[Compiler-rt] Mark getpwnam_r_invalid_user as expected failure for MIPS

[mohit.bhakkad]

Summary

On MIPS, there might be leak of some memory in libc when we call getpwnam_r, so it fails with a lsan error, otherwise assertions used in this test are positive.

[samsonov]

Please investigate this issue in more details. "There might be some leak in getpwnam_r" is not a good enough reason to exclude this test on MIPS (note that it also runs for ASan, TSan, MSan, not just for LSan).

[vitalybuka]

Please followup on samsonov@ comment.

[mohit.bhakkad]

@samsonov sure I will investigate libc code and get back to you.
Till now,
I have tried replacing original libc call with a dummy stub of getpwnam_r returning same values, which makes the test pass.
Also with msan, tsan test passes without fail.

[mohit.bhakkad]

Looks like there was issue with some library on the machine I was working on previously, as I am unable to replicate error on any other mips(el/eb) machine.
Abandoning this change.
Thanks!

test/sanitizer_common/TestCases/Linux/getpwnam_r_invalid_user.cc

 // Regression test for a crash in getpwnam_r and similar interceptors.
+
+// On MIPS, this test is failing with lsan error in libc
+// XFAIL: mips
 // RUN: %clangxx -O0 -g %s -o %t && %run %t
 
 #include <assert.h>
 #include <errno.h>
 #include <pwd.h>
 #include <signal.h>
 #include <stdio.h>
 #include <sys/types.h>