[Bug 104982] New: [IGT][CNL Only] igt at debugfs_test@read_all_entries dmesg-warn WARN_ON_ONCE(mcr & ((((3) & 3) << 26) | (((3) & 3) << 24)))

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104982

            Bug ID: 104982
           Summary: [IGT][CNL Only] igt at debugfs_test@read_all_entries
                    dmesg-warn WARN_ON_ONCE(mcr & ((((3) & 3) << 26) |
                    (((3) & 3) << 24)))
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: elizabethx.de.la.torre.mena at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This warning have been appearing in FF with commits badc039+ and 4244f98+,
once with test igt at gem_ringfill@basic-default-hang and commit badc039+,

IGT-Version: 1.21-g37bd27f (x86_64) (Linux:
4.15.0-drm-intel-qa-ww5-commit-badc039+ x86_64)
Ring size: 153 batches
Subtest basic-default-hang: SUCCESS (10.879s)

and with test igt at debugfs_test@read_all_entries with the both mentioned:

IGT-Version: 1.21-g37bd27f (x86_64) (Linux:
4.15.0-drm-intel-qa-ww5-commit-4244f98+ x86_64)
Subtest read_all_entries: SUCCESS (1.308s)

[  156.394252] ------------[ cut here ]------------
[  156.394254] WARN_ON_ONCE(mcr & ((((3) & 3) << 26) | (((3) & 3) << 24)))
[  156.394372] WARNING: CPU: 2 PID: 2633 at
drivers/gpu/drm/i915/intel_engine_cs.c:757
intel_engine_get_instdone+0x39c/0x3f0 [i915]
[  156.394374] Modules linked in: 8250_dw snd_hda_codec_hdmi asix usbnet mii
cmac ip6table_filter ip6_tables bnep iptable_filter binfmt_misc nls_iso8859_1
snd_soc_skl snd_soc_skl_ipc snd_soc_sst_ipc snd_soc_sst_dsp snd_hda_ext_core
x86_pkg_temp_thermal snd_soc_acpi intel_powerclamp snd_soc_core
snd_hda_codec_realtek coretemp snd_hda_codec_generic snd_compress
snd_pcm_dmaengine kvm_intel ac97_bus kvm irqbypass crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel pcbc snd_hda_intel snd_hda_codec snd_hda_core
snd_hwdep snd_pcm aesni_intel aes_x86_64 snd_seq_midi snd_seq_midi_event
crypto_simd glue_helper snd_rawmidi cryptd snd_seq snd_seq_device snd_timer snd
wmi_bmof serio_raw input_leds shpchp iwlwifi btusb btrtl btbcm idma64 soundcore
virt_dma btintel bluetooth intel_lpss_pci intel_lpss ecdh_generic cfg80211
[  156.394445]  intel_pch_thermal tpm_crb mac_hid acpi_pad parport_pc ppdev lp
parport ip_tables x_tables autofs4 hid_generic usbhid hid i915 e1000e ptp
pps_core wmi video
[  156.394469] CPU: 2 PID: 2633 Comm: debugfs_test Tainted: G     U          
4.15.0-drm-intel-qa-ww6-commit-078873d+ #1
[  156.394471] Hardware name: Intel Corporation CannonLake Client
Platform/CannonLake Y LPDDR4 RVP, BIOS CNLSFWR1.R00.X122.B01.1801151045
01/15/2018
[  156.394535] RIP: 0010:intel_engine_get_instdone+0x39c/0x3f0 [i915]
[  156.394537] RSP: 0018:ffffa1f10342fcb0 EFLAGS: 00010086
[  156.394540] RAX: 0000000000000000 RBX: ffff8c0dd9478000 RCX:
ffffffffab257dc8
[  156.394542] RDX: 0000000000000001 RSI: 0000000000000096 RDI:
0000000000000002
[  156.394544] RBP: ffffa1f10342fd48 R08: 000000000000003b R09:
0000000000000a95
[  156.394546] R10: 00000000ffffffff R11: 0000000000000a95 R12:
0000000000000001
[  156.394548] R13: 0000000000000000 R14: 0000000000000001 R15:
0000000011000000
[  156.394551] FS:  00007fa5dd020a00(0000) GS:ffff8c0def900000(0000)
knlGS:0000000000000000
[  156.394553] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  156.394555] CR2: 00007f331bacb9a4 CR3: 0000000259dda005 CR4:
0000000000660ee0
[  156.394558] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  156.394560] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[  156.394561] PKRU: 55555554
[  156.394562] Call Trace:
[  156.394616]  i915_hangcheck_info+0x10e/0x400 [i915]
[  156.394626]  ? create_object+0x24e/0x300
[  156.394634]  seq_read+0x9d/0x410
[  156.394642]  full_proxy_read+0x4a/0x70
[  156.394647]  __vfs_read+0x33/0x160
[  156.394652]  vfs_read+0x8e/0x130
[  156.394657]  SyS_read+0x52/0xc0
[  156.394665]  entry_SYSCALL_64_fastpath+0x24/0x87
[  156.394668] RIP: 0033:0x7fa5dbf2e690
[  156.394670] RSP: 002b:00007fff21134c48 EFLAGS: 00000246
[  156.394673] Code: 0d fe ff ff 80 3d 69 b8 16 00 00 0f 85 93 fe ff ff 48 c7
c6 38 20 48 c0 48 c7 c7 31 c4 46 c0 c6 05 4e b8 16 00 01 e8 84 b9 cd e9 <0f> ff
e9 72 fe ff ff 80 3d 3b b8 16 00 00 0f 85 51 ff ff ff 48 
[  156.394740] ---[ end trace 489fff2b714cdf7d ]---

I'll update logs as soon as I'm able to replicate.

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