> I'm running on two different machines:
>
> 1) MacBook Pro / Intel i7 / OS X 10.7.4 / Xcode 4.3.1 (which uses
> LLVM/CLANG)
> 2) iMac / Intel Core 2 Duo / OS X 10.6.8 / Xcode 3.2 (which uses GCC)
>
> I'm running valgrind-3.8.0.SVN that I built locally.
>
> I get different results on each machine.
Please read [Valgrind-users] from about a week ago; the thread:
Poster: Tanmay Mohapatra <tanma...@hotmail.com>
Subject: Strange warning for invalid read of size 8 in memcpy
Xcode 3.2 has some strange memcpy which triggers a complaint from memcheck.
So far, we have not been unable to get a disassembly. Can you post the code
that surrounds the actual instruction which draws the complaint?
Something like the output from
(gdb) x/50i 0x7FFFFFE00BAC - 0x40
if the pc *at* the complaint was 0x7FFFFFE00BAC ?
Xcode 3.2 also evades valgrind's REDIR machinery. Run with "valgrind -v"
and notice how REDIR works in XCode 4.3.y (I have 4.3.2 under Darwin 11.4.0)
but not in XCode 3.2.
When --trace-syscalls=yes, then the important pieces are:
1) the 20 intercepts which surround (10 before, 10 after):
UNKNOWN __pthread_sigmask is unsupported. This warning will not be
repeated.
2) the 20 intercepts just prior to:
vex amd64->IR: unhandled instruction bytes: 0xF 0xB 0x55 0x48 0x89 0xE5
0x41 0x56
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