From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264278AbUHNRhA (ORCPT ); Sat, 14 Aug 2004 13:37:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264371AbUHNRhA (ORCPT ); Sat, 14 Aug 2004 13:37:00 -0400 Received: from rproxy.gmail.com ([64.233.170.198]:51903 "EHLO mproxy.gmail.com") by vger.kernel.org with ESMTP id S264278AbUHNRg5 (ORCPT ); Sat, 14 Aug 2004 13:36:57 -0400 Message-ID: <2a4f155d0408141036e114001@mail.gmail.com> Date: Sat, 14 Aug 2004 20:36:57 +0300 From: =?ISO-8859-1?Q?ismail_d=F6nmez?= Reply-To: =?ISO-8859-1?Q?ismail_d=F6nmez?= To: Linux Kernel Mailing List Subject: Latest 2.6 kernels broke debugging of threaded applications Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi all, I am having weird problems with gdb & latest 2.6 kernels I tested 2.6.6,.2.6.7,.2.6.8 and they all have the same problem. When I try to debug a threaded application in gdb applications freezes and gdb doesn't output anything. strace shows this interesting piece at the point the application freezes : --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now [RTMIN]) wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP}], 0, NULL) = 17055 ptrace(PTRACE_GETREGS, 17055, 0, 0xbfffea60) = 0 ptrace(PTRACE_PEEKUSER, 17055, offsetof(struct user, u_debugreg) + 24, [0xffff4ff0]) = 0 ptrace(PTRACE_PEEKTEXT, 17055, 0x4000af40, [0x5de58955]) = 0 ptrace(PTRACE_PEEKTEXT, 17055, 0x4000af40, [0x5de58955]) = 0 ptrace(PTRACE_POKEDATA, 17055, 0x4000af40, 0x5de589cc) = 0 ptrace(PTRACE_CONT, 17055, 0, SIG_0) = 0 wait4(-1, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGTRAP} | 0x30000], 0, NULL) = 17055 --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now [RTMIN]) --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now [RTMIN]) ptrace(0x4201 /* PTRACE_??? */, 17055, 0, 0xbfffec08) = 0 wait4(17062, [{WIFSTOPPED(s) && WSTOPSIG(s) == SIGSTOP}], __WCLONE, NULL) = 17062 ptrace(PTRACE_DETACH, 17062, 0, SIG_0) = 0 wait4(-1, Debugging works fine with 2.4.26 and 2.6.8-rc4-mm1. Any ideas? P.S: I am on a Slackware 10 box. Cheers, ismail -- Time is what you make of it