main/python3: increase thread stack size

we segfault before we hit the sys.getrecurslimit(), which is bad. Some
testing showed that to be able to reach the default
sys.getrecurslimit(), which is 1000, we need at least a 453k stack on
x86_64. We set it to 1MB so we have a bit extra.

It is also worth to note that upstream set stacksize to 4MB on freebsd
and 5MB on OSX.

ref #8134
https://github.com/docker-library/python/issues/211

1 files changed, 21 insertions, 2 deletions

diff --git a/main/python3/APKBUILD b/main/python3/APKBUILD
index e6daf5e699..bc812ba54f 100644
--- a/main/python3/APKBUILD
+++ b/main/python3/APKBUILD
@@ -5,7 +5,7 @@ pkgname=python3
 # the python2-tkinter's pkgver needs to be synchronized with this.
 pkgver=3.6.3
 _basever="${pkgver%.*}"
-pkgrel=7
+pkgrel=8
 pkgdesc="A high-level scripting language"
 url="http://www.python.org"
 arch="all"
@@ -56,11 +56,30 @@ build() {
 		--with-system-ffi \
 		--with-threads
 
-	make EXTRA_CFLAGS="$CFLAGS"
+	# set thread stack size to 1MB so we don't segfault before we hit
+	# sys.getrecursionlimit()
+	make EXTRA_CFLAGS="$CFLAGS -DTHREAD_STACK_SIZE=0x100000"
 }
 
 check() {
 	cd "$builddir"
+
+	# test that we reach recursionlimit before we segfault
+	cat > test-stacksize.py <<-EOF
+	import threading
+	import sys
+
+	def fun(i):
+	  try:
+	    fun(i+1)
+	  except:
+	    sys.exit(0)
+
+	t = threading.Thread(target=fun, args=[1])
+	t.start()
+EOF
+	LD_LIBRARY_PATH=$PWD ./python test-stacksize.py
+
 	local fail
 
 	# musl related