[Bug 110969] i915 0000:00:02.0: GPU HANG: ecode 7:1:0xfffffffe, in Xwayland [10802], hang on rcs0

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110969

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
rcs0 command stream:
  IDLE?: no
  START: 0x00001000
  HEAD:  0x30813250 [0x00013228]
  TAIL:  0x000134c8 [0x000132e0, 0x00013308]
  CTL:   0x0001f001
  MODE:  0x00004000
  HWS:   0x7fffe000
  ACTHD: 0x00000000 30813250
  IPEIR: 0x00000000
  IPEHR: 0x79120000
  INSTDONE: 0xffffbff8
  SC_INSTDONE: 0xfffffffe
  SAMPLER_INSTDONE[0][0]: 0xffffffff
  ROW_INSTDONE[0][0]: 0xffffffff
  batch: [0x00000000_7fff8000, 0x00000000_7fff9000]
  BBADDR: 0x00000000_7fff1740
  BB_STATE: 0x00000000
  INSTPS: 0x00000501
  INSTPM: 0x00000080
  FADDR: 0x00000000 00014250
  RC PSMI: 0x00000010
  FAULT_REG: 0x00000000
  SYNC_0: 0x00000000
  SYNC_1: 0x00000000
  GFX_MODE: 0x00002a00
  PP_DIR_BASE: 0x7f9f0000
...
0x0001422c:      0x00002220:    dword 1
0x00014230:      0xffffffff:    dword 2
0x00014234:      0x11000001: MI_LOAD_REGISTER_IMM
0x00014238:      0x00002228:    dword 1
0x0001423c:      0x7f9f0000:    dword 2
0x00014240:      0x04000000: MI_ARB_ON_OFF
0x00014244:      0x00000000: MI_NOOP
0x00014248:      0x0c000000: MI_SET_CONTEXT
0x0001424c:      0x7fff010c:    gtt offset = 0x7fff0000
0x00014250:      0x00000000: MI_NOOP
0x00014254:      0x04000001: MI_ARB_ON_OFF
0x00014258:      0x7a000002: PIPE_CONTROL
0x0001425c:      0x00100002:    no write, cs stall, stall at scoreboard, 
0x00014260:      0x00000000:    
0x00014264:      0x00000000:    

Suggests it died in the context restore.

If there is a link with mempressure, we might not keeping the context image
intact over paging.

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