https://bugs.kde.org/show_bug.cgi?id=403123
Bug ID: 403123
Summary: vex amd64->IR: unhandled instruction bytes: 0xF3 0x48
0xF 0xAE 0xD3 0x48 0x83 0xC4 0x8 0x5B
Product: valgrind
Version: 3.15 SVN
Platform: Compiled Sources
OS: FreeBSD
Status: REPORTED
Severity: normal
Priority: NOR
Component: vex
Assignee: jsew...@acm.org
Reporter: bogorods...@gmail.com
Target Milestone: ---
I'm running a freebsd fork based 3.15, however, it looks like this isuue is not
related to the freebsd specifics.
Running any application (using uname in this example as a very simple one)
results in:
==2934== Memcheck, a memory error detector
==2934== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==2934== Using Valgrind-3.15.0.GIT and LibVEX; rerun with -h for copyright info
==2934== Command: uname
==2934==
vex amd64->IR: unhandled instruction bytes: 0xF3 0x48 0xF 0xAE 0xD3 0x48 0x83
0xC4 0x8 0x5B
vex amd64->IR: REX=1 REX.W=1 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
==2934== valgrind: Unrecognised instruction at address 0x400899c.
==2934== at 0x400899C: ??? (in /libexec/ld-elf.so.1)
==2934== by 0x4009D0F: ??? (in /libexec/ld-elf.so.1)
==2934== by 0x4008018: ??? (in /libexec/ld-elf.so.1)
==2934== Your program just tried to execute an instruction that Valgrind
==2934== did not recognise. There are two possible reasons for this.
==2934== 1. Your program has a bug and erroneously jumped to a non-code
==2934== location. If you are running Memcheck and you just saw a
==2934== warning about a bad jump, it's probably your program's fault.
==2934== 2. The instruction is legitimate but Valgrind doesn't handle it,
==2934== i.e. it's Valgrind's fault. If you think this is the case or
==2934== you are not sure, please let us know and we'll try to fix it.
==2934== Either way, Valgrind will now raise a SIGILL signal which will
==2934== probably kill your program.
==2934==
==2934== Process terminating with default action of signal 4 (SIGILL): dumping
core
==2934== Illegal opcode at address 0x400899C
==2934== at 0x400899C: ??? (in /libexec/ld-elf.so.1)
==2934== by 0x4009D0F: ??? (in /libexec/ld-elf.so.1)
==2934== by 0x4008018: ??? (in /libexec/ld-elf.so.1)
==2934==
==2934== HEAP SUMMARY:
==2934== in use at exit: 0 bytes in 0 blocks
==2934== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==2934==
==2934== All heap blocks were freed -- no leaks are possible
==2934==
==2934== For lists of detected and suppressed errors, rerun with: -s
==2934== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 1 from 1)
Illegal instruction
$ objdump -S /libexec/ld-elf.so.1|grep -i 899c:
899c: f3 48 0f ae d3 wrfsbase %rbx
$
System compiler version is:
FreeBSD clang version 7.0.1 (tags/RELEASE_701/final 349250) (based on LLVM
7.0.1)
Linker:
LLD 7.0.1 (FreeBSD 349250-1300001) (compatible with GNU linkers)
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