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[Bug dynamic-link/15311] New: _dl_sort_fini static deps can be violated by dynamic ones
- From: "dhatch at ilm dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Wed, 27 Mar 2013 07:49:25 +0000
- Subject: [Bug dynamic-link/15311] New: _dl_sort_fini static deps can be violated by dynamic ones
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=15311
Bug #: 15311
Summary: _dl_sort_fini static deps can be violated by dynamic
ones
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: dynamic-link
AssignedTo: unassigned@sourceware.org
ReportedBy: dhatch@ilm.com
Classification: Unclassified
_dl_sort_fini tries to honor static dependencies
at the expense of relocation (dynamic) dependencies, when there is a conflict.
But the code that does this is rather half-hearted--
it only ignores a dynamic dependency
if the dynamic dependency directly contradicts
a single static dependency, per the following comment
in the loop over dynamic dependencies in elf/dl-fini.c:
/* If a cycle exists with a link time dependency,
preserve the latter. */
In even slightly more complex situations,
e.g. a mixed cycle of length 3 (consisting of at least one
static and at least one dynamic dependency),
no preference is given to the static dep(s);
the cycle is broken arbitrarily and so the static dep may be violated,
even if there are no cycles at all in the static dependency graph.
If static dependencies really are more important than dynamic ones,
it might be a good idea to give them preference in a more principled way.
If the sorting routine gets overhauled
(as I think it needs to be, due to currently absurd asymptotic behavior,
see bug 15310)
it would be good to keep this in mind.
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