*cpu0: uvm_fault(0xfffffd805e9ff5e0, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c267f7b9d40, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2d4ec0 rbx 0 rdx 0 rcx 0xffff80002a262010 rax 0x31 r8 0xffff80002a2d4df0 r9 0xffff80002a2d4be4 r10 0x55bad8b9805c88c5 r11 0xb5785b7c23dcd308 r12 0 r13 0 r14 0xffff80002a262010 r15 0 rip 0xffffffff820c93ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2d4e40 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=434167 pid=58760 tcnt=1 stat=onproc flags process=2 proc=0 runpri=82, usrpri=82, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a262a70,0xffff8000ffffdca0 process=0xffff80002a264010 user=0xffff80002a2cf000, vmspace=0xfffffd806eafdd68 estcpu=32, cpticks=266, pctcpu=1.54, user=3, sys=257, intr=5 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 4525 374392 18013 0 2 0 syz-executor 4525 44691 18013 0 3 0x4000080 kqsel syz-executor 47584 199297 13935 0 2 0xc80 syz-executor 47584 489512 13935 0 2 0x4000c80 syz-executor 47584 429806 13935 0 3 0x4000080 fsleep syz-executor 18013 252986 58760 0 3 0x82 nanoslp syz-executor 16456 484856 61757 0 3 0x3000 suspend syz-executor 16456 470555 61757 0 2 0x4081000 syz-executor 13693 47193 51342 0 3 0x4003000 suspend syz-executor 13693 510818 51342 0 2 0x4081000 syz-executor 4446 112933 0 0 3 0x14200 acct acct 61896 37911 1 0 3 0x100083 ttyin getty 34851 179313 0 0 3 0x14280 nfsidl nfsio 18601 444012 0 0 3 0x14280 nfsidl nfsio 11473 204531 0 0 3 0x14280 nfsidl nfsio 47074 465096 0 0 3 0x14280 nfsidl nfsio 53298 513062 0 0 3 0x14280 nfsidl nfsio 83823 139911 0 0 3 0x14280 nfsidl nfsio 11304 75592 0 0 3 0x14280 nfsidl nfsio 75295 106242 0 0 3 0x14280 nfsidl nfsio 19507 311751 0 0 3 0x14280 nfsidl nfsio 3180 63219 0 0 3 0x14280 nfsidl nfsio 69801 276232 0 0 3 0x14280 nfsidl nfsio 91731 87993 0 0 3 0x14280 nfsidl nfsio 65808 450058 0 0 3 0x14280 nfsidl nfsio 78797 245374 0 0 3 0x14280 nfsidl nfsio 17755 441023 0 0 3 0x14280 nfsidl nfsio 73656 355509 0 0 3 0x14280 nfsidl nfsio 30669 457935 0 0 3 0x14280 nfsidl nfsio 40898 386873 0 0 3 0x14280 nfsidl nfsio 16883 168688 0 0 3 0x14280 nfsidl nfsio 15049 196986 0 0 3 0x14280 nfsidl nfsio 13935 405358 58760 0 2 0xc82 syz-executor 9277 293773 58760 0 3 0x82 wait syz-executor 77734 414176 58760 0 2 0x2 syz-executor 88613 217307 58760 0 2 0xc82 syz-executor 41238 203804 58760 0 3 0x82 wait syz-executor 51342 486588 58760 0 3 0x82 nanoslp syz-executor 61757 167749 58760 0 2 0xc82 syz-executor *58760 434167 36191 0 7 0x2 syz-executor 36191 318833 12749 0 3 0x10008a sigsusp ksh 12749 84578 24621 0 3 0x98 kqread sshd-session 24621 48517 39814 0 3 0x92 kqread sshd-session 39814 117464 1 0 3 0x88 kqread sshd 31426 233968 48485 74 3 0x1100092 bpf pflogd 48485 283196 1 0 3 0x80 sbwait pflogd 5531 463315 90366 73 3 0x1100090 kqread syslogd 90366 38148 1 0 3 0x100082 sbwait syslogd 51497 83484 1 0 3 0x100080 kqread resolvd 88199 272399 4511 77 3 0x100092 kqread dhcpleased 27437 122573 4511 77 3 0x100092 kqread dhcpleased 4511 149049 1 0 3 0x80 kqread dhcpleased 17036 188085 0 0 3 0x14200 bored smr 39494 512311 0 0 3 0x14200 pgzero zerothread 52460 435621 0 0 3 0x14200 aiodoned aiodoned 71188 131109 0 0 3 0x14200 syncer update 5926 515067 0 0 3 0x14200 cleaner cleaner 31004 509465 0 0 3 0x14200 reaper reaper 47423 106114 0 0 3 0x14200 pgdaemon pagedaemon 34487 282921 0 0 3 0x14200 bored viomb 77435 314921 0 0 3 0x40014200 acpi0 acpi0 33066 221455 0 0 3 0x40014200 idle1 97089 519971 0 0 3 0x14200 bored softnet1 7921 277089 0 0 2 0x14200 softnet0 84607 334990 0 0 3 0x14200 bored systqmp 24552 347107 0 0 3 0x14200 bored systq 44143 387569 0 0 3 0x14200 tmoslp softclockmp 46652 120227 0 0 3 0x40014200 tmoslp softclock 80257 201427 0 0 3 0x40014200 idle0 1 321365 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 16456 (syz-executor) thread 0xffff800034fe3a18 (470555) exclusive rrwlock inode r = 0 (0xfffffd8068e0d6a8) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 13693 (syz-executor) thread 0xffff800034fdefd0 (510818) exclusive rrwlock inode r = 0 (0xfffffd8068e0d330) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #7 sys_write+0xa2 sys/kern/sys_generic.c:300 #8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 77734 (syz-executor) thread 0xffff8000ffff2a78 (414176) exclusive rrwlock inode r = 0 (0xfffffd8068e0d0e0) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98 #7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203 #8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478 #9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #11 namei+0x7ca sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806cf6ed90) #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 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1 #6 namei+0x7ca sys/kern/vfs_lookup.c:250 #7 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1868 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 #9 Xsyscall+0x128 Process 58760 (syz-executor) thread 0xffff80002a262010 (434167) exclusive rwlock sbufrcv r = 0 (0xffff800010fdacc0) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 soreceive+0x27d sys/kern/uipc_socket.c:878 #4 soo_read+0x60 sys/kern/sys_socket.c:67 #5 dofilereadv+0x25a sys/kern/sys_generic.c:252 #6 sys_read+0xa2 sys/kern/sys_generic.c:172 #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 11089 12277K 14047K 166960K 13024 0 pcb 18 12K 12K 166960K 102 0 rtable 204 8K 9K 166960K 473 0 pf 33 17K 18K 166960K 82 0 ifaddr 36 6K 7K 166960K 72 0 ifgroup 51 2K 2K 166960K 114 0 sysctl 3 1K 9K 166960K 9 0 counters 68 36K 37K 166960K 124 0 ioctlops 0 0K 4K 166960K 1585 0 iov 0 0K 16K 166960K 18 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1404 88K 89K 166960K 1761 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 89K 166960K 617 0 sigio 0 0K 0K 166960K 11 0 proc 72 115K 164K 166960K 594 0 subproc 72 4K 4K 166960K 82 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 68 0 in_multi 75 5K 7K 166960K 127 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 6 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 456 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 271 173K 183K 166960K 7469 0 UVM aobj 13 6K 8K 166960K 18 0 pinsyscall 42 84K 104K 166960K 1811 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 40 0 NDP 13 0K 2K 166960K 47 0 temp 65 8673K 8738K 166960K 33787 0 kqueue 13 20K 30K 166960K 139 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 72 0 68 1 0 1 1 0 8 0 rtentry 176 137 0 53 6 0 6 6 0 8 0 unpcb 144 274 0 256 1 0 1 1 0 8 0 syncache 336 5 0 5 1 1 0 1 0 8 0 tcpqe 32 1 0 1 1 1 0 1 0 8 0 tcpcb 736 181 0 176 7 6 1 7 0 8 0 arp 136 22 0 5 1 0 1 1 0 8 0 inpcb 328 618 0 608 7 5 2 7 0 8 0 nd6 152 29 0 9 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 9 0 1 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 0 1 1 0 8 1 ppxss 1192 18 0 18 2 1 1 1 0 8 1 pppxif 1504 4 0 4 1 0 1 1 0 8 1 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 4 0 0 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 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 2 0 0 1 0 1 1 0 8 0 pfstate 448 1 0 0 1 0 1 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 580 0 230 29 4 25 29 0 8 2 art_table 40 583 0 230 5 0 5 5 0 8 0 art_node 32 136 0 61 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 11 0 3 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2496 0 984 96 0 96 96 0 8 0 ffsino 296 2496 0 984 117 0 117 117 0 8 0 nchpl 144 3336 0 1628 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 vnodes 216 2801 0 0 156 0 156 156 0 8 0 namei 1024 11309 0 11309 3 2 1 2 0 8 1 percpumem 16 77 0 28 1 0 1 1 0 8 0 vcpupl 3968 3 0 1 1 0 1 1 0 8 0 vmpool 848 4 0 2 1 0 1 1 0 8 0 kstatmem 264 60 0 36 3 1 2 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 216 21013 0 21013 10 2 8 8 1 8 8 plimitpl 152 139 0 119 1 0 1 1 0 8 0 sigapl 424 958 0 890 8 0 8 8 0 8 0 knotepl 120 561 0 0 17 0 17 17 0 8 0 kqueuepl 224 267 0 257 5 2 3 5 0 8 2 pipepl 344 238 0 209 9 6 3 9 0 8 0 fdescpl 528 920 0 889 3 0 3 3 0 8 0 filepl 160 5175 0 4935 20 5 15 16 0 8 4 lockfpl 104 209 0 207 1 0 1 1 0 8 0 lockfspl 48 82 0 80 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 44 0 27 1 0 1 1 0 8 0 ucredpl 104 681 0 668 1 0 1 1 0 8 0 zombiepl 144 895 0 890 1 0 1 1 0 8 0 processpl 1232 958 0 890 6 0 6 6 0 8 0 procpl 664 1790 0 1717 9 1 8 8 0 8 0 sosppl 176 7 0 7 2 1 1 1 0 8 1 sockpl 752 989 0 957 12 7 5 11 0 8 1 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 110 0 0 14 0 14 14 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mtagpl 96 10 0 0 1 0 1 1 0 8 0 mbufpl 256 1172 0 0 74 0 74 74 0 8 0 bufpl 280 8665 0 2529 439 0 439 439 0 8 0 anonpl 32 13433 0 0 109 0 109 109 0 246 0 amapchunkpl 152 24927 0 24249 39 7 32 34 0 158 2 amappl16 200 3802 0 3373 35 12 23 30 0 8 0 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 7 0 7 2 1 1 1 0 8 1 amappl13 176 451 0 448 1 0 1 1 0 8 0 amappl12 168 1299 0 1257 3 0 3 3 0 8 0 amappl11 160 12 0 12 2 2 0 1 0 8 0 amappl10 152 47 0 33 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 25 0 21 1 0 1 1 0 8 0 amappl7 128 86 0 85 1 0 1 1 0 8 0 amappl6 120 305 0 292 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 444 0 415 1 0 1 1 0 8 0 amappl3 96 4109 0 4007 4 1 3 3 0 8 0 amappl2 88 1040 0 963 2 0 2 2 0 8 0 amappl1 80 11373 0 10777 14 1 13 14 0 8 0 amappl 88 6622 0 6431 5 0 5 5 0 92 0 uvmvnodes 80 118 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 0 1 1 0 8 1 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 128 254 0 254 2 2 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 17 0 5 1 0 1 1 0 8 0 uaddrrnd 24 920 0 889 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 920 0 889 1 0 1 1 0 8 0 vmmpekpl 168 9296 0 9254 3 0 3 3 0 8 0 vmmpepl 168 65631 0 63264 109 3 106 109 0 357 0 vmsppl 488 919 0 889 6 1 5 5 0 8 0 rwobjpl 80 20788 0 19296 33 1 32 33 0 8 0 pdppl 4096 1855 0 1784 105 30 75 83 0 8 4 pvpl 32 21578 0 0 175 0 175 175 0 265 0 pmappl 256 923 0 891 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 351 0 46 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83860ff0) 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:682 acpitimer_delay(1) at acpitimer_delay+0xb7 acpitimer_read sys/dev/acpi/acpitimer.c:146 [inline] acpitimer_delay(1) at acpitimer_delay+0xb7 sys/dev/acpi/acpitimer.c:120 comcnputc(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8334f040) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff834115e4) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a7d2130,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a7d2130) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b end trace frame: 0xffff80002a7d2210, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83860ff0) 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:682 acpitimer_delay(1) at acpitimer_delay+0xb7 acpitimer_read sys/dev/acpi/acpitimer.c:146 [inline] acpitimer_delay(1) at acpitimer_delay+0xb7 sys/dev/acpi/acpitimer.c:120 comcnputc(800,20) at comcnputc+0x29b sys/dev/ic/com.c:1269 cnputc(20) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x126 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(65) at db_putchar+0x126 sys/ddb/db_output.c:153 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff8334f040) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff834115e4) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80002a7d2130,0) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80002a7d2130) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000015dc000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff800034fde808) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff800034fde808) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a7d22e0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80729609a0,81,fffffd80097fd618,ffff800034fde808) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8062697420,ffff800034fde808) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8062697420,ffff800034fde808) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8062697420,ffff800034fde808) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8062697420,ffff800034fde808) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800034fde808) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800034fde808,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800034fde808,ffff80002a7d2650,ffff80002a7d25a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a7d2650) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a7d2650) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79f0deec3620, count: -26 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7c267f7b9d40, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c267f7b9d40, count: -1