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[Bug tapsets/4592] access to $bio ioblock.request probe in ioblock.stp fails
- From: "wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 4 Jun 2007 20:52:59 -0000
- Subject: [Bug tapsets/4592] access to $bio ioblock.request probe in ioblock.stp fails
- References: <20070604192454.4592.wcohen@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From wcohen at redhat dot com 2007-06-04 20:52 -------
The following probe show $bio as being zero, need to determine whether this is
due to faulty debuginfo or bad code generated for accessing function arguments.
#! stap
global teststr
probe begin { log("systemtap starting probe") }
probe end {
log("systemtap ending probe")
printf("%s", teststr)
}
probe kernel.function ("generic_make_request")
{
printf ("bio = %p \n", $bio);
}
$ ../../install/bin/stap -k /tmp/ioblocktest2.stp
systemtap starting probe
bio = 0x0000000000000000
bio = 0x0000000000000000
bio = 0x0000000000000000
...
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4592
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