Roman Vinogradov
19bd80e29a
libnss_systemd currently uses a thread_local recursion guard to avoid re-entering nss-systemd during NSS lookups. Since libnss_systemd.so.2 is loaded lazily by glibc, accessing ELF TLS may trigger dynamic TLS allocation in __tls_get_addr(). Under allocation failure conditions, glibc terminates the process from the dynamic loader instead of allowing the NSS module to return a normal failure. Replace the recursion guard with POSIX thread-specific data to preserve the same per-thread semantics while avoiding ELF TLS in the NSS module. Note that pthread_setspecific() may still allocate internally on first use per thread. The key improvement is that any such failure is returned as a normal error code rather than terminating the process from inside the dynamic loader. Related: #42559
System and Service Manager
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