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Editorial Team
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Asked: 2026-05-19T22:15:41+00:00

On an embedded file system, I would like to get rid of libthread_db. My

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On an embedded file system, I would like to get rid of libthread_db. My understanding
was that it was only necessary when debugging a program using pthread. However, here is my observation :

  • If the libthread_db is not present at boot time (when the first pthread using programm is launched), launching such a program causes a segfault.

  • Adding libthread_db later (ie after a pthread program has segfaulted) doesn’t change anything. Every program that uses pthread will segfault on launch.

So it seems libthread_db is essential to run any sort of program using pthread.

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1 Answer

  1. Editorial Team

    libthread_db is never used by a threaded program. It is only used by the debugger.

    Your assertion that libthread_db is somehow required to run a program using pthreads is incorrect. If your pthread programs crash when libthread_db is removed from the system, something else is broken on your embedded target; removal of libthread_db merely triggers that something else.

    You can trivially confirm this: build a pthread program on a regular Linux system. Run that program under strace, and observe that libthread_db does not appear in strace output. Now rename /lib/libthread_db.so.1 to something else, and observe that the test program continues to work just fine.

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