https://bugs.kde.org/show_bug.cgi?id=508564
Bug ID: 508564
Summary: valgrind memcheck 3.25.1 unhandled instruction bytes
on AMD Ryzen 9 7950X3D
Classification: Developer tools
Product: valgrind
Version First 3.25.0
Reported In:
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
valgrind memcheck 3.25.1 errors on AMD Ryzen 9 7950X3D
STEPS TO REPRODUCE
1. get AMD Ryzen 9 7950X3D or equivalent Zen 4 CPU.
2. compile program with GCC version 14.3.0, option "-march=native", "-O2" or
"-O0". A simple C program like "int main(void) { return 0; }" is sufficient,
because the program start breaks in glibc.
3. compile glibc with GCC version 14.3.0, option "-march=native -ggdb -Og"
4. execute program with valgrind memcheck
OBSERVED RESULT
vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0x7F 0x48 0x7F 0x84 0x24
0x20 0x0 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
==12277== valgrind: Unrecognised instruction at address 0x4023a7d.
==12277== at 0x4023A7D: _dl_start (rtld.c:565)
==12277== by 0x40215C7: ??? (in /lib64/ld-linux-x86-64.so.2)
EXPECTED RESULT
memcheck the program
SOFTWARE/OS VERSIONS
Gentoo Linux.
Kernel 6.12.40 64bit
ADDITIONAL INFORMATION
workaround exists with gcc option "-march=znver3 -mtune=znver4".
option "-march=znver4" does not work
--
You are receiving this mail because:
You are watching all bug changes.
