FYI, we noticed the following commit: https://github.com/0day-ci/linux John-C-Harrison-Intel-com/Convert-requests-to-use-struct-fence/20160616-210317 commit 1c5965229369400cc1cfe7d40d943c626fd915c6 ("drm/i915: Interrupt driven fences") in testcase: piglit with following parameters: group=igt-basic on test machine: lkp-skl-d01: 8 threads Skylake with 8G memory caused below changes: [ 245.257924] gem_exec_parallel: executing <14> [ 245.265282] gem_exec_parallel: starting subtest basic <3>[ 250.566231] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... render ring idle <3>[ 256.565738] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... blitter ring idle <14> [ 259.559234] gem_exec_parallel: exiting, ret=0 <14> [ 260.468018] gem_exec_basic: executing <14> [ 260.475297] gem_exec_basic: starting subtest basic-render <14> [ 260.482836] gem_exec_basic: exiting, ret=0 <14> [ 261.208392] gem_sync: executing <14> [ 261.215271] gem_sync: starting subtest basic-all <3>[ 266.564774] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... render ring idle <3>[ 272.564241] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... blitter ring idle <14> [ 272.820664] gem_sync: exiting, ret=99 <3>[ 278.547782] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer elapsed... render ring idle <14> [ 279.304155] kms_addfb_basic: executing <14> [ 279.309952] kms_addfb_basic: starting subtest addfb25-framebuffer-vs-set-tiling To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml Thanks, Xiaolong