Valgrind unhandled instruction bytes error

Question

In order to search for memory leaks in my application based on the Liv555 library, I tried to run it using valgrind. It results in the following error:

vex amd64->IR: unhandled instruction bytes: 0xC5 0xF9 0x57 0xC0 0xC5 0xFA 0x10 0x15

Running it on another computer does not result in this error (it runs just fine), so I expect this to be the result of some library version. Could this be the problem? If so, does anyone know which library could be causing the error? The output of valgrind with the -v -v options is located here.

Answer 1

Here the FAQ with exact explanation.

Search for "vex x86->IR: unhandled instruction bytes"

Here the issue:

Looks like you've using binary (/usr/lib/libFLAC.so.8.2.0) compiled with intel SSE4 optimization (strncmp_sse42) which is not supported on amd you've using (Arch and hwcaps: AMD64, amd64-sse3-cx16).

Answer 2

I had a similar issue on CentOS 7:

vex amd64->IR: unhandled instruction bytes: 0xF 0xAE 0x64 0x24 0x40 0x48 0x8B 0x73
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=0
==10527== valgrind: Unrecognised instruction at address 0x4016b18.
==10527==    at 0x4016B18: _dl_runtime_resolve_xsave (in /usr/lib64/ld-2.17.so)

The solution was to install the kernel debug info.

yum --enablerepo=base-debuginfo install -y kernel-debuginfo-$(uname -r)