From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BiJG4-0007KE-7v for user-mode-linux-devel@lists.sourceforge.net; Wed, 07 Jul 2004 13:43:12 -0700 Received: from mail.scgiservices.com ([198.107.3.67]) by sc8-sf-mx1.sourceforge.net with esmtp (TLSv1:AES256-SHA:256) (Exim 4.34) id 1BiJG3-00014K-RY for user-mode-linux-devel@lists.sourceforge.net; Wed, 07 Jul 2004 13:43:12 -0700 Received: from SCG2 (dyn170.CONET.OUS.EDU [140.211.15.170]) (using TLSv1 with cipher RC4-MD5 (128/128 bits)) (No client certificate requested) by mail.scgiservices.com (Postfix) with ESMTP id 1CF2C2A3A5 for ; Wed, 7 Jul 2004 13:43:10 -0700 (PDT) From: "Anthony Brock" Subject: RE: [uml-devel] uml_mconsole issue Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" In-Reply-To: <200407071914.06387.blaisorblade_spam@yahoo.it> Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Wed, 7 Jul 2004 13:43:07 -0700 Content-Transfer-Encoding: quoted-printable To: user-mode-linux-devel@lists.sourceforge.net Okay, I think I have it. I shouldn't have issued the "handle SIGSEGV..." command. This backtrace was generated on Kernel 2.6.7 during the 5th time I issuing the following command on the host: uml_mconsole bind2 proc uptime *** BEGIN BACKTRACE *** dns2 login: Program received signal SIGSEGV, Segmentation fault. 0xa00730df in link_path_walk (name=3D0xa0a59ca9 "uptime", nd=3D0xa3fd3aa4) = at fs/namei.c:591 591 lookup_flags =3D LOOKUP_FOLLOW; (gdb) bt #0 0xa00730df in link_path_walk (name=3D0xa0a59ca9 "uptime", nd=3D0xa3fd3a= a4) at fs/namei.c:591 #1 0xa00227de in mconsole_proc (req=3D0xa0a59c08) at arch/um/drivers/mconsole_kern.c:152 #2 0xa0022584 in mc_work_proc (unused=3D0x0) at arch/um/drivers/mconsole_kern.c:67 #3 0xa004162c in worker_thread (__cwq=3D0xa039084c) at kernel/workqueue.c:= 172 #4 0xa00448dc in kthread (_create=3D0xa3fdfb14) at kernel/kthread.c:90 #5 0xa00154da in run_kernel_thread (fn=3D0xa0044850 , arg=3D0xa3fdfb14, jmp_ptr=3D0x0) at arch/um/kernel/process.c:294 #6 0xa001f6ac in new_thread_handler (sig=3D10) at arch/um/kernel/skas/process_kern.c:130 #7 #8 0xa01e305d in syscall () at slab.h:92 #9 0x00000000 in ?? () #10 0x00000000 in ?? () #11 0x00000000 in ?? () #12 0x00000000 in ?? () #13 0x00000000 in ?? () #14 0x00000000 in ?? () #15 0x00000000 in ?? () #16 0x00000000 in ?? () #17 0x00000000 in ?? () #18 0x00000000 in ?? () #19 0x00000000 in ?? () #20 0x00000000 in ?? () #21 0x00000000 in ?? () #22 0x00000000 in ?? () #23 0x00000000 in ?? () #24 0xa01caca4 in sigemptyset (set=3D0x0) at sigempty.c:34 Previous frame inner to this frame (corrupt stack?) (gdb) c Continuing. Breakpoint 1, panic (fmt=3D0xa0224f96 "Segfault with no mm") at kernel/panic.c:58 58 bust_spinlocks(1); (gdb) c Continuing. Kernel panic: Segfault with no mm Program exited with code 01. (gdb) c The program is not being run. (gdb) quit $ *** END BACKTRACE *** Hope this helps! Tony > -----Original Message----- > From: BlaisorBlade [mailto:blaisorblade_spam@yahoo.it] > Sent: Wednesday, July 07, 2004 10:14 AM > To: Anthony Brock; user-mode-linux-devel@lists.sourceforge.net > Subject: Re: [uml-devel] uml_mconsole issue > > > Alle 07:14, mercoled=EC 7 luglio 2004, Anthony Brock ha scritto: > > Let me know if you require more detail and what specific steps I should > > take to help trouble-shoot this. Thanks in advance! > Could you try taking a "backtrace" from the UML? I've no time for now to > explain it, but it has been explained tons of times on this ML... > search for > "backtrace" on the marc.theaimsgroup.com archives! See also the > "debugging > kernel" page (the subsection about skas). > -- > Paolo Giarrusso, aka Blaisorblade > Linux registered user n. 292729 > > ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 -=20 digital self defense, top technical experts, no vendor pitches,=20 unmatched networking opportunities. Visit www.blackhat.com _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel