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The function doesn't check whether the request is made for active or inactive domain. Thus when the domain is not running it still tries accessing non-existing cgroups (priv->cgroup, which is NULL). I re-made the function in order for it to work the same way it's qemu counterpart does. Reproducer: 1) Define an LXC domain 2) Do 'virsh memtune <domain>' Backtrace: Thread 6 (Thread 0x7fffec8c0700 (LWP 13387)): #0 0x00007ffff70edcc4 in virCgroupPathOfController (group=0x0, controller=3, key=0x7ffff75734bd "memory.limit_in_bytes", path=0x7fffec8bf750) at util/vircgroup.c:1764 #1 0x00007ffff70e958c in virCgroupGetValueStr (group=0x0, controller=3, key=0x7ffff75734bd "memory.limit_in_bytes", value=0x7fffec8bf7c0) at util/vircgroup.c:705 #2 0x00007ffff70e9d29 in virCgroupGetValueU64 (group=0x0, controller=3, key=0x7ffff75734bd "memory.limit_in_bytes", value=0x7fffec8bf810) at util/vircgroup.c:804 #3 0x00007ffff70ee706 in virCgroupGetMemoryHardLimit (group=0x0, kb=0x7fffec8bf8a8) at util/vircgroup.c:1962 #4 0x00005555557d590f in lxcDomainGetMemoryParameters (dom=0x7fffd40024a0, params=0x7fffd40027a0, nparams=0x7fffec8bfa24, flags=0) at lxc/lxc_driver.c:826 #5 0x00007ffff72c28d3 in virDomainGetMemoryParameters (domain=0x7fffd40024a0, params=0x7fffd40027a0, nparams=0x7fffec8bfa24, flags=0) at libvirt.c:4137 #6 0x000055555563714d in remoteDispatchDomainGetMemoryParameters (server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0, rerr=0x7fffec8bfb70, args=0x7fffd40024e0, ret=0x7fffd4002420) at remote.c:1895 #7 0x00005555556052c4 in remoteDispatchDomainGetMemoryParametersHelper (server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0, rerr=0x7fffec8bfb70, args=0x7fffd40024e0, ret=0x7fffd4002420) at remote_dispatch.h:4050 #8 0x00007ffff73b293f in virNetServerProgramDispatchCall (prog=0x555555ec3ae0, server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0) at rpc/virnetserverprogram.c:435 #9 0x00007ffff73b207f in virNetServerProgramDispatch (prog=0x555555ec3ae0, server=0x555555eb7e00, client=0x555555ebaef0, msg=0x555555ebb3e0) at rpc/virnetserverprogram.c:305 #10 0x00007ffff73a4d2c in virNetServerProcessMsg (srv=0x555555eb7e00, client=0x555555ebaef0, prog=0x555555ec3ae0, msg=0x555555ebb3e0) at rpc/virnetserver.c:165 #11 0x00007ffff73a4e8d in virNetServerHandleJob (jobOpaque=0x555555ebc7e0, opaque=0x555555eb7e00) at rpc/virnetserver.c:186 #12 0x00007ffff7187f3f in virThreadPoolWorker (opaque=0x555555eb7ac0) at util/virthreadpool.c:144 #13 0x00007ffff718733a in virThreadHelper (data=0x555555eb7890) at util/virthreadpthread.c:161 #14 0x00007ffff468ed89 in start_thread (arg=0x7fffec8c0700) at pthread_create.c:308 #15 0x00007ffff3da26bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113 Signed-off-by: Martin Kletzander <mkletzan@redhat.com> (cherry picked from commit f8c1cb90213508c4f32549023b0572ed774e48aa)
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>