From 9eba3aafa6c26994a301965ef8ddca0ada5f85c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C5=91rinc?= <pap.lorinc@gmail.com>
Date: Fri, 24 Jul 2026 12:45:09 -0700
Subject: [PATCH] test: avoid undersized Boost.Test signal stacks

Boost.Test registers a `SIGSTKSZ` alternate signal stack as each test binary starts, before any tests run.
On musl, this can be smaller than Linux's hardware-dependent minimum, causing `sigaltstack()` to fail with `ENOMEM` during setup.

Disable Boost.Test's alternate stack in both test entry points.
Signal handlers continue to use the regular process stack. Boost.Test can no longer report stack overflows.

Fixes #36026

Co-authored-by: MarcoFalke <*~=`'#}+{/-|&$^_@721217.xyz>
---
 src/test/kernel/test_kernel.cpp | 2 ++
 src/test/main.cpp               | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/src/test/kernel/test_kernel.cpp b/src/test/kernel/test_kernel.cpp
index 8b919c918fb..884c6912bf5 100644
--- a/src/test/kernel/test_kernel.cpp
+++ b/src/test/kernel/test_kernel.cpp
@@ -7,6 +7,8 @@
 #include <util/byte_units.h>
 #include <util/fs.h>
 
+// Boost.Test's SIGSTKSZ alternate stack can be smaller than Linux requires on musl.
+#define BOOST_TEST_DISABLE_ALT_STACK
 #define BOOST_TEST_MODULE Bitcoin Kernel Test Suite
 #include <boost/test/included/unit_test.hpp>
 
diff --git a/src/test/main.cpp b/src/test/main.cpp
index 398ab4d6bd7..ae64d814562 100644
--- a/src/test/main.cpp
+++ b/src/test/main.cpp
@@ -5,6 +5,8 @@
 /**
  * See https://www.boost.org/doc/libs/1_78_0/libs/test/doc/html/boost_test/adv_scenarios/single_header_customizations/multiple_translation_units.html
  */
+// Boost.Test's SIGSTKSZ alternate stack can be smaller than Linux requires on musl.
+#define BOOST_TEST_DISABLE_ALT_STACK
 #define BOOST_TEST_MODULE Bitcoin Core Test Suite
 
 #include <boost/test/included/unit_test.hpp>