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Reverse-debugging with Intel PT not working

From: Jack Henschel <jackdev at mailbox dot org>
To: gdb at sourceware dot org
Date: Mon, 21 Aug 2017 16:48:35 +0200
Subject: Reverse-debugging with Intel PT not working
Authentication-results: sourceware.org; auth=none

Hi,

I'm running Linux 4.9.30 (Debian Stretch), with GDB 8.0 (compiled from source, with './configure --with-intel-pt'). libipt is present and gdb is linked against it.
I'm running an Intel Xeon CPU E5-2680 v4 (which supports Intel PT, the flag is also present in '/proc/cpuinfo').

However, when I'm trying to do a record-and-play session, I get the error message "Target does not support branch tracing":
$ gcc -g crash.c
$ gdb -q ./a.out
(gdb) start
...
(gdb) record btrace pt
Target does not support branch tracing.

Any idea why this happens?
I have seen https://sourceware.org/ml/gdb/2016-09/msg00029.html and my setup fullfills are requirements.

Greetings
Jack

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