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From: "godlygeek at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: elfutils-devel@sourceware.org
Subject: [Bug libdw/29430] `dwarf_getscopes` fails after a8493c1
Date: Fri, 29 Jul 2022 18:53:13 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29430

Matt Wozniski <godlygeek at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |NOTABUG

--- Comment #1 from Matt Wozniski <godlygeek at gmail dot com> ---
Well - nevermind. Our problem turned out not to be an issue with
`dwarf_getscopes` at all, but a bug in our unwinder that only occurred when
`dwarf_getscopes` finds 0 scopes. Our buggy code was working with elfutils
0.179 because `dwarf_getscopes` would erroneously return extra scopes due to
DIE trees being visited multiple times, and we'd ignore those scopes because
`dwarf_tag(scope) !=3D DW_TAG_inlined_subroutine`, but our bug that trigger=
s only
when 0 scopes are found wouldn't occur.

After `dwarf_getscopes` was fixed, it began returning 0 when it previously
hadn't, and our code failed to properly handle that case in a way that had
never been noticed.

Sorry for the false alarm!

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