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http://sourceware.org/ml/gdb-patches/2016-03/msg00246.html
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Subject: [patch] Suggest running gdbserver for a PID in container
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--azLHFNyN32YCQGCU
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Content-Type: text/plain; charset=us-ascii
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Content-Disposition: inline
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Hi,
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currently
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gdb -p <pid from a container>
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will print:
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warning: Target and debugger are in different PID namespaces; thread lists and other data are likely unreliable
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BTW it is a bit lost in all the other messages. Full screen output is in:
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https://sourceware.org/bugzilla/show_bug.cgi?id=19828
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It correctly states the problem but it does not say how to solve it.
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Is at least this little suggestion OK?
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Originally I wanted to suggest also the Docker "-p 1234:1234" parameter but
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I see the containers are more general topic than just Docker (even LxC etc.).
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According to Gary future GDBs should be able to work even without gdbserver.
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But currently gdbserver is still required.
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Thanks,
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Jan
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--azLHFNyN32YCQGCU
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Content-Type: text/plain; charset=us-ascii
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Content-Disposition: inline; filename=1
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gdb/ChangeLog
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2016-03-15 Jan Kratochvil <jan.kratochvil@redhat.com>
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* linux-thread-db.c (check_pid_namespace_match): Extend the message.
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Index: gdb-7.6.1/gdb/linux-thread-db.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/linux-thread-db.c 2016-03-17 22:06:28.765832372 +0100
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+++ gdb-7.6.1/gdb/linux-thread-db.c 2016-03-17 22:07:06.918107721 +0100
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@@ -1265,7 +1265,8 @@
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{
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warning (_ ("Target and debugger are in different PID "
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"namespaces; thread lists and other data are "
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- "likely unreliable"));
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+ "likely unreliable. "
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+ "Connect to gdbserver inside the container."));
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}
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xfree (our_pid_ns);
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