Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756110AbYHSJ7i (ORCPT ); Tue, 19 Aug 2008 05:59:38 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756040AbYHSJ7Q (ORCPT ); Tue, 19 Aug 2008 05:59:16 -0400 Received: from smtp1.extricom.com ([212.235.24.249]:57369 "HELO smtp.extricom.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1755964AbYHSJ7N (ORCPT ); Tue, 19 Aug 2008 05:59:13 -0400 Message-ID: <48AA98E4.6060606@extricom.com> Date: Tue, 19 Aug 2008 12:56:52 +0300 From: Eran Liberty User-Agent: Thunderbird 2.0.0.14 (X11/20080502) MIME-Version: 1.0 To: Mathieu Desnoyers CC: Steven Rostedt , linux-kernel@vger.kernel.org, "Paul E. McKenney" , linuxppc-dev@ozlabs.org, rostedt@goodmis.org Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) References: <48591941.4070408@extricom.com> <48A92E15.2080709@extricom.com> <48A9901B.1080900@redhat.com> <48A9BEA3.10906@extricom.com> <20080818184158.GA1798@Krystal> In-Reply-To: <20080818184158.GA1798@Krystal> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2470 Lines: 67 Mathieu Desnoyers wrote: > Can you check if, at some point during the system execution (starting > from boot), 0xdd5b1d58 is an address where a module is loaded ? (the > module can be later unloaded, what I wonder is if this address would > appear to have had a loaded+unloaded module). > > Actually, could you try to compile your kernel without "MODULE_UNLOAD" ? > > Mathieu > No modules... ~ # uname -a Linux 2.6.27-rc2 #6 Tue Aug 19 12:33:34 IDT 2008 ppc unknown ~ # gunzip /proc/config.gz -c | grep UNLOAD # CONFIG_MODULE_UNLOAD is not set ~ # gunzip /proc/config.gz -c | grep FTRACE CONFIG_HAVE_FTRACE=y CONFIG_HAVE_DYNAMIC_FTRACE=y CONFIG_FTRACE=y CONFIG_DYNAMIC_FTRACE=y CONFIG_FTRACE_SELFTEST=y CONFIG_FTRACE_STARTUP_TEST=y ~ # gunzip /proc/config.gz -c | grep MARKERS CONFIG_MARKERS=y ~ # lsmod Module Size Used by ~ # while [ 1 ] ; do find / > /dev/null ; echo . ; done . Oops: Exception in kernel mode, sig: 11 [#1] Exsw1600 Modules linked in: NIP: c00bb724 LR: c00bb724 CTR: 00000000 REGS: d8b59c50 TRAP: 0700 Not tainted (2.6.27-rc2) MSR: 00029000 CR: 24082282 XER: 20000000 TASK = dbc68de0[1712] 'find' THREAD: d8b58000 GPR00: 00000000 d8b59d00 dbc68de0 dd801180 d8b59d68 d8b59d58 dd8019db 100234ec GPR08: c0800000 00019330 0000ffff d8b59d20 24000288 100ad874 100936f8 1008a1d0 GPR16: 10083f80 d8b59e2c d8b59d68 fffffff4 c0380000 d8b59d60 d8b59d58 dd802084 GPR24: ddc69500 dd802018 d8b59d68 c0380000 dd801180 d8b59d68 00000000 d8b59d00 NIP [c00bb724] d_lookup+0x40/0x90 LR [c00bb724] d_lookup+0x40/0x90 Call Trace: [d8b59d00] [d8b59d58] 0xd8b59d58 (unreliable) [d8b59d20] [c00ae7c8] do_lookup+0xe8/0x220 [d8b59d50] [c00b0684] __link_path_walk+0x5a4/0xd54 [d8b59dc0] [c00b0e8c] path_walk+0x58/0xe0 [d8b59df0] [c00b0ffc] do_path_lookup+0x78/0x13c [d8b59e20] [c00b1cf8] user_path_at+0x64/0xac [d8b59e90] [c00a8c98] vfs_lstat_fd+0x34/0x74 [d8b59ec0] [c00a8d6c] vfs_lstat+0x30/0x48 [d8b59ed0] [c00a8db4] sys_lstat64+0x30/0x5c [d8b59f40] [c0010554] ret_from_syscall+0x0/0x3c Instruction dump: 7c0802a6 bf61000c 3f60c038 7c3f0b78 90010024 7c7c1b78 7c9d2378 83db32a0 73c00001 7f83e378 7fa4eb78 4082002f <00000000> 2f830000 409e0030 801b32a0 ---[ end trace 7766edd310cd3442 ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/