[Bug 103712] [CI] igt@* - incomplete - timeout/Softdog - *ERROR* [CRTC:37:pipe A] flip_done timed out - WARNING: CPU: 7 PID: 2601 at drivers/gpu/drm/drm_vblank.c:1071 drm_wait_one_vblank+0x179/0x180

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103712

Maarten Lankhorst <bugs at mblankhorst.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|intel-gfx-bugs at lists.freede |bugs at mblankhorst.nl
                   |sktop.org                   |
             Status|NEW                         |ASSIGNED

--- Comment #30 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
I found the issue on shard-snb7 using blind bisection. No idea why it triggers
yet, can confirm that a merge commit is actually the issue here..

first bad commit: [fb0255fb2941ef6f21742b2bc146d6b9aef4fedc] Merge tag
'tty-4.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Minimal testcase:
Compile kernel with debug_kernel.config

BUT, when I compile with all compile options enabled including KASAN it passes.
With just KASAN disabled I get the vblank wait timeout.

One thing I do find curious is DPM_WATCHDOG and device resume before image is
even written..

Added
CONFIG_GENERIC_IRQ_DEBUGFS=y and found this for the i915 irq:

>From /proc/interrupts:
 28:        562          0          0          0         28          0         
0          0   PCI-MSI 32768-edge      i915

Vector: 33


This confirms that the do_IRQ is failing because irq 28 is not sent to the
driver, explaining everything breaking.

Recall from the dmesg log:
<0>[  894.599830] do_IRQ: 4.33 No irq handler for vector

Reverting
commit b18d62891aaff49d0ee8367d4b6bb9452469f807
Merge: 7d58e1c9059e 141d3b1daacd
Author: Linus Torvalds <torvalds at linux-foundation.org>
Date:   Mon Nov 13 18:29:23 2017 -0800

    Merge branch 'x86-apic-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Makes the thing work again..

Lets see if the error occurs when I bisect from there..

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