Bug 100247

Summary: [BAT][SNB] Warn on igt@gem_ctx_create@basic-files in CI
Product: DRI Reporter: Martin Peres <martin.peres>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: critical    
Priority: highest CC: intel-gfx-bugs
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: SNB i915 features: GEM/Other

Description Martin Peres 2017-03-17 10:28:09 UTC 
Got the following trace when running igt@gem_ctx_create@basic-files on fi-snb-2520m with CI_DRM_2355:

[   99.153133] ------------[ cut here ]------------
[   99.153193] WARNING: CPU: 1 PID: 7165 at drivers/gpu/drm/i915/intel_uncore.c:232 __gen6_gt_wait_for_fifo+0xae/0xc0 [i915]
[   99.153195] WARN_ON(loop < 0 && fifo <= 20)
[   99.153197] Modules linked in: x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi coretemp snd_hda_codec_generic crct10dif_pclmul snd_hda_intel crc32_pclmul snd_hda_codec snd_hwdep snd_hda_core ghash_clmulni_intel mei_me snd_pcm mei lpc_ich i915 sdhci_pci sdhci mmc_core e1000e ptp pps_core prime_numbers
[   99.153238] CPU: 1 PID: 7165 Comm: gem_ctx_create Not tainted 4.11.0-rc2-CI-CI_DRM_2355+ #1
[   99.153240] Hardware name: LENOVO 42962WU/42962WU, BIOS 8DET56WW (1.26 ) 12/01/2011
[   99.153242] Call Trace:
[   99.153247]  dump_stack+0x67/0x92
[   99.153252]  __warn+0xc6/0xe0
[   99.153256]  warn_slowpath_fmt+0x4a/0x50
[   99.153279]  __gen6_gt_wait_for_fifo+0xae/0xc0 [i915]
[   99.153299]  gen6_write32+0x189/0x2a0 [i915]
[   99.153319]  i9xx_submit_request+0x3e/0x50 [i915]
[   99.153339]  submit_notify+0x3f/0x5c [i915]
[   99.153355]  __i915_sw_fence_complete+0x176/0x220 [i915]
[   99.153358]  ? debug_object_activate+0xe2/0x1e0
[   99.153375]  i915_sw_fence_complete+0x25/0x40 [i915]
[   99.153391]  i915_sw_fence_commit+0x1c/0x30 [i915]
[   99.153410]  __i915_add_request+0x238/0x540 [i915]
[   99.153430]  i915_gem_do_execbuffer.isra.16+0x157e/0x1b70 [i915]
[   99.153433]  ? __lock_acquire+0x45b/0x1bb0
[   99.153437]  ? __might_fault+0x3e/0x90
[   99.153460]  i915_gem_execbuffer2+0xb5/0x220 [i915]
[   99.153465]  drm_ioctl+0x200/0x450
[   99.153469]  ? __slab_free+0x39f/0x4f0
[   99.153486]  ? i915_gem_execbuffer+0x330/0x330 [i915]
[   99.153492]  ? putname+0x4f/0x60
[   99.153496]  do_vfs_ioctl+0x90/0x6e0
[   99.153499]  ? entry_SYSCALL_64_fastpath+0x5/0xb1
[   99.153503]  ? __this_cpu_preempt_check+0x13/0x20
[   99.153506]  ? trace_hardirqs_on_caller+0xe7/0x200
[   99.153509]  SyS_ioctl+0x3c/0x70
[   99.153513]  entry_SYSCALL_64_fastpath+0x1c/0xb1
[   99.153516] RIP: 0033:0x7f9c60d44357
[   99.153518] RSP: 002b:00007ffc39a15108 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   99.153521] RAX: ffffffffffffffda RBX: ffffffff8147ea93 RCX: 00007f9c60d44357
[   99.153523] RDX: 00007ffc39a151e0 RSI: 0000000040406469 RDI: 0000000000000005
[   99.153525] RBP: ffffc900006dbf88 R08: 0000000000000005 R09: 0000000000000000
[   99.153526] R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
[   99.153528] R13: 0000000000000005 R14: 0000000040406469 R15: 000000000000023d
[   99.153532]  ? __this_cpu_preempt_check+0x13/0x20
[   99.153537] ---[ end trace f5861f5a24c919de ]---

Raw results: https://intel-gfx-ci.01.org/CI/CI_DRM_2355/fi-snb-2520m/igt@gem_ctx_create@basic-files.html
Comment 1 Chris Wilson 2017-03-17 12:45:55 UTC 
The quickest "fix" would be to silence this WARN and just wait for the fifodbg to spot the undeflow instead.
Comment 2 Martin Peres 2017-03-23 11:17:30 UTC 
Failure rate 1/31 run(s) (3%)

Raising the priority as it is seen in CI.
Comment 4 Jani Saarinen 2017-05-02 14:21:44 UTC 
Reference to Mika's patch: https://lists.freedesktop.org/archives/intel-gfx/2017-May/126990.html
Comment 5 Mika Kuoppala 2017-05-03 12:34:57 UTC 
The warn has been disabled and gt fifo overflow (reporting) is now
handled in the mmio_debug path.

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