From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <systemtap-return-22566-listarch-systemtap=sources.redhat.com@sourceware.org>
Received: (qmail 31670 invoked by alias); 25 Jun 2014 21:28:58 -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 31617 invoked by uid 48); 25 Jun 2014 21:28:53 -0000
From: "jlebon at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/17091] New: pr16806.exp sometimes hangs on RHEL6
Date: Wed, 25 Jun 2014 21:28:00 -0000
X-Bugzilla-Reason: AssignedTo
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: systemtap
X-Bugzilla-Component: runtime
X-Bugzilla-Version: unspecified
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jlebon 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-17091-6586@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: 2014-q2/txt/msg00282.txt.bz2

https://sourceware.org/bugzilla/show_bug.cgi?id=17091

            Bug ID: 17091
           Summary: pr16806.exp sometimes hangs on RHEL6
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: jlebon at redhat dot com

This is related to PR16806 and possibly PR17027. It seems like the RHEL6 kernel
doesn't like the pr16806.exp testcase:

$ # Create modloop.ko and causes stap to load uprobes module
$ stap -m modloop -e 'probe process("./loop").function("ibar") {
println("entered ibar"); exit() }' -c /bin/true

$ # Repeat this staprun command multiple times until it hangs (takes ~8 runs
here)
$ staprun modloop.ko -c "timeout 1 ./loop"

On dmesg, we get the following after a while:

INFO: task stapio:12563 blocked for more than 120 seconds.
      Not tainted 2.6.32-431.20.3.el6.i686 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
stapio        D 00000002     0 12563   6814 0x00000080
 f338daa0 00000086 00000001 00000002 cae0873c f48fcacc 00000000 00009b4e
 00000000 f66f6900 000002d0 00000001 000002d0 c0b6b700 c0b6b700 f338dd48
 c0b6b700 c0b67064 c0b6b700 f338dd48 ef90c000 c0870720 00000000 c0441cca
Call Trace:
 [<c0441cca>] ? check_preempt_curr+0x5a/0x70
 [<c0450575>] ? try_to_wake_up+0x205/0x3a0
 [<c060b813>] ? rwsem_wake+0x53/0x120
 [<c047da6b>] ? prepare_to_wait+0x5b/0x60
 [<f8628575>] ? __unregister_uprobe+0x1f5/0x220 [uprobes]
 [<c047d750>] ? autoremove_wake_function+0x0/0x40
 [<fb235fcb>] ? _stp_cleanup_and_exit+0x17b/0x300 [modloop]
 [<c0470c96>] ? group_send_sig_info+0x46/0x60
 [<fb237a30>] ? _stp_ctl_write_cmd+0x120/0xce0 [modloop]
 [<c05bfe27>] ? selinux_file_permission+0xe7/0x130
 [<c05b4cec>] ? security_file_permission+0xc/0x10
 [<c0536c56>] ? rw_verify_area+0x66/0xe0
 [<fb237910>] ? _stp_ctl_write_cmd+0x0/0xce0 [modloop]
 [<c0536d70>] ? vfs_write+0xa0/0x190
 [<c05376f1>] ? sys_write+0x41/0x70
 [<c08606e4>] ? syscall_call+0x7/0xb

It seems like the __unregister_uprobe() call is hanging for some reason.

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