Populate suppressions.txt, fix test_capi fails

Author: StanFromIreland

.github/workflows/reusable-san.yml

@@ -61,7 +61,7 @@ jobs:
               || ''
             }}.txt handle_segv=0" >> "$GITHUB_ENV"
         else
-          echo "UBSAN_OPTIONS=${SAN_LOG_OPTION} halt_on_error=1 suppressions=${GITHUB_WORKSPACE}/Tools/ubsan/suppressions.txt" >> "$GITHUB_ENV"
+          echo "UBSAN_OPTIONS=${SAN_LOG_OPTION} halt_on_error=1 handle_segv=0 handle_sigfpe=0 handle_sigbus=0 suppressions=${GITHUB_WORKSPACE}/Tools/ubsan/suppressions.txt" >> "$GITHUB_ENV"
         fi
         echo "CC=clang" >> "$GITHUB_ENV"
         echo "CXX=clang++" >> "$GITHUB_ENV"

Tools/build/compute-changes.py

@@ -123,11 +123,7 @@ class Outputs:
 
 def compute_changes() -> None:
     target_ref, head_ref = git_refs()
-    if True:
-        outputs = Outputs(
-            run_ubuntu=True,
-        )
-    elif os.environ.get("GITHUB_EVENT_NAME", "") == "pull_request":
+    if os.environ.get("GITHUB_EVENT_NAME", "") == "pull_request":
         # Getting changed files only makes sense on a pull request
         files = get_changed_files(target_ref, head_ref)
         outputs = process_changed_files(files)

Tools/ubsan/suppressions.txt

@@ -1,2 +1,23 @@
+# This file contains suppressions for the UndefinedBehaviour sanitizer.
+#
+# When adding a suppression, include a comment referencing a GitHub issue
+# that describes how to reproduce the race and includes the relevant UBSan
+# output.
+
 null:Objects/object.c
 bool:Objects/memoryobject.c
+
+# Modules/binascii.c:1243:42: runtime error: left shift of 128 by 24 places cannot be represented in type 'int'
+shift:Modules/binascii.c
+
+# Modules/_ctypes/cfield.c:644:1: runtime error: left shift of 1 by 63 places cannot be represented in type 'int64_t' (aka 'long')
+shift:Modules/_ctypes/cfield.c
+
+# Modules/_zstd/decompressor.c:598:56: runtime error: applying non-zero offset 18446744073709551615 to null pointer
+pointer-overflow:Modules/_zstd/decompressor.c
+
+# Modules/_io/stringio.c:350:24: runtime error: addition of unsigned offset to 0x7fd01ec25850 overflowed to 0x7fd01ec2584c
+pointer-overflow:Modules/_io/stringio.c
+
+# Objects/bytesobject.c:1190:25: runtime error: applying zero offset to null pointer
+pointer-overflow:Objects/bytesobject.c