*cpu0: uvm_fault(0xfffff5806cf339a0, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x76dd9bf65e40, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800033b97f10 rbx 0 rdx 0 rcx 0xffff800045fee018 rax 0x3b r8 0xffff800033b97e40 r9 0 r10 0xf84c732c20a00b07 r11 0x9d86c943fc832d6a r12 0 r13 0 r14 0xffff800045fee018 r15 0 rip 0xffffffff8298a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff800033b97e90 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=458064 pid=97607 tcnt=3 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800045fef240,0xffff800045fefcb0 process=0xffff80002a37e1c8 user=0xffff800033b92000, vmspace=0xfffff5806cf337b8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *97607 458064 15310 0 7 0 0 syz-executor 97607 263879 15310 0 3 0 0x4000080 fsleep syz-executor 97607 482675 15310 0 3 0 0x4000080 fsleep syz-executor 68156 434677 59609 0 3 0 0x80 nanoslp syz-executor 68156 458040 59609 0 3 0 0x4000080 fsleep syz-executor 68156 430577 59609 0 3 0 0x4000080 wsevent_r syz-executor 68156 120255 59609 0 3 0 0x4000080 fsleep syz-executor 98245 388064 78783 0 2 0x10 0 syz-executor 98245 171668 78783 0 3 0x10 0x4000080 fsleep syz-executor 98245 88540 78783 0 3 0x10 0x4000080 fsleep syz-executor 98245 223884 78783 0 3 0x10 0x4000080 fsleep syz-executor 90635 433998 61407 0 2 0 0 syz-executor 90635 446784 61407 0 7 0 0x4000000 syz-executor 79127 234390 69374 0 2 0x100000 0 sh 69374 280123 84635 0 3 0x100002 0x88 sigsusp sh 59471 405069 15580 0 2 0 0 syz-executor 59471 75987 15580 0 2 0 0x4000000 syz-executor 50475 33202 47520 0 2 0 0 syz-executor 50475 151072 47520 0 3 0 0x4000080 kqread syz-executor 50475 208023 47520 0 3 0 0x4000080 fsleep syz-executor 7463 297684 89172 0 2 0x2 0 syz-executor 15580 133009 89172 0 3 0x2 0x80 nanoslp syz-executor 47520 500692 89172 0 3 0x2 0x80 nanoslp syz-executor 61407 78775 89172 0 3 0x2 0x80 nanoslp syz-executor 84635 437691 89172 0 3 0x2 0x80 wait syz-executor 15310 98923 89172 0 3 0x2 0x80 nanoslp syz-executor 59609 346784 89172 0 3 0x2 0x80 nanoslp syz-executor 78783 378028 89172 0 3 0x2 0x80 nanoslp syz-executor 89172 78879 63922 0 3 0x2 0x80 kqread syz-executor 63922 219596 78557 0 3 0x100002 0x88 sigsusp ksh 78557 150129 39142 0 3 0x10 0x88 kqread sshd-session 39142 356832 80745 0 3 0x12 0x80 kqread sshd-session 54415 68871 1 0 3 0x100003 0x80 ttyin getty 80745 97160 1 0 3 0 0x88 kqread sshd 40201 245713 99026 74 3 0x1100012 0x80 bpf pflogd 99026 332681 1 0 3 0 0x80 sbwait pflogd 10178 211625 67697 73 3 0x1100010 0x80 kqread syslogd 67697 46284 1 0 3 0x100002 0x80 sbwait syslogd 70308 293031 1 0 3 0x100000 0x80 kqread resolvd 86112 105857 42890 77 3 0x100012 0x80 kqread dhcpleased 71087 333397 42890 77 3 0x100012 0x80 kqread dhcpleased 42890 48617 1 0 3 0 0x80 kqread dhcpleased 86863 326221 0 0 3 0x14000 0x200 bored smr 90049 356613 0 0 2 0x14000 0x200 zerothread 70459 305468 0 0 3 0x14000 0x200 aiodoned aiodoned 61717 206732 0 0 3 0x14000 0x200 syncer update 87203 98461 0 0 3 0x14000 0x200 cleaner cleaner 90224 395695 0 0 3 0x14000 0x200 reaper reaper 90329 244911 0 0 3 0x14000 0x200 pgdaemon pagedaemon 74597 6260 0 0 3 0x14000 0x200 bored viomb 30714 115742 0 0 3 0x14000 0x40000200 acpi0 acpi0 64482 250947 0 0 3 0x14000 0x40000200 idle1 56030 131484 0 0 3 0x14000 0x200 bored softnet1 82303 86308 0 0 3 0x14000 0x200 bored softnet0 82739 471099 0 0 3 0x14000 0x200 smrbar systqmp 93392 499966 0 0 3 0x14000 0x200 bored systq 13807 24891 0 0 3 0x14000 0x200 tmoslp softclockmp 59325 463574 0 0 3 0x14000 0x40000200 tmoslp softclock 31044 273034 0 0 3 0x14000 0x40000200 idle0 1 211972 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 &pmap->pm_mtx r = 0 (0xfffff5806ccefe10) #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 97607 (syz-executor) thread 0xffff800045fee018 (458064) exclusive rwlock uobjlk r = 0 (0xfffff5806ce892f0) #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 (0xfffff5806cf338b8) #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 (0xfffff5806ccefe10) #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 90635 (syz-executor) thread 0xffff80003bbcb780 (446784) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a23880) #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 7463 (syz-executor) thread 0xffff800045fee548 (297684) exclusive rrwlock inode r = 0 (0xfffff5806cd2aa08) #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 (0xfffff5806d176ea0) #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 82739 (systqmp) thread 0xffff800045ffe000 (471099) shared rwlock systqmp r = 0 (0xffffffff83990c58) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11076 12356K 12356K 166960K 12191 0 pcb 19 13K 13K 166960K 34 0 rtable 238 7K 7K 166960K 373 0 pf 35 17K 18K 166960K 49 0 ifaddr 42 7K 7K 166960K 47 0 ifgroup 55 2K 2K 166960K 60 0 sysctl 1 1K 9K 166960K 6 0 counters 70 37K 37K 166960K 72 0 ioctlops 0 0K 4K 166960K 1551 0 iov 0 0K 4K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1295 81K 81K 166960K 1380 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 3 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 97K 166960K 154 0 proc 70 115K 180K 166960K 555 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 1 0K 0K 166960K 6 0 in_multi 95 6K 6K 166960K 105 0 ether_multi 1 0K 0K 166960K 1 0 mrt 0 0K 0K 166960K 2 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 383 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 240 168K 176K 166960K 3164 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 43 86K 104K 166960K 1307 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 0K 166960K 1 0 NDP 27 2K 2K 166960K 30 0 temp 35 9114K 9120K 166960K 3934 0 kqueue 15 24K 26K 166960K 29 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 34 0 30 1 0 1 1 0 8 0 rtentry 176 115 0 8 5 0 5 5 0 8 0 unpcb 144 53 0 36 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 14 0 7 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 118 0 104 4 0 4 4 0 8 2 nd6 152 24 0 3 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrent 40 1 0 1 1 0 1 1 0 8 1 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 22 0 2 1 0 1 1 0 8 0 pfstate 448 21 0 1 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 476 0 40 30 0 30 30 0 8 1 art_table 40 478 0 40 5 0 5 5 0 8 0 art_node 32 115 0 10 1 0 1 1 0 8 0 semapl 72 1 0 0 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 1597 0 128 92 0 92 92 0 8 0 ffsino 296 1597 0 128 114 0 114 114 0 8 0 nchpl 144 1813 0 111 64 0 64 64 0 8 0 vnodes 216 1698 0 0 95 0 95 95 0 8 0 namei 1024 5542 0 5541 2 0 2 2 0 8 1 percpumem 16 52 0 1 1 0 1 1 0 8 0 kstatmem 264 29 0 2 2 0 2 2 0 8 0 scxspl 216 6550 0 6550 11 3 8 8 1 8 8 plimitpl 152 31 0 12 1 0 1 1 0 8 0 sigapl 424 471 0 423 7 0 7 7 0 8 1 knotepl 120 470 0 0 15 0 15 15 0 8 0 kqueuepl 224 25 0 14 1 0 1 1 0 8 0 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 455 0 423 3 0 3 3 0 8 0 filepl 160 1684 0 1456 11 0 11 11 0 8 0 lockfpl 104 8 0 6 1 0 1 1 0 8 0 lockfspl 48 5 0 3 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 104 106 0 91 1 0 1 1 0 8 0 zombiepl 144 423 0 423 1 0 1 1 0 8 1 processpl 1232 471 0 423 5 0 5 5 0 8 1 procpl 664 505 0 445 6 0 6 6 0 8 0 sockpl 752 206 0 171 8 0 8 8 0 8 4 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 116 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mextrefs 64 25 0 0 1 0 1 1 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 162 0 0 11 0 11 11 0 8 0 bufpl 272 2312 0 105 148 0 148 148 0 8 0 anonpl 32 3819 0 0 31 0 31 31 0 247 0 amapchunkpl 152 8766 0 8257 21 0 21 21 0 158 1 amappl16 200 1898 0 1878 5 0 5 5 0 8 3 amappl15 192 11 0 11 1 0 1 1 0 8 1 amappl14 184 435 0 432 1 0 1 1 0 8 0 amappl13 176 153 0 141 1 0 1 1 0 8 0 amappl12 168 704 0 673 2 0 2 2 0 8 0 amappl11 160 7 0 7 2 1 1 1 0 8 1 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 279 0 278 1 0 1 1 0 8 0 amappl8 136 99 0 97 1 0 1 1 0 8 0 amappl7 128 142 0 129 1 0 1 1 0 8 0 amappl6 120 158 0 154 1 0 1 1 0 8 0 amappl5 112 107 0 95 1 0 1 1 0 8 0 amappl4 104 316 0 297 1 0 1 1 0 8 0 amappl3 96 1544 0 1442 3 0 3 3 0 8 0 amappl2 88 579 0 504 2 0 2 2 0 8 0 amappl1 80 10593 0 9990 14 0 14 14 0 8 0 amappl 88 2445 0 2278 4 0 4 4 0 92 0 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 455 0 423 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 455 0 423 1 0 1 1 0 8 0 vmmpekpl 168 5764 0 5731 2 0 2 2 0 8 0 vmmpepl 168 38890 0 36979 86 0 86 86 0 357 0 vmsppl 488 454 0 423 5 0 5 5 0 8 0 rwobjpl 80 14830 0 13795 23 0 23 23 0 8 0 pdppl 4096 917 0 846 99 12 87 87 0 8 16 pvpl 32 9913 0 0 80 0 80 80 0 265 0 pmappl 256 454 0 423 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 422 0 15 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83909ff0) 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(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b2be0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003afb1720) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003afb1720) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003afb1720) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003bbcb780,fffff5806c685888,ffff80003afb1900) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff80003bbcb780,ffff80003afb1a50,ffff80003afb19a0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 end trace frame: 0xffff80003afb1a40, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83909ff0) 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(800,61) at comcnputc+0x250 comcn_read_reg sys/dev/ic/com.c:1671 [inline] comcnputc(800,61) at comcnputc+0x250 sys/dev/ic/com.c:1274 cnputc(61) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(61) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1 db_printf(ffffffff834b2be0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003afb1720) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff80003afb1720) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003afb1720) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003bbcb780,fffff5806c685888,ffff80003afb1900) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimes(ffff80003bbcb780,ffff80003afb1a50,ffff80003afb19a0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733 syscall(ffff80003afb1a50) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003afb1a50) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7035818160, count: -16 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x76dd9bf65e40, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x76dd9bf65e40, count: -1