Bug 866793 - Regression vex amd64->IR: unhandled instruction bytes: 0xF0 0xF 0xC0 0x10 0x84 0xD2 0xF 0x95 (lock xaddb)
Summary: Regression vex amd64->IR: unhandled instruction bytes: 0xF0 0xF 0xC0 0x10 0x8...
Alias: None
Product: Fedora
Classification: Fedora
Component: valgrind
Version: 17
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Mark Wielaard
QA Contact: Fedora Extras Quality Assurance
Depends On:
Blocks: 866941 866943
TreeView+ depends on / blocked
Reported: 2012-10-16 07:23 UTC by Mark Wielaard
Modified: 2012-12-20 15:27 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 866941 (view as bug list)
Last Closed: 2012-12-20 15:27:17 UTC

Attachments (Terms of Use)
valgrind-xaddb.patch (1.06 KB, patch)
2012-10-16 09:09 UTC, Jakub Jelinek
no flags Details | Diff

System ID Priority Status Summary Last Updated
KDE Software Compilation 307106 None None None 2012-10-16 09:39:15 UTC

Description Mark Wielaard 2012-10-16 07:23:10 UTC
Originally https://bugzilla.redhat.com/show_bug.cgi?id=755242#c7

valgrind-3.8.1-3.fc17 fails.

[mrsam@octopus base]$ valgrind --tool=memcheck ./testhttpclientauth 
==28524== Memcheck, a memory error detector
==28524== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==28524== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==28524== Command: ./testhttpclientauth
vex amd64->IR: unhandled instruction bytes: 0xF0 0xF 0xC0 0x10 0x84 0xD2 0xF 0x95
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
==28524== valgrind: Unrecognised instruction at address 0x56c947.

Comment 1 Jakub Jelinek 2012-10-16 07:35:51 UTC
Weird, that is lock xaddb %dl,(%rax), that ought to be handled...

Comment 2 Mark Wielaard 2012-10-16 07:51:37 UTC
confirmed, valgrind 3.7.0 works fine, but with 3.8.x and also with upstream valgrind SVN:

$ /usr/local/install/valgrind/bin/valgrind -q --vgdb-error=0 ./test
==4405== (action at startup) vgdb me ... 
==4405== TO DEBUG THIS PROCESS USING GDB: start GDB like this
==4405==   /path/to/gdb ./test
==4405== and then give GDB the following command
==4405==   target remote | /usr/local/install/valgrind/lib/valgrind/../../bin/vgdb --pid=4405
==4405== --pid is optional if only one valgrind process is running

(gdb) target remote | /usr/local/install/valgrind/lib/valgrind/../../bin/vgdb --pid=4405
Remote debugging using | /usr/local/install/valgrind/lib/valgrind/../../bin/vgdb --pid=4405
relaying data between gdb and process 4405
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.15.so.debug...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
[Switching to Thread 4405]
0x0000000004001530 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) c

Program received signal SIGILL, Illegal instruction.
0x00000000004004a7 in main ()
(gdb) disassemble 
Dump of assembler code for function main:
   0x000000000040049c <+0>:	push   %rbp
   0x000000000040049d <+1>:	mov    %rsp,%rbp
   0x00000000004004a0 <+4>:	mov    %edi,-0x4(%rbp)
   0x00000000004004a3 <+7>:	mov    %rsi,-0x10(%rbp)
=> 0x00000000004004a7 <+11>:	lock xadd %dl,(%rax)
   0x00000000004004ab <+15>:	mov    $0x0,%eax
   0x00000000004004b0 <+20>:	pop    %rbp
   0x00000000004004b1 <+21>:	retq   
End of assembler dump.

Comment 3 Jakub Jelinek 2012-10-16 09:09:34 UTC
Created attachment 628051 [details]

I'm probably missing something obvious, but to me it looks like xaddb handling in valgrind 3.7.x and earlier was misplaced and with AVX merge it got commented out.

Comment 4 Mark Wielaard 2012-10-16 09:39:15 UTC
Confirmed with upstream. "it got disabled during the massive reorganisation of that insn decoder last year, and never got re-enabled"


Comment 5 Fedora Update System 2012-10-16 14:02:38 UTC
valgrind-3.8.1-4.fc17 has been submitted as an update for Fedora 17.

Comment 6 Fedora Update System 2012-10-16 14:03:39 UTC
valgrind-3.8.1-4.fc18 has been submitted as an update for Fedora 18.

Comment 7 Fedora Update System 2012-10-17 00:29:01 UTC
Package valgrind-3.8.1-4.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing valgrind-3.8.1-4.fc17'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).

Comment 8 Fedora Update System 2012-12-20 15:27:21 UTC
valgrind-3.8.1-4.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

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