Repository navigation
Some python tests are crashing with segmentation fault when running on debug build #7941
Description
Summary
$ cargo run -- -m test.test_ssl ThreadedTests.test_socketserver
Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
Running `target/debug/rustpython -m test.test_ssl ThreadedTests.test_socketserver`
test_ssl: testing with 'OpenSSL 3.3.0 (rustls/0.23)' (3, 3, 0, 0, 15)
under 'Linux-6.19.14-400.asahi.fc44.aarch64+16k-aarch64-with-glibc2.43'
HAS_SNI = True
OP_ALL = 0x bfb
OP_NO_TLSv1_1 = 0x10000000
server (('127.0.0.1', 34577):34577 ('TLS_AES_256_GCM_SHA384', 'TLSv1.3', 256)):
[20/May/2026 23:23:31] "GET /test_ssl.py HTTP/1.1" 200 -
Segmentation fault (core dumped) RUST_BACKTRACE=1 cargo run -- -m test.test_ssl ThreadedTests.test_socketserver
Following patch circumvents this, so I believe it is a stack overflow really:
diff --git a/Lib/test/ssl_servers.py b/Lib/test/ssl_servers.py
index 15b071e04dda..8d9331c6705f 100644
--- a/Lib/test/ssl_servers.py
+++ b/Lib/test/ssl_servers.py
@@ -125,6 +125,7 @@ def __init__(self, context, host=HOST, handler_class=None):
handler_class or RootedHTTPRequestHandler,
context)
self.port = self.server.server_port
+ threading.stack_size(1024 * 1024 * 128)
threading.Thread.__init__(self)
self.daemon = TrueExpected
No segmentation fault.
Actual
Segmentation fault.
Python Documentation
N/A
Activity
fanninpm commentedon May 20, 2026
Do you believe this to be a bug in CPython?
im-0 commentedon May 20, 2026
No, it is a RustPython bug. Patch for the test case is just to demonstrate that it is a stack overflow.
JamesClarke7283 commentedon May 27, 2026
take
Scope thread stack size override to debug builds only
Add regression test for debug thread stack size
Fix stack overflow segfault on debug builds for Python threads
Scope thread stack size override to debug builds only
Add regression test for debug thread stack size