On Sat, 2 Oct 2021 18:04:10 +0000
Al Viro [off-list ref] wrote:

quoted

@@ -610,6 +611,9 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 
 	print_oops_end_marker();
 
+	if (pkill_on_warn && system_state >= SYSTEM_RUNNING)
+		do_group_exit(SIGKILL);
+  

Wait a sec...  do_group_exit() is very much not locking-neutral.
Aren't you introducing a bunch of potential deadlocks by adding
that?

Perhaps add an irq_work() here to trigger the do_group_exit() from a
"safe" interrupt context?

-- Steve