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I've encountered the following bug, but only on Gentoo with
systemd and CGroupsV2. I've started an LXC container successfully
but destroying it reported the following error:
error: Failed to destroy domain 'amd64'
error: internal error: failed to get cgroup backend for 'pathOfController'
Debugging showed, that CGroup hierarchy is full of surprises:
/sys/fs/cgroup/machine.slice/machine-lxc\x2d861\x2damd64.scope/
└── libvirt
├── dev-hugepages.mount
├── dev-mqueue.mount
├── init.scope
├── sys-fs-fuse-connections.mount
├── sys-kernel-config.mount
├── sys-kernel-debug.mount
├── sys-kernel-tracing.mount
├── system.slice
│ ├── console-getty.service
│ ├── dbus.service
│ ├── system-getty.slice
│ ├── system-modprobe.slice
│ ├── systemd-journald.service
│ ├── systemd-logind.service
│ └── tmp.mount
└── user.slice
For comparison, here's the same container on recent Rawhide:
/sys/fs/cgroup/machine.slice/machine-lxc\x2d13550\x2damd64.scope/
└── libvirt
Anyway, those nested directories should not be a problem, because
virCgroupKillRecursiveInternal() removes them recursively, right?
Sort of. The function really does remove nested directories, but
it assumes that every directory has the same controller as the
rest. Just take a look at virCgroupV2KillRecursive() - it gets
'Any' controller (the first one it found in ".scope") and then
passes it to virCgroupKillRecursiveInternal().
This assumption is not true though. The controllers found in
".scope" are the following:
cpuset cpu io memory pids
while "libvirt" has fewer:
cpuset cpu io memory
Up until now it's not problem, because of how we order
controllers internally - "cpu" is the first and thus picking
"Any" controller returns just that. But the rest of directories
has no controllers, their "cgroup.controllers" is just empty.
What fixes the bug is dropping @controller argument from
virCgroupKillRecursiveInternal() and letting each iteration work
pick its own controller.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
140 lines
4.4 KiB
C
140 lines
4.4 KiB
C
/*
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* vircgrouppriv.h: methods for managing control cgroups
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*
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* Copyright (C) 2011-2013 Red Hat, Inc.
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* Copyright IBM Corp. 2008
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef LIBVIRT_VIRCGROUPPRIV_H_ALLOW
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# error "vircgrouppriv.h may only be included by vircgroup.c or its test suite"
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#endif /* LIBVIRT_VIRCGROUPPRIV_H_ALLOW */
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#pragma once
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#include "vircgroup.h"
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#include "vircgroupbackend.h"
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struct _virCgroupV1Controller {
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int type;
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char *mountPoint;
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/* If mountPoint holds several controllers co-mounted,
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* then linkPoint is path of the symlink to the mountPoint
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* for just the one controller
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*/
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char *linkPoint;
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char *placement;
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};
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typedef struct _virCgroupV1Controller virCgroupV1Controller;
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struct _virCgroupV2Devices {
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int mapfd;
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int progfd;
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ssize_t count;
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ssize_t max;
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};
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typedef struct _virCgroupV2Devices virCgroupV2Devices;
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struct _virCgroupV2Controller {
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int controllers;
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char *mountPoint;
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char *placement;
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virCgroupV2Devices devices;
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};
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typedef struct _virCgroupV2Controller virCgroupV2Controller;
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struct _virCgroup {
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virCgroupBackend *backends[VIR_CGROUP_BACKEND_TYPE_LAST];
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virCgroupV1Controller legacy[VIR_CGROUP_CONTROLLER_LAST];
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virCgroupV2Controller unified;
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char *unitName;
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virCgroup *nested;
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};
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#define virCgroupGetNested(cgroup) \
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(cgroup->nested ? cgroup->nested : cgroup)
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int virCgroupSetValueDBus(const char *unitName,
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const char *key,
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GVariant *value);
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int virCgroupSetValueRaw(const char *path,
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const char *value);
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int virCgroupGetValueRaw(const char *path,
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char **value);
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int virCgroupSetValueStr(virCgroup *group,
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int controller,
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const char *key,
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const char *value);
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int virCgroupGetValueStr(virCgroup *group,
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int controller,
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const char *key,
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char **value);
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int virCgroupSetValueU64(virCgroup *group,
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int controller,
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const char *key,
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unsigned long long int value);
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int virCgroupGetValueU64(virCgroup *group,
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int controller,
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const char *key,
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unsigned long long int *value);
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int virCgroupSetValueI64(virCgroup *group,
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int controller,
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const char *key,
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long long int value);
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int virCgroupGetValueI64(virCgroup *group,
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int controller,
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const char *key,
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long long int *value);
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int virCgroupPartitionEscape(char **path);
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char *virCgroupGetBlockDevString(const char *path);
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int virCgroupGetValueForBlkDev(const char *str,
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const char *devPath,
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char **value);
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int virCgroupNewPartition(const char *path,
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bool create,
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int controllers,
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virCgroup **group)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(4);
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int virCgroupNewDomainPartition(virCgroup *partition,
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const char *driver,
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const char *name,
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virCgroup **group)
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ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(4);
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int virCgroupRemoveRecursively(char *grppath);
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int virCgroupKillRecursiveInternal(virCgroup *group,
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int signum,
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GHashTable *pids,
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const char *taskFile,
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bool dormdir);
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