[Bug 100770] New: [BDW][EXT] igt at kms_fbcon_fbt@fbc-suspend cause the following kms_flip tests to fail on consecutive runs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100770

            Bug ID: 100770
           Summary: [BDW][EXT] igt at kms_fbcon_fbt@fbc-suspend cause the
                    following kms_flip tests to fail on consecutive runs
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: marta.lofstedt at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

While consecutively running the extended list I have noticed that the kms_flip
subtests following igt at kms_flip@bo-too-big, are failing on my BDW NUCi5. When
this happens I typically get vblank time out as below: 


"[ 6408.016000] WARNING: CPU: 2 PID: 8961 at
drivers/gpu/drm/i915/intel_display.c:12616
intel_atomic_commit_tail+0x1028/0x1030 [i915]
[ 6408.016002] pipe B vblank wait timed out
[ 6408.016003] Modules linked in: rfcomm bnep arc4 iwlmvm binfmt_misc
nls_iso8859_1 intel_rapl x86_pkg_temp_thermal intel_powerclamp mac80211
coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel
snd_hda_codec_hdmi snd_soc_ssm4567 aes_x86_64 iwlwifi crypto_simd cryptd
glue_helper snd_soc_rt5640 snd_hda_codec_realtek snd_soc_rl6231 snd_soc_core
snd_hda_codec_generic intel_cstate cfg80211 snd_hda_intel snd_hda_codec
snd_compress snd_seq_midi snd_seq_midi_event intel_rapl_perf btusb snd_hda_core
btrtl btbcm btintel input_leds snd_rawmidi bluetooth snd_pcm mei_me snd_seq
lpc_ich mei snd_hwdep shpchp snd_timer snd_seq_device acpi_als ir_lirc_codec
snd lirc_dev rc_rc6_mce elan_i2c kfifo_buf nuvoton_cir soundcore 8250_dw
rc_core acpi_pad i2c_designware_platform industrialio mac_hid dw_dmac
[ 6408.016048]  snd_soc_sst_acpi i2c_designware_core snd_soc_sst_match
spi_pxa2xx_platform parport_pc ppdev lp parport ip_tables x_tables autofs4 i915
hid_generic usbhid i2c_algo_bit drm_kms_helper syscopyarea sysfillrect
sysimgblt fb_sys_fops drm e1000e ahci ptp libahci pps_core sdhci_acpi sdhci
i2c_hid hid video
[ 6408.016070] CPU: 2 PID: 8961 Comm: kms_flip Tainted: G     U  W      
4.11.0-rc7+ #33
[ 6408.016071] Hardware name:                  /NUC5i5RYB, BIOS
RYBDWi35.86A.0249.2015.0529.1640 05/29/2015
[ 6408.016072] Call Trace:
[ 6408.016079]  dump_stack+0x63/0x81
[ 6408.016082]  __warn+0xcb/0xf0
[ 6408.016085]  warn_slowpath_fmt+0x5a/0x80
[ 6408.016117]  intel_atomic_commit_tail+0x1028/0x1030 [i915]
[ 6408.016120]  ? wake_atomic_t_function+0x60/0x60
[ 6408.016147]  intel_atomic_commit+0x3b7/0x4c0 [i915]
[ 6408.016149]  ? wake_atomic_t_function+0x60/0x60
[ 6408.016166]  drm_atomic_commit+0x4b/0x50 [drm]
[ 6408.016175]  drm_atomic_helper_set_config+0x80/0xc0 [drm_kms_helper]
[ 6408.016188]  __drm_mode_set_config_internal+0x65/0x110 [drm]
[ 6408.016200]  drm_mode_setcrtc+0x4f1/0x660 [drm]
[ 6408.016212]  drm_ioctl+0x218/0x4b0 [drm]
[ 6408.016222]  ? drm_mode_getcrtc+0x180/0x180 [drm]
[ 6408.016226]  ? kmem_cache_free+0x1b6/0x1e0
[ 6408.016230]  do_vfs_ioctl+0xa3/0x600
[ 6408.016233]  SyS_ioctl+0x79/0x90
[ 6408.016236]  entry_SYSCALL_64_fastpath+0x1e/0xad
[ 6408.016237] RIP: 0033:0x7fcdeaa658b7
[ 6408.016239] RSP: 002b:00007ffe58ce8838 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 6408.016241] RAX: ffffffffffffffda RBX: 000056111e4fa80c RCX:
00007fcdeaa658b7
[ 6408.016242] RDX: 00007ffe58ce8870 RSI: 00000000c06864a2 RDI:
0000000000000003
[ 6408.016243] RBP: 000056111e4fbd90 R08: 0000000000000000 R09:
00007ffe58ce8d28
[ 6408.016244] R10: 00007ffe58ce8bd4 R11: 0000000000000246 R12:
00007ffe58ce1670
[ 6408.016245] R13: 00000000000005df R14: 00007ffe58ce1560 R15:
0000000000000000
[ 6408.016247] ---[ end trace 0491a6d0dd9e81a4 ]---
[ 6418.127974] [drm:drm_atomic_helper_commit_cleanup_done [drm_kms_helper]]
*ERROR* [CRTC:39:pipe B] flip_done timed out"

However, if I remove the kms_fbcon_fbt subtest fbc-suspend the kms_flip thest
are fine.

I am currently running drm-tip git at bc781a3cf, but judging from extended results
from farm2 BDWs this has been going on for quite a while.

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