Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755767AbYH0Vpc (ORCPT ); Wed, 27 Aug 2008 17:45:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753164AbYH0VpV (ORCPT ); Wed, 27 Aug 2008 17:45:21 -0400 Received: from nf-out-0910.google.com ([64.233.182.184]:10375 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752635AbYH0VpT (ORCPT ); Wed, 27 Aug 2008 17:45:19 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=date:from:to:cc:subject:message-id:references:mime-version :content-type:content-disposition:in-reply-to:user-agent; b=T/h+xt8TBVWElc1c2EPmr+Zs96C1mye83Dk4Lfs6X6Hsfhl4PUMBzf+20q3swNqsAG wGzi0Mxss/+FqtE/BAENK19Whc/Mg/lcdwRnGy41GnPRLXiTvfAjJ1N6owXUEC/1fhq7 mjxk4dMaxePJh05m8AvspqEnvrvf/eVW+MYVU= Date: Thu, 28 Aug 2008 01:46:52 +0400 From: Alexey Dobriyan To: Roland McGrath Cc: Linus Torvalds , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] utrace core Message-ID: <20080827214652.GA32163@x200.localdomain> References: <20080826220102.89635154233@magilla.localdomain> <20080826220157.397C7154233@magilla.localdomain> <20080826225519.GC27724@x200.localdomain> <20080827213211.GA31861@x200.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080827213211.GA31861@x200.localdomain> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2785 Lines: 50 On Thu, Aug 28, 2008 at 01:32:11AM +0400, Alexey Dobriyan wrote: > > And run to confirm that attach/detach/exec program still crashes it. > > There is PREEMPT_RCU now so it will be even more not funny. > > As promised, quickly reproducible via expt_ptratt.c: Another one: kernel BUG at kernel/utrace.c:2275! invalid opcode: 0000 [1] PREEMPT SMP DEBUG_PAGEALLOC last sysfs file: /sys/kernel/slab/utrace_attached_engine/objects CPU 0 Modules linked in: xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack ip_tables xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 sr_mod cdrom Pid: 5118, comm: exe Tainted: G W 2.6.27-rc4-next-20080827-utrace #5 RIP: 0010:[] [] utrace_get_signal+0x6ff/0x710 RSP: 0018:ffff88017ace5c98 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff88017aced910 RCX: ffff88017e2b23c0 RDX: ffffffffffffffff RSI: ffff88017ace5cf8 RDI: ffff88017acc5640 RBP: ffff88017ace5d38 R08: 0000000000000002 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff88017aced908 R14: ffff88017aced900 R15: ffff88017acc5640 FS: 0000000000000000(0000) GS:ffffffff80551600(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fff249c8bc9 CR3: 000000017ad2c000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process exe (pid: 5118, threadinfo ffff88017ace4000, task ffff88017acc5640) Stack: ffff88017ace5ef8 0000000000000002 0000000000000000 ffff88017ace5ef8 ffff88017ace5e78 ffff88017ace5f58 ffff88017e206288 0000000000000400 0000000000000401 ffff88017e206848 0000001000000000 0000000000010000 Call Trace: [] get_signal_to_deliver+0x24c/0x310 [] do_notify_resume+0xd4/0x860 [] ? check_bytes_and_report+0x38/0xd0 [] ? sys_execve+0x5b/0x80 [] ? check_object+0x223/0x250 [] ? init_object+0x51/0x90 [] ? trace_hardirqs_on+0xd/0x10 [] ? sys_execve+0x5b/0x80 [] int_signal+0x12/0x17 Code: 00 00 48 89 41 10 48 8b 82 20 01 00 00 48 89 41 18 e9 5e fa ff ff 0f 0b eb fe 48 8b 75 80 4c 89 ff e8 e6 e5 ff ff e9 28 fd ff ff <0f> 0b eb fe 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 RIP [] utrace_get_signal+0x6ff/0x710 RSP ---[ end trace 4eaa2a86a8e2da22 ]--- -- 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/