Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933516Ab1ETGol (ORCPT ); Fri, 20 May 2011 02:44:41 -0400 Received: from mail-qw0-f46.google.com ([209.85.216.46]:42720 "EHLO mail-qw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933375Ab1ETGok convert rfc822-to-8bit (ORCPT ); Fri, 20 May 2011 02:44:40 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=G206E0s1nhGSAxUeY1YOlWBUKnXbdQpamAGRTFu89k7TUNqQo8KW8AcqpHQls+Byct +Ijw9LffWT73jKVhrE3IsSLb1ta2AX3z/QlCIcMHbFDrn85mX7jIZWjkhpVqodyWqwFV +aKAyCf0sXspm7ApyNUG1gmiVqnKCxV42hyQI= MIME-Version: 1.0 In-Reply-To: <201105191834.56577.toralf.foerster@gmx.de> References: <201105191526.31904.toralf.foerster@gmx.de> <201105191834.56577.toralf.foerster@gmx.de> Date: Fri, 20 May 2011 08:44:39 +0200 Message-ID: Subject: Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine) From: richard -rw- weinberger To: =?ISO-8859-1?Q?Toralf_F=F6rster?= Cc: LKML , user-mode-linux-devel@lists.sourceforge.net Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1977 Lines: 62 Hi, a few more questions/ideas. :) 2011/5/19 Toralf F?rster : > FWIW I got : > > * Starting local What is this "Starting local", was UML crashing while starting your distro? > Kernel panic - not syncing: Segfault with no mm > 08335ed4: ?[<082b0b3b>] dump_stack+0x22/0x24 > 08335eec: ?[<082b0ba0>] panic+0x63/0x167 > 08335f14: ?[<080614af>] segv+0x27f/0x2f0 > 08335fcc: ?[<08061561>] segv_handler+0x41/0x60 > 08335fec: ?[<08071da4>] sig_handler_common+0x44/0xb0 > > > EIP: 0000:[<00000000>] CPU: 0 Not tainted EFLAGS: 00000000 > ? ?Not tainted > EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000 > ESI: 00000000 EDI: 00000000 EBP: 00000000 DS: 0000 ES: 0000 > 08335e88: ?[<0807935d>] show_regs+0xed/0x120 > 08335ea4: ?[<0806179c>] panic_exit+0x2c/0x50 > 08335eb4: ?[<080a2b9c>] notifier_call_chain+0x4c/0x70 > 08335edc: ?[<080a2c13>] atomic_notifier_call_chain+0x23/0x30 > 08335eec: ?[<082b0bc8>] panic+0x8b/0x167 > 08335f14: ?[<080614af>] segv+0x27f/0x2f0 > 08335fcc: ?[<08061561>] segv_handler+0x41/0x60 > 08335fec: ?[<08071da4>] sig_handler_common+0x44/0xb0 > > > and gdb gives in another session to reproduce the bug this: > > (gdb) c > Continuing. GDB stopped here and UML got SIGSEGV after you continued? GDB has to ignore SIGSEGV. UML uses this signal to handle page faults. type: handle SIGSEGV noprint nostop pass I fear the backtrace is garbage. Can you reproduce the issue using the default config? Are you using hostfs? What exactly is the output when it crashes? (Without GDB) Your host's kernel ring buffer should contain a line like this one after the crash: linux[123]: segfault at 0 ip xxx sp xxx error 4 in linux[xxx+yyy] Please share this line with me. -- Thanks, //richard -- 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/