Starting at:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_3872/fi-kbl-7560u/igt@gem_exec_suspend@basic-s3.html

and so far all consecutive runs. Note this is not happening on any other KBL in the lab.

run.log:
running: igt/gem_exec_suspend/basic-s3

[107/288] skip: 3, pass: 104 \        
FATAL: command execution failed
...
Completed CI_IGT_test CI_DRM_3872/fi-kbl-7560u/0 : FAILURE
CI_IGT_test runtime 206 seconds
Rebooting fi-kbl-7560u

Last dmesg:
<7>[  189.823982] [IGT] gem_exec_suspend: executing
<4>[  189.828067] Setting dangerous option reset - tainting kernel
<7>[  189.828830] [IGT] gem_exec_suspend: starting subtest basic-S3
<7>[  189.829365] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  189.829385] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<7>[  189.920934] [drm:intel_power_well_disable [i915]] disabling DC off
<7>[  189.920976] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7>[  189.920998] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<7>[  189.937373] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  189.937393] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<7>[  190.024929] [drm:intel_power_well_disable [i915]] disabling DC off
<7>[  190.024956] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7>[  190.024975] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<7>[  190.041612] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  190.041632] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<7>[  190.128970] [drm:intel_power_well_disable [i915]] disabling DC off
<7>[  190.128998] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7>[  190.129057] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<7>[  190.147610] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  190.147632] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<7>[  190.240924] [drm:intel_power_well_disable [i915]] disabling DC off
<7>[  190.240951] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7>[  190.240971] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<7>[  190.251365] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  190.251385] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00
<7>[  190.339678] [drm:intel_power_well_disable [i915]] disabling DC off
<7>[  190.339705] [drm:skl_enable_dc6 [i915]] Enabling DC6
<7>[  190.339725] [drm:gen9_set_dc_state [i915]] Setting DC state from 00 to 02
<7>[  190.357506] [drm:intel_power_well_enable [i915]] enabling DC off
<7>[  190.357525] [drm:gen9_set_dc_state [i915]] Setting DC state from 02 to 00