From: "jakub at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: dwz@sourceware.org
Subject: [Bug default/27213] alt_clear_dups: Assertion `child->die_dup == NULL' failed.
Date: Wed, 20 Jan 2021 20:13:22 +0000 [thread overview]
Message-ID: <bug-27213-11298-rUxdx8QdhS@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-27213-11298@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=27213
--- Comment #3 from Jakub Jelinek <jakub at redhat dot com> ---
(In reply to Mark Wielaard from comment #1)
> It doesn't help with this case. But reviewing the code I found that there
> was at least one place where we didn't hash the DW_FORM_implicit_const value
> in checksum_die meaning that two DIEs which only differed in an attribute
> (which we didn't already handle specially) using a DW_FORM_implicit_const
> with a different value (maybe a DW_AT_byte_size) could possibly hash to the
> same value.
>
> diff --git a/dwz.c b/dwz.c
> index 308bcba..e556dfb 100644
> --- a/dwz.c
> +++ b/dwz.c
> @@ -3580,7 +3580,11 @@ checksum_die (DSO *dso, dw_cu_ref cu, dw_die_ref
> top_die, dw_die_ref die)
> ptr += ptr_size;
> break;
> case DW_FORM_flag_present:
> + break;
> case DW_FORM_implicit_const:
> + if (! handled)
> + die->u.p1.die_hash
> + = iterative_hash_object (t->values[i], die->u.p1.die_hash);
> break;
> case DW_FORM_flag:
> case DW_FORM_data1:
As for this patch, I agree that something should be done about it,
but wonder if it shouldn't be
if (!handled && die->die_ck_state != CK_BAD)
{
handled = true;
die->u.p1.die_hash
= iterative_hash_object (t->values[i], die->u.p1.die_hash);
}
--
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next prev parent reply other threads:[~2021-01-20 20:13 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 10:23 [Bug default/27213] New: " jakub at redhat dot com
2021-01-20 15:46 ` [Bug default/27213] " mark at klomp dot org
2021-01-20 20:03 ` jakub at redhat dot com
2021-01-20 20:13 ` jakub at redhat dot com [this message]
2021-01-20 20:22 ` jakub at redhat dot com
2021-01-20 20:34 ` jakub at redhat dot com
2021-01-20 20:48 ` mark at klomp dot org
2021-01-20 20:53 ` mark at klomp dot org
2021-01-21 7:58 ` jakub at redhat dot com
2021-02-08 15:52 ` mark at klomp dot org
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