[Valgrind-users] errno + pthread failure with Valgrind 1.9.6

[Valient G. <vg...@po...>]

I was trying to track down a problem using Valgrind 1.9.6 on a program,
but the program behaved much differently when running under valgrind.

The problem is that a call to lstat() on a non-existant file should
retur -1 and sets errno. This is exactly how it behaves normally, but
when running under valgrind it returns -1 but errno is 0!

Attached is a small test program which calls lstat on a bogus filename. 
Results:

native, no pthreads:  as expected (ret -1, errno = 2)
valgrind, no pthreads: as expected ""
native, pthreads: as expected ""
valgrind, pthreads:  lstat returns -1 but errno = 0!

no pthread build:  g++ -o test-lstat test-lstat.cpp
pthread build:  g++ -o test-lstat test-lstat.cpp -lpthread

SuSE 8.2 system, gcc 3.3 (20030226 prerelease)
glibc 2.3.2

Is this a known problem related to operation with pthreads?

regards,
Valient