Bug 101901

Summary:

[BAT][GVT-d] igt@debugfs_test@read_all_entries produces dmesg warnings

Product:

DRI

Reporter:

Martin Peres <martin.peres>

Component:

DRM/Intel

Assignee:

krisman

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:

ReadyForDev

i915 platform:

BDW, SKL

i915 features:

Attachments:

Description	Flags
proposed fix	none

Description Martin Peres 2017-07-24 16:01:06 UTC

The new test igt@debugfs_test@read_all_entries produces the following dmesg warnings when running on fi-bdw-gvtdvm and fi-skl-gvtdvm:

[   60.626475] unchecked MSR access error: RDMSR from 0x606 at rIP: 0xffffffffa0078f66 (i915_energy_uJ+0x36/0xb0 [i915])
[   60.626482] Call Trace:
[   60.626487]  seq_read+0xdc/0x3a0
[   60.626492]  full_proxy_read+0x4f/0x70
[   60.626496]  __vfs_read+0x23/0x120
[   60.626498]  ? putname+0x4f/0x60
[   60.626502]  ? rcu_read_lock_sched_held+0x75/0x80
[   60.626505]  ? entry_SYSCALL_64_fastpath+0x5/0xb1
[   60.626509]  vfs_read+0xa0/0x150
[   60.626512]  SyS_read+0x44/0xb0
[   60.626515]  entry_SYSCALL_64_fastpath+0x1c/0xb1
[   60.626517] RIP: 0033:0x7f1f5e9f4500
[   60.626519] RSP: 002b:00007ffc77e65cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[   60.626522] RAX: ffffffffffffffda RBX: ffffffff8146e003 RCX: 00007f1f5e9f4500
[   60.626524] RDX: 0000000000000200 RSI: 00007ffc77e65d10 RDI: 0000000000000006
[   60.626526] RBP: ffffc900007abf88 R08: 0000000001eaff20 R09: 0000000000000000
[   60.626527] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   60.626529] R13: 0000000000000006 R14: 0000000000000005 R15: 0000000001eb94db
[   60.626533]  ? __this_cpu_preempt_check+0x13/0x20

Full logs:
 - https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2867/fi-bdw-gvtdvm/igt@debugfs_test@read_all_entries.html
 - https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_2867/fi-skl-gvtdvm/igt@debugfs_test@read_all_entries.html

Comment 1 krisman 2017-07-25 06:42:54 UTC

Created attachment 132946 [details] [review]
proposed fix

fixable by the attached patch.  I'm just waiting on -trybot confirmation before submitting to the list.

Comment 2 Martin Peres 2017-07-25 07:56:23 UTC

(In reply to krisman from comment #1)
> Created attachment 132946 [details] [review] [review]
> proposed fix
> 
> fixable by the attached patch.  I'm just waiting on -trybot confirmation
> before submitting to the list.

For documentation, the proposed fix seems to work: https://patchwork.freedesktop.org/series/27832/

Thanks for the swift fix proposal!

Comment 3 krisman 2017-07-25 18:36:26 UTC

(In reply to Martin Peres from comment #2)
> (In reply to krisman from comment #1)
> > Created attachment 132946 [details] [review] [review] [review]
> > proposed fix
> > 
> > fixable by the attached patch.  I'm just waiting on -trybot confirmation
> > before submitting to the list.

Submitted to intel-gfx. 

https://lists.freedesktop.org/archives/intel-gfx-trybot/2017-July/021872.html

Comment 4 Martin Peres 2017-07-25 20:22:23 UTC

Thanks for sending the patch out! However, please do not close a bug until the issue has been fixed in drm-tip.

Comment 5 Martin Peres 2017-07-26 13:38:39 UTC

(In reply to Martin Peres from comment #4)
> Thanks for sending the patch out! However, please do not close a bug until
> the issue has been fixed in drm-tip.

And now it is pushed, so we can close the bug. Thanks!

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