Merge pull request #2887 from laloch/sudo-permission-error

Fix exception when trying to send SIGSTOP to finished sudo child

news/TEMPLATE.rst

@@ -6,6 +6,10 @@
 
 **Removed:** None
 
-**Fixed:** None
+**Fixed:**
+
+* Fixed a bug which under very rare conditions could cause the shell
+  to die with PermissionError exception while sending SIGSTOP signal
+  to a child process.
 
 **Security:** None

xonsh/proc.py

@@ -2419,7 +2419,10 @@ def pause_call_resume(p, f, *args, **kwargs):
         hasattr(p, "send_signal") and ON_POSIX and not ON_MSYS and not ON_CYGWIN
     )
     if can_send_signal:
-        p.send_signal(signal.SIGSTOP)
+        try:
+            p.send_signal(signal.SIGSTOP)
+        except PermissionError:
+            pass
     try:
         f(*args, **kwargs)
     except Exception: