Process terminating with default action of signal 11 (SIGSEGV)
  Access not within mapped region at address 0x70000324543E
    at 0x10042E42A: _pthread_find_thread (in /usr/lib/system/libsystem_pthread.dylib)
    by 0x100430CE8: _pthread_lookup_thread (in /usr/lib/system/libsystem_pthread.dylib)
    by 0x100430AC0: pthread_join (in /usr/lib/system/libsystem_pthread.dylib)
    by 0x100000C75: child_fn_1 (threadname.c:51)
    by 0x10042FCC2: _pthread_body (in /usr/lib/system/libsystem_pthread.dylib)
    by 0x10042FC3F: _pthread_start (in /usr/lib/system/libsystem_pthread.dylib)
    by 0x10042CDA4: thread_start (in /usr/lib/system/libsystem_pthread.dylib)
  If you believe this happened as a result of a stack
  overflow in your program's main thread (unlikely but
  possible), you can try to increase the size of the
  main thread stack using the --main-stacksize= flag.
  The main thread stack size used in this run was 8388608.
:0:schedule VG_(sema_down): read returned -4

Memcheck: mc_leakcheck.c:1045 (void lc_scan_memory(Addr, SizeT, Bool, Int, Int, Addr, SizeT)): Assertion 'bad_scanned_addr >= VG_ROUNDUP(start, sizeof(Addr))' failed.

Reproducible: Always

Steps to Reproduce:
1. Apply preliminary patch set from bz#348909
2. $ ./autogen.sh
3. $ ./configure
4. $ make
5. $ make check
6. $ perl tests/vg_regtest memcheck/tests/err_disable3 memcheck/tests/threadname memcheck/tests/threadname_xml

Actual Results:  
$ perl tests/vg_regtest memcheck/tests/err_disable3 memcheck/tests/threadname memcheck/tests/threadname_xml
err_disable3:    valgrind   -q ./err_disable3 
sh: line 1: 15976 Segmentation fault: 11  VALGRIND_LIB=/Users/usera/Coding/valgrind/.in_place VALGRIND_LIB_INNER=/Users/usera/Coding/valgrind/.in_place /Users/usera/Coding/valgrind/./coregrind/valgrind --command-line-only=yes --memcheck:leak-check=no --tool=memcheck -q ./err_disable3 > err_disable3.stdout.out 2> err_disable3.stderr.out
*** err_disable3 failed (stderr) ***
threadname:      valgrind   -q ./threadname 
sh: line 1: 16020 Killed: 9               VALGRIND_LIB=/Users/usera/Coding/valgrind/.in_place VALGRIND_LIB_INNER=/Users/usera/Coding/valgrind/.in_place /Users/usera/Coding/valgrind/./coregrind/valgrind --command-line-only=yes --memcheck:leak-check=no --tool=memcheck -q ./threadname > threadname.stdout.out 2> threadname.stderr.out
*** threadname failed (stderr) ***
threadname_xml:  valgrind   --xml=yes --xml-fd=2 --log-file=/dev/null ./threadname 
*** threadname_xml failed (stderr) ***

== 3 tests, 3 stderr failures, 0 stdout failures, 0 stderrB failures, 0 stdoutB failures, 0 post failures ==
memcheck/tests/err_disable3              (stderr)
memcheck/tests/threadname                (stderr)
memcheck/tests/threadname_xml            (stderr)

Expected Results:  
No regression test failures.