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From: "carlos at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/27581] Threaded program crashes under ulimit -s unlimited
Date: Mon, 15 Mar 2021 21:45:15 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27581

Carlos O'Donell <carlos at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |carlos at redhat dot com

--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Florian Weimer from comment #1)
> Once you have multiple threads, there is really no such thing as an
> unlimited stack anymore for conceptual reasons, so glibc just picks a 2 M=
iB
> default and applies it to all the created stacks.

Right the relevant code is in nptl/nptl-init.c
(__pthread_initialize_minimal_internal).

Users still see these values of conceptually muddled, and it's hard to expl=
ain
the distinction between executable stack and the relation to thread stack
because there appears to be one but there isn't, there are just defaults be=
ing
adjusted to be heuristic matches.

In the case you need more control we provide pthread_setattr_default_np() t=
hat
allows you to set a larger default stack size for all threads by default. T=
his
way you can independently control the stack size of all threads and the sta=
ck
size of the main program.

--=20
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