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[[!tag faq/open_issues]]

[[!meta title="Assertion `__pthread_threads' failed"]]

Some applications don't themselves link against libpthread, but then load
plugins which do link against libpthread.  This means internally switching from
single-threading to multi-threading, which is [[not yet
supported|open_issues/libpthread_dlopen]] by our [[/libpthread]], and results
in errors such as:

    ./pthread/../sysdeps/generic/pt-mutex-timedlock.c:70: __pthread_mutex_timedlock_internal: Assertion `__pthread_threads' failed.

This can be worked around by explicitly pre-loading libpthread, for example:

    $ LD_PRELOAD=/lib/i386-gnu/libpthread.so.0.3 [application]