From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 30748 invoked by alias); 23 Feb 2006 20:10:45 -0000 Received: (qmail 30741 invoked by uid 22791); 23 Feb 2006 20:10:44 -0000 X-Spam-Status: No, hits=-1.3 required=5.0 tests=AWL,BAYES_50 X-Spam-Check-By: sourceware.org Received: from fmr21.intel.com (HELO scsfmr001.sc.intel.com) (143.183.121.13) by sourceware.org (qpsmtpd/0.31) with ESMTP; Thu, 23 Feb 2006 20:10:43 +0000 Received: from scsfmr101.sc.intel.com (scsfmr101.sc.intel.com [10.3.253.10]) by scsfmr001.sc.intel.com (8.12.10/8.12.10/d: major-outer.mc,v 1.1 2004/09/17 17:50:56 root Exp $) with ESMTP id k1NKAgi6021936 for ; Thu, 23 Feb 2006 20:10:42 GMT Received: from unix-os.sc.intel.com (unix-os.sc.intel.com [172.25.110.7]) by scsfmr101.sc.intel.com (8.12.10/8.12.10/d: major-inner.mc,v 1.2 2004/09/17 18:05:01 root Exp $) with ESMTP id k1NK5UZc031960; Thu, 23 Feb 2006 20:05:30 GMT Received: (from askeshav@localhost) by unix-os.sc.intel.com (8.11.6/8.11.2) id k1NKAfb02441; Thu, 23 Feb 2006 12:10:41 -0800 Date: Thu, 23 Feb 2006 20:10:00 -0000 From: Keshavamurthy Anil S To: Systemtap Cc: anil.s.keshavamurthy@intel.com Subject: Kprobes might be stealing int3 Message-ID: <20060223121040.A2253@unix-os.sc.intel.com> Reply-To: Keshavamurthy Anil S Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i X-Scanned-By: MIMEDefang 2.52 on 10.3.253.10 X-IsSubscribed: yes Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm Precedence: bulk List-Subscribe: List-Post: List-Help: , Sender: systemtap-owner@sourceware.org X-SW-Source: 2006-q1/txt/msg00600.txt.bz2 Hi, I tried running the below program on both x86_64 and i386 and on both architecture, if the kernel is compiled with CONFIG_KPROBES, my below application segmentation faults. On kernel where CONFIG_KPROBES set to N, the same test program passes. Here goes the test program... ------------------------- #include #include void my_trap(int sig) { printf("Test passed, all OK\n"); exit(0); } int main() { signal(SIGTRAP, my_trap); asm volatile (".byte 0xcd,3"); printf("Stolen interrupt, very bad!\n"); } ----------------------------------