[Bug 102161] New: [i915] System freeze - timeout in intel_mmio_flip_work_func

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=102161

            Bug ID: 102161
           Summary: [i915] System freeze - timeout in
                    intel_mmio_flip_work_func
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.2.0-040200rc4-generic
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rocket2dmn at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 184071
  --> https://bugzilla.kernel.org/attachment.cgi?id=184071&action=edit
dmesg with timeout

I've been testing the latest kernel to see if an issue with my wireless is
fixed. Hardware is a Lenovo Thinkpad X1 Carbon 3rd Gen. Further hardware
details available at the downstream wireless bug report [1].

[1] https://bugs.launchpad.net/bugs/1478754

cimes at lappy64-x1c:~$ lsb_release -rd
Description:    Ubuntu 15.04
Release:    15.04
cimes at lappy64-x1c:~$ uname -a
Linux lappy64-x1c 4.2.0-040200rc4-generic #201507271733 SMP Mon Jul 27 21:35:06
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

System is now sometimes freezing up trying to open a new window during
development testing of Mozilla's servo web browser engine.  Output of dmesg
captured from ssh session is attached (had to wait a few minutes for the
timeout to show up). Here is the application backtrace as well as captured in
gdb:

#0  0x00007f837af3d0b7 in ioctl () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f8378a177e8 in drmIoctl ()
   from /usr/lib/x86_64-linux-gnu/libdrm.so.2
#2  0x00007f837664de9c in drm_intel_gem_bo_start_gtt_access ()
   from /usr/lib/x86_64-linux-gnu/libdrm_intel.so.1
#3  0x00005634d7de5183 in window::Window::new::haba041c2f46fbd05Rxa ()
#4  0x00005634d7cecb52 in main::h0c62f9eb269d2dd5raa ()
#5  0x00005634d9266ff9 in rust_try_inner ()
#6  0x00005634d9266fe6 in rust_try ()
#7  0x00005634d9263b79 in rt::lang_start::h6c59a9adbeceea29z5w ()
#8  0x00007f837ae60a40 in __libc_start_main (main=0x5634d7d4db90 <main>, 
    argc=6, argv=0x7ffe6b853658, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7ffe6b853648) at libc-start.c:289
#9  0x00005634d7cec649 in _start ()

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