Public bug reported: I have two stuck kvm guests hanging in state R (for several hours now) on two different hosts. Actually they are not consuming any CPU and cannot be killed with kill -9. They are not responding to anything. Both systems are Ubuntu 12.10 Quantal running on a AMD II X4 965 Processor with 16GB RAM.
Stack trace of the first stuck guest: cat /proc/2647/stack [<ffffffff81683e06>] retint_careful+0x14/0x32 [<ffffffffffffffff>] 0xffffffffffffffff Stack trace of the second stuck guest: cat /proc/11932/stack [<ffffffff81084d2a>] __cond_resched+0x2a/0x40 [<ffffffff811544aa>] try_to_unmap_file+0x3a/0x6d0 [<ffffffff811553c1>] try_to_unmap+0x31/0x70 [<ffffffff811722a8>] migrate_pages+0x318/0x500 [<ffffffff811453b4>] compact_zone+0x1e4/0x350 [<ffffffff811458bf>] try_to_compact_pages+0x16f/0x1d0 [<ffffffff81677a94>] __alloc_pages_direct_compact+0xaa/0x191 [<ffffffff8112bee3>] __alloc_pages_nodemask+0x473/0x920 [<ffffffff81164b30>] alloc_pages_current+0xb0/0x120 [<ffffffff8116bf5d>] new_slab+0x22d/0x2c0 [<ffffffff816790ea>] __slab_alloc+0x314/0x46e [<ffffffff811708a1>] __kmalloc_node_track_caller+0xa1/0x1b0 [<ffffffff81566e99>] __alloc_skb+0x79/0x230 [<ffffffff81560a31>] sock_alloc_send_pskb+0x1d1/0x320 [<ffffffff81499ec1>] tun_get_user+0x131/0x4a0 [<ffffffff8149a759>] tun_chr_aio_write+0x69/0x90 [<ffffffff8118297a>] do_sync_readv_writev+0xda/0x120 [<ffffffff81182c64>] do_readv_writev+0xd4/0x1e0 [<ffffffff81182da5>] vfs_writev+0x35/0x60 [<ffffffff81182f2a>] sys_writev+0x4a/0xb0 [<ffffffff8168bb69>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff Packages: Kernel: 3.5.0-23-generic #35-Ubuntu SMP Thu Jan 24 13:15:40 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux KVM: 1.2.0+noroms-0ubuntu2.12.10.2 Command line: kvm -name vm-16762 -machine pc-1.2 -enable-kvm -cpu kvm64 -smp sockets=1,cores=2 -m 1024 -vga cirrus -drive id=drive1245,if=none,cache=writeback,aio=native,format=raw,media=disk,file=rbd:kvm1/vm-16762-disk-1 -device virtio-blk-pci,id=hdrive1245,addr=0x12,drive=drive1245 -netdev tap,id=netdev1243,ifname=tap1243,script=,downscript= -device virtio-net-pci,id=nic1243,addr=0x03,mac=02:48:6e:2b:4e:55,netdev=netdev1243 -chardev socket,id=qmp,path=/var/run/kvm/vm-16762/qmp,server,nowait -mon chardev=qmp,mode=control -monitor unix:/var/run/kvm/vm-16762/mon,server,nowait -vnc 10.0.0.60:21,password -usbdevice tablet -nodefaults -pidfile /var/run/kvm/vm-16762/pid -boot menu=on -k de -chroot /var/run/kvm/vm-16762 -runas kvm -daemonize Original bug report is here: https://bugzilla.kernel.org/show_bug.cgi?id=54071 ** Affects: qemu-kvm (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu-kvm in Ubuntu. https://bugs.launchpad.net/bugs/1130007 Title: kvm guests stuck (not in io) and cannot be killed using -9 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1130007/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
