[Bug 83868] [all Regression]igt/drv_module_reload causes "WARNING: CPU: 5 PID: 3993 at drivers/gpu/drm/i915/i915_irq.c:154 ironlake_disable_vblank+0x40/0x52 [i915]()"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83868

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[SNB/HSW                    |[all
                   |Regression]igt/drv_module_r |Regression]igt/drv_module_r
                   |eload causes "WARNING: CPU: |eload causes "WARNING: CPU:
                   |5 PID: 3993 at              |5 PID: 3993 at
                   |drivers/gpu/drm/i915/i915_i |drivers/gpu/drm/i915/i915_i
                   |rq.c:154                    |rq.c:154
                   |ironlake_disable_vblank+0x4 |ironlake_disable_vblank+0x4
                   |0/0x52 [i915]()"            |0/0x52 [i915]()"

--- Comment #1 from lu hua <huax.lu at intel.com> ---
It impacts all platforms.
[   33.023954] Call Trace:
[   33.023957]  [<ffffffff81841018>] dump_stack+0x46/0x58
[   33.023959]  [<ffffffff81074ccc>] ? down_trylock+0x2c/0x37
[   33.023961]  [<ffffffff8183d0fb>] print_circular_bug+0x2ad/0x2be
[   33.023962]  [<ffffffff81078fa1>] __lock_acquire+0x10ac/0x1803
[   33.023963]  [<ffffffff81079c08>] lock_acquire+0xd3/0x10d
[   33.023964]  [<ffffffff81433435>] ? store_bind+0x1f0/0x221
[   33.023965]  [<ffffffff8107a43e>] ? trace_hardirqs_on+0xd/0xf
[   33.023966]  [<ffffffff8108550d>] console_lock+0x41/0x60
[   33.023967]  [<ffffffff81433435>] ? store_bind+0x1f0/0x221
[   33.023969]  [<ffffffff8139efca>] ? simple_strtoul+0x9/0xb
[   33.023970]  [<ffffffff81433435>] store_bind+0x1f0/0x221
[   33.023971]  [<ffffffff81450034>] dev_attr_store+0x18/0x24
[   33.023973]  [<ffffffff811a7f4b>] sysfs_kf_write+0x4a/0x52
[   33.023974]  [<ffffffff811a71e0>] kernfs_fop_write+0xe9/0x132
[   33.023975]  [<ffffffff81143248>] vfs_write+0xbe/0x19a
[   33.023977]  [<ffffffff81143552>] SyS_write+0x4a/0x91
[   33.023978]  [<ffffffff81848712>] system_call_fastpath+0x12/0x17
[   33.024031] Console: switching to colour dummy device 80x25
[   33.063395] drm_kms_helper: drm: unregistered panic notifier
[   33.081080] ------------[ cut here ]------------
[   33.081102] WARNING: CPU: 0 PID: 3726 at drivers/gpu/drm/i915/i915_irq.c:154
ironlake_disable_display_irq+0x36/0x77 [i915]()

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