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* bug#48907: Debug symbols file name discrepancies
@ 2021-06-07 18:19 Maxim Cournoyer
  2021-06-07 19:26 ` Maxim Cournoyer
  2021-06-18  9:29 ` Ludovic Courtès
  0 siblings, 2 replies; 9+ messages in thread
From: Maxim Cournoyer @ 2021-06-07 18:19 UTC (permalink / raw)
  To: 48907

Hello,

While attempting to debug a crash in jami-qt, I've noticed that GDB
would fail to load the symbol tables of the shared libraries it uses,
for example qtdeclarative.

It seems that grafts are to blame.  Let's start by looking at the debug
files found for the qtdeclarative libQt5Qml.so.5 shared library:

--8<---------------cut here---------------start------------->8---
$ guix build qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
substitute: updating substitutes from 'http://127.0.0.1:8080'... 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
The following files will be downloaded:
   /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug
   /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2
substituting /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug...
downloading from https://ci.guix.gnu.org/nar/lzip/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug ...
 qtdeclarative-5.15.2-debug  94.9MiB                            1.2MiB/s 01:21 [##################] 100.0%

The following graft will be made:
   /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
applying 2 grafts for /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv ...
grafting '/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug' -> '/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug'...
grafting '/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2' -> '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2'...
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/bin/qml'
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/bin/q
[...]
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtQuick/Window.2/libwindowplugin.so'
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtTest/libqmltestplugin.so'
successfully built /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug/lib/debug/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2.debug
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15
--8<---------------cut here---------------end--------------->8---

So far so good.  The file hierarchy under the debug output matches the
actual shared library file name.  Next, let's verify which qtdeclarative
shared libraries jami-qt is dynamically linked against:

--8<---------------cut here---------------start------------->8---
$ guix build jami-qt | tail -1 | xargs -I{} ldd {}/bin/.jami-qt-real | grep qtdeclarative
        libQt5QuickWidgets.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5QuickWidgets.so.5 (0x00007fb9e38a8000)
        libQt5Quick.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5Quick.so.5 (0x00007fb9dba47000)
        libQt5QmlModels.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5QmlModels.so.5 (0x00007fb9db9c3000)
        libQt5Qml.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5Qml.so.5 (0x00007fb9dae4e000)
--8<---------------cut here---------------end--------------->8---

Oops!  The actual store file name of the libQt5Qml.so.5 known to jami-qt
is *not* the same as the one obtained earlier, which explains why GDB
doesn't find its symbols.  Without grafts, the first command gives:

--8<---------------cut here---------------start------------->8---
$ guix build --no-grafts qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug/lib/debug/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2.debug
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2
--8<---------------cut here---------------end--------------->8---

Which still doesn't match the libraries jami-qt is linked with.

I'm out of ideas for now.  Would someone have a clue?

Thank you!

Maxim




^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2021-10-04 13:15 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-07 18:19 bug#48907: Debug symbols file name discrepancies Maxim Cournoyer
2021-06-07 19:26 ` Maxim Cournoyer
2021-06-18  9:29 ` Ludovic Courtès
2021-09-24  2:32   ` bug#48907: Grafts cause discrepancies in debug symbols file names (debug symbols missing in GDB) Maxim Cournoyer
2021-09-24 14:14     ` Ludovic Courtès
2021-09-28  2:25       ` Maxim Cournoyer
2021-09-28  9:45         ` Ludovic Courtès
2021-09-28 10:28           ` Ludovic Courtès
2021-10-04 13:14         ` Ludovic Courtès

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