[Bug 99134] New: REGRESSION: Intermittent hang on login kernel 4.10-pre-rc1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99134

            Bug ID: 99134
           Summary: REGRESSION: Intermittent hang on login kernel
                    4.10-pre-rc1
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: gwhite at kupulau.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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 ]---

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