[Bug nptl/444] New: nptl/tst-mutex8 crashes

["tsv at solvo dot ru" <sourceware-bugzilla at sources dot redhat dot com>]

Linux kernel 2.6.8.1 on DEC Alpha
binutils 2.15.92.0.2 20040927
gcc version 3.4.2 20040907 (Red Hat 3.4.2-2)

../configure --prefix=/usr --enable-add-ons=nptl,libidn --without-cvs
--enable-kernel=2.4.0 --with-headers=/usr/include --enable-bind-now --with-tls
--with-__thread --build alpha-redhat-linux --host alpha-redhat-linux
--disable-profile

Everything compiles correctly. Then I tried to "make check" the first failed
test in nptl was "tst-mutex8".
After trying debugging it (I ran it with "--direct" option to avoid forking).

The GDB cautgh "Segmentation fault" in allocatestack.c around line 205:
  /* Clear the DTV.  */
  dtv_t *dtv = GET_DTV (TLS_TPADJ (result));
  memset (dtv, '\0', (dtv[-1].counter + 1) * sizeof (dtv_t));

GDB showed that "dtv" pointer was set to zero. I changed the code like this:
  if (dtv)
      memset (dtv, '\0', (dtv[-1].counter + 1) * sizeof (dtv_t));

the test started to work (and all other tests that use "pthread_create"
function). Btw, I think that "dtv" could have some value only if the allocated
stack is reused (that is not in my case).

I need to say that tests works only if I use ld-linux.so.2 from linuxthreads
glibc build. The test still fails if started with ld-linux.so.2 from nptl build.

I used LD_LIBRARY_PATH to point to correct nptl libraries.

Thank you,

-- 
           Summary: nptl/tst-mutex8 crashes
           Product: glibc
           Version: 2.3.3
            Status: NEW
          Severity: critical
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: tsv at solvo dot ru
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: alpha-redhat-linux-gnu
  GCC host triplet: alpha-redhat-linux-gnu
GCC target triplet: alpha-redhat-linux-gnu


http://sources.redhat.com/bugzilla/show_bug.cgi?id=444

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