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 <alexaazev...@gmail.com> Sent: Wednesday, February 5, 2020 10:50 AM To: valgrind-users@lists.sourceforge.net 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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