https://bugs.kde.org/show_bug.cgi?id=429967
--- Comment #4 from Vlad Zahorodnii <vlad.zahorod...@kde.org> ---
mmap() can fail with EINVAL in the following cases
EINVAL We don't like addr, length, or offset (e.g., they are too
large, or not aligned on a page boundary).
EINVAL (since Linux 2.6.12) length was 0.
EINVAL flags contained none of MAP_PRIVATE, MAP_SHARED, or
MAP_SHARED_VALIDATE.
The relevant code in qwaylandshmbackingstore.cpp
uchar *data = (uchar *)
mmap(nullptr, alloc, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
so, it's most likely that the specified length is either 0 or it exceeds the
limits. It's hard to say without being able to reproduce the bug.
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