There are constant improvements pushed in Mesa that will benefit to your system, so please re-test with latest kernel & Mesa to see if this issue is still occurring.

In parallel, assigning to Mesa product.

Kernel: 4.8.1-1-ARCH
Platform: Ivybridge (pci id: 0x0166, PCI Revision: 0x09, PCI Subsystem: 17aa:21fa)
Mesa: [Please confirm your mesa version]

From this error dump, hung is happening in render ring batch with active head at 0x7ede8224, with 0x79000002 (3DSTATE_DRAWING_RECTANGLE) as IPEHR.

We can note also an error
ERROR: 0x00000101
    TLB page fault error (GTT entry not valid)
    Cacheline containing a PD was marked as invalid
(and on render ring we see: Unloaded PD Fault (PPGTT))

Batch extract (around 0x7ede8224):

0x7ede81f8:      0x78200006: 3DSTATE_PS
0x7ede81fc:      0x00000340:    dword 1
0x7ede8200:      0x08080000:    dword 2
0x7ede8204:      0x00000000:    dword 3
0x7ede8208:      0xab000c03:    dword 4
0x7ede820c:      0x00040006:    dword 5
0x7ede8210:      0x00000000:    dword 6
0x7ede8214:      0x000003c0:    dword 7
0x7ede8218:      0x780f0000: 3DSTATE_SCISSOR_POINTERS
0x7ede821c:      0x00007dc0:    scissor rect offset
0x7ede8220:      0x79000002: 3DSTATE_DRAWING_RECTANGLE
0x7ede8224:      0x00000000:    top left: 0,0
0x7ede8228:      0x059f09ff:    bottom right: 2559,1439
0x7ede822c:      0x00000000:    origin: 0,0
0x7ede8230:      0x78080003: 3DSTATE_VERTEX_BUFFERS
0x7ede8234:      0x00014010:    buffer 0: sequential, pitch 16b
0x7ede8238:      0x7edd8000:    buffer address
0x7ede823c:      0x7edd8041:    max index
0x7ede8240:      0x00000000:    mbz

I was indeed using a somewhat-old Mesa, master commit 74b02a744913ffaaf409feb0df30aaa92188e250 from 2016-09-27.

I will also upgrade to the latest linux-git if it can help.

Please test a new version of Mesa (12 or 13) and mark as REOPENED
if you can reproduce and RESOLVED/* if you cannot reproduce.

Dear Reporter,

This Mesa bug has been in the "NEEDINFO" status for over 60 days. I am closing this bug based on lack of response but feel free to reopen if resolution is still needed. Please ensure you're supplying the correct information as requested.

Thank you.