This test relies on sanitizer common interceptor to pick the oldest version of
sem_init function from Glibc. But LSan actually doesn't intercept sem_init, thus
the new implementation is called that causes test failure. Disable it for LSan x86,
the proper fix would require to check Glibc version at runtime and adjust
GET_SEM_VALUE(V) accordingly.
llvm-svn: 294001
Reapply 282061.
One of the tests relying on sem_t's layout gets the wrong value for versions of
glibc newer than 2.21 on platforms that don't have 64-bit atomics (e.g. ARM).
This commit fixes the test to work with:
* versions of glibc >= 2.21 on platforms with 64-bit atomics: unchanged
* versions of glibc >= 2.21 on platforms without 64-bit atomics: the semaphore
value is shifted by SEM_VALUE_SHIFT (which is set to 1 in glibc's internal
headers)
* versions of glibc < 2.21: unchanged
The logic is complicated a bit by the fact that the sanitizers always pick the
oldest version of the symbol available in glibc, which creates discrepancies
between old platforms which contain several versions od the sem_init symbol, and
newer platforms which contain only one.
See the glibc 2.23 sources:
* sysdeps/nptl/internaltypes.h (struct new_sem for glibc >= 2.21 and
struct old_sem for glibc < 2.21)
* nptl/sem_getvalue.c
This was uncovered on one of the new buildbots that we are trying to move to
production.
Differential Revision: https://reviews.llvm.org/D24766
llvm-svn: 283299
One of the tests relying on sem_t's layout gets the wrong value for versions of
glibc newer than 2.21 on platforms that don't have 64-bit atomics (e.g. ARM).
This commit fixes the test to work with:
* versions of glibc >= 2.21 on platforms with 64-bit atomics: unchanged
* versions of glibc >= 2.21 on platforms without 64-bit atomics: the semaphore
value is shifted by SEM_VALUE_SHIFT (which is set to 1 in glibc's internal
headers)
* versions of glibc < 2.21: unchanged
See the glibc 2.23 sources:
* sysdeps/nptl/internaltypes.h (struct new_sem for glibc >= 2.21 and
struct old_sem for glibc < 2.21)
* nptl/sem_getvalue.c
This was uncovered on one of the new buildbots that we are trying to move to
production.
Differential Revision: https://reviews.llvm.org/D24766
llvm-svn: 282061
glibc can use one of 2 layouts for semaphores: architectures that
don't HAVE_64B_ATOMIC use an uint32_t field with semaphore value,
then a private field, then a waiting thread count field - this is
the layout currently assumed by the test. However, HAVE_64B_ATOMIC
arches use a fused uint64_t field that contains the value in low bits
and waiting thread count in high bits, followed by a private field.
This resulted in taking private field from the wrong offset on 64-bit
atomic platforms (the test still passed, but didn't actually test
the private field). On big-endian platforms, this resulted in a fail,
since the first 4 bytes overlay the thread count field, and not
the value field.
Found while porting ASan to s390x.
Patch by Marcin Kościelnicki.
llvm-svn: 265715
Old version of sem_init (GLIBC_2.0) fails to initialize parts of
sem_t that are used in sem_timedwait. This is fixed in GLIBC_2.1,
but since ASan interceptors downgrade sem_* to the oldest available
version, this can introduce bugs that are only present in sanitized
build. Workaround by zero-initializing sem_t in sem_init.
llvm-svn: 250113
Bill Seurer