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From: "gprocida at google dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug default/26646] unexpected declaration-only types
Date: Mon, 07 Feb 2022 21:15:10 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26646

--- Comment #15 from gprocida at google dot com ---
Hi Dodji.

I collected shortest paths from symbols to struct udp_table in the ABI for
vmlinux4 and I've traced one by hand through the DWARF DIEs (readelf
--debug-dump) for vmlinux3:

function symbol dev_get_by_name (in ksymtab) has a parameter of type struct=
 net
*=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20
struct net has member rtln of type struct sock *=20=20=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
struct sock has member sk_prot_creator of type struct proto *=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
struct proto has member h of an anonymous union type=20=20=20=20=20=20=20=
=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20
the anonymous union type has member udp_table of type struct udp_table *=20=
=20=20=20=20=20=20=20
struct udp_table is fully defined

If you can see why this path is not being considered by the DWARF reader, I
think the fix will address more than just this one instance.

Regards,
Giuliano.

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