uvm_fault(fffffd8075fccb28,19000,0,2) at uvm_fault+0xf2 sys/uvm/uvm_fault.c:600
kpageflttrap(ffff8000230eade0,19500) at kpageflttrap+0x252 sys/arch/amd64/amd64/trap.c:279
kerntrap(ffff8000230eade0) at kerntrap+0xf3 sys/arch/amd64/amd64/trap.c:332
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x57
syscall(ffff8000230eb230) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000230eb230) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x66b97dc2e60, count: -17
ddb{0}> machine ddbcpu 1
Stopped at      db_enter+0x1c:  addq    $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
witness_checkorder(fffffd8066bb7c50,9,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2510 [inline]
witness_checkorder(fffffd8066bb7c50,9,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1110
rw_enter(fffffd8066bb7c40,1) at rw_enter+0xd5 sys/kern/kern_rwlock.c:249
rrw_enter(fffffd8066bb7c40,1) at rrw_enter+0x8c sys/kern/kern_rwlock.c:464
VOP_LOCK(fffffd80665baeb8,2001) at VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
vn_lock(fffffd80665baeb8,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:564
vn_rdwr(1,fffffd80665baeb8,ffff800008a43180,10000,0,1,2ba5d6e4df660119,ffff8000006b7000,fffffd8075afd148,0) at vn_rdwr+0xb5 sys/kern/vfs_vnops.c:320
vndstrategy(fffffd8075afd148) at vndstrategy+0x3c1 sys/dev/vnd.c:342
physio(ffffffff81217670,2902,0,ffffffff81b6dde0,ffff8000230f7c30) at physio+0x289 sys/kern/kern_physio.c:163
spec_write(ffff8000230f7a10) at spec_write+0xd9 sys/kern/spec_vnops.c:302
VOP_WRITE(fffffd806e570d08,ffff8000230f7c30,5,fffffd807f7d7340) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd805c094140,ffff8000230f7c30,0) at vn_write+0x15b sys/kern/vfs_vnops.c:408
dofilewritev(ffff800021eccd48,3,ffff8000230f7c30,0,ffff8000230f7d20) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375
sys_writev(ffff800021eccd48,ffff8000230f7cd0,ffff8000230f7d20) at sys_writev+0xab sys/kern/sys_generic.c:322
syscall(ffff8000230f7da0) at syscall+0x606 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000230f7da0) at syscall+0x606 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xef5639f5ff0, count: -16