 1 0 8 1 sockpl 752 5759 0 5720 46 36 10 24 0 8 5 mcl64k 65536 19 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 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k 2048 94 0 0 9 0 9 9 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 347 0 0 22 0 22 22 0 8 0 bufpl 280 26636 0 20500 439 0 439 439 0 8 0 anonpl 32 12984 0 0 105 0 105 105 0 246 0 amapchunkpl 152 92761 0 92205 47 17 30 35 0 158 6 amappl16 200 10231 0 10190 67 49 18 31 0 8 8 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 3 0 3 1 1 0 1 0 8 0 amappl13 176 512 0 511 1 0 1 1 0 8 0 amappl12 168 3448 0 3404 4 1 3 3 0 8 0 amappl11 160 9 0 9 1 1 0 1 0 8 0 amappl10 152 63 0 48 1 0 1 1 0 8 0 amappl9 144 256 0 256 1 1 0 1 0 8 0 amappl8 136 45 0 42 1 0 1 1 0 8 0 amappl7 128 107 0 105 1 0 1 1 0 8 0 amappl6 120 368 0 354 1 0 1 1 0 8 0 amappl5 112 76 0 65 1 0 1 1 0 8 0 amappl4 104 476 0 445 1 0 1 1 0 8 0 amappl3 96 16151 0 16047 4 1 3 3 0 8 0 amappl2 88 3155 0 3075 2 0 2 2 0 8 0 amappl1 80 21240 0 20638 14 0 14 14 0 8 0 amappl 88 25382 0 25198 5 0 5 5 0 92 0 uvmvnodes 80 196 0 0 4 0 4 4 0 8 0 dma65536 65536 4 0 4 2 2 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 7 0 7 2 1 1 1 0 8 1 dma128 128 260 0 260 3 2 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 20 0 19 1 0 1 1 0 8 0 aobjpl 72 79 0 4 2 0 2 2 0 8 0 uaddrrnd 24 3035 0 3003 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3035 0 3003 1 0 1 1 0 8 0 vmmpekpl 168 24748 0 24700 3 0 3 3 0 8 0 vmmpepl 168 195001 0 192966 133 25 108 113 0 357 8 vmsppl 488 3034 0 3003 6 1 5 5 0 8 0 rwobjpl 80 50509 0 49262 40 6 34 36 0 8 0 pdppl 4096 6100 0 6019 121 38 83 84 0 8 2 pvpl 32 21170 0 0 170 0 170 170 0 265 0 pmappl 256 3045 0 3005 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 358 0 69 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d9ff0) 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 __mp_lock(ffffffff838b8528) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b8528) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 cnputc(70) at cnputc+0x67 sys/dev/cons.c:218 kputchar(70,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83457e14) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c46b520,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:653 kerntrap(ffff80003c46b520) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b end trace frame: 0xffff80003c46b620, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837d9ff0) 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 __mp_lock(ffffffff838b8528) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b8528) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 cnputc(70) at cnputc+0x67 sys/dev/cons.c:218 kputchar(70,5,0) at kputchar+0x2ed sys/kern/subr_prf.c:367 kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1 printf(ffffffff83457e14) at printf+0x8b sys/kern/subr_prf.c:529 trap_print(ffff80003c46b520,6) at trap_print+0x70 sys/arch/amd64/amd64/trap.c:653 kerntrap(ffff80003c46b520) at kerntrap+0x2e6 sys/arch/amd64/amd64/trap.c:516 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b vm_terminate(ffff80003c46b870) at vm_terminate+0xb0 sys/dev/vmm/vmm.c:728 vmmioctl(a00,80045604,ffff80003c46b870,1,ffff8000367e1cb0) at vmmioctl+0x35b sys/dev/vmm/vmm.c:254 VOP_IOCTL(fffffd806e931d88,80045604,ffff80003c46b870,1,fffffd80097fd4e0,ffff8000367e1cb0) at VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 vn_ioctl(fffffd8060590810,80045604,ffff80003c46b870,ffff8000367e1cb0) at vn_ioctl+0xf8 sys/kern/vfs_vnops.c:531 sys_ioctl(ffff8000367e1cb0,ffff80003c46ba50,ffff80003c46b9a0) at sys_ioctl+0x674 sys/kern/sys_generic.c:-1 syscall(ffff80003c46ba50) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c46ba50) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x47e8ea699e0, count: -21 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x72175cb5b470, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x72175cb5b470, count: -1