From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39807) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WVJ6s-00045w-8D for qemu-devel@nongnu.org; Wed, 02 Apr 2014 07:13:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WVJ6m-0004px-AP for qemu-devel@nongnu.org; Wed, 02 Apr 2014 07:13:34 -0400 Received: from mail-bk0-f54.google.com ([209.85.214.54]:40972) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WVJ6m-0004pl-0t for qemu-devel@nongnu.org; Wed, 02 Apr 2014 07:13:28 -0400 Received: by mail-bk0-f54.google.com with SMTP id 6so20892bkj.41 for ; Wed, 02 Apr 2014 04:13:27 -0700 (PDT) Message-ID: <533BF0DB.70100@m2r.biz> Date: Wed, 02 Apr 2014 13:13:31 +0200 From: Fabio Fantoni MIME-Version: 1.0 References: <533AD4BE.8080101@m2r.biz> <533AE841.1000606@redhat.com> In-Reply-To: <533AE841.1000606@redhat.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Qemu 2.0 regression with xen: qemu crash on any domUs S.O. start List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Laszlo Ersek , xen-devel , "qemu-devel@nongnu.org" Il 01/04/2014 18:24, Laszlo Ersek ha scritto: > On 04/01/14 17:01, Fabio Fantoni wrote: >> Today I tried latest qemu 2.0 compiled from git (commit >> 63678e17cf399ff81b93417fe7bee8d6ef6b6b1b) on this dom0: >> Debian 7 (Wheezy) 64 bit with kernel from package >> linux-image-3.2.0-4-amd64 version 3.2.54-2 and all dependency packages >> for xen, spice and usb redirection. >> Seabios 1.7.3-3, spice 0.12.4-0nocelt2 and usbredir 0.6-2 compiled from >> debian unstable sources. >> The xen-unstable upstream commit is >> 4787f667bcee205c56a27da59b766a53e1e929eb, plus these patches not upstream: >> tools: various things just to build test >> tools: Improve make debball >> libxl: Add qxl vga interface support for upstream qemu >> libxl: add basic spice support for pv domUs >> >> Qemu crashes always on domU S.O. start, on both pv and hvm domUs. >> >> Same dom0 with qemu 1.6 from xen-unstable repository used for some tests >> yesterday and was full working. >> I also update seabios to 1.7.4-4 compiled from debian unstable sources >> but the problem persists. >> >> I looked on dom0 logs, qemu logs and xl dmesg and I found only a qemu >> segfault related on each domU in dom0 syslog, for example the latest: >> [ 844.273170] qemu-system-i38[3545]: segfault at 8 ip 00007fa905dcc4c1 >> sp 00007fff41220810 error 4 in qemu-system-i386[7fa905ad5000+598000] >> >> If you need more informations, tests and/or logs tell me and I'll post >> them. > Whoever looks into this would be greatly helped: > - if you bisected the issue (between 1.6 and 2.0-rcX), I tried time ago qemu 1.7 and qemu 2.0 on start of development without problem on domUs start but I'll retry. > - if you posted qemu's backtrace at the sigsegv. I tried to use gdb following this old post: https://lists.gnu.org/archive/html/qemu-devel/2011-12/msg02575.html but with same changes: /usr/lib/xen/bin# vi qemu-system-i386 #!/bin/sh exec gdbserver 0.0.0.0:1234 /usr/lib/xen/bin/qemu-system-i386.bak "$@" gdb /usr/lib/xen/bin/qemu-system-i386.bak target remote localhost:1234 This command with gdb on qemu fails: xl -vvv create /etc/xen/wheezy.cfg ... libxl: error: libxl_dm.c:1378:device_model_spawn_outcome: domain 13 device model: spawn failed (rc=-3) libxl: error: libxl_create.c:1207:domcreate_devmodel_started: device model did not start: -3 libxl: debug: libxl_dm.c:1485:kill_device_model: Device Model signaled ... the dom0 syslog show segfault also in this case and the qemu log is different on first lines (probably for gdbserver): less /var/log/xen/qemu-dm-wheezy.log Process /usr/lib/xen/bin/qemu-system-i386.bak created; pid = 8238 Listening on port 1234 Remote debugging from host 127.0.0.1 xc: error: linux_gnttab_set_max_grants: ioctl SET_MAX_GRANTS failed (22 = Invalid argument): Internal error xen be: qdisk-51712: xc_gnttab_set_max_grants failed: Invalid argument gdb on xl create show: (gdb) target remote localhost:1234 Remote debugging using localhost:1234 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 0x00007ffff7dddaf0 in ?? () from /lib64/ld-linux-x86-64.so.2 (gdb) (gdb) bt full #0 0x00007ffff7dddaf0 in ?? () from /lib64/ld-linux-x86-64.so.2 No symbol table info available. #1 0x0000000000000013 in ?? () No symbol table info available. #2 0x00007fffffffe871 in ?? () No symbol table info available. #3 0x00007fffffffe897 in ?? () No symbol table info available. #4 0x00007fffffffe8a2 in ?? () No symbol table info available. #5 0x00007fffffffe8a5 in ?? () No symbol table info available. #6 0x00007fffffffe8ae in ?? () No symbol table info available. #7 0x00007fffffffe8ef in ?? () No symbol table info available. #8 0x00007fffffffe8f4 in ?? () No symbol table info available. #9 0x00007fffffffe913 in ?? () No symbol table info available. #10 0x00007fffffffe91f in ?? () No symbol table info available. #11 0x00007fffffffe92b in ?? () No symbol table info available. #12 0x00007fffffffe931 in ?? () ---Type to continue, or q to quit--- the qemu include debug and is not stripped: file /usr/lib/xen/bin/qemu-system-i386.bak /usr/lib/xen/bin/qemu-system-i386.bak: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.26, BuildID[sha1]=0x5aa043b5524d74d166ead62527343080384d586b, not stripped and I also tried: aptitude install libc6-dbg but same result. I not understand what I missed for correct xl create and/or gdb informations. Can someone help me please? Thanks for any reply > > Laszlo > >