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<body><span class="vcard"><a class="email" href="mailto:bugs@mblankhorst.nl" title="Maarten Lankhorst <bugs@mblankhorst.nl>"> <span class="fn">Maarten Lankhorst</span></a>
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<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103712">bug 103712</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Assignee</td>
<td>intel-gfx-bugs@lists.freedesktop.org
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<td>bugs@mblankhorst.nl
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<td style="text-align:right;">Status</td>
<td>NEW
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<td>ASSIGNED
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<b><a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103712#c30">Comment # 30</a>
on <a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [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"
href="https://bugs.freedesktop.org/show_bug.cgi?id=103712">bug 103712</a>
from <span class="vcard"><a class="email" href="mailto:bugs@mblankhorst.nl" title="Maarten Lankhorst <bugs@mblankhorst.nl>"> <span class="fn">Maarten Lankhorst</span></a>
</span></b>
<pre>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 <<a href="mailto:torvalds@linux-foundation.org">torvalds@linux-foundation.org</a>>
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..</pre>
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