opcache: symbol not found in flat namespace (_zend_gdb_register_code) when JIT enabled on Mac OS X #9639

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1. dunglas

   added

   Bug

   Status: Needs Triage

   on Sep 29, 2022
2. devnexen commented on Sep 29, 2022

   

   devnexen

   on Sep 29, 2022

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   I could not reproduce on native arm64 nor in rosetta mode with both gcc and clang, would it be possible to give a bit more context ? did you try for example instead of removing opcache jit, removing zts ?
3. iluuu1994 commented on Sep 29, 2022

   

   iluuu1994

   on Sep 29, 2022

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   This is odd, zend_gdb_register_code is not static and zend_gdb.c is compiled unconditionally.

   👍React with 👍2Reacted by David CARLIER and R. Christian McDonald
4. devnexen commented on Sep 29, 2022

   

   devnexen

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   start to wonder if this is a somewhat similar issue found here (as embed sapi involved).

   👍React with 👍1Reacted by Ilija Tovilo
5. dunglas commented on Sep 29, 2022

   

   dunglas

   on Sep 29, 2022

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   did you try for example instead of removing opcache jit, removing zts ?

   Good catch, removing --enable-zts fixes the issue too!

   I've written a SAPI to embed PHP in a Go binary. I can provide you a (private) repo with a reproducer if needed!
6. devnexen commented on Sep 30, 2022

   

   devnexen

   on Sep 30, 2022

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   sure why not feel free to send an email if you prefer.
7. cmb69

   added

   SAPI: embed

   on Sep 30, 2022
8. dunglas commented on Sep 30, 2022

   

   dunglas

   on Sep 30, 2022

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   I upgraded to the latest commit of the PHP-8.2 branch, recompiled with the exact same flags... and the issue is gone.

   Thanks for your help everybody!

   🚀React with 🚀1Reacted by David CARLIER
9. dunglas

   closed this as completedon Sep 30, 2022
10. dunglas commented on Oct 3, 2022

    

    dunglas

    on Oct 3, 2022

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    This issue is back again (macOS only). I probably made a mistake while recompiling hiding the issue. I can still give access to a reproducer.
11. devnexen commented on Oct 3, 2022

    

    devnexen

    on Oct 3, 2022

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    did you acknowledge what was advised here ?
12. dunglas commented on Oct 4, 2022

    

    dunglas

    on Oct 4, 2022

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    @devnexen this looks related but I'm not sure if that's precisely the same issue. Unlike #9635, I'm not loading PHP as a plugin for another app. PHP is statically compiled in the main Go binary:

    +-------+-------+
    |Go App         |
    +---------------+
    |     PHP       |
    +--+---------+--+
       |         |dlopen/dlsym
    +--+---+ +---+--+
    | PHP  | | PHP  |
    | ext1 | | ext2 |
    +------+ +------+
    

    Basically, the main app loads directly opcache.so.
13. dunglas

    reopened this on Oct 5, 2022
14. devnexen commented on Oct 5, 2022

    

    devnexen

    on Oct 5, 2022

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    This issue is back again (macOS only). I probably made a mistake while recompiling hiding the issue. I can still give access to a reproducer.

    you can send an email however won t be able to have a proper look at it before this weekend at earliest, pretty busy atm. but if someone else wants a crack at it before me that s fine :-)
15. dunglas commented on Oct 17, 2022

    

    dunglas

    on Oct 17, 2022

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    Now that FrankenPHP is public, here is a quick reproducer (on Mac):

    compile PHP

    ./buildconf
    ./configure \
        --enable-embed=static \
        --enable-zts \
        --enable-static \
        --enable-shared=no \
        --with-iconv=/opt/homebrew/opt/libiconv/ \
        --enable-debug
    make -j$(nproc)
    sudo make install
    

    Be sure that opcache is loaded in php.ini

    run Franken's test suite

    # Go must be installed
    git clone --recursive git@github.com:dunglas/frankenphp.git
    cd frankenphp
    go test -v
    

    Result:

    <b>Warning</b>:  Failed loading Zend extension 'opcache' (tried: /usr/local/lib/php/extensions/debug-zts-20220830/opcache (dlopen(/usr/local/lib/php/extensions/debug-zts-20220830/opcache, 0x0009): tried: '/usr/local/lib/php/extensions/debug-zts-20220830/opcache' (no such file)), /usr/local/lib/php/extensions/debug-zts-20220830/opcache.so (dlopen(/usr/local/lib/php/extensions/debug-zts-20220830/opcache.so, 0x0009): symbol not found in flat namespace (_zend_gdb_register_code))) in <b>Unknown</b> on line <b>0</b><br />
    

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16. kamil-tekiela commented on Nov 5, 2026

    

    kamil-tekiela

    on Nov 5, 2026

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    I believe this has been "fixed" in PHP 8.4 due to the new JIT IR implementation. Since older PHP versions are unsupported I am closing this. If that is not the case and the issue is still reproducible with the new JIT then please reopen the issue or create a new one with steps to reproduce it against PHP 8.4 or master. Also, opcache is no longer optional so no loading is needed.

    👍React with 👍1Reacted by Kévin Dunglas
17. kamil-tekiela

    closed this as completedon Nov 5, 2026