Re: valgrind: Unrecognised instruction

I have never used cachegrind, but I’ve seen a similar message before when using memcheck.
In my case, the problem was that I was using the wrong version of memcheck for my CPU type.
For example, I think I was trying to run a 32-bit version of memcheck with a 64-bit executable.

Ben

From: Alexandre Azevedo <[email protected]>
Sent: Wednesday, February 5, 2020 10:50 AM
To: [email protected]
Subject: [Valgrind-users] valgrind: Unrecognised instruction

Hello guys,

I'm currently trying to profile my program's cache behaviour using cachegrind. I can confirm the program seems to be working as I first tested cachegrind compiling my code with GCC. The problem is that I'm now using Intel C compiler and for some reason I keep getting the same error as I try to run it with cachegrind. Following is the error message.


vex amd64->IR: unhandled instruction bytes: 0xF3 0xF 0x1E 0xFA 0x41 0x56 0x41 0x89
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=0F
vex amd64->IR:   PFX.66=0 PFX.F2=0 PFX.F3=1
==23029== valgrind: Unrecognised instruction at address 0x4032e0.
==23029==    at 0x4032E0: __intel_new_feature_proc_init (in /home/arthur/Documentos/Prog.Paralela/intelseqkron)
==23029==    by 0x565282F: (below main) (libc-start.c:291)
==23029== Your program just tried to execute an instruction that Valgrind
==23029== did not recognise.  There are two possible reasons for this.
==23029== 1. Your program has a bug and erroneously jumped to a non-code
==23029==    location.  If you are running Memcheck and you just saw a
==23029==    warning about a bad jump, it's probably your program's fault.
==23029== 2. The instruction is legitimate but Valgrind doesn't handle it,
==23029==    i.e. it's Valgrind's fault.  If you think this is the case or
==23029==    you are not sure, please let us know and we'll try to fix it.
==23029== Either way, Valgrind will now raise a SIGILL signal which will
==23029== probably kill your program.
==23029==
==23029== Process terminating with default action of signal 4 (SIGILL)
==23029==  Illegal opcode at address 0x4032E0
==23029==    at 0x4032E0: __intel_new_feature_proc_init (in /home/arthur/Documentos/Prog.Paralela/intelseqkron)
==23029==    by 0x565282F: (below main) (libc-start.c:291)
==23029==


My best regards,

Alexandre

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