Re: [GIT PULL] tracing: Fixes for v6.17

[Steven Rostedt]

On Fri, 22 Aug 2025 14:23:11 -0700
Nathan Chancellor <nathan@xxxxxxxxxx> wrote:

> > Actually, can you see if this fixes the bug you are seeing?  
> 
> Yes, it does.
> 
> Tested-by: Nathan Chancellor <nathan@xxxxxxxxxx>

Ah, that patch isn't good, as iter->hash must be non NULL going forward,
otherwise it thinks it failed to allocated.

Could you test this one instead?

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f992a5eb878e..a69067367c29 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -4662,7 +4662,10 @@ ftrace_regex_open(struct ftrace_ops *ops, int flag,
 			iter->hash = alloc_and_copy_ftrace_hash(size_bits, hash);
 		}
 	} else {
-		iter->hash = alloc_and_copy_ftrace_hash(hash->size_bits, hash);
+		if (hash)
+			iter->hash = alloc_and_copy_ftrace_hash(hash->size_bits, hash);
+		else
+			iter->hash = EMPTY_HASH;
 	}
 
 	if (!iter->hash) {


Thanks,

-- Steve