*cpu1: uvm_fault(0xfffff4006c55d018, 0x98, 0, 1) -> e ddb{0}> show kasan No such command ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7991768a71f0, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800032b8b170 rbx 0 rdx 0 rcx 0xffff8000383b8550 rax 0x3c r8 0xffff800032b8b0a0 r9 0 r10 0x6603e64f9b2b08f1 r11 0x39d5ec51fbb10469 r12 0 r13 0 r14 0xffff8000383b8550 r15 0 rip 0xffffffff826b93ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800032b8b0f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{0}> show proc PROC (syz-executor) tid=36907 pid=1473 tcnt=2 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000383b94e0,0xffff8000383b8fc0 process=0xffff80002a37f038 user=0xffff800032b86000, vmspace=0xfffff4006c55d5d0 estcpu=36, cpticks=6, pctcpu=0.0, user=3, sys=1, intr=2 ddb{0}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 68805 300624 7962 0 2 0 0 syz-executor 68805 147565 7962 0 3 0 0x4000080 fsleep syz-executor * 1473 36907 58297 0 7 0 0 syz-executor 1473 399523 58297 0 3 0 0x4000080 fsleep syz-executor 91381 86161 16327 0 2 0 0 syz-executor 91381 504064 16327 0 7 0 0x4000000 syz-executor 2938 266329 98344 0 2 0 0 syz-executor 2938 448569 98344 0 3 0 0x4000080 fsleep syz-executor 29800 257667 95375 0 2 0 0 syz-executor 84710 352201 95910 0 3 0x100002 0x80 sbwait arp 95910 521680 36651 0 3 0x100002 0x88 sigsusp sh 58297 148610 40343 0 3 0x2 0x80 nanoslp syz-executor 95375 485974 40343 0 3 0x2 0x80 nanoslp syz-executor 98344 297595 40343 0 3 0x2 0x80 nanoslp syz-executor 36651 365928 40343 0 3 0x2 0x80 wait syz-executor 16327 478260 40343 0 3 0x2 0x80 nanoslp syz-executor 28959 451530 40343 0 3 0x2 0 biowait syz-executor 7962 388736 40343 0 3 0x2 0x80 nanoslp syz-executor 57776 460752 40343 0 3 0x2 0x80 nanoslp syz-executor 40343 497234 1 0 3 0x2 0x80 kqread syz-executor 79660 484467 99733 0 3 0x10 0x88 kqread sshd-session 99733 472303 18483 0 3 0x12 0x80 kqread sshd-session 90303 477934 1 0 3 0x100003 0x80 ttyin getty 18483 14178 1 0 3 0 0x88 kqread sshd 44204 178092 71489 74 3 0x1100012 0x80 bpf pflogd 71489 121629 1 0 3 0 0x80 sbwait pflogd 10166 521281 69286 73 3 0x1100010 0x80 kqread syslogd 69286 328128 1 0 3 0x100002 0x80 sbwait syslogd 63843 316184 1 0 3 0x100000 0x80 kqread resolvd 5745 81584 36792 77 3 0x100012 0x80 kqread dhcpleased 86944 365341 36792 77 3 0x100012 0x80 kqread dhcpleased 36792 496410 1 0 3 0 0x80 kqread dhcpleased 70943 326263 0 0 3 0x14000 0x200 pause smr 67746 156924 0 0 2 0x14000 0x200 zerothread 539 418486 0 0 3 0x14000 0x200 aiodoned aiodoned 77055 432311 0 0 3 0x14000 0x200 syncer update 10203 457187 0 0 3 0x14000 0x200 cleaner cleaner 21550 234292 0 0 3 0x14000 0x200 reaper reaper 42784 27331 0 0 3 0x14000 0x200 pgdaemon pagedaemon 72462 228502 0 0 3 0x14000 0x200 bored viomb 30968 93906 0 0 3 0x14000 0x40000200 acpi0 acpi0 29127 104293 0 0 3 0x14000 0x40000200 idle1 52046 140505 0 0 3 0x14000 0x200 bored softnet1 93051 503519 0 0 3 0x14000 0x200 bored softnet0 80435 76321 0 0 3 0x14000 0x200 smrbar systqmp 83334 85818 0 0 3 0x14000 0x200 bored systq 75972 269212 0 0 3 0x14000 0x200 tmoslp softclockmp 21344 165283 0 0 3 0x14000 0x40000200 tmoslp softclock 39469 350477 0 0 3 0x14000 0x40000200 idle0 1 54211 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &pmap->pm_mtx r = 0 (0xfffff4006c519510) #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+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 1473 (syz-executor) thread 0xffff8000383b8550 (36907) exclusive rwlock uobjlk r = 0 (0xfffff4006d1a3a18) #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_map_protect+0xb36 sys/uvm/uvm_map.c:3202 #3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #5 Xsyscall+0x128 exclusive rwlock vmmaplk r = 0 (0xfffff4006c55d6d0) #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_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170 #3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 exclusive mutex &pmap->pm_mtx r = 0 (0xfffff4006c519510) #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+0x4b4 sys/kern/kern_lock.c:487 #2 pmap_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline] #2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173 #3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline] #3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202 #4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 Process 91381 (syz-executor) thread 0xffff8000383b8fb0 (504064) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a7a440) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 Process 28959 (syz-executor) thread 0xffff80002a222010 (451530) exclusive rrwlock inode r = 0 (0xfffff4006c1c4b30) #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 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150 #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:3063 #10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff4006d15fe98) #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:576 #5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431 #6 namei+0x7c5 sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3048 #8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #9 Xsyscall+0x128 Process 80435 (systqmp) thread 0xffff800045ffef90 (76321) shared rwlock systqmp r = 0 (0xffffffff839acfd8) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11054 12085K 12347K 166960K 12206 0 pcb 19 12K 12K 166960K 35 0 rtable 199 6K 6K 166960K 349 0 pf 33 17K 18K 166960K 49 0 ifaddr 36 6K 7K 166960K 43 0 ifgroup 51 2K 2K 166960K 55 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 70 0 ioctlops 0 0K 4K 166960K 1492 0 iov 0 0K 12K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 82K 166960K 1458 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 4 0K 0K 166960K 5 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 97K 166960K 202 0 sigio 0 0K 0K 166960K 1 0 proc 72 115K 147K 166960K 558 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 7 0 in_multi 77 5K 6K 166960K 93 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 5 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 61 281K 281K 166960K 61 0 exec 0 0K 1K 166960K 391 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 225 169K 186K 166960K 3682 0 UVM aobj 5 2K 2K 166960K 5 0 pinsyscall 43 86K 112K 166960K 1349 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 11 0K 1K 166960K 26 0 temp 37 9114K 9130K 166960K 5339 0 kqueue 13 20K 26K 166960K 44 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 28 0 0 1 0 1 1 0 8 0 rtpcb 120 36 0 31 1 0 1 1 0 8 0 rtentry 176 105 0 17 5 0 5 5 0 8 0 unpcb 144 106 0 87 2 0 2 2 0 8 1 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 29 0 22 1 0 1 1 0 8 0 arp 136 17 0 4 1 0 1 1 0 8 0 inpcb 328 120 0 107 2 0 2 2 0 8 0 nd6 152 22 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 1 1 0 1 1 0 482 0 pffrnode 88 2 0 1 1 0 1 1 0 8 0 pffrent 40 4 0 3 1 0 1 1 0 8 0 pfosfp 40 1429 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1429 0 714 21 0 21 21 0 8 0 pfstitem 24 21 0 0 1 0 1 1 0 8 0 pfstkey 128 23 0 2 1 0 1 1 0 8 0 pfstate 448 22 0 1 3 0 3 3 0 8 0 pfrule 1360 22 0 17 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 447 0 45 26 0 26 26 0 8 0 art_table 40 448 0 45 5 0 5 5 0 8 0 art_node 32 105 0 24 1 0 1 1 0 8 0 semapl 72 2 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1725 0 259 93 0 93 93 0 8 0 ffsino 296 1725 0 259 114 0 114 114 0 8 0 nchpl 144 2033 0 336 64 0 64 64 0 8 0 vnodes 216 1850 0 0 103 0 103 103 0 8 0 namei 1024 6213 0 6212 1 0 1 1 0 8 0 percpumem 16 51 0 1 1 0 1 1 0 8 0 kstatmem 264 27 0 2 2 0 2 2 0 8 0 scsiplug 72 1 0 1 1 0 1 1 0 8 1 scxspl 216 6815 0 6814 4 2 2 3 1 8 1 plimitpl 152 35 0 19 1 0 1 1 0 8 0 sigapl 424 519 0 472 7 0 7 7 0 8 1 knotepl 120 308 0 0 10 0 10 10 0 8 0 kqueuepl 224 43 0 34 1 0 1 1 0 8 0 pipepl 344 129 0 102 3 0 3 3 0 8 0 fdescpl 528 503 0 472 3 0 3 3 0 8 0 filepl 160 2094 0 1872 12 0 12 12 0 8 2 lockfpl 104 72 0 70 1 0 1 1 0 8 0 lockfspl 48 14 0 12 1 0 1 1 0 8 0 sessionpl 144 31 0 20 1 0 1 1 0 8 0 pgrppl 48 42 0 23 1 0 1 1 0 8 0 ucredpl 104 305 0 290 1 0 1 1 0 8 0 zombiepl 144 473 0 472 1 0 1 1 0 8 0 processpl 1232 519 0 472 5 0 5 5 0 8 1 procpl 664 652 0 601 6 0 6 6 0 8 1 sockpl 752 264 0 227 7 0 7 7 0 8 2 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 118 0 0 15 0 15 15 0 8 0 mcl2k 2048 39 0 0 5 0 5 5 0 8 0 mextrefs 64 39 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 267 0 0 17 0 17 17 0 8 0 bufpl 272 2482 0 105 159 0 159 159 0 8 0 anonpl 32 3840 0 0 31 0 31 31 0 247 0 amapchunkpl 152 10473 0 10037 22 0 22 22 0 158 4 amappl16 200 1978 0 1957 5 1 4 5 0 8 1 amappl15 192 6 0 6 1 1 0 1 0 8 0 amappl14 184 448 0 446 1 0 1 1 0 8 0 amappl13 176 129 0 116 1 0 1 1 0 8 0 amappl12 168 747 0 717 2 0 2 2 0 8 0 amappl11 160 11 0 10 1 0 1 1 0 8 0 amappl10 152 75 0 61 1 0 1 1 0 8 0 amappl9 144 272 0 272 1 1 0 1 0 8 0 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 162 0 148 1 0 1 1 0 8 0 amappl6 120 157 0 156 1 0 1 1 0 8 0 amappl5 112 101 0 90 1 0 1 1 0 8 0 amappl4 104 287 0 266 1 0 1 1 0 8 0 amappl3 96 1820 0 1733 3 0 3 3 0 8 0 amappl2 88 642 0 560 2 0 2 2 0 8 0 amappl1 80 10616 0 9997 16 0 16 16 0 8 2 amappl 88 2959 0 2811 5 0 5 5 0 92 0 uvmvnodes 80 100 0 0 3 0 3 3 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 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 4 0 0 1 0 1 1 0 8 0 uaddrrnd 24 503 0 472 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 503 0 472 1 0 1 1 0 8 0 vmmpekpl 168 6183 0 6152 2 0 2 2 0 8 0 vmmpepl 168 41421 0 39535 88 0 88 88 0 357 2 vmsppl 488 502 0 472 5 0 5 5 0 8 0 rwobjpl 80 15296 0 14264 25 0 25 25 0 8 2 pdppl 4096 1013 0 944 99 26 73 87 0 8 4 pvpl 32 10739 0 0 87 0 87 87 0 265 0 pmappl 256 502 0 472 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 434 0 29 12 0 12 12 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7991768a71f0, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff80002999dff0) 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(800,65) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,65) at comcnputc+0x250 sys/dev/ic/com.c:1274 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+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b2741) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff8000383a2e60) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff8000383a2e60) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff8000383a2e60) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff8000383b8fb0,fffff4006c35d8c8,ffff8000383a3020) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff8000383b8fb0,ffff8000383a3170,ffff8000383a30c0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 end trace frame: 0xffff8000383a3160, count: 0 ddb{1}> trace x86_ipi_db(ffff80002999dff0) 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(800,65) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,65) at comcnputc+0x250 sys/dev/ic/com.c:1274 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+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b2741) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff8000383a2e60) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff8000383a2e60) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff8000383a2e60) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff8000383b8fb0,fffff4006c35d8c8,ffff8000383a3020) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff8000383b8fb0,ffff8000383a3170,ffff8000383a30c0) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff8000383a3170) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff8000383a3170) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7fcd0253770, count: -16