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One build 270 crash log aborts in talloc (talloc_abort_unknown_value) inside libsmbclient name resolution while a media-source download opens a file through SMBBridge, with FFmpeg reading an smb:// file on another thread at the same time. libsmbclient keeps its talloc stackframe behind a table of thread functions, and none was installed (this build does not export smbc_thread_posix()), so every thread shared one stackframe and the two users freed each other's allocations. Install a pthread implementation of smb_thread_functions at load time, before any libsmbclient use, including FFmpeg's. The struct layout matches what talloc_stack and smb_threads in the bundled library read (get_tls at +0x30, lock_mutex at +0x10).