[Bug 259971] lib.libc.regex.exhaust_test.regcomp_too_big fails with ASLR on by default

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259971

--- Comment #11 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=938915a22c84af88afa587694e8d63ce9dd202f4

commit 938915a22c84af88afa587694e8d63ce9dd202f4
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-01-27 21:08:35 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-01-27 21:08:35 +0000

    netbsd-tests: Fix regcomp_too_big flakiness

    The test sometimes crashes with ASLR enabled.  This seems to happen when
    regcomp() grows the process stack and happens to run into the virtual
    memory limit set at the beginning of the test.  ASLR triggers the
    problem since it introduces a bit of fragmentation and thus introduces
    cases where stack allocation can be the trigger of virtual memory
    exhaustion, rather than dynamic memory allocation in regcomp().

    Make the test stable by priming the stack before doing anything else.
    This effectively reserves 16MB of virtual memory for the stack, which in
    practice is enough to make the test stable on amd64.

    PR:             259971
    Reviewed by:    ngie, emaste
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D54880

 contrib/netbsd-tests/lib/libc/regex/t_exhaust.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

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