[Bug 106721] New: [i915] Linux machine hanged after several reboots

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106721

            Bug ID: 106721
           Summary: [i915] Linux machine hanged after several reboots
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ccalderon at elitegrupo.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139847
  --> https://bugs.freedesktop.org/attachment.cgi?id=139847&action=edit
user log during the reboot test

Tested with Ubuntu (4.16, 4.18) and Ubilinux3 and 4 (Debian) distros and
multiple kernel versions (from 4.4 to 4.15) on UP board machines.

In all cases, the issue is the same. After several software reboots (in most of
the cases less than 100 reboots) the UP machine hangs and is blocked. So, it is
impossible to use but disconnecting the power wire.

Using an FTDI connector to use the UART transmitter, some ERROR messages were
found in the exact moment where machine hangs.
All the ERROR are on line with the i915 module of DRM used in the GPU.

After disabling all modules for i915 in the kernel configuration file and
rebuild the full kernel and test again, with more than 1000 reboots, the UP
machine continues working properly. That test was used in Ubuntu and Ubilinux
(Debian).

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