0: kd> .bugcheck
Bugcheck code 1000007E
Arguments ffffffff`c0000005 fffff801`e5b31160 ffffd000`219b29e8 ffffd000`219b21f0
Reason for bug check was an access violation.
0: kd> .exr 0xffffd000219b29e8
ExceptionAddress: fffff801e5b31160 (atikmdag+0x00000000000cd160)
ExceptionCode: c0000005 (Access violation)
Looks like the AMD/ATI video card driver was responsible for the access violation, but why?
0: kd> .cxr 0xffffd000219b21f0
rax=0000000000000000 rbx=0000000000000000 rcx=0000000000000000
rdx=0000000000000000 rsi=ffffe001e9b89df8 rdi=0000000000000001
rip=fffff801e5b31160 rsp=ffffd000219b2c28 rbp=ffffe001e9b89df8
r8=0000000000000004 r9=7fffe001e41c6340 r10=ffffe001e41c6340
r11=7ffffffffffffffc r12=ffffe001e3185010 r13=0000000000000000
r14=0000000000000001 r15=ffffe001eb23c3c8
iopl=0 nv up ei ng nz na pe nc
cs=0010 ss=0018 ds=002b es=002b fs=0053 gs=002b efl=00010282
atikmdag+0xcd160:
fffff801`e5b31160 488b4130 mov rax,qword ptr [rcx+30h] ds:002b:00000000`00000030=????????????????
rax/rcx are non-volatile so we cannot check their contents, therefore we don't know why the violation occurred. We can guess however that it's a bug in your AMD/ATI driver causing one of them to be invalid as far as setting rax to the value at address rcx+30
goes.
0: kd> lmvm atikmdag
start end module name
fffff801`e5a64000 fffff801`e6ce8000 atikmdag T (no symbols)
Loaded symbol image file: atikmdag.sys
Image path: \SystemRoot\system32\DRIVERS\atikmdag.sys
Image name: atikmdag.sys
Timestamp: Thu Nov 20 21:30:27 2014 (546EA3C3)
CheckSum: 0121F198
ImageSize: 01284000
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
2014 dated. Update to latest or if already latest, roll back til crashes stop.