From: Jan Kratochvil <jan.kratochvil@redhat.com>
To: Bogdan Harjoc <harjoc@gmail.com>
Cc: gdb@sourceware.org
Subject: Re: Adding a missing NT_FILES note to a core file so gdb can load solibs for it
Date: Mon, 25 Jan 2016 14:22:00 -0000 [thread overview]
Message-ID: <20160125142226.GA5665@host1.jankratochvil.net> (raw)
In-Reply-To: <CAF4+tmrNC8WbrECU8jqx8cS3k_BE9kbvphc=4LYWs6WX5m_PUg@mail.gmail.com>
On Mon, 25 Jan 2016 15:06:05 +0100, Bogdan Harjoc wrote:
> So I'd like to ask whether this has any chance of working.
No. GDB does not support NT_FILE reading. GDB follows DT_DEBUG:
readelf -d execbinary|grep -w DEBUG
Besides that it would not be completely correct, depending on the point of
view. mmap()ped shared library will be present in NT_FILE but GDB will not
shows it as it was not dlopen()ed (either by a call or via DT_NEEDED).
When GDB cannot read shared libraries it usually means your executable does
not exactly match the one that was core dumped. To make them matching one
should match build-id from the core file with that of the executable:
eu-unstrip -n --core=corefile
readelf -n execbinary|grep -A1 NT_GNU_BUILD_ID
IIRC ld-linux.so also needs to match, I cannot remember why now.
Jan
next prev parent reply other threads:[~2016-01-25 14:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-25 14:06 Bogdan Harjoc
2016-01-25 14:22 ` Jan Kratochvil [this message]
2016-01-25 15:56 ` Bogdan Harjoc
2016-01-25 16:01 ` Jan Kratochvil
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