[Bug 100858] New: [SNB] igt at drv_module_reload@basic-reload-final fails and hard hangs the system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100858

            Bug ID: 100858
           Summary: [SNB] igt at drv_module_reload@basic-reload-final fails
                    and hard hangs the system
           Product: DRI
           Version: XOrg 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: krisman at collabora.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

When running igt at drv_module_reload@basic-reload-final, the first iteration hits
an assertion failure and any further invocation will hard hang the system. 
Network connection is lost, no console output, etc.  I'm trying to collect a
crash dump next.

This might be two separate issues, but until confirmed, I think they should be
considered related and handled together.  The output of the 2 subsequent
invocations:

root at collab-x220:~/work/igt-gpu-tools# tests/drv_module_reload --run-subtest
basic-reload-final --debug
IGT-Version: 1.18-g8039c0ef6e51 (x86_64) (Linux: 4.11.0-rc8.intel-boxes+
x86_64)
(drv_module_reload:1181) igt-core-DEBUG: Starting subtest: basic-reload-final
(drv_module_reload:1181) igt-kmod-DEBUG: Could not remove module drm_kms_helper
(No such file or directory)
(drv_module_reload:1181) igt-kmod-DEBUG: Could not remove module drm (No such
file or directory)
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) CRITICAL: Test assertion failure function store_dword,
file drv_module_reload.c:111:
(drv_module_reload:1181) CRITICAL: Failed assertion: *batch == 0xc0ffee
(drv_module_reload:1181) CRITICAL: error: 0 != 12648430
Stack trace:
  #0 [__igt_fail_assert+0x16e]
  #1 [store_dword+0x35d]
  #2 [gem_exec_store+0x48]
  #3 [__real_main308+0x1e0]
  #4 [main+0x49]
  #5 [__libc_start_main+0xf1]
  #6 [_start+0x2a]
  #7 [<unknown>+0x2a]
Subtest basic-reload-final failed.
**** DEBUG ****
(drv_module_reload:1181) igt-kmod-DEBUG: Could not remove module drm_kms_helper
(No such file or directory)
(drv_module_reload:1181) igt-kmod-DEBUG: Could not remove module drm (No such
file or directory)
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) igt-debugfs-DEBUG: Opening debugfs directory
'/sys/kernel/debug/dri/0'
(drv_module_reload:1181) CRITICAL: Test assertion failure function store_dword,
file drv_module_reload.c:111:
(drv_module_reload:1181) CRITICAL: Failed assertion: *batch == 0xc0ffee
(drv_module_reload:1181) CRITICAL: error: 0 != 12648430
****  END  ****
Subtest basic-reload-final: FAIL (1.584s)
(drv_module_reload:1181) igt-core-DEBUG: Exiting with status code 99
root at collab-x220:~/work/igt-gpu-tools# tests/drv_module_reload --run-subtest
basic-reload-final --debug
IGT-Version: 1.18-g8039c0ef6e51 (x86_64) (Linux: 4.11.0-rc8.intel-boxes+
x86_64)
(drv_module_reload:1200) igt-core-DEBUG: Starting subtest: basic-reload-final

^C

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