Greeting,

FYI, we noticed the following commit (built with gcc-9):

commit: 2871b2fde449c2567a2d46a3635356cbc97c9740 ("drm/i915: Fix TGL+ plane SAGV watermark programming")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master


in testcase: igt
version: igt-x86_64-e230cd8d-1_20210106
with following parameters:

	group: group-23
	ucode: 0xe2



on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 28G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):



If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@intel.com>



[  478.797802] Starting subtest: flip-vs-cursor-busy-crc-atomic
[  478.797803]
[  481.223505] [drm:drm_crtc_add_crc_entry [drm]] *ERROR* Overflow of CRC buffer, userspace reads too slow.
[  490.089651] Asynchronous wait on fence 0000:00:02.0:kms_cursor_lega[5657]:2 timed out (hint:intel_atomic_commit_ready [i915])
[  490.106185] [IGT] kms_cursor_legacy: exiting, ret=98
[  490.106939] (kms_cursor_legacy:5657) CRITICAL: Test assertion failure function flip_vs_cursor_busy_crc, file ../tests/kms_cursor_legacy.c:1332:
[  490.111147]
[  490.125753] Console: switching to colour frame buffer device 160x64
[  490.127707] (kms_cursor_legacy:5657) CRITICAL: Failed assertion: kmstest_get_vblank(display->drm_fd, pipe, 0) == vblank_start
[  490.133582]
[  490.147435] (kms_cursor_legacy:5657) CRITICAL: error: 28096 != 27437


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install                job.yaml  # job file is attached in this email
        bin/lkp split-job --compatible job.yaml
        bin/lkp run                    compatible-job.yaml



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang