*cpu0: uvm_fault(0xfffffd8068dc59a8, 0x0, 0, 1) -> e ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x58863e5f190, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c509290 rbx 0 rdx 0 rcx 0xffff80003c458028 rax 0x2a r8 0xffff80003c5091c0 r9 0 r10 0x4f7ff1b4aa679a74 r11 0xbb2bf36f09c00960 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff813a74c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003c509210 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=497405 pid=72585 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4587f0,0xffffffff839534c8 process=0xffff8000390249c0 user=0xffff80003c504000, vmspace=0xfffffd8068dc5b90 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72585 62173 70903 0 3 0x80 fsleep syz-executor 72585 415619 70903 0 3 0x4000080 fsleep syz-executor *72585 497405 70903 0 7 0x4000000 syz-executor 22489 480141 51107 0 3 0x80 nanoslp syz-executor 22489 188568 51107 0 3 0x4000080 rest syz-executor 22489 161769 51107 0 3 0x4000080 bell syz-executor 22489 185784 51107 0 3 0x4000080 fsleep syz-executor 43261 158615 51689 0 3 0x80 nanoslp syz-executor 43261 294816 51689 0 3 0x4000080 nanoslp syz-executor 43261 452815 51689 0 3 0x4000080 fsleep syz-executor 43261 232340 51689 0 3 0x4000080 fsleep syz-executor 99311 319765 0 0 3 0x14280 nfsidl nfsio 72326 506687 0 0 3 0x14280 nfsidl nfsio 62496 49494 0 0 3 0x14280 nfsidl nfsio 33463 431585 0 0 3 0x14280 nfsidl nfsio 15754 260754 0 0 3 0x14280 nfsidl nfsio 66104 128611 0 0 3 0x14280 nfsidl nfsio 25525 5732 0 0 3 0x14280 nfsidl nfsio 85902 178080 0 0 3 0x14280 nfsidl nfsio 1542 498756 0 0 3 0x14280 nfsidl nfsio 37432 386715 0 0 3 0x14280 nfsidl nfsio 51942 157776 0 0 3 0x14280 nfsidl nfsio 35923 473909 0 0 3 0x14280 nfsidl nfsio 76748 232658 0 0 3 0x14280 nfsidl nfsio 18140 430782 0 0 3 0x14280 nfsidl nfsio 93554 170020 0 0 3 0x14280 nfsidl nfsio 19008 171855 0 0 3 0x14280 nfsidl nfsio 45112 167937 0 0 3 0x14280 nfsidl nfsio 95774 36772 0 0 3 0x14280 nfsidl nfsio 80938 254365 0 0 3 0x14280 nfsidl nfsio 98456 265910 0 0 3 0x14280 nfsidl nfsio 12017 475333 0 0 3 0x14200 bored sosplice 55388 407348 8479 0 3 0x82 nanoslp syz-executor 41645 425187 8479 0 2 0x2 syz-executor 51689 392852 8479 0 3 0x82 nanoslp syz-executor 92458 506360 8479 0 3 0x82 nanoslp syz-executor 70903 364578 8479 0 3 0x82 nanoslp syz-executor 51107 458093 8479 0 3 0x82 nanoslp syz-executor 86271 170179 8479 0 3 0x82 nanoslp syz-executor 38361 29853 8479 0 3 0x82 nanoslp syz-executor 8479 386743 32000 0 3 0x82 kqread syz-executor 32000 497951 49070 0 3 0x10008a sigsusp ksh 49070 204254 93923 0 3 0x98 kqread sshd-session 93923 61116 37923 0 3 0x92 kqread sshd-session 88622 58799 1 0 3 0x100083 ttyin getty 37923 127049 1 0 3 0x88 kqread sshd 65362 6128 39949 74 3 0x1100092 bpf pflogd 39949 269903 1 0 3 0x80 sbwait pflogd 11701 413592 89546 73 3 0x1100090 kqread syslogd 89546 193914 1 0 3 0x100082 sbwait syslogd 25581 514621 1 0 3 0x100080 kqread resolvd 66406 302738 3306 77 3 0x100092 kqread dhcpleased 75116 35616 3306 77 3 0x100092 kqread dhcpleased 3306 174086 1 0 3 0x80 kqread dhcpleased 88173 172203 0 0 3 0x14200 bored smr 38834 417187 0 0 3 0x14200 pgzero zerothread 96554 289709 0 0 3 0x14200 aiodoned aiodoned 51189 43943 0 0 3 0x14200 syncer update 32678 120348 0 0 3 0x14200 cleaner cleaner 79661 164396 0 0 3 0x14200 reaper reaper 54575 130359 0 0 3 0x14200 pgdaemon pagedaemon 4963 17405 0 0 3 0x14200 bored viomb 18447 306408 0 0 3 0x40014200 acpi0 acpi0 71069 174507 0 0 3 0x40014200 idle1 85187 146156 0 0 3 0x14200 bored softnet7 45925 244257 0 0 3 0x14200 bored softnet6 51760 241351 0 0 3 0x14200 bored softnet5 4688 276593 0 0 3 0x14200 bored softnet4 10437 277983 0 0 3 0x14200 bored softnet3 27301 368936 0 0 3 0x14200 bored softnet2 42764 281702 0 0 3 0x14200 bored softnet1 54339 493498 0 0 3 0x14200 bored softnet0 29435 165411 0 0 3 0x14200 bored systqmp 67519 185207 0 0 3 0x14200 bored systq 11594 53636 0 0 3 0x14200 tmoslp softclockmp 95785 363150 0 0 3 0x40014200 tmoslp softclock 42260 101275 0 0 3 0x40014200 idle0 1 78378 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8068dc4e10) #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:2767 #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:603 #8 recall_trap+0x8 Process 72585 (syz-executor) thread 0xffff80003c458028 (497405) exclusive rwlock amaplk r = 0 (0xfffffd806c3b5e10) #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_check+0x597 sys/uvm/uvm_fault.c:862 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd8068dc5c90) #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:603 #7 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd8068dc4e10) #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:2767 #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:603 #8 recall_trap+0x8 Process 41645 (syz-executor) thread 0xffff8000ffff2fa0 (425187) exclusive rrwlock inode r = 0 (0xfffffd806bdc8eb8) #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+0xa3 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232 #6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bdc80d8) #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+0xa3 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 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10235 11173K 11174K 166960K 11418 0 pcb 19 12K 12K 166960K 49 0 rtable 193 8K 8K 166960K 288 0 pf 37 18K 18K 166960K 63 0 ifaddr 40 6K 8K 166960K 56 0 ifgroup 59 2K 2K 166960K 80 0 sysctl 3 1K 9K 166960K 9 0 counters 70 37K 37K 166960K 86 0 ioctlops 0 0K 4K 166960K 1504 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1349 85K 85K 166960K 1438 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 5 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 97K 166960K 257 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 180K 166960K 547 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 24 0 in_multi 87 6K 7K 166960K 115 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 67 307K 307K 166960K 67 0 exec 0 0K 1K 166960K 385 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 252 176K 185K 166960K 4146 0 UVM aobj 9 2K 2K 166960K 9 0 pinsyscall 42 84K 104K 166960K 1345 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 43 0 NDP 13 0K 2K 166960K 35 0 temp 46 8648K 8713K 166960K 5692 0 kqueue 13 20K 30K 166960K 53 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 45 0 41 1 0 1 1 0 8 0 rtentry 176 101 0 17 5 0 5 5 0 8 1 unpcb 144 82 0 64 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 51 0 46 1 0 1 1 0 8 0 arp 136 11 0 3 1 0 1 1 0 8 0 inpcb 328 184 0 172 2 0 2 2 0 8 0 nd6 144 18 0 2 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 5 0 5 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 0 1 1 0 8 1 pffrag 232 7 0 1 1 0 1 1 0 482 0 pffrnode 88 6 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 2 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 24 0 0 1 0 1 1 0 8 0 pfstkey 128 26 0 2 1 0 1 1 0 8 0 pfstate 384 25 0 1 3 0 3 3 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 452 0 54 28 0 28 28 0 8 2 art_table 40 453 0 54 5 0 5 5 0 8 0 art_node 32 101 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0 semapl 112 2 0 1 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1794 0 278 96 0 96 96 0 8 1 ffsino 296 1794 0 278 118 0 118 118 0 8 1 nchpl 144 2173 0 1646 64 0 64 64 0 8 39 uvmvnodes 80 1914 0 0 40 0 40 40 0 8 0 vnodes 216 1914 0 0 107 0 107 107 0 8 0 namei 1024 6922 0 6921 2 0 2 2 0 8 1 percpumem 16 58 0 8 1 0 1 1 0 8 0 kstatmem 264 42 0 12 3 0 3 3 0 8 1 scxspl 216 10084 0 10084 3 1 2 2 1 8 2 plimitpl 152 49 0 32 1 0 1 1 0 8 0 sigapl 424 582 0 508 9 0 9 9 0 8 0 knotepl 120 306 0 0 10 0 10 10 0 8 0 kqueuepl 224 64 0 52 1 0 1 1 0 8 0 pipepl 344 113 0 85 3 0 3 3 0 8 0 fdescpl 528 539 0 508 3 0 3 3 0 8 0 filepl 160 2236 0 2002 10 0 10 10 0 8 0 lockfpl 104 45 0 43 1 0 1 1 0 8 0 lockfspl 48 19 0 17 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 33 0 16 1 0 1 1 0 8 0 ucredpl 104 200 0 185 1 0 1 1 0 8 0 zombiepl 144 512 0 508 1 0 1 1 0 8 0 processpl 1232 582 0 508 6 0 6 6 0 8 0 procpl 664 787 0 705 8 0 8 8 0 8 0 sosppl 168 2 0 2 1 0 1 1 0 8 1 sockpl 752 314 0 280 5 0 5 5 0 8 1 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 125 0 0 16 0 16 16 0 8 0 mcl2k 2048 33 0 0 5 0 5 5 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 171 0 0 11 0 11 11 0 8 0 bufpl 280 4468 0 122 311 0 311 311 0 8 0 anonpl 32 7920 0 0 64 0 64 64 0 246 0 amapchunkpl 152 12409 0 11890 29 2 27 27 0 158 6 amappl16 200 2413 0 2390 16 0 16 16 0 8 10 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 114 0 102 1 0 1 1 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 1184 0 1153 4 1 3 3 0 8 0 amappl11 160 53 0 38 1 0 1 1 0 8 0 amappl10 152 6 0 6 1 1 0 1 0 8 0 amappl9 144 262 0 262 2 1 1 1 0 8 1 amappl8 136 24 0 22 1 0 1 1 0 8 0 amappl7 128 105 0 93 1 0 1 1 0 8 0 amappl6 120 175 0 172 1 0 1 1 0 8 0 amappl5 112 141 0 132 1 0 1 1 0 8 0 amappl4 104 313 0 294 1 0 1 1 0 8 0 amappl3 96 1950 0 1849 3 0 3 3 0 8 0 amappl2 88 785 0 704 2 0 2 2 0 8 0 amappl1 80 9028 0 8435 15 0 15 15 0 8 1 amappl 88 3452 0 3274 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 539 0 508 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 539 0 508 1 0 1 1 0 8 0 vmmpekpl 168 6146 0 6108 2 0 2 2 0 8 0 vmmpepl 168 41365 0 39398 105 0 105 105 0 357 8 vmsppl 488 538 0 508 5 0 5 5 0 8 0 rwobjpl 80 16479 0 13628 65 1 64 64 0 8 0 pdppl 4096 1086 0 1016 100 26 74 88 0 8 4 pvpl 32 16038 0 0 132 1 131 131 0 265 1 pmappl 256 538 0 508 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 272 0 28 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8379dff0) 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_write_1(3f8,0,65) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:782 comcnputc(800,65) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,65) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fd113) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002ebfac50) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002ebfac50) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002ebfac50) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148c000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff8000390202d0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000390202d0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 end trace frame: 0xffff80002ebfadf0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8379dff0) 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_write_1(3f8,0,65) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:782 comcnputc(800,65) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,65) at comcnputc+0x1ab sys/dev/ic/com.c:1263 cnputc(65) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(65) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x203 sys/kern/subr_prf.c:723 db_printf(ffffffff833fd113) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80002ebfac50) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80002ebfac50) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80002ebfac50) at kerntrap+0x23e sys/arch/amd64/amd64/trap.c:480 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148c000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff8000390202d0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000390202d0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002ebfae00) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8064da90e0,81,fffffd80097fb478,ffff8000390202d0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806649fe08,ffff8000390202d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806649fe08,ffff8000390202d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806649fe08,ffff8000390202d0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806649fe08,ffff8000390202d0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000390202d0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000390202d0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000390202d0,ffff80002ebfb170,ffff80002ebfb0c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ebfb170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebfb170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7048fcc5c530, count: -24 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688 proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x58863e5f190, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x58863e5f190, count: -1