From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 20882 invoked by alias); 27 Jan 2012 15:10:51 -0000 Received: (qmail 20870 invoked by uid 22791); 27 Jan 2012 15:10:49 -0000 X-SWARE-Spam-Status: No, hits=-2.8 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO sourceware.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 27 Jan 2012 15:10:36 +0000 From: "dsmith at redhat dot com" To: systemtap@sourceware.org Subject: [Bug uprobes/13539] occasional oops, kernel SEGV, RHEL5, :uprobes:uprobe_free_process+0xba/0x131 Date: Fri, 27 Jan 2012 15:10:00 -0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: systemtap X-Bugzilla-Component: uprobes X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dsmith at redhat dot com X-Bugzilla-Status: RESOLVED X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: systemtap at sourceware dot org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://sourceware.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2012-q1/txt/msg00060.txt.bz2 http://sourceware.org/bugzilla/show_bug.cgi?id=13539 --- Comment #11 from David Smith 2012-01-27 15:09:46 UTC --- I ran the unprivileged_myproc.exp in a loop last night on 2 borrowed systems: 1) RHEL5 (2.6.18-305.el5debug - x86_64) - Each test run takes normally around 13-15 minutes to complete on this system. But, this system only made it through 13 iterations of the test (in around 10 hours). Looking through the /var/log/messages, I see this: Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: INFO: task stapio:16032 blocked for mor e than 120 seconds. Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: "echo 0 > /proc/sys/kernel/hung_task_ti meout_secs" disables this message. Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: stapio D ffff8101bcd64088 0 16032 16029 16038 (NOTLB) Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: ffff81018fe09dc8 0000000000000046 0000 000000000000 0000000000000046 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: ffff8101bce008d0 0000000000000007 ffff 81018fc3e080 ffff8101bd0cc600 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: 00001edff65e7937 000000000000178f ffff 81018fc3e268 000000018be2c720 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: Call Trace: Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] :uprobes:__unregi ster_uprobe+0x1ef/0x22f Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] autoremove_wake_f unction+0x0/0x2e Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] :stap_9846269314f b177561661c8b9fe159f3_2043:_stp_cleanup_and_exit+0x140/0x311 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] :stap_9846269314f b177561661c8b9fe159f3_2043:_stp_ctl_write_cmd+0xf1/0xdbd Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] file_has_perm+0x4 8/0xa3 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] vfs_write+0xce/0x 174 Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] sys_write+0x45/0x 6e Jan 27 04:05:23 hp-sl2x170zg6-02 kernel: [] tracesys+0xd5/0xd f It is possible this is a separate problem. 2) On RHEL6 (2.6.32-220.4.1.el6.x86_64.debug), the system did 57 iterations with no OOPS. However, I do see the following in /var/log/messages: Jan 27 01:41:01 dell-pe1955-01 kernel: Slab corruption (Not tainted): utrace_engine start=ffff880037ae5c88, len=56 Jan 27 01:41:01 dell-pe1955-01 kernel: Redzone: 0x9f911029d74e35b/0x9f911029d74e35b. Jan 27 01:41:01 dell-pe1955-01 kernel: Last user: [](__utrace_engine_release+0x39/0x50) Jan 27 01:41:01 dell-pe1955-01 kernel: 020: e0 9c 54 81 ff ff ff ff 6b 6b 6b 6b 6b 6b 6b 6b Jan 27 01:41:01 dell-pe1955-01 kernel: 030: 01 00 00 00 00 00 00 00 Jan 27 01:41:01 dell-pe1955-01 kernel: Prev obj: start=ffff880037ae5c38, len=56 Jan 27 01:41:01 dell-pe1955-01 kernel: Redzone: 0xd84156c5635688c0/0xd84156c5635688c0. Jan 27 01:41:01 dell-pe1955-01 kernel: Last user: [](utrace_attach_task+0xba/0x2b0) Jan 27 01:41:01 dell-pe1955-01 kernel: 000: 01 00 00 00 5a 5a 5a 5a 00 00 00 00 00 00 00 00 Jan 27 01:41:01 dell-pe1955-01 kernel: 010: 08 86 7a c7 00 88 ff ff e8 8c 7a c7 00 88 ff ff Jan 27 01:41:02 dell-pe1955-01 kernel: Next obj: start=ffff880037ae5cd8, len=56 Jan 27 01:41:02 dell-pe1955-01 kernel: Redzone: 0xd84156c5635688c0/0xd84156c5635688c0. Jan 27 01:41:02 dell-pe1955-01 kernel: Last user: [](utrace_attach_task+0xba/0x2b0) Jan 27 01:41:02 dell-pe1955-01 kernel: 000: 01 00 00 00 5a 5a 5a 5a 00 00 00 00 00 00 00 00 Jan 27 01:41:02 dell-pe1955-01 kernel: 010: e8 5c ae 37 00 88 ff ff e8 5c ae 37 00 88 ff ff -- Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug.