If you call clone directly you are responsible for setting up the TLS area yourself.

$ abrt-cli ls  | grep different_creds | wc -l
39
$ gdb -c /var/spool/abrt/ccpp-2015-07-24-10\:21\:14-8014/coredump  different_creds
 Core was generated by `./different_creds --pidfile=different_creds.pid --outfile=different_creds.out'.
 Program terminated with signal SIGILL, Illegal instruction.
 #0  0x00007f86e2d8c7d9 in _dl_x86_64_restore_sse () from /lib64/ld-linux-x86-64.so.2
 Missing separate debuginfos, use: dnf debuginfo-install glibc-2.21-7.fc22.x86_64 libattr-2.4.47-9.fc22.x86_64 libcap-2.24-7.fc22.x86_64
 (gdb) bt
 #0  0x00007f86e2d8c7d9 in _dl_x86_64_restore_sse () from /lib64/ld-linux-x86-64.so.2
 #1  0x00007f86e2d84add in _dl_fixup () from /lib64/ld-linux-x86-64.so.2
 #2  0x00007f86e2d8bbc0 in _dl_runtime_resolve () from /lib64/ld-linux-x86-64.so.2
 #3  0x0000000000402da3 in sys_futex (val3=0, uaddr2=0x0, timeout=0x0, val=0, op=0, uaddr=0x6063f0 <sig_received>) at lock.h:29
 #4  futex_wait_while (f=0x6063f0 <sig_received>, v=0) at lock.h:121
 #5  test_waitsig () at test.c:367
 #6  0x0000000000401c4b in main (argc=<optimized out>, argv=0x7ffce16432f8) at different_creds.c:82

Reported-by: Mr Jenkins
Cc: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Acked-by: Tycho Andersen <tycho.andersen@canonical.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>