[Bug 106022] [snb] GPU HANG: ecode 6:0:0x85fffffc, in neverball

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106022

--- Comment #4 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
There are unknown instructions in the content of one of the BCS batchbuffer (in
both error states) :

--- ring buffer (bcs0) at 0x00000000 001f6000
0x001f6000:  0x11000001:  MI_LOAD_REGISTER_IMM                                  
0x001f6000:  0x11000001 : Dword 0
    DWord Length: 1
    Byte Write Disables: 0
0x001f6004:  0x00002044 : Dword 1
    Register Offset: 0x00002044
0x001f6008:  0x0057fe00 : Dword 2
    Data DWord: 5766656
0x001f600c:  0x11000001:  MI_LOAD_REGISTER_IMM                                  
0x001f600c:  0x11000001 : Dword 0
    DWord Length: 1
    Byte Write Disables: 0
0x001f6010:  0x00012040 : Dword 1
    Register Offset: 0x00012040
0x001f6014:  0x0057fe00 : Dword 2
    Data DWord: 5766656
0x001f6018:  0x10800001:  MI_STORE_DATA_INDEX                                   
0x001f6018:  0x10800001 : Dword 0
    DWord Length: 1
0x001f601c:  0x000000c0 : Dword 1
    Offset: 48
0x001f6020:  0x0057fe00 : Dword 2
    Data DWord 0: 5766656
0x001f6024:  0x01000000:  MI_USER_INTERRUPT                                     
0x001f6024:  0x01000000 : Dword 0
0x001f6028: unknown instruction 13244001
0x001f6034:  0x00000000:  MI_NOOP                                               
0x001f6034:  0x00000000 : Dword 0
    Identification Number: 0
    Identification Number Register Write Enable: false
0x001f6038:  0x18800100:  MI_BATCH_BUFFER_START                                 
0x001f6038:  0x18800100 : Dword 0
    DWord Length: 0
    Address Space Indicator: 1 (PPGTT)
    Clear Command Buffer Enable: false
0x001f603c:  0x16a2a000 : Dword 1
    Batch Buffer Start Address: 0x16a2a000

The other has 2 :

--- ring buffer (bcs0) at 0x00000000 001f6000
0x001f6000: unknown instruction 13204001
0x001f600c:  0x00000000:  MI_NOOP                                               
0x001f600c:  0x00000000 : Dword 0
    Identification Number: 0
    Identification Number Register Write Enable: false
0x001f6010:  0x11000001:  MI_LOAD_REGISTER_IMM                                  
0x001f6010:  0x11000001 : Dword 0
    DWord Length: 1
    Byte Write Disables: 0
0x001f6014:  0x00002044 : Dword 1
    Register Offset: 0x00002044
0x001f6018:  0x0001dd78 : Dword 2
    Data DWord: 122232
0x001f601c:  0x11000001:  MI_LOAD_REGISTER_IMM                                  
0x001f601c:  0x11000001 : Dword 0
    DWord Length: 1
    Byte Write Disables: 0
0x001f6020:  0x00012040 : Dword 1
    Register Offset: 0x00012040
0x001f6024:  0x0001dd78 : Dword 2
    Data DWord: 122232
0x001f6028:  0x10800001:  MI_STORE_DATA_INDEX                                   
0x001f6028:  0x10800001 : Dword 0
    DWord Length: 1
0x001f602c:  0x000000c0 : Dword 1
    Offset: 48
0x001f6030:  0x0001dd78 : Dword 2
    Data DWord 0: 122232
0x001f6034:  0x01000000:  MI_USER_INTERRUPT                                     
0x001f6034:  0x01000000 : Dword 0
0x001f6038:  0x0b140001:  MI_SEMAPHORE_MBOX                                     
0x001f6038:  0x0b140001 : Dword 0
    DWord Length: 1
    Register Select: 0 (RVSYNC)
0x001f603c:  0x0011cfd6 : Dword 1
    Semaphore Data Dword: 1167318
0x001f6044:  0x00000000:  MI_NOOP                                               
0x001f6044:  0x00000000 : Dword 0
    Identification Number: 0
    Identification Number Register Write Enable: false
0x001f6048: unknown instruction 13244001
0x001f6054:  0x00000000:  MI_NOOP                                               
0x001f6054:  0x00000000 : Dword 0
    Identification Number: 0
    Identification Number Register Write Enable: false
0x001f6058:  0x18800100:  MI_BATCH_BUFFER_START                                 
0x001f6058:  0x18800100 : Dword 0
    DWord Length: 0
    Address Space Indicator: 1 (PPGTT)
    Clear Command Buffer Enable: false
0x001f605c:  0x00040000 : Dword 1
    Batch Buffer Start Address: 0x00040000

I can't figure what instruction that is... It seems to be a synchronization
batch emitted by the kernel.
Could you tell us what version of the kernel you were running before/after your
upgrade?

Thanks!

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