From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <systemtap-return-21163-listarch-systemtap=sources.redhat.com@sourceware.org>
Received: (qmail 8215 invoked by alias); 30 Aug 2013 20:32:30 -0000
Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <systemtap.sourceware.org>
List-Subscribe: <mailto:systemtap-subscribe@sourceware.org>
List-Post: <mailto:systemtap@sourceware.org>
List-Help: <mailto:systemtap-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: systemtap-owner@sourceware.org
Received: (qmail 8183 invoked by uid 48); 30 Aug 2013 20:32:26 -0000
From: "dsmith at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug tapsets/15913] New: on s390x, nd_syscall.execve fails when accessing filename
Date: Fri, 30 Aug 2013 20:32:00 -0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: systemtap
X-Bugzilla-Component: tapsets
X-Bugzilla-Version: unspecified
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dsmith at redhat dot com
X-Bugzilla-Status: NEW
X-Bugzilla-Priority: P2
X-Bugzilla-Assigned-To: systemtap at sourceware dot org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter
Message-ID: <bug-15913-6586@http.sourceware.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://sourceware.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-q3/txt/msg00208.txt.bz2

https://sourceware.org/bugzilla/show_bug.cgi?id=15913

            Bug ID: 15913
           Summary: on s390x, nd_syscall.execve fails when accessing
                    filename
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com

When using the 'filename' convenience variable from 'execve', the
syscall.execve probe works correctly on s390x:

====
# stap -e 'probe syscall.execve { printf("%s\n", filename) }' -c "sleep 0.2"
/usr/lib64/qt-3.3/bin/sleep
/usr/local/sbin/sleep
/usr/local/bin/sleep
/usr/sbin/sleep
/usr/bin/sleep
====

However, the nd_syscall.execve probe gets a copy fault:

====
# stap -e 'probe nd_syscall.execve { printf("%s\n", filename) }' -c "sleep 0.2"
ERROR: user string copy fault -14 at 0000000028ef1648 near identifier
'user_string_n' at /usr/local/share/systemtap/tapset/uconversions.stp:120:10
WARNING: Number of errors: 1, skipped probes: 1
WARNING: /usr/local/bin/staprun exited with status: 1
Pass 5: run failed.  [man error::pass5]
====

(I'm sure this has something to do with the odd s390x argument passing.
Normally, if you are in a syscall, the 'orig_gpr2' register has the 1st
argument, while in a regular kernel function the 'r2' register has the 1st
argument.)

-- 
You are receiving this mail because:
You are the assignee for the bug.