New: man 5 core incorrectly states circumstances in which a core is not produced
https://bugzilla.kernel.org/show_bug.cgi?id=216648
Bug ID: 216648
Summary: man 5 core incorrectly states circumstances in which a
core is not produced
Product: Documentation
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P1
Component: man-pages
Assignee: [email protected]
Reporter: [email protected]
Regression: No
As per title, the core manpage states:
There are various circumstances in which a core dump file is not produced:
[...]
* The RLIMIT_CORE (core file size) or RLIMIT_FSIZE (file size) resource limits for the process are set to zero; see getrlimit(2) and the documentation of the shell's ulimit command (limit in csh(1)).
However, this is not actually correct when core dumps are piped to a program, as the section below states ...
* The RLIMIT_CORE limit is not enforced for core dumps that are piped to a program via this mechanism.
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[Bug 216648] man 5 core incorrectly states circumstances in which a core is not produced
https://bugzilla.kernel.org/show_bug.cgi?id=216648
Alejandro Colomar (man-pages) ([email protected]) changed:
What |Removed |Added
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CC| |[email protected]
--- Comment #1 from Alejandro Colomar (man-pages) ([email protected]) --- Hi Luca,
Do you have any experiments demonstrating the actual behavior? Could you show them? And do you suggest any specific patch for that page?
You may consider reading
<https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING>
if you would like to send a patch for the page.
Thanks!
Alex
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[Bug 216648] man 5 core incorrectly states circumstances in which a core is not produced
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=216648
--- Comment #2 from Luca Versari ([email protected]) ---
Quoted 2 lines
Do you have any experiments demonstrating the actual behavior? Could you show them?
On a system with systemd (or where /proc/sys/kernel/core_pattern is configured to pipe to a program), run ulimit -c 0, then run a program that segfaults (writing int main() { *(volatile int *)0; } in a segfault.c file and running gcc segfault.c; ./a.out should be sufficient). This creates a core dump, despite RLIMIT_CORE being 0.
Quoted 1 line
And do you suggest any specific patch for that page?
Something like adding ", unless the system is configured to pipe core dumps to a program" in that bullet point should be sufficient.
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[Bug 216648] man 5 core incorrectly states circumstances in which a core is not produced
In reply to [email protected]https://bugzilla.kernel.org/show_bug.cgi?id=216648
Luca Versari ([email protected]) changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |CODE_FIX--- Comment #3 from Luca Versari ([email protected]) --- I believe this has been fixed now.
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