Bug 99134

Summary:	REGRESSION: Intermittent hang on login kernel 4.10-pre-rc1
Product:	DRI	Reporter:	Greg White <gwhite>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED DUPLICATE	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	major
Priority:	high	CC:	intel-gfx-bugs, przanoni
Version:	DRI git
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Greg White 2016-12-18 00:47:26 UTC

System hard locks intermittently on login.  This is as close as I've been able to get to a backtrace.

Since it is intermittent, I've had no luck getting this bisected.

IF I get past login, everything is fine for the remainder of the session - or at least, I've never had any issues, and I've had some very extended sessions.

Linux 4.9.0-GTW2+ #123 SMP Sat Dec 17 19:39:34 EST 2016 x86_64 GNU/Linux


Dec 17 19:40:10 ringle kernel:  worker_thread+0x4b/0x510
Dec 17 19:40:10 ringle kernel:  kthread+0x101/0x140
Dec 17 19:40:10 ringle kernel:  ? process_one_work+0x450/0x450
Dec 17 19:40:10 ringle kernel:  ? kthread_create_on_node+0x40/0x40
Dec 17 19:40:10 ringle kernel:  ret_from_fork+0x2a/0x40
Dec 17 19:40:10 ringle kernel: Code: ff ff ff 74 58 48 8d 7d c0 44 89 ea 4c 89 e6 e8 1d 36 ff ff 48 8b 43 08 48 8d 55 c0 48 89 df 48 8d b0 80 37 00 00 e8 c6 2e fc ff <48> 8b 50 78 48 85 d2 74 04 83 6a 20 01 48 89 c7 e8 41 71 fc ff 
Dec 17 19:40:10 ringle kernel: RIP: intel_unpin_fb_obj+0x5a/0xb0 RSP: ffffc90003483dd8
Dec 17 19:40:10 ringle kernel: CR2: 0000000000000078
Dec 17 19:40:10 ringle kernel: ---[ end trace 54f93fd89be4561f ]---

Comment 1 Paulo Zanoni 2016-12-19 11:39:48 UTC

I can reproduce this. I reported this on IRC on Dec 07.

The BUG() seems to be in this line:
lockdep_assert_held(&vma->obj->base.dev->struct_mutex);

What I got as answers were "just the messenger" and "there's a few bug reports with trying to unpin an absent vma".

Comment 2 Paulo Zanoni 2016-12-19 11:41:14 UTC

Changing to High since this freezes the machine while logging in.

Comment 3 Chris Wilson 2016-12-20 13:20:45 UTC


*** This bug has been marked as a duplicate of bug 98829 ***

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