dt: disable core dumps

tests/rptest/services/redpanda.py

@@ -423,7 +423,7 @@ def to_cli(self, *, dedicated_node):
 
         :return: 2 tuple of strings, first goes before the binary, second goes after it
         """
-        preamble = "ulimit -Sc unlimited"
+        preamble = "ulimit -Sc 0"
         preamble += f" -Sn {self._nfiles}; " if self._nfiles else "; "
 
         if self._num_cpus is None and not dedicated_node:
@@ -2597,10 +2597,7 @@ def __init__(self,
 
         self._cloud_storage_client: S3Client | ABSClient | None = None
 
-        # enable asan abort / core dumps by default
-        self._environment = dict(
-            ASAN_OPTIONS=
-            "abort_on_error=1:disable_coredump=0:unmap_shadow_on_exit=1")
+        self._environment = dict()
 
         # If lsan_suppressions.txt exists, then include it
         if os.path.exists(LSAN_SUPPRESSIONS_FILE):