*cpu0: uvm_fault(0xfffff9006cd7e3f0, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x79e9d26c73e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003038b550 rbx 0 rdx 0 rcx 0xffff800045fee7e0 rax 0x2a r8 0xffff80003038b480 r9 0 r10 0x4891a699d65abe60 r11 0x752531cef99fe29 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff829494c7 proc_trampoline+0xc7 cs 0x8 rflags 0x246 rsp 0xffff80003038b4d0 ss 0 proc_trampoline+0xc7: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=507386 pid=35793 tcnt=1 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=0xffff800045fef240,0xffffffff83af29f8 process=0xffff80002a37eb68 user=0xffff800030386000, vmspace=0xfffff9006cd7e020 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *35793 507386 81555 0 7 0 0 syz-executor 41359 480576 140 0 2 0 0 syz-executor 41359 321677 140 0 3 0 0x4000080 fsleep syz-executor 92894 298936 2854 0 2 0 0 syz-executor 92894 361727 2854 0 7 0 0x4000000 syz-executor 94955 480141 98291 0 3 0x100002 0x80 sbwait arp 98291 365392 98707 0 3 0x100002 0x88 sigsusp sh 98707 103949 91984 0 3 0x2 0x80 wait syz-executor 18067 305106 91984 0 2 0x2 0 syz-executor 42131 171497 91984 0 3 0x2 0x80 nanoslp syz-executor 2854 240490 91984 0 3 0x2 0x80 nanoslp syz-executor 99701 444117 91984 0 2 0x2 0 syz-executor 140 156375 91984 0 3 0x2 0x80 nanoslp syz-executor 81555 396131 91984 0 3 0x2 0x80 nanoslp syz-executor 2726 463944 91984 0 3 0x2 0x80 nanoslp syz-executor 91984 163101 20516 0 3 0x2 0x80 kqread syz-executor 20516 18038 53433 0 3 0x100002 0x88 sigsusp ksh 53433 364130 55903 0 3 0x10 0x88 kqread sshd-session 55903 394240 48250 0 3 0x12 0x80 kqread sshd-session 36868 389182 1 0 3 0x100003 0x80 ttyin getty 48250 47019 1 0 3 0 0x88 kqread sshd 87764 96408 21966 74 3 0x1100012 0x80 bpf pflogd 21966 26908 1 0 3 0 0x80 sbwait pflogd 56450 689 56727 73 3 0x1100010 0x80 kqread syslogd 56727 154251 1 0 3 0x100002 0x80 sbwait syslogd 14719 161576 1 0 3 0x100000 0x80 kqread resolvd 89999 417153 12237 77 3 0x100012 0x80 kqread dhcpleased 93897 16198 12237 77 3 0x100012 0x80 kqread dhcpleased 12237 152166 1 0 3 0 0x80 kqread dhcpleased 56002 522288 0 0 3 0x14000 0x200 pause smr 23771 177868 0 0 2 0x14000 0x200 zerothread 40907 435233 0 0 3 0x14000 0x200 aiodoned aiodoned 42151 127955 0 0 3 0x14000 0x200 syncer update 47234 506211 0 0 3 0x14000 0x200 cleaner cleaner 95142 465618 0 0 3 0x14000 0x200 reaper reaper 69456 181632 0 0 3 0x14000 0x200 pgdaemon pagedaemon 92934 374934 0 0 3 0x14000 0x200 bored viomb 3314 243712 0 0 3 0x14000 0x40000200 acpi0 acpi0 20145 97737 0 0 3 0x14000 0x40000200 idle1 89308 138678 0 0 3 0x14000 0x200 bored softnet1 3050 452050 0 0 3 0x14000 0x200 bored softnet0 14378 125573 0 0 3 0x14000 0x200 bored systqmp 66716 521363 0 0 3 0x14000 0x200 bored systq 11851 416732 0 0 3 0x14000 0x200 tmoslp softclockmp 92674 462099 0 0 3 0x14000 0x40000200 tmoslp softclock 62562 225243 0 0 3 0x14000 0x40000200 idle0 1 160121 0 0 3 0x2 0x80 wait init 0 0 -1 0 3 0x10000 0x200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83a55618) #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 uvm_pageactivate+0x15a sys/uvm/uvm_page.c:1270 #3 uvm_fault_upper+0x526 sys/uvm/uvm_fault.c:-1 #4 uvm_fault+0x198 sys/uvm/uvm_fault.c:635 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 35793 (syz-executor) thread 0xffff800045fee7e0 (507386) shared rwlock amaplk r = 0 (0xfffff9006e10f1d0) #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 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffff9006cd7e120) #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:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 exclusive mutex &uvm.pageqlock r = 0 (0xffffffff83a55618) #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 uvm_pageactivate+0x15a sys/uvm/uvm_page.c:1270 #3 uvm_fault_upper+0x526 sys/uvm/uvm_fault.c:-1 #4 uvm_fault+0x198 sys/uvm/uvm_fault.c:635 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640 #7 recall_trap+0x8 Process 92894 (syz-executor) thread 0xffff80003c3d2028 (361727) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a08180) #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 18067 (syz-executor) thread 0xffff800045fee018 (305106) exclusive rrwlock inode r = 0 (0xfffff9006ccd0c58) #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 vget+0x2a2 sys/kern/vfs_subr.c:692 #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+0x963 sys/kern/vfs_lookup.c:580 #11 namei+0x7c5 sys/kern/vfs_lookup.c:250 #12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807 #13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffff9006d83ad70) #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 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807 #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 99701 (syz-executor) thread 0xffff80002a222540 (444117) exclusive rrwlock inode r = 0 (0xfffff9006ccd0b30) #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 (0xfffff9006d83a308) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12090K 12168K 166960K 12165 0 pcb 17 12K 12K 166960K 23 0 rtable 221 6K 6K 166960K 343 0 pf 39 18K 18K 166960K 50 0 ifaddr 43 7K 7K 166960K 45 0 ifgroup 62 2K 2K 166960K 62 0 sysctl 1 1K 9K 166960K 5 0 counters 74 37K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1485 0 iov 0 0K 16K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1294 81K 81K 166960K 1369 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 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 93K 166960K 148 0 proc 71 115K 164K 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 1 0 in_multi 89 6K 6K 166960K 89 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 43 201K 201K 166960K 43 0 exec 0 0K 1K 166960K 395 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 177K 166960K 3182 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 104K 166960K 1335 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 15 0K 1K 166960K 28 0 temp 34 9110K 9117K 166960K 4028 0 kqueue 13 20K 24K 166960K 30 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 28 0 0 1 0 1 1 0 8 0 rtpcb 120 42 0 38 1 0 1 1 0 8 0 rtentry 176 103 0 1 5 0 5 5 0 8 0 unpcb 144 46 0 29 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 12 0 8 1 0 1 1 0 8 0 arp 136 17 0 0 1 0 1 1 0 8 0 inpcb 328 74 0 67 1 0 1 1 0 8 0 nd6 152 21 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 1 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 20 0 0 1 0 1 1 0 8 0 pfstkey 128 20 0 0 1 0 1 1 0 8 0 pfstate 448 20 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 412 0 0 26 0 26 26 0 8 0 art_table 40 413 0 0 5 0 5 5 0 8 0 art_node 32 103 0 10 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1593 0 124 92 0 92 92 0 8 0 ffsino 296 1593 0 124 114 0 114 114 0 8 0 nchpl 144 1808 0 110 64 0 64 64 0 8 0 vnodes 216 1685 0 0 94 0 94 94 0 8 0 namei 1024 5581 0 5580 1 0 1 1 0 8 0 percpumem 16 53 0 0 1 0 1 1 0 8 0 kstatmem 264 31 0 0 3 0 3 3 0 8 0 scxspl 216 6329 0 6329 4 3 1 3 1 8 1 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 477 0 430 7 0 7 7 0 8 0 knotepl 120 56 0 0 2 0 2 2 0 8 0 kqueuepl 224 27 0 18 1 0 1 1 0 8 0 pipepl 344 130 0 103 3 0 3 3 0 8 0 fdescpl 528 461 0 430 3 0 3 3 0 8 0 filepl 160 1665 0 1445 10 0 10 10 0 8 0 lockfpl 104 15 0 13 1 0 1 1 0 8 0 lockfspl 48 8 0 6 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 32 0 15 1 0 1 1 0 8 0 ucredpl 104 99 0 86 1 0 1 1 0 8 0 zombiepl 144 432 0 430 1 0 1 1 0 8 0 processpl 1232 477 0 430 5 0 5 5 0 8 0 procpl 664 512 0 463 6 0 6 6 0 8 0 sockpl 752 162 0 134 4 0 4 4 0 8 1 mcl64k 65536 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 29 0 0 4 0 4 4 0 8 0 mextrefs 64 28 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 210 0 0 14 0 14 14 0 8 0 bufpl 272 2369 0 106 151 0 151 151 0 8 0 anonpl 32 3821 0 0 31 0 31 31 0 247 0 amapchunkpl 152 8663 0 8243 21 0 21 21 0 158 2 amappl16 200 1826 0 1808 5 1 4 5 0 8 2 amappl15 192 48 0 48 1 1 0 1 0 8 0 amappl14 184 439 0 437 1 0 1 1 0 8 0 amappl13 176 200 0 187 1 0 1 1 0 8 0 amappl12 168 716 0 686 2 0 2 2 0 8 0 amappl11 160 11 0 11 1 1 0 1 0 8 0 amappl10 152 67 0 53 1 0 1 1 0 8 0 amappl9 144 276 0 276 1 1 0 1 0 8 0 amappl8 136 140 0 138 1 0 1 1 0 8 0 amappl7 128 152 0 137 1 0 1 1 0 8 0 amappl6 120 155 0 152 1 0 1 1 0 8 0 amappl5 112 103 0 93 1 0 1 1 0 8 0 amappl4 104 297 0 276 1 0 1 1 0 8 0 amappl3 96 1572 0 1473 4 0 4 4 0 8 0 amappl2 88 552 0 493 2 0 2 2 0 8 0 amappl1 80 10662 0 10044 15 0 15 15 0 8 1 amappl 88 2431 0 2284 5 0 5 5 0 92 1 uvmvnodes 80 98 0 0 2 0 2 2 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 128 253 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 461 0 430 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 461 0 430 1 0 1 1 0 8 0 vmmpekpl 168 5871 0 5834 2 0 2 2 0 8 0 vmmpepl 168 39475 0 37627 87 0 87 87 0 357 1 vmsppl 488 460 0 430 5 0 5 5 0 8 0 rwobjpl 80 14899 0 13872 24 0 24 24 0 8 1 pdppl 4096 929 0 860 99 22 77 85 0 8 8 pvpl 32 10332 0 0 84 0 84 84 0 265 0 pmappl 256 460 0 430 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 421 0 24 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff839aaff0) 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(800,3e) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,3e) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(3e) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(3e) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83460996) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83525cda) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c4016d0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c4016d0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c3d2028,fffff9000e93f298,ffff80003c401890) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 end trace frame: 0xffff80003c401900, count: 0 ddb{0}> trace x86_ipi_db(ffffffff839aaff0) 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(800,3e) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,3e) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(3e) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(3e) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff83460996) at db_printf+0x9b sys/kern/subr_prf.c:-1 fault(ffffffff83525cda) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161 kpageflttrap(ffff80003c4016d0,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296 kerntrap(ffff80003c4016d0) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c3d2028,fffff9000e93f298,ffff80003c401890) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff80003c3d2028,ffff80003c4019e0,ffff80003c401930) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff80003c4019e0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4019e0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x97bea09d5b0, count: -17 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: 0x79e9d26c73e0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xc7 end of kernel end trace frame: 0x79e9d26c73e0, count: -1