https://bugs.kde.org/show_bug.cgi?id=446429

Tom Hughes <t...@compton.nu> changed:

           What    |Removed                     |Added
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                 CC|                            |t...@compton.nu

--- Comment #1 from Tom Hughes <t...@compton.nu> ---
Well 0xFB is STI which sets the interrupt flag to enable interrupts which is
presumably a privileged instruction that a user mode program shouldn't be
trying to use.

It seems more likely that you've somehow jumped to a bogus address and are
trying to execute something that isn't a valid instruction stream, or you have
self modifying code that valgrind hasn't detected. Does --smc-check=all help at
all?

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