[Wayland-bugs] [Bug 59001] [Wayland] queue-test test failed on ppc64

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59001

--- Comment #11 from Philip Withnall <bugzilla at tecnocode.co.uk> ---
Most likely this:
http://lists.freedesktop.org/archives/wayland-devel/2013-February/007275.html.

Copied for posterity:

Around line 740 of connection.c, demarshalling an object:

        id = (uint32_t **) extra;
        extra += sizeof *id;
        closure->args[i] = id;
        *id = p;

On 64-bit MIPS, the assignment to *id gets turned into a
store-double-word instruction (since pointer 'p' is 64 bits wide), which
must be to a 8-byte-aligned address. It's possible for 'extra' to not be
8-byte aligned, and hence for the store to not be aligned.

In the particular case I'm hitting, 'extra' is not 8-byte-aligned
because the message size is 12, but it also looks like alignment could
be changed in other ways; e.g. during handling a 'h'-type argument near
the bottom of the function, where 'extra' is incremented by the size of
an int.

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