From: Jan Kiszka <jan.kiszka@domain.hid>
To: Philippe Gerum <rpm@xenomai.org>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: [Xenomai-core] x86_64: problems with syscall tracing?
Date: Sun, 11 Nov 2007 18:25:38 +0100 [thread overview]
Message-ID: <47373B12.7020808@domain.hid> (raw)
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Philippe,
you recently said there is a bug in the x86_64 support when syscall
tracing is enabled. Now I think I stepped on it as well: In order to
validate my APIC frequency patches for that arch, I wanted to use LTTng
there. But as soon as I start the trace, the latency test fails to run,
prematurely exiting due to a segfault. Gdb and the kernel say that user
land jumped to address 0, I just yet failed to find out where they come
from. I strongly assume LTTng enables syscall tracing, because its
entry/exit instrumentations are inside the hook function
(syscall_trace_entry/leave).
Do you have any further details on your tracing issue? Does may
observation correlates with yours?
Jan
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next reply other threads:[~2007-11-11 17:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-11 17:25 Jan Kiszka [this message]
2007-11-11 17:32 ` [Xenomai-core] x86_64: problems with syscall tracing? Philippe Gerum
2007-11-11 17:45 ` Jan Kiszka
2007-11-11 20:16 ` Gilles Chanteperdrix
2007-11-12 9:20 ` Jan Kiszka
2007-12-21 12:15 ` Jan Kiszka
2007-12-23 14:24 ` Philippe Gerum
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