travis: generate/show coredumps from pytests.

test/pyhttpd/env.py

@@ -443,6 +443,7 @@ def install_test_conf(self, lines: List[str]):
         with open(self._test_conf, 'w') as fd:
             fd.write('\n'.join(self._httpd_base_conf))
             fd.write('\n')
+            fd.write(f"CoreDumpDirectory {self._server_dir}\n")
             if self._verbosity >= 2:
                 fd.write(f"LogLevel core:trace5 {self.mpm_module}:trace5\n")
             if self._log_interesting:

test/travis_run_linux.sh

@@ -114,6 +114,7 @@ if ! test -v SKIP_TESTING; then
 
     # Try to keep all potential coredumps from all processes
     sudo sysctl -w kernel.core_uses_pid=1 2>/dev/null || true
+    ulimit -c unlimited 2>/dev/null || true
 
     if ! test -v NO_TEST_FRAMEWORK; then
         if test -v WITH_TEST_SUITE; then
@@ -266,7 +267,7 @@ if ! test -v SKIP_TESTING; then
         fi
     fi
 
-    for core in `ls test/perl-framework/t/core{,.*} 2>/dev/null`; do
+    for core in `ls test/perl-framework/t/core{,.*} test/gen/apache/core{,.*} 2>/dev/null`; do
         gdb -ex 'thread apply all backtrace full' -batch ./httpd "$core"
         RV=5
     done