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Re: [PATCH] libdw: Make sure Ebl is always freed from cfi frame cache.
- From: Mark Wielaard <mjw at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Fri, 27 Nov 2015 15:00:24 +0100
- Subject: Re: [PATCH] libdw: Make sure Ebl is always freed from cfi frame cache.
On Thu, 2015-11-19 at 12:37 +0100, Mark Wielaard wrote:
> libdwfl sets the Dwfl_Module Ebl for the eh_cfi and dwarf_cfi cache to
> save a bit of memory. It also calls ebl_closebackend on the ebl to free
> it. The Dwarf_CFI never frees the Ebl in the cache, even when it opened
> one itself. This means that if only libdw calls are used to access the
> Dwarf_CFI the Ebl might be leaked.
> Always destroy the Dwarf_CFI cache Ebl in __libdw_destroy_frame_cache.
> And in __libdwfl_module_free clear the Dwarf_CFI Ebl if it is the
> Dwfl_Module Ebl before calling dwarf_cfi_end and dwarf_end.
I pushed this to elfutils master.
Masami, please let me know if you need any help with the other leaks you
found in perf using libdw.