Sorry, I misunderstood what you meant by "as previous version" there.
I thought you meant the previous version worked but you actually
meant that it failed.
As Julian says there is no easy fix - you have a library installed
that has been compiled to assume certain instructions are available
that are not in fact available under valgrind at the moment.
Tom
On 26/05/2020 09:26, Patrick Bégou wrote:
Hi Tom,
I'm a new user of Valgrind. I was needing it to check a large mpi code.
So I downloaded 3.15 version but even if hardware and software are 2 to
3 years old, valgrind does'nt work for me.
Nor gcc7, nor OpenMPI, nor my application (even the small test) used
specific option when they were built.
If this unsupported instruction (I do not know what is an EVEX prefix,
sorry) is the problem, how can I avoid it to use valgrind ?
I was just thinking that 3.16 could solve my problem....
Patrick
Le 26/05/2020 à 10:12, Tom Hughes a écrit :
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
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Tom Hughes (t...@compton.nu)
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