[PATCH] pthread_detach: add a comment about a known segfault bug.

[Aaron Jacobs]

On Tue, Nov 25, 2025 at 1:06 AM Adhemerval Zanella Netto
<adhemerval.zanella@linaro.org> wrote:
> And I do not think adding a comment to bug report improves much here. We
> already have a bug report with a lot of background, and a proposed solution.

Right, but the bug report is not discoverable from the source code, which
somebody like me may spend hours looking at before luckily finding the bug
report from some random Reddit thread when they finally get the right search
term. This is not a good experience.

This also happened to the other very experienced engineer with lots of
debugging experience in glibc and elsewhere who was assisting me.

What is the harm of making it more discoverable? This can easily be reverted
with the fix for the bug.


On Tue, Nov 25, 2025 at 2:21 AM Sam James <sam@gentoo.org> wrote:
> If you can test azanella's patches in an environment where you can
> reliably reproduce the bug, that would be very helpful indeed.

Will do if/when I figure out how to wrangle our build system to let me use
local edits to glibc. But I've also attached a test that reproduces the
problem once every few thousand runs, at least when run on Google's
distributed test running system.

(It uses Google-isms, but all open source stuff, and all should be easily
translatable if you want to avoid the dependencies.)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pthread_detach_test.cc
Type: application/octet-stream
Size: 1878 bytes
Desc: not available
URL: <https://sourceware.org/pipermail/libc-alpha/attachments/20251125/8d109c28/attachment.obj>