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Xen crash
by Nicolas Sahlqvist 09 Oct '07

09 Oct '07

Hi Centos-virt, I'm new to this list and joined since I am volunteering as a tech admin for a non profit organization called CouchSurfing (.com) where we tried to move the web servers to Xen zones and this has proven quite unstable since the our defined zones tends to crash on a daily basis with the latest CentOS 5 Xen updates. The physical boxes have 2 quad core 1.6GHz Xeon CPU's and 4 GB RAM, there is currently only 1 domain on each box, configured with 2.2GB RAM. Domain 0: [root@nd10254 ~]# rpm -qa | grep xen xen-libs-3.0.3-25.0.4.el5 kernel-xen-2.6.18-8.1.8.el5 kernel-xen-2.6.18-8.1.14.el5 xen-3.0.3-25.0.4.el5 Web1: [root@web1 ~]# rpm -qa | grep xen kernel-xen-2.6.18-8.1.8.el5 kernel-xen-2.6.18-8.1.14.el5 The Domain0 zone is indeed rock stable, while the Web1 etc. are crashing daily with the 2.6.18-8.1.14 Xen kernel and the stack trace we see after a few hours is as follows: BUG: soft lockup detected on CPU#5! Call Trace: <IRQ> [<ffffffff802a76ad>] softlockup_tick+0xdb/0xed [<ffffffff8026ba66>] timer_interrupt+0x396/0x3f2 [<ffffffff80210a87>] handle_IRQ_event+0x2d/0x60 [<ffffffff802a79ec>] __do_IRQ+0xa4/0x105 [<ffffffff802699b3>] do_IRQ+0xe7/0xf5 [<ffffffff8038dde8>] evtchn_do_upcall+0x86/0xe0 [<ffffffff8025cc1a>] do_hypervisor_callback+0x1e/0x2c <EOI> [<ffffffff802063aa>] hypercall_page+0x3aa/0x1000 [<ffffffff802063aa>] hypercall_page+0x3aa/0x1000 [<ffffffff8026afe2>] raw_safe_halt+0x84/0xa8 [<ffffffff802684f8>] xen_idle+0x38/0x4a [<ffffffff80247bcd>] cpu_idle+0x97/0xba BUG: soft lockup detected on CPU#7! Etc., etc etc, It does not crash the Xen zones directly, but clogs up the Xen web1 console etc. We did not see this when running the 2.6.18-8.1.8 Xen kernel, instead the Xen zones crashed less frequent with a out of memory problem as follows: Call Trace: [<ffffffff802aeefc>] out_of_memory+0x4e/0x1d3 [<ffffffff8020efe8>] __alloc_pages+0x229/0x2b2 [<ffffffff8023fd5b>] __lock_page+0x5e/0x64 [<ffffffff80232637>] read_swap_cache_async+0x42/0xd1 [<ffffffff802b32a2>] swapin_readahead+0x4e/0x77 [<ffffffff8020929d>] __handle_mm_fault+0xae3/0xf46 [<ffffffff80260709>] _spin_lock_irqsave+0x9/0x14 [<ffffffff80262fe8>] do_page_fault+0xe48/0x11dc [<ffffffff80207138>] kmem_cache_free+0x77/0xca [<ffffffff8025cb6f>] error_exit+0x0/0x6e We think the whole problem is how the kernel fails to handle resource cloging (to many interrupts, heavy CPU and memory usage in the defined zones etc.) from stubmbling on some fuzzy posts on the net, example: http://article.gmane.org/gmane.comp.emulators.xen.user/26617 Is this problem known to you or new, any ideas on howto resolve it? Regards, Nicolas Sahlqvist CouchSurfing,.com

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Re: [kvm-devel] [RFC] let kvm be compiled with gcc4 and prevent users to shoot themselves in the foot while doing so (was Re: [ kvm-Bugs-1807620 ] KVM's --disable-gcc-check doesn't work)
by Jim Paris 08 Oct '07

08 Oct '07

Carlo Marcelo Arenas Belon wrote: > And considering also there might be other yet unknown bugs because of gcc4, it > is most likely better to stick to use gcc-3.x, unless there is really no other > option. > > For cases where no compat-gcc package is provided (like in OpenSUSE) then the > following is IMHO the next best approach to force users to get gcc-3.x > compiler installed from source just to be able to compile kvm. This will probably become more of a problem over time. GCC 3 is slated to be removed from the next Debian release: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=440425 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=440430 > PS. please let me know what you think about it and if interested so I can > provide the 3 patches (or more if more changes are needed) in a [PATCH] > series for easy git-am'ing > > + if test $check_gcc = "no" ; then > + if gcc -v 2>&1 | grep -q 'gcc *version *4\.[0-3]\.[0-9]'; then > + echo "#define USE_GCC4 1" >> $config_h > + fi > + fi Something like #if __GNUC__ >= 4 in the code would be simpler. -jim

1 0

Windows 98 with Xen?
by Ken Tang 06 Oct '07

06 Oct '07

Anyone successful at installing Windows 98 on Xen in CentOS5? I get an error about Windows 98 not being able to find a compatible CD drive. I use an .ISO image as the CD.

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Re: [kvm-devel] [ kvm-Bugs-1807620 ] KVM's --disable-gcc-check doesn't work
by Farkas Levente 05 Oct '07

05 Oct '07

Gregory Haskins wrote: > On Thu, 2007-10-04 at 19:27 +0200, Farkas Levente wrote: > >> ok but now as qemu code was imported into kvm, then it's probably would >> be better to witch gcc-4.x? > > Sure. Are you volunteering? ;) I'm sure both upstream QEMU developers, > KVM developers, and the community using either would be most > appreciative. I know I would be. here i mean that packaging kvm for fedora/redhat/centos using gcc-4.x in stead of gcc-3.x. if currently there is no reason to use gcc-3.x than i change all of my spec file. ps. anyway it's planed to be temporary or permanent to use a qemu fork for kvm and not try to propagate changes back to the upstream qemu? -- Levente "Si vis pacem para bellum!"

3 2

VMGL for centos and fedora
by Farkas Levente 29 Sep '07

29 Sep '07

hi, is there any plan to package and/or include VMGL in centos/fedora: http://www.cs.toronto.edu/~andreslc/xen-gl/ -- Levente "Si vis pacem para bellum!"

3 2

kvm in testing
by Farkas Levente 19 Sep '07

19 Sep '07

hi, in testing the kvm version is kvm-kmod-36-2.2.6.18_8.1.1.el5.src.rpm shouldn't it be 36-2.2.6.18_8.1.10 or at least 36-2.2.6.18_8.1.8? it has reason or just a bug? thanks. -- Levente "Si vis pacem para bellum!"

2 1

KVM-36
by Daniel de Kok 16 Sep '07

16 Sep '07

Hi all, KVM-36 is now in testing. Since KVM-37 has added new functionality (pic/lapic/ioapic) that could introduce regressions, this is the release that we will stick to (testing, extra if there are no serious regressions compared to kvm-35) for a while. Take care, Daniel

2 2

open-vm-tools
by Karanbir Singh 13 Sep '07

13 Sep '07

hi, Just wondering if anyone had looked into http://open-vm-tools.sourceforge.net/ announced by vmware recently ? -- Karanbir Singh : http://www.karan.org/ : 2522219@icq

1 0

Xen VMs on GFS
by Lars E. D. Jensen 10 Sep '07

10 Sep '07

Hello list I've installed cluster suite with 8 physical nodes, these are connected to a SAN using CLVM and AOE protocol. The cluster suite runs on the physical nodes/servers, in dom0. If I have to use GFS, where do I install this? What is the right approach to using GFS with Xen. I see 2 options: 1. I install GFS inside each domU (unprivileged domain, the actual VM). 2. I install GFS on CLVM volumes on dom0 and mount these partitions with domUs. Which of these options are possible ? Or maybe I have to ask, how do you do it ? :) Thanks Lars

2 3

rpms for kvm on centos
by Farkas Levente 10 Sep '07

10 Sep '07

hi, for those of you who can't wait for the centos testing rpms i recompile a few packages for centos-5: https://www.lfarkas.org/linux/packages/centos/5/ there's no support for it and the centos repositories are always better then these packages:-) -- Levente "Si vis pacem para bellum!"

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