Re: [Valgrind-users] Valgrind-3.16.0.RC2 is available for testing

[Tom H. <to...@co...>]

On 26/05/2020 09:06, Patrick Bégou wrote:

> valgrind-3.16.0.RC2 doesn't work for me (as previous version on this 
> server).

Are you saying that it fails on a binary that worked before?

> vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0xFD 0x8 0x6F 0x5 
> 0x25 0xA8 0x18 0x0
> vex amd64->IR:   REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
> vex amd64->IR:   VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=NONE
> vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=0
> ==306850== valgrind: Unrecognised instruction at address 0x6ddf581.
> vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0xFD 0x8 0x6F 0x5 
> 0x25 0xA8 0x18 0x0
> vex amd64->IR:   REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
> vex amd64->IR:   VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=NONE
> vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=0

Because this is an instruction with an EVEX prefix that is not
supported by any version of valgrind ever so I don't see how this
binary can have worked with the previous version of valgrind.

I suspect that you have in fact recompiled the program with
a different compiler or different optimization settings since
the time when it worked?

Tom

-- 
Tom Hughes (to...@co...)
http://compton.nu/