On 2012-02-18 09:50, Thomas Fjellstrom wrote: > On Sat Feb 18, 2012, Jan Kiszka wrote: >> On 2012-02-18 05:49, Thomas Fjellstrom wrote: >>> I just updated my kvm host, kernel upgraded from 2.6.38 up to 3.2, and >>> qemu+qemu-kvm updated (not sure from what to what). But after the >>> upgrade, one of my guests will not start up. It gets stuck with 60-80% >>> cpu use, almost no memory is allocated by qemu/kvm, and no output of any >>> kind is seen (in the host console, or a bunch of the guest output >>> options like curses display, stdio output, virsh console, vnc or sdl >>> output). I normally use libvirt to manage the guests, but I've attempted >>> to run qemu manually, and have the same problems. >>> >>> What can cause this? >>> >>> Just tested booting back into the old kernel, the one guest still won't >>> start, while the rest do. I'm thoroughly confused. >> >> You mean if you only update qemu-kvm, the problem persists, just with >> lower probability? In that case, we definitely need the version of your >> current qemu-kvm installation. Also, it would be nice to attach gdb to >> the stuck qemu-kvm process, issuing a "thread apply all backtrace" in >> that state. >> >> Jan > > Sorry I wasn't clear. If I just update qemu-kvm (And qemu with it, and not the > kernel), it always just hangs on load. > > current version: > QEMU emulator version 1.0 (qemu-kvm-1.0 Debian 1.0+dfsg-8), Copyright (c) > 2003-2008 Fabrice Bellard > > gdb thread apply all bt: > Thread 2 (Thread 0x7fe7b810c700 (LWP 14650)): > #0 0x00007fe7c0a11957 in ioctl () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x00007fe7c53155e9 in kvm_vcpu_ioctl (env=<optimized out>, type=<optimized > out>) at /build/buildd-qemu-kvm_1.0+dfsg-8-amd64-ppNMqm/qemu-kvm-1.0+dfsg/kvm- > all.c:1101 > #2 0x00007fe7c5315731 in kvm_cpu_exec (env=0x7fe7c61cb350) at /build/buildd- > qemu-kvm_1.0+dfsg-8-amd64-ppNMqm/qemu-kvm-1.0+dfsg/kvm-all.c:987 > #3 0x00007fe7c52ecf31 in qemu_kvm_cpu_thread_fn (arg=0x7fe7c61cb350) at > /build/buildd-qemu-kvm_1.0+dfsg-8-amd64-ppNMqm/qemu-kvm-1.0+dfsg/cpus.c:740 > #4 0x00007fe7c0ccdb50 in start_thread () from /lib/x86_64-linux- > gnu/libpthread.so.0 > #5 0x00007fe7c0a1890d in clone () from /lib/x86_64-linux-gnu/libc.so.6 > #6 0x0000000000000000 in ?? () > > Thread 1 (Thread 0x7fe7c5101900 (LWP 14648)): > #0 0x00007fe7c0a12403 in select () from /lib/x86_64-linux-gnu/libc.so.6 > #1 0x00007fe7c525b56c in main_loop_wait (nonblocking=<optimized out>) at > /build/buildd-qemu-kvm_1.0+dfsg-8-amd64-ppNMqm/qemu-kvm-1.0+dfsg/main- > loop.c:456 > #2 0x00007fe7c51a372f in main_loop () at /build/buildd-qemu-kvm_1.0+dfsg-8- > amd64-ppNMqm/qemu-kvm-1.0+dfsg/vl.c:1482 > #3 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at > /build/buildd-qemu-kvm_1.0+dfsg-8-amd64-ppNMqm/qemu-kvm-1.0+dfsg/vl.c:3523 > > Thanks :) > OK, then we need a kernel view on this. Can you try http://www.linux-kvm.org/page/Tracing ? Thanks, Jan
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