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[Bug translator/9816] functioncallcount.stp causes system crash
- From: "ananth at in dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 10 Feb 2009 10:17:25 -0000
- Subject: [Bug translator/9816] functioncallcount.stp causes system crash
- References: <20090204113414.9816.ananth@in.ibm.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From ananth at in dot ibm dot com 2009-02-10 10:17 -------
Our observations so far:
a. Powerpc instruction emulation had a bug. Patch submitted to fix it
(http://ozlabs.org/pipermail/linuxppc-dev/2009-February/068062.html)
b. functioncallcount.stp as it exists probes calls and inlines. That is a
problem -- at least on powerpc with the upstream kernel, set/clear/*_bit (part
of arch/powerpc/include/asm/bitops.h) shouldn't be probed. Its not clear how to
add a set of inline functions in a header file in the blacklist in one go.
c. Maybe its best not to allow routines in bitops.h to be traced?
d. The functioncallcount.stp needs to be modified to just probe .call and not
inlines.
Comments?
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9816
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