Bug 468544

Summary: vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0x7F 0x28 0x7F 0x84 0x24 0xA8 0xFF 0xFF (vmovdqu8)
Product: [Developer tools] valgrind Reporter: Kek <ktstngubljie>
Component: vexAssignee: Julian Seward <jseward>
Status: RESOLVED DUPLICATE    
Severity: major CC: gabravier, mark
Priority: NOR    
Version: 3.20.0   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description Kek 2023-04-15 18:25:35 UTC 
Full error report:

vex amd64->IR: unhandled instruction bytes: 0x62 0xF1 0x7F 0x28 0x7F 0x84 0x24 0xA8 0xFF 0xFF
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
==577== valgrind: Unrecognised instruction at address 0x40195bd.
==577==    at 0x40195BD: _dl_sysdep_parse_arguments (dl-sysdep.c:90)
==577==    by 0x401A146: _dl_sysdep_start (dl-sysdep.c:106)
==577==    by 0x401BB3C: _dl_start_final (rtld.c:497)
==577==    by 0x401BB3C: _dl_start (rtld.c:584)
==577==    by 0x401A9D7: ??? (in /lib64/ld-linux-x86-64.so.2)

This is pretty major, as this instruction is encountered in dynamic linker ld-linux-x86-64.so.2, which renders Valgrind basically unusable on my machine (and, I suspect, on any other modern source-based distro).
Comment 1 Mark Wielaard 2023-04-20 11:42:21 UTC 
This is VMOVDQU8 an AVX512 instruction

*** This bug has been marked as a duplicate of bug 383010 ***