*cpu0: uvm_fault(0xfffff1006cd16d78, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7554a0a8dc00, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c3c4cf0 rbx 0 rdx 0 rcx 0xffff800045fe7a10 rax 0x32 r8 0xffff80003c3c4c20 r9 0x2080713 __kernel_phys_base+0x1080713 r10 0x20bb0dcad57095ee r11 0x353b1267e63b925a r12 0 r13 0 r14 0xffff800045fe7a10 r15 0 rip 0xffffffff826b93ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c3c4c70 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=121204 pid=6485 tcnt=3 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=0xffff800045fe6d18,0xffff800045fe6560 process=0xffff80003c45c9c8 user=0xffff80003c3bf000, vmspace=0xfffff1006cd16d78 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND 33058 90819 94512 0 2 0 0 syz-executor 33058 60620 94512 0 3 0 0x4000080 fsleep syz-executor * 6485 121204 50594 0 7 0 0 syz-executor 6485 375646 50594 0 3 0 0x4000080 fsleep syz-executor 6485 524249 50594 0 7 0 0x4000000 syz-executor 15704 198950 4102 0 2 0 0 syz-executor 15704 62864 4102 0 3 0 0x4000080 fsleep syz-executor 25560 203347 35972 0 2 0 0 syz-executor 25560 195455 35972 0 3 0 0x4000080 bell syz-executor 61314 517722 54586 0 2 0 0 syz-executor 61314 471469 54586 0 3 0 0x4000080 fsleep syz-executor 75998 124465 48914 0 2 0 0 syz-executor 75998 493515 48914 0 3 0 0x4000080 fsleep syz-executor 13415 61483 7809 0 3 0 0x80 nanoslp syz-executor 13415 211968 7809 0 3 0 0x4000080 kqread syz-executor 13415 132220 7809 0 3 0 0x4000080 fsleep syz-executor 13415 442307 7809 0 3 0 0x4000080 fsleep syz-executor 13415 1863 7809 0 3 0 0x4000080 fsleep syz-executor 2455 284136 0 0 3 0x14000 0x280 nfsidl nfsio 21574 250991 0 0 3 0x14000 0x280 nfsidl nfsio 76637 373311 0 0 3 0x14000 0x280 nfsidl nfsio 28631 46765 0 0 3 0x14000 0x280 nfsidl nfsio 37210 346508 0 0 3 0x14000 0x280 nfsidl nfsio 56460 264642 0 0 3 0x14000 0x280 nfsidl nfsio 79829 204120 0 0 3 0x14000 0x280 nfsidl nfsio 36350 207693 0 0 3 0x14000 0x280 nfsidl nfsio 48212 268882 0 0 3 0x14000 0x280 nfsidl nfsio 74722 121833 0 0 3 0x14000 0x280 nfsidl nfsio 55068 435371 0 0 3 0x14000 0x280 nfsidl nfsio 1407 215581 0 0 3 0x14000 0x280 nfsidl nfsio 31998 39677 0 0 3 0x14000 0x280 nfsidl nfsio 34467 298371 0 0 3 0x14000 0x280 nfsidl nfsio 79932 410685 0 0 3 0x14000 0x280 nfsidl nfsio 35856 273328 0 0 3 0x14000 0x280 nfsidl nfsio 70019 5051 0 0 3 0x14000 0x280 nfsidl nfsio 76571 300837 0 0 3 0x14000 0x280 nfsidl nfsio 84622 482924 0 0 3 0x14000 0x280 nfsidl nfsio 44351 467517 0 0 3 0x14000 0x280 nfsidl nfsio 80342 292615 0 0 3 0x14000 0x200 acct acct 48914 313913 8588 0 3 0x2 0x80 nanoslp syz-executor 61374 389070 8588 0 3 0x2 0x80 wait syz-executor 7809 220083 8588 0 2 0x2 0 syz-executor 35972 339724 8588 0 2 0x2 0xc80 syz-executor 54586 229004 8588 0 2 0x2 0xc80 syz-executor 94512 359523 8588 0 3 0x2 0x80 nanoslp syz-executor 50594 65067 8588 0 2 0x2 0xc80 syz-executor 4102 349756 8588 0 2 0x2 0xc80 syz-executor 8588 355865 92660 0 3 0x2 0x80 kqread syz-executor 92660 362865 36882 0 3 0x100002 0x88 sigsusp ksh 36882 427162 55925 0 3 0x10 0x88 kqread sshd-session 55925 204609 88941 0 3 0x12 0x80 kqread sshd-session 10689 443588 1 0 3 0x100003 0x80 ttyin getty 88941 411001 1 0 3 0 0x88 kqread sshd 13382 396803 36245 74 3 0x1100012 0x80 bpf pflogd 36245 96986 1 0 3 0 0x80 sbwait pflogd 10380 258493 62383 73 3 0x1100010 0x80 kqread syslogd 62383 510539 1 0 3 0x100002 0x80 sbwait syslogd 31868 341551 1 0 3 0x100000 0x80 kqread resolvd 82828 132621 68291 77 3 0x100012 0x80 kqread dhcpleased 58358 66189 68291 77 3 0x100012 0x80 kqread dhcpleased 68291 101033 1 0 3 0 0x80 kqread dhcpleased 87487 152394 0 0 3 0x14000 0x200 bored smr 58996 390460 0 0 2 0x14000 0x200 zerothread 21542 477975 0 0 3 0x14000 0x200 aiodoned aiodoned 8752 152375 0 0 3 0x14000 0x200 syncer update 2877 58000 0 0 3 0x14000 0x200 cleaner cleaner 9498 90726 0 0 3 0x14000 0x200 reaper reaper 16299 26798 0 0 3 0x14000 0x200 pgdaemon pagedaemon 80483 509335 0 0 3 0x14000 0x200 bored viomb 5653 91535 0 0 3 0x14000 0x40000200 acpi0 acpi0 41362 441821 0 0 3 0x14000 0x40000200 idle1 34048 229175 0 0 3 0x14000 0x200 bored softnet1 52520 338994 0 0 3 0x14000 0x200 bored softnet0 24014 479465 0 0 3 0x14000 0x200 bored systqmp 52170 305229 0 0 3 0x14000 0x200 bored systq 14823 517766 0 0 3 0x14000 0x200 tmoslp softclockmp 85368 458870 0 0 3 0x14000 0x40000200 tmoslp softclock 19332 147000 0 0 3 0x14000 0x40000200 idle0 1 487050 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 /syzkaller/managers/multicore/kernel/sys/dev/rnd.c:322 r = 0 (0xffffffff8399fe30) #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 arc4random+0x35 _rs_stir_if_needed sys/dev/rnd.c:-1 [inline] #2 arc4random+0x35 _rs_random_u32 sys/dev/rnd.c:514 [inline] #2 arc4random+0x35 sys/dev/rnd.c:529 #3 uvm_map_hint+0x97 sys/uvm/uvm_map.c:3863 #4 uaddr_rnd_select+0x2f3 sys/uvm/uvm_addr.c:554 #5 uvm_addr_invoke+0x145 sys/uvm/uvm_addr.c:389 #6 uvm_map_findspace+0x86 sys/uvm/uvm_map.c:668 #7 uvm_mapanon+0x717 sys/uvm/uvm_map.c:842 #8 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #9 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 Process 6485 (syz-executor) thread 0xffff800045fe7a10 (121204) exclusive rwlock vmmaplk r = 0 (0xfffff1006cd16e78) #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_mapanon+0x28f sys/uvm/uvm_map.c:-1 #4 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #5 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #7 Xsyscall+0x128 exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/rnd.c:322 r = 0 (0xffffffff8399fe30) #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 arc4random+0x35 _rs_stir_if_needed sys/dev/rnd.c:-1 [inline] #2 arc4random+0x35 _rs_random_u32 sys/dev/rnd.c:514 [inline] #2 arc4random+0x35 sys/dev/rnd.c:529 #3 uvm_map_hint+0x97 sys/uvm/uvm_map.c:3863 #4 uaddr_rnd_select+0x2f3 sys/uvm/uvm_addr.c:554 #5 uvm_addr_invoke+0x145 sys/uvm/uvm_addr.c:389 #6 uvm_map_findspace+0x86 sys/uvm/uvm_map.c:668 #7 uvm_mapanon+0x717 sys/uvm/uvm_map.c:842 #8 uvm_mmapanon+0x1d0 sys/uvm/uvm_mmap.c:1029 #9 sys_mmap+0xa80 sys/uvm/uvm_mmap.c:426 #10 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #11 Xsyscall+0x128 Process 6485 (syz-executor) thread 0xffff80003c496a98 (524249) 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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11102 12103K 12293K 166960K 12481 0 pcb 17 14K 16K 166960K 301 0 rtable 235 8K 8K 166960K 532 0 pf 35 17K 23K 166960K 130 0 ifaddr 39 6K 7K 166960K 62 0 ifgroup 51 2K 2K 166960K 100 0 sysctl 3 1K 9K 166960K 11 0 counters 68 36K 37K 166960K 104 0 ioctlops 0 0K 4K 166960K 1684 0 iov 0 0K 13K 166960K 80 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1292 81K 82K 166960K 1652 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 26 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 18 65K 89K 166960K 458 0 sigio 0 0K 0K 166960K 11 0 proc 72 115K 147K 166960K 592 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 315 0 in_multi 88 5K 6K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 mrt 0 0K 0K 166960K 21 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 271 1208K 1208K 166960K 271 0 exec 0 0K 1K 166960K 775 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 244 175K 185K 166960K 6002 0 UVM aobj 14 2K 2K 166960K 14 0 pinsyscall 43 86K 102K 166960K 1614 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 8 0 NDP 11 0K 2K 166960K 42 0 temp 40 9119K 9182K 166960K 19897 0 kqueue 14 22K 26K 166960K 65 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 49 0 46 1 0 1 1 0 8 0 rtentry 176 187 0 84 6 0 6 6 0 8 1 unpcb 144 181 0 164 1 0 1 1 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 736 177 0 173 7 3 4 7 0 8 3 arp 136 19 0 2 1 0 1 1 0 8 0 inpcb 328 670 0 662 9 2 7 9 0 8 6 nd6 152 29 0 5 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 11 0 11 1 0 1 1 0 8 1 pppxif 1576 1 0 1 1 0 1 1 0 8 1 pfstscr 40 132 0 128 1 0 1 1 0 8 0 pffrag 232 5 0 1 1 0 1 1 0 482 0 pffrnode 88 5 0 1 1 0 1 1 0 8 0 pffrent 40 8 0 4 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 pfrktable 1344 2 0 1 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfstitem 24 54 0 2 1 0 1 1 0 8 0 pfstkey 128 182 0 130 2 0 2 2 0 8 0 pfstate 448 116 0 66 6 0 6 6 0 8 0 pfrule 1360 59 0 20 5 1 4 4 0 8 0 rttmr 136 3 0 3 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 545 0 117 30 1 29 30 0 8 1 art_table 40 546 0 117 5 0 5 5 0 8 0 art_node 32 121 0 28 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 72 23 0 13 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2209 0 748 93 0 93 93 0 8 0 ffsino 296 2209 0 748 114 0 114 114 0 8 0 nchpl 144 2853 0 1150 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 2441 0 0 136 0 136 136 0 8 0 namei 1024 9589 0 9589 2 1 1 1 0 8 1 percpumem 16 68 0 18 1 0 1 1 0 8 0 kstatmem 264 55 0 30 3 1 2 3 0 8 0 scsiplug 72 2 0 2 2 1 1 1 0 8 1 scxspl 216 9969 0 9969 9 4 5 6 1 8 5 plimitpl 152 136 0 118 1 0 1 1 0 8 0 sigapl 424 796 0 727 9 1 8 8 0 8 0 knotepl 120 314 0 0 10 0 10 10 0 8 0 kqueuepl 224 101 0 91 1 0 1 1 0 8 0 pipepl 344 144 0 117 3 0 3 3 0 8 0 fdescpl 528 759 0 727 3 0 3 3 0 8 0 filepl 160 4335 0 4112 13 0 13 13 0 8 2 lockfpl 104 283 0 281 1 0 1 1 0 8 0 lockfspl 48 67 0 65 1 0 1 1 0 8 0 sessionpl 144 32 0 23 1 0 1 1 0 8 0 pgrppl 48 43 0 26 1 0 1 1 0 8 0 ucredpl 104 693 0 680 1 0 1 1 0 8 0 zombiepl 144 919 0 918 2 1 1 1 0 8 0 processpl 1232 796 0 727 6 0 6 6 0 8 0 procpl 664 1370 0 1290 8 0 8 8 0 8 0 sosppl 176 5 0 5 1 0 1 1 0 8 1 sockpl 752 914 0 886 13 2 11 12 0 8 7 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k128 9344 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 14 0 14 14 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mextrefs 64 19 0 0 1 0 1 1 0 8 0 mtagpl 96 5 0 0 1 0 1 1 0 8 0 mbufpl 256 335 0 0 21 0 21 21 0 8 0 bufpl 272 3280 0 107 212 0 212 212 0 8 0 anonpl 32 5776 0 0 47 0 47 47 0 247 0 amapchunkpl 152 18618 0 18095 28 0 28 28 0 158 6 amappl16 200 1783 0 1751 7 4 3 5 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 432 0 431 1 0 1 1 0 8 0 amappl13 176 126 0 114 1 0 1 1 0 8 0 amappl12 168 1007 0 976 2 0 2 2 0 8 0 amappl11 160 27 0 27 1 1 0 1 0 8 0 amappl10 152 64 0 49 1 0 1 1 0 8 0 amappl9 144 288 0 288 1 1 0 1 0 8 0 amappl8 136 100 0 98 1 0 1 1 0 8 0 amappl7 128 149 0 136 1 0 1 1 0 8 0 amappl6 120 154 0 152 1 0 1 1 0 8 0 amappl5 112 96 0 85 1 0 1 1 0 8 0 amappl4 104 291 0 271 1 0 1 1 0 8 0 amappl3 96 3373 0 3267 3 0 3 3 0 8 0 amappl2 88 882 0 800 2 0 2 2 0 8 0 amappl1 80 11857 0 11245 14 1 13 14 0 8 0 amappl 88 5227 0 5056 5 0 5 5 0 92 0 uvmvnodes 80 109 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 759 0 727 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 759 0 727 1 0 1 1 0 8 0 vmmpekpl 168 8085 0 8050 3 0 3 3 0 8 0 vmmpepl 168 55697 0 53706 89 0 89 89 0 357 2 vmsppl 488 758 0 727 5 1 4 5 0 8 0 rwobjpl 80 18072 0 16997 23 0 23 23 0 8 0 pdppl 4096 1525 0 1454 93 22 71 83 0 8 0 pvpl 32 15532 0 0 127 1 126 126 0 265 0 pmappl 256 758 0 727 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 501 0 31 14 0 14 14 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83984ff0) 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:790 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:1268 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+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff835480cf) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c471320) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c471320) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c471320) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c496a98,fffff1006c7ed028,ffff80003c4714e0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff80003c496a98,ffff80003c471630,ffff80003c471580) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 end trace frame: 0xffff80003c471620, count: 0 ddb{0}> trace x86_ipi_db(ffffffff83984ff0) 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:790 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:1268 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+0x223 sys/kern/subr_prf.c:723 db_printf(ffffffff835480cf) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff80003c471320) at db_ktrap+0xe3 db_printtrap sys/arch/amd64/amd64/db_interface.c:99 [inline] db_ktrap(6,0,ffff80003c471320) at db_ktrap+0xe3 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff80003c471320) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff80003c496a98,fffff1006c7ed028,ffff80003c4714e0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff80003c496a98,ffff80003c471630,ffff80003c471580) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff80003c471630) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c471630) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8fc7f463ac0, 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: 0x7554a0a8dc00, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7554a0a8dc00, count: -1