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There is possible deadlock in dynamic ASan runtime when we dlopen() shared lib which creates a thread at the global initialization stage. The scenario: 1) dlopen grabs a GI_pthread_mutex_lock in main thread. 2) main thread calls pthread_create, ASan intercepts it, calls real pthread_create and waits for the second thread to be "fully initialized". 3) Newly created thread tries to access a thread local disable_counter in LSan (to complete its "full initialization") and hangs in tls_get_addr_tail, because it also tries to acquire GI_pthread_mutex_lock. The issue is reproducible on relative recent Glibc versions e.g. 2.23. Differential Revision: https://reviews.llvm.org/D26028 llvm-svn: 285385
Compiler-RT ================================ This directory and its subdirectories contain source code for the compiler support routines. Compiler-RT is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. ================================