Hello, The following tests are falling on KBL with latest configuration, now with an assertion

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test list 
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igt@gem_reloc_vs_gpu@forked-hang
igt@gem_reloc_vs_gpu@forked-interruptible-thrashing-hang

(gem_reloc_vs_gpu:1442) intel-batchbuffer-CRITICAL: Test assertion failure function intel_batchbuffer_flush_on_ring, file intel_batchbuffer.c:184:
(gem_reloc_vs_gpu:1442) intel-batchbuffer-CRITICAL: Failed assertion: (drm_intel_gem_bo_context_exec(batch->bo, ctx, used, ring)) == 0
(gem_reloc_vs_gpu:1442) intel-batchbuffer-CRITICAL: Last errno: 5, Input/output error
Stack trace:
(gem_reloc_vs_gpu:1446) intel-batchbuffer-CRITICAL: Failed assertion: (drm_intel_gem_bo_context_exec(batch->bo, ctx, used, ring)) == 0
(gem_reloc_vs_gpu:1446) intel-batchbuffer-CRITICAL: Last errno: 5, Input/output error
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #0 [__igt_fail_assert+0x101]
  #0 [__igt_fail_assert+0x101]
  #0 [__igt_fail_assert+0x101]
  #1 [intel_batchbuffer_flush_on_ring+0xc7]
  #1 [intel_batchbuffer_flush_on_ring+0xc7]
  #1 [intel_batchbuffer_flush_on_ring+0xc7]
  #1 [intel_batchbuffer_flush_on_ring+0xc7]
  #2 [do_test+0x464]
  #2 [do_test+0x464]
  #2 [do_test+0x464]
  #2 [do_test+0x464]
  #3 [__real_main296+0x4e6]
  #3 [__real_main296+0x4e6]
  #3 [__real_main296+0x4e6]
  #3 [__real_main296+0x4e6]
  #4 [main+0x33]
  #4 [main+0x33]
  #4 [main+0x33]
  #4 [main+0x33]
  #5 [__libc_start_main+0xf1]
  #5 [__libc_start_main+0xf1]
  #5 [__libc_start_main+0xf1]
  #5 [__libc_start_main+0xf1]
  #6 [_start+0x29]
  #6 [_start+0x29]
  #6 [_start+0x29]
  #6 [_start+0x29]
  #7 [<unknown>+0x29]
  #7 [<unknown>+0x29]
  #7 [<unknown>+0x29]
  #7 [<unknown>+0x29]
child 2 failed with exit status 99
Subtest forked-hang failed.
**** DEBUG ****
(gem_reloc_vs_gpu:1428) ioctl-wrappers-DEBUG: Test requirement passed: gem_has_ring(fd, ring)
(gem_reloc_vs_gpu:1428) ioctl-wrappers-DEBUG: Test requirement passed: has_ban_period || has_bannable
(gem_reloc_vs_gpu:1428) igt-gt-DEBUG: Test requirement passed: has_gpu_reset(fd)
****  END  ****

attached new dmesg