Re: [libvirt-users] Libvirtd freezes

On 04/27/2017 03:11 PM, Michal Privoznik wrote: > On 04/27/2017 02:02 PM, Stefano Ricci wrote: >> Hello everyone >> I come back to ask for a hand to solve a problem that has affected me >> since October 2016 and I have not yet solved using libvirt. >> I thought I would solve it by going to a 4.9.x kernel with qemu >> 2.8.1.1 and with libvirt 3.2.0. >> Compile it all in a stable LFS environment version 7.9 and that all >> checks pass without errors. >> The strange thing is that the libvirtd process starts without errors >> but has arrived at the qemu process launch to understand the system's >> capabilities freezes until the following process is killed >> /usr/bin/qemu-system-x86_64 -S -none-user-config -nodefaults >> -nographic -machine none, accel = kvm: tcg -qmp unix: >> /var/lib/libvirt/qemu/capabilities.monitor.sock,server,nowait-pidfile/var/lib/libvirt/qemu/capabilities.Pidfile >> -daemonize, since that time libvirtd resumes running and can be used >> with virsh. >> Performing qemu independently of libvirt works regularly, creates and >> runs virtual machines smoothly. >> >> Thanks in advance >> Stefano Ricci >> > > > I think I've read this somewhere else, but I don't remember where. > Anyway, my rough guess is that libvirtd is stuck on refreshing the qemu > capabilities. This is done on the daemon startup and until it finishes, > no API can be practically executed. Well, for the driver in question (in > this case qemu). Other driver should work just fine. > > Can you please attach debugger and get the backtrace for us? > > gdb -p $(pgrep libvirtd) > > ... > ... > (gdb) bt I mean more 't a a bt' which stands for 'thread apply all backtrace' => get backtrace for all the threads. Thanks. Michal