*cpu0: uvm_fault(0xfffff7006fb881f0, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x790ebc107700, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c3f5420 rbx 0 rdx 0 rcx 0xffff80003afb9a10 rax 0x3b r8 0xffff80003c3f5350 r9 0 r10 0x19e34b0708b57666 r11 0xc2bf529fb341f8c2 r12 0 r13 0 r14 0xffff80003afb9a10 r15 0 rip 0xffffffff8140b3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c3f53a0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=264929 pid=13251 tcnt=3 stat=onproc flags process=10 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003afb82b8,0xffff800045fee2c0 process=0xffff80003afbc9c0 user=0xffff80003c3f0000, vmspace=0xfffff7006fb881f0 estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND *13251 264929 9560 -1 7 0x10 0 syz-executor 13251 178269 9560 -1 7 0x10 0x4000000 syz-executor 13251 399515 9560 -1 3 0x10 0x4000080 fsleep syz-executor 91346 182367 22599 0 2 0 0 syz-executor 91346 272561 22599 0 3 0 0x4000080 kqpoll syz-executor 4018 417849 31815 0 3 0x1000 0x2000 suspend syz-executor 4018 133313 31815 0 2 0x1000 0x4080000 syz-executor 85722 311488 57723 0 2 0 0 syz-executor 85722 347815 57723 0 2 0 0x4000000 syz-executor 67412 521553 96411 0 2 0 0 syz-executor 67412 143844 96411 0 3 0 0x4000080 fsleep syz-executor 96909 219318 73693 0 3 0 0x80 nanoslp syz-executor 96909 22212 73693 0 3 0 0x4000080 sbwait syz-executor 96909 77843 73693 0 3 0 0x4000080 fsleep syz-executor 96909 114484 73693 0 3 0 0x4000080 fsleep syz-executor 37789 232467 20382 0 3 0 0x80 nanoslp syz-executor 37789 206873 20382 0 3 0 0x4000080 netcon syz-executor 37789 370691 20382 0 3 0 0x4000080 fsleep syz-executor 73693 472922 79792 0 2 0x2 0 syz-executor 69719 147823 79792 0 2 0x2 0 syz-executor 31815 132140 79792 0 3 0x2 0x80 nanoslp syz-executor 96411 216753 79792 0 2 0x2 0 syz-executor 57723 345743 79792 0 3 0x2 0x80 nanoslp syz-executor 20382 111355 79792 0 3 0x2 0x80 nanoslp syz-executor 22599 292494 79792 0 3 0x2 0x80 nanoslp syz-executor 9560 265616 79792 0 3 0x2 0x80 nanoslp syz-executor 79792 356645 61210 0 3 0x2 0x80 kqread syz-executor 61210 68415 61952 0 3 0x100002 0x88 sigsusp ksh 61952 197802 35981 0 3 0x10 0x88 kqread sshd-session 35981 314427 23646 0 3 0x12 0x80 kqread sshd-session 11339 339178 1 0 3 0x100003 0x80 ttyin getty 23646 128790 1 0 3 0 0x88 kqread sshd 40634 301794 40591 74 3 0x1100012 0x80 bpf pflogd 40591 178079 1 0 3 0 0x80 sbwait pflogd 5885 309733 47127 73 3 0x1100010 0x80 kqread syslogd 47127 212566 1 0 3 0x100002 0x80 sbwait syslogd 47428 206802 1 0 3 0x100000 0x80 kqread resolvd 95743 242490 41027 77 3 0x100012 0x80 kqread dhcpleased 53290 22492 41027 77 3 0x100012 0x80 kqread dhcpleased 41027 493484 1 0 3 0 0x80 kqread dhcpleased 7052 468174 0 0 3 0x14000 0x200 bored smr 1346 36370 0 0 2 0x14000 0x200 zerothread 96016 418069 0 0 3 0x14000 0x200 aiodoned aiodoned 89976 228803 0 0 3 0x14000 0x200 syncer update 15812 127142 0 0 3 0x14000 0x200 cleaner cleaner 69974 49264 0 0 3 0x14000 0x200 reaper reaper 14013 54648 0 0 3 0x14000 0x200 pgdaemon pagedaemon 42574 228651 0 0 3 0x14000 0x200 bored viomb 69487 388447 0 0 3 0x14000 0x40000200 acpi0 acpi0 45631 41093 0 0 3 0x14000 0x40000200 idle1 54428 154487 0 0 3 0x14000 0x200 bored softnet1 44213 92540 0 0 2 0x14000 0x200 softnet0 94476 437292 0 0 3 0x14000 0x200 smrbar systqmp 45192 277064 0 0 3 0x14000 0x200 bored systq 41308 383663 0 0 3 0x14000 0x200 tmoslp softclockmp 84465 94784 0 0 3 0x14000 0x40000200 tmoslp softclock 88898 96826 0 0 3 0x14000 0x40000200 idle0 1 219191 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 (0xfffff7006ccfbe10) #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 13251 (syz-executor) thread 0xffff80003afb9a10 (264929) exclusive rwlock uobjlk r = 0 (0xfffff70070986ef8) #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 (0xfffff7006fb882f0) #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 (0xfffff7006ccfbe10) #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 13251 (syz-executor) thread 0xffff800045fee2b0 (178269) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff839f8700) #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 69719 (syz-executor) thread 0xffff800045feed10 (147823) exclusive rrwlock inode r = 0 (0xfffff7006f68b808) #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 (0xfffff7006dd8fd70) #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 94476 (systqmp) thread 0xffff800045ffea60 (437292) shared rwlock systqmp r = 0 (0xffffffff83991e98) #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 11066 12286K 12408K 166960K 12243 0 pcb 17 12K 12K 166960K 37 0 rtable 217 6K 7K 166960K 369 0 pf 34 17K 21K 166960K 56 0 ifaddr 39 6K 7K 166960K 47 0 ifgroup 51 2K 2K 166960K 59 0 sysctl 1 1K 9K 166960K 6 0 counters 68 36K 37K 166960K 74 0 ioctlops 0 0K 4K 166960K 1502 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1321 83K 83K 166960K 1450 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 6 0K 0K 166960K 7 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 61K 89K 166960K 202 0 sigio 0 0K 0K 166960K 1 0 proc 71 115K 164K 166960K 556 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 16 0 in_multi 88 5K 6K 166960K 105 0 ether_multi 1 0K 0K 166960K 6 0 mrt 0 0K 0K 166960K 7 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 55 254K 254K 166960K 55 0 exec 0 0K 1K 166960K 392 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 238 159K 168K 166960K 3657 0 UVM aobj 6 2K 2K 166960K 6 0 pinsyscall 42 84K 104K 166960K 1358 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 11 0K 2K 166960K 30 0 temp 37 9114K 9178K 166960K 4092 0 kqueue 13 20K 26K 166960K 34 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 38 0 34 1 0 1 1 0 8 0 rtentry 176 118 0 18 6 0 6 6 0 8 0 unpcb 144 150 0 127 4 0 4 4 0 8 3 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 736 23 0 16 1 0 1 1 0 8 0 arp 136 21 0 4 1 0 1 1 0 8 0 inpcb 328 124 0 113 2 0 2 2 0 8 1 nd6 152 24 0 3 1 0 1 1 0 8 0 pkpcb 40 5 0 4 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 2 0 2 1 0 1 1 0 8 1 pfstscr 40 2 0 2 1 0 1 1 0 8 1 pffrag 232 2 0 0 1 0 1 1 0 482 0 pffrnode 88 2 0 0 1 0 1 1 0 8 0 pffrent 40 2 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 pfsrclim 320 1 0 0 1 0 1 1 0 8 0 pfstitem 24 26 0 0 1 0 1 1 0 8 0 pfstkey 128 29 0 3 1 0 1 1 0 8 0 pfstate 448 28 0 2 3 0 3 3 0 8 0 pfrule 1360 24 0 19 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 458 0 5 29 0 29 29 0 8 0 art_table 40 459 0 5 5 0 5 5 0 8 0 art_node 32 118 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 5 0 1 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1676 0 211 93 0 93 93 0 8 0 ffsino 296 1676 0 211 114 0 114 114 0 8 0 nchpl 144 1974 0 273 64 0 64 64 0 8 0 vnodes 216 1834 0 0 102 0 102 102 0 8 0 namei 1024 6041 0 6040 1 0 1 1 0 8 0 percpumem 16 53 0 3 1 0 1 1 0 8 0 kstatmem 264 31 0 6 2 0 2 2 0 8 0 scxspl 216 6562 0 6562 3 2 1 2 1 8 1 plimitpl 152 35 0 17 1 0 1 1 0 8 0 sigapl 424 519 0 472 7 0 7 7 0 8 1 knotepl 120 511 0 0 16 0 16 16 0 8 0 kqueuepl 224 36 0 26 1 0 1 1 0 8 0 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 503 0 472 3 0 3 3 0 8 0 filepl 160 2021 0 1788 12 0 12 12 0 8 2 lockfpl 104 73 0 70 1 0 1 1 0 8 0 lockfspl 48 21 0 18 1 0 1 1 0 8 0 sessionpl 144 26 0 17 1 0 1 1 0 8 0 pgrppl 48 34 0 17 1 0 1 1 0 8 0 ucredpl 104 151 0 137 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 0 procpl 664 638 0 580 6 0 6 6 0 8 0 sockpl 752 317 0 278 10 0 10 10 0 8 6 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 117 0 0 15 0 15 15 0 8 0 mcl2k 2048 32 0 0 4 0 4 4 0 8 0 mextrefs 64 31 0 0 1 0 1 1 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 182 0 0 12 0 12 12 0 8 0 bufpl 272 2372 0 105 152 0 152 152 0 8 0 anonpl 32 5467 0 0 45 0 45 45 0 247 0 amapchunkpl 152 10229 0 9726 26 0 26 26 0 158 5 amappl16 200 1731 0 1706 5 0 5 5 0 8 3 amappl15 192 5 0 5 2 1 1 1 0 8 1 amappl14 184 431 0 430 1 0 1 1 0 8 0 amappl13 176 124 0 112 1 0 1 1 0 8 0 amappl12 168 762 0 732 2 0 2 2 0 8 0 amappl11 160 13 0 13 2 1 1 1 0 8 1 amappl10 152 104 0 90 1 0 1 1 0 8 0 amappl9 144 279 0 279 1 0 1 1 0 8 1 amappl8 136 103 0 101 1 0 1 1 0 8 0 amappl7 128 159 0 146 1 0 1 1 0 8 0 amappl6 120 155 0 154 1 0 1 1 0 8 0 amappl5 112 97 0 85 1 0 1 1 0 8 0 amappl4 104 352 0 333 1 0 1 1 0 8 0 amappl3 96 1870 0 1773 3 0 3 3 0 8 0 amappl2 88 621 0 542 2 0 2 2 0 8 0 amappl1 80 10577 0 9977 15 0 15 15 0 8 2 amappl 88 2919 0 2752 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 128 253 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 5 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 6098 0 6059 2 0 2 2 0 8 0 vmmpepl 168 41368 0 39459 87 0 87 87 0 357 0 vmsppl 488 502 0 472 5 0 5 5 0 8 1 rwobjpl 80 15027 0 13994 23 0 23 23 0 8 0 pdppl 4096 1013 0 944 95 22 73 83 0 8 4 pvpl 32 11988 0 0 97 0 97 97 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 112 421 0 25 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83954ff0) 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(3f8,0,6c) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,6c) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6c) at comcnputc+0x1ab sys/dev/ic/com.c:1268 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff83545ef1) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3fb820) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c3fb820) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3fb820) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fee2b0,fffff7006b0cd638,ffff80003c3fb9e0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff800045fee2b0,ffff80003c3fbb30,ffff80003c3fba80) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 end trace frame: 0xffff80003c3fbb20, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83954ff0) 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(3f8,0,6c) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790 comcnputc(800,6c) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline] comcnputc(800,6c) at comcnputc+0x1ab sys/dev/ic/com.c:1268 cnputc(6c) at cnputc+0x67 sys/dev/cons.c:218 db_putchar(6c) at db_putchar+0x36d sys/ddb/db_output.c:155 kprintf() at kprintf+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff83545ef1) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c3fb820) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c3fb820) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c3fb820) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800045fee2b0,fffff7006b0cd638,ffff80003c3fb9e0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff800045fee2b0,ffff80003c3fbb30,ffff80003c3fba80) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff80003c3fbb30) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c3fbb30) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1f9dfb945f0, 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: 0x790ebc107700, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x790ebc107700, count: -1