From: "jkenisto at us dot ibm dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sources.redhat.com
Subject: [Bug runtime/5051] backtrace() in return probes are failed on ia64
Date: Fri, 21 Sep 2007 07:07:00 -0000 [thread overview]
Message-ID: <20070920215104.31341.qmail@sourceware.org> (raw)
In-Reply-To: <20070920194025.5051.mhiramat@redhat.com>
------- Additional Comments From jkenisto at us dot ibm dot com 2007-09-20 21:51 -------
I can't say for sure whether there's an ia64-specific problem here. But the
fact that kretprobes messes up stack backtraces is documented. Search for
"stack backtraces" in Documentation/kprobes.txt.
This limitation could be fixed, or at least mitigated, by adding a function to
kprobes that returns the return address from the Nth kretprobe_instance for the
indicated task in that task's bucket in kretprobe_inst_table[]. (Keep in mind
that if you have multiple kretprobes on the same function, only one of the
kretprobe_instances will have the true return address; the others will have the
kretprobe trampoline address.)
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5051
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next prev parent reply other threads:[~2007-09-20 21:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-20 21:35 [Bug runtime/5051] New: " mhiramat at redhat dot com
2007-09-21 7:07 ` jkenisto at us dot ibm dot com [this message]
2007-09-24 17:47 ` [Bug runtime/5051] " hunt at redhat dot com
2007-11-13 7:19 ` shaohua dot li at intel dot com
2007-11-19 21:19 ` mhiramat at redhat dot com
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