https://bugs.kde.org/show_bug.cgi?id=406669

Mark Wielaard <m...@klomp.org> changed:

           What    |Removed                     |Added
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                 CC|                            |m...@klomp.org

--- Comment #1 from Mark Wielaard <m...@klomp.org> ---
(In reply to peoro from comment #0)
> I'm playing around with QtWebKit and WebGL. The program runs smoothly
> without valgrind, while valgrind makes it fail:
> 
> vex amd64->IR: unhandled instruction bytes: 0xC5 0xD4 0xC2 0xED 0xF 0xC5
> 0xFC 0x29 0xAC 0x24
> vex amd64->IR:   REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
> vex amd64->IR:   VEX=1 VEX.L=1 VEX.nVVVV=0x5 ESC=0F
> vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=0
> ==7397== valgrind: Unrecognised instruction at address 0x540b16fe.

c5d4c2ed0f vcmptrueps ymm5,ymm5,ymm5

So I suspect this is a duplicate of https://bugs.kde.org/show_bug.cgi?id=399287
Which was fixed for the just release valgrind 3.15.0.

Could you re-try with that version?

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