[PATCH RFC][makedumpfile 02/10] dwarf_info: Fix a infinite recursion bug for search_domain

[YAMAZAKI MASAMITSU(山崎 真光)]

On 2025/06/10 18:57, Tao Liu wrote:
> There is an infinite recursion bug noticed in rust symbols. The root cause is
> unclear to me. This patch will avoid the bug by skip the recursion of rust
> symbols, since currently we don't need to deal with those.
>
> Signed-off-by: Tao Liu <ltao at redhat.com>
> ---
>   dwarf_info.c | 15 ++++++++-------
>   1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/dwarf_info.c b/dwarf_info.c
> index a3a2fd6..73842ab 100644
> --- a/dwarf_info.c
> +++ b/dwarf_info.c
> @@ -837,7 +837,7 @@ search_symbol(Dwarf_Die *die, int *found)
>   }
>   
>   static void
> -search_domain(Dwarf_Die *die, int *found)
> +search_domain(Dwarf_Die *die, int *found, int lang)
>   {
>   	int tag;
>   	const char *name;
> @@ -859,10 +859,11 @@ search_domain(Dwarf_Die *die, int *found)
>   			if (is_container(&die_type)) {
>   				Dwarf_Die child;
>   
> -				if (dwarf_child(&die_type, &child) != 0)
> +				if (dwarf_child(&die_type, &child) != 0 ||
> +				    lang == DW_LANG_Rust)
>   					continue;
>   
> -				search_domain(&child, found);
> +				search_domain(&child, found, lang);
>   
>   				if (*found)
>   					return;
> @@ -924,7 +925,7 @@ search_die(Dwarf_Die *die, int *found)
>   }
>   
>   static void
> -search_die_tree(Dwarf_Die *die, int *found)
> +search_die_tree(Dwarf_Die *die, int *found, int lang)
>   {
>   	Dwarf_Die child;
>   
> @@ -932,7 +933,7 @@ search_die_tree(Dwarf_Die *die, int *found)
>   	 * start by looking at the children
>   	 */
>   	if (dwarf_child(die, &child) == 0)
> -		search_die_tree(&child, found);
> +		search_die_tree(&child, found, lang);
>   
>   	if (*found)
>   		return;
> @@ -950,7 +951,7 @@ search_die_tree(Dwarf_Die *die, int *found)
>   		search_typedef(die, found);
>   
>   	else if (is_search_domain(dwarf_info.cmd))
> -		search_domain(die, found);
> +		search_domain(die, found, lang);
>   
>   	else if (is_search_die(dwarf_info.cmd))
>   		search_die(die, found);
> @@ -1007,7 +1008,7 @@ get_debug_info(void)
>   			ERRMSG("Can't get CU die.\n");
>   			goto out;
>   		}
> -		search_die_tree(&cu_die, &found);
> +		search_die_tree(&cu_die, &found, dwarf_srclang(&cu_die));
>   		if (found)
>   			break;
>   		off = next_off;

Hi Liu

This problem need to be solve. But I don't know how to reproduce.
If Your server is running rust program. Or Or is it running as a
module by rust? Please tell me how to reproduce it.

Thanks,
Masa