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[Bug tapsets/4592] New: 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 19:24:54 -0000
- Subject: [Bug tapsets/4592] New: access to $bio ioblock.request probe in ioblock.stp fails
- Reply-to: sourceware-bugzilla at sourceware dot org
When running the systemtap.samples/ioblocktest.stp, the test fails when
running. It appears to make in invalid access through a pointer.
stap
/home/wcohen/stap_snap_200706041620/src/testsuite/systemtap.samples/ioblocktest.stp
systemtap starting probe
ERROR: pointer dereference fault near identifier '$bio' at
/home/wcohen/stap_snap_200706041620/install/share/systemtap/tapset/ioblock.stp:115:33
WARNING: Number of errors: 1, skipped probes: 0
Looking through the ioblock.stp the section of code in question is:
probe ioblock.request = kernel.function ("generic_make_request")
{
devname = __bio_devname($bio) //problem here
ino = __bio_ino($bio)
...
The __bio_devname function is the following (noticed the line with the "FIXME":
/* returns the block device name */
function __bio_devname:string(bio:long)
%{
char b[BDEVNAME_SIZE];
struct bio *bio = (struct bio *)(long)THIS->bio;
struct block_device *bdev = kread(&(bio->bi_bdev));
if (bdev == NULL) {
strlcpy(THIS->__retvalue, "N/A", MAXSTRINGLEN);
} else {
const char *name = bdevname(bdev, b); /* FIXME: deref hazard! */
deref_string(THIS->__retvalue, name, MAXSTRINGLEN);
}
CATCH_DEREF_FAULT();
%}
--
Summary: access to $bio ioblock.request probe in ioblock.stp
fails
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: tapsets
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: wcohen at redhat dot com
GCC host triplet: ia64
http://sourceware.org/bugzilla/show_bug.cgi?id=4592
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