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ZNC segfaults when compiled with Clang #823

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opened 2026-10-05 04:46:38 +02:00 by adam · 4 comments
adam commented 2026-10-05 04:46:38 +02:00
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I compiled a fresh (removed all previous build files) copy of ZNC with Clang, and when I go to run it, it segfaults.
If debugging is enabled at build time, everything runs fine

$ uname -a
Linux prestige 4.13.0-37-generic #42-Ubuntu SMP Wed Mar 7 14:13:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
$ clang --version
clang version 4.0.1-6 (tags/RELEASE_401/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
$ znc --version
ZNC 1.7.x-git-930-d6bfe504 - https://znc.in
IPv6: yes, SSL: yes, DNS: threads, charset: yes, i18n: no, build: autoconf
I compiled a fresh (removed all previous build files) copy of ZNC with Clang, and when I go to run it, it segfaults. If debugging is enabled at build time, everything runs fine ``` $ uname -a Linux prestige 4.13.0-37-generic #42-Ubuntu SMP Wed Mar 7 14:13:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux $ clang --version clang version 4.0.1-6 (tags/RELEASE_401/final) Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/bin $ znc --version ZNC 1.7.x-git-930-d6bfe504 - https://znc.in IPv6: yes, SSL: yes, DNS: threads, charset: yes, i18n: no, build: autoconf ``` <!-- github-sync-id:311279206 -->
adam closed this issue 2026-10-05 04:46:38 +02:00
adam commented 2026-10-05 04:46:39 +02:00
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Well.... backtrace from gdb? Some information collected via valgrind? An error message? Anything more than "it crashes"?

Well.... backtrace from `gdb`? Some information collected via `valgrind`? An error message? Anything more than "it crashes"? <!-- github-comment-id:378643336 -->
adam commented 2026-10-05 04:46:40 +02:00
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There wasn't any error message at runtime appart from Segmentation Fault: core dumped
I'm currently in the process of doing gdb debugging.

There wasn't any error message at runtime appart from `Segmentation Fault: core dumped` I'm currently in the process of doing `gdb` debugging. <!-- github-comment-id:378645884 -->
adam commented 2026-10-05 04:46:40 +02:00
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I'm not sure why/how this happened but it stopped happening

I'm not sure why/how this happened but it stopped happening <!-- github-comment-id:378649425 -->
adam commented 2026-10-05 04:46:41 +02:00
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Reopen when you have the details.
Also note that ZNC has continuous testing set up for both GCC and Clang.

Reopen when you have the details. Also note that ZNC has continuous testing set up for both GCC and Clang. <!-- github-comment-id:378676870 -->
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Reference: adam/znc#823