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h1994st avatar h1994st commented on August 18, 2024

How do you generate the corpus (i.e., files in testcases/others/js/)? It seems the mutation operation is applied to an empty grammar tree.

The error might be thrown from here:

Grammar-Mutator/src/tree_mutation.c

Lines 202 to 209 in cbe5e32

node_t *node = node_pick_non_term_subnode(mutated_tree->root);
if (unlikely(node == NULL)) {
// By design, _pick_non_term_node should not return NULL
perror("_pick_non_term_node returns NULL");
exit(EXIT_FAILURE);
}

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agoodm88 avatar agoodm88 commented on August 18, 2024

I am also trying to fuzz javascript using Grammar Mutator and a customised grammar file. The process starts off great but within a day or two I perpetually run into the fuzzer crashing as described here.

In my case I am not adding any additional test cases other than the trees generated by Grammar Mutator and am at a loss as to what is going wrong. From what I can see; only the mater process is crashing for me.

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shafouz avatar shafouz commented on August 18, 2024

try and run with a new empty output directory and an input directory generated from the
grammar_generator-YOURGRAMMAR
binary.
I had the same problem and this worked for me

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