*cpu0: uvm_fault(0xfffff4800e59d3f0, 0x98, 0, 1) -> e ddb{1}> show kasan No such command ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79724da015c0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80003c41d4b0 rbx 0 rdx 0 rcx 0xffff800045fee018 rax 0x3b r8 0xffff80003c41d3e0 r9 0 r10 0xaf6aeddf2a0d8c3f r11 0x3619512366eec245 r12 0 r13 0 r14 0xffff800045fee018 r15 0 rip 0xffffffff8105a3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80003c41d430 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=420152 pid=9979 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=0xffff8000373934e0,0xffff800045feea88 process=0xffff80003c3d89c0 user=0xffff80003c418000, vmspace=0xfffff4800e59db90 estcpu=36, cpticks=1, pctcpu=0.0, user=1, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND * 9979 420152 80020 0 7 0 0 syz-executor 9979 160238 80020 0 3 0 0x4000080 fsleep syz-executor 88663 129193 33927 0 2 0 0 syz-executor 88663 100568 33927 0 7 0 0x4000000 syz-executor 80776 353015 22225 0 2 0 0 syz-executor 80776 467142 22225 0 3 0 0x4000080 fsleep syz-executor 6875 446270 53895 0 2 0 0 syz-executor 6875 303478 53895 0 3 0 0x4000080 wsevent_r syz-executor 37419 8911 33071 0 2 0 0 syz-executor 37419 186188 33071 0 3 0 0x4000080 fsleep syz-executor 57181 467001 54212 0 3 0 0x80 nanoslp syz-executor 57181 392084 54212 0 3 0 0x4000080 ttyout syz-executor 57181 210278 54212 0 3 0 0x4000080 fsleep syz-executor 32629 186679 95874 0 3 0 0x80 nanoslp syz-executor 32629 276772 95874 0 3 0 0x4000080 fsleep syz-executor 32629 230540 95874 0 3 0 0x4000080 pipewr syz-executor 22225 314026 55601 0 2 0x2 0xc80 syz-executor 80020 181686 55601 0 2 0x2 0xc80 syz-executor 33927 266636 55601 0 3 0x2 0x80 nanoslp syz-executor 26198 393396 55601 0 2 0x10000002 0 syz-executor 53895 463905 55601 0 3 0x2 0x80 nanoslp syz-executor 95874 448348 55601 0 3 0x2 0x80 nanoslp syz-executor 33071 112483 55601 0 3 0x2 0x80 nanoslp syz-executor 54212 411553 55601 0 3 0x2 0x80 nanoslp syz-executor 55601 87004 99619 0 3 0x2 0x80 kqread syz-executor 99619 243488 44077 0 3 0x100002 0x88 sigsusp ksh 44077 209821 31572 0 3 0x10 0x88 kqread sshd-session 31572 320334 72532 0 3 0x12 0x80 kqread sshd-session 11168 29383 1 0 3 0x100003 0x80 ttyin getty 72532 404927 1 0 3 0 0x88 kqread sshd 21472 226144 65822 74 3 0x1100012 0x80 bpf pflogd 65822 393922 1 0 3 0 0x80 sbwait pflogd 27001 322783 98584 73 3 0x1100010 0x80 kqread syslogd 98584 106534 1 0 3 0x100002 0x80 sbwait syslogd 83073 286995 1 0 3 0x100000 0x80 kqread resolvd 65132 99643 54307 77 3 0x100012 0x80 kqread dhcpleased 18286 457924 54307 77 3 0x100012 0x80 kqread dhcpleased 54307 454789 1 0 3 0 0x80 kqread dhcpleased 57004 207749 0 0 3 0x14000 0x200 bored smr 37909 55693 0 0 2 0x14000 0x200 zerothread 39046 424432 0 0 3 0x14000 0x200 aiodoned aiodoned 10659 418336 0 0 3 0x14000 0x200 syncer update 59370 149693 0 0 3 0x14000 0x200 cleaner cleaner 96108 168697 0 0 3 0x14000 0x200 reaper reaper 9721 281841 0 0 3 0x14000 0x200 pgdaemon pagedaemon 32016 291858 0 0 3 0x14000 0x200 bored viomb 15001 96955 0 0 3 0x14000 0x40000200 acpi0 acpi0 67868 179841 0 0 3 0x14000 0x40000200 idle1 68166 360891 0 0 3 0x14000 0x200 bored softnet1 15366 155596 0 0 3 0x14000 0x200 bored softnet0 19413 376042 0 0 3 0x14000 0x200 smrbar systqmp 96315 248690 0 0 3 0x14000 0x200 bored systq 12772 231560 0 0 3 0x14000 0x200 tmoslp softclockmp 54152 347185 0 0 3 0x14000 0x40000200 tmoslp softclock 94148 419315 0 0 3 0x14000 0x40000200 idle0 1 311192 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 (0xfffff4806ccc0a10) #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 9979 (syz-executor) thread 0xffff800045fee018 (420152) exclusive rwlock uobjlk r = 0 (0xfffff4806ceb1930) #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 (0xfffff4800e59dc90) #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 (0xfffff4806ccc0a10) #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 88663 (syz-executor) thread 0xffff800037393ca8 (100568) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a81b00) #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 6875 (syz-executor) thread 0xffff800045fee548 (303478) exclusive rrwlock inode r = 0 (0xfffff4807ef4eea8) #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 spec_open+0x2f2 sys/kern/spec_vnops.c:151 #6 VOP_OPEN+0x8b sys/kern/vfs_vops.c:138 #7 vn_open+0x7a5 sys/kern/vfs_vnops.c:183 #8 vndioctl+0xc43 sys/dev/vnd.c:458 #9 VOP_IOCTL+0xac sys/kern/vfs_vops.c:264 #10 vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537 #11 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #12 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #12 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783 #13 Xsyscall+0x128 Process 19413 (systqmp) thread 0xffff800045ffe298 (376042) shared rwlock systqmp r = 0 (0xffffffff839993b8) #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 11082 12299K 12346K 166960K 12223 0 pcb 18 12K 12K 166960K 23 0 rtable 247 10K 10K 166960K 372 0 pf 34 17K 24K 166960K 66 0 ifaddr 43 7K 7K 166960K 48 0 ifgroup 55 2K 2K 166960K 62 0 sysctl 1 1K 9K 166960K 5 0 counters 70 37K 37K 166960K 80 0 ioctlops 0 0K 4K 166960K 1489 0 iov 0 0K 1K 166960K 1 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1305 82K 82K 166960K 1391 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 17 61K 89K 166960K 155 0 proc 70 115K 147K 166960K 552 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 99 6K 7K 166960K 104 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 382 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 234 151K 159K 166960K 3120 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 42 84K 101K 166960K 1311 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 28 2K 2K 166960K 30 0 temp 36 9114K 9120K 166960K 3954 0 kqueue 14 22K 24K 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 35 0 32 1 0 1 1 0 8 0 rtentry 176 112 0 2 6 0 6 6 0 8 1 unpcb 144 45 0 26 1 0 1 1 0 8 0 syncache 336 4 0 4 1 0 1 1 0 8 1 tcpcb 736 9 0 4 1 0 1 1 0 8 0 arp 136 18 0 0 1 0 1 1 0 8 0 inpcb 328 74 0 65 1 0 1 1 0 8 0 nd6 152 24 0 0 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 4 0 4 1 0 1 1 0 8 1 pppxif 1576 1 0 1 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 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 pfanchor 1288 9 0 9 1 0 1 1 0 8 1 pfstitem 24 18 0 0 1 0 1 1 0 8 0 pfstkey 128 18 0 0 1 0 1 1 0 8 0 pfstate 448 18 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 459 0 0 29 0 29 29 0 8 0 art_table 40 460 0 0 5 0 5 5 0 8 0 art_node 32 112 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 1 1 0 1 1 0 8 1 semapl 72 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1601 0 129 92 0 92 92 0 8 0 ffsino 296 1601 0 129 114 0 114 114 0 8 0 nchpl 144 1818 0 109 64 0 64 64 0 8 0 rtmask 32 2 0 2 1 0 1 1 0 8 1 vnodes 216 1710 0 0 95 0 95 95 0 8 0 namei 1024 5561 0 5561 2 0 2 2 0 8 2 percpumem 16 56 0 5 1 0 1 1 0 8 0 kstatmem 264 31 0 4 2 0 2 2 0 8 0 scxspl 216 6232 0 6232 3 1 2 2 1 8 2 plimitpl 152 29 0 12 1 0 1 1 0 8 0 sigapl 424 472 0 424 7 0 7 7 0 8 1 knotepl 120 526 0 0 16 0 16 16 0 8 0 kqueuepl 224 27 0 17 1 0 1 1 0 8 0 pipepl 344 127 0 99 3 0 3 3 0 8 0 fdescpl 528 456 0 425 3 0 3 3 0 8 0 filepl 160 1657 0 1429 10 0 10 10 0 8 0 lockfpl 104 19 0 16 1 0 1 1 0 8 0 lockfspl 48 11 0 8 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 104 110 0 96 1 0 1 1 0 8 0 zombiepl 144 425 0 424 1 0 1 1 0 8 0 processpl 1232 472 0 424 5 0 5 5 0 8 0 procpl 664 513 0 456 5 0 5 5 0 8 0 sockpl 752 156 0 124 4 0 4 4 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 127 0 0 16 0 16 16 0 8 0 mcl2k 2048 22 0 0 3 0 3 3 0 8 0 mextrefs 64 25 0 0 1 0 1 1 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 158 0 0 10 0 10 10 0 8 0 bufpl 272 2311 0 105 148 0 148 148 0 8 0 anonpl 32 3468 0 0 28 0 28 28 0 247 0 amapchunkpl 152 8352 0 7853 21 0 21 21 0 158 0 amappl16 200 968 0 949 4 0 4 4 0 8 2 amappl15 192 7 0 7 1 0 1 1 0 8 1 amappl14 184 427 0 426 1 0 1 1 0 8 0 amappl13 176 147 0 135 1 0 1 1 0 8 0 amappl12 168 712 0 682 2 0 2 2 0 8 0 amappl11 160 58 0 58 1 0 1 1 0 8 1 amappl10 152 62 0 48 1 0 1 1 0 8 0 amappl9 144 276 0 275 1 0 1 1 0 8 0 amappl8 136 94 0 92 1 0 1 1 0 8 0 amappl7 128 175 0 162 1 0 1 1 0 8 0 amappl6 120 156 0 155 1 0 1 1 0 8 0 amappl5 112 100 0 90 1 0 1 1 0 8 0 amappl4 104 315 0 296 1 0 1 1 0 8 0 amappl3 96 1535 0 1435 3 0 3 3 0 8 0 amappl2 88 569 0 492 2 0 2 2 0 8 0 amappl1 80 10568 0 9964 14 0 14 14 0 8 0 amappl 88 2395 0 2231 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 456 0 425 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 456 0 425 1 0 1 1 0 8 0 vmmpekpl 168 5810 0 5773 2 0 2 2 0 8 0 vmmpepl 168 37903 0 36012 86 0 86 86 0 357 0 vmsppl 488 455 0 425 5 0 5 5 0 8 0 rwobjpl 80 13819 0 12796 23 0 23 23 0 8 0 pdppl 4096 919 0 850 95 12 83 83 0 8 14 pvpl 32 10064 0 0 82 0 82 82 0 265 0 pmappl 256 455 0 425 3 0 3 3 0 8 0 extentpl 40 46 0 28 1 0 1 1 0 8 0 phpool 112 414 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(ffffffff839d6ff0) 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(ffffffff834ae4d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff800038fb79e0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff800038fb79e0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff800038fb79e0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800037393ca8,fffff48069d607b0,ffff800038fb7ba0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff800037393ca8,ffff800038fb7cf0,ffff800038fb7c40) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 end trace frame: 0xffff800038fb7ce0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff839d6ff0) 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(ffffffff834ae4d0) at db_printf+0x9b sys/kern/subr_prf.c:-1 db_ktrap(6,0,ffff800038fb79e0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline] db_ktrap(6,0,ffff800038fb79e0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128 kerntrap(ffff800038fb79e0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dovutimens(ffff800037393ca8,fffff48069d607b0,ffff800038fb7ba0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691 sys_futimens(ffff800037393ca8,ffff800038fb7cf0,ffff800038fb7c40) at sys_futimens+0xb3 sys/kern/vfs_syscalls.c:2767 syscall(ffff800038fb7cf0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800038fb7cf0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1001c31d0, 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: 0x79724da015c0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x79724da015c0, count: -1