https://bugs.kde.org/show_bug.cgi?id=512968

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|flickering on external      |after commit 03f77c
                   |screen after commit         |flickering on external
                   |03f77cf9e7041d4eeefc7c9da9d |screen and when atomic
                   |e4ee7284c9920               |modeset is disabled, kwin
                   |                            |crashes

--- Comment #5 from [email protected] ---
The more serious issue seems be that after this commit, when I disable atomic
mode setting (`KWIN_DRM_NO_AMS=1`), kwin consistently crashes.

(I tested both on master, consistent crash, and with the commit reverted,
consistent crash)

For full backtrace, see attachment. The issue seems to be
`gpu->m_defunctCommits` becomes corrupted at
kwin/src/backends/drm/drm_gpu.cpp:544
(https://invent.kde.org/plasma/kwin/-/blob/1b4896c218dd705742dcd091665db27702c3525d/src/backends/drm/drm_gpu.cpp#L544)

> +p gpu->m_defunctCommits 
> $1 = std::vector of length -137438961664, capacity -137438961625 = {Cannot 
> access memory at address 0x10000010000

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