Description of problem:<br />
Happend during massive loop when starting KVM domains, saving one by one <br />
and resuming one by one. This happend during save of one domain.<br />
<br />
Version-Release number of selected component:<br />
kernel<br />
<br />
Truncated backtrace:<br />
WARNING: at kernel/rcutree.c:2396 __call_rcu+0x239/0x2c0()<br />
Modules linked in: vhost_net macvtap macvlan ip6table_filter ip6_tables ebt_arp ebt_ip ebtable_nat ebtables tun 8021q garp mrp bridge stp llc bonding ipt_REJECT xt_comment xt_multiport xt_conntrack iptable_filter xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables raid0 intel_powerclamp coretemp xprtrdma ib_isert iTCO_wdt iTCO_vendor_support iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi intel_rapl kvm_intel kvm crct10dif_pclmul ib_srpt crc32_pclmul crc32c_intel ghash_clmulni_intel target_core_mod aesni_intel lrw gf128mul glue_helper ablk_helper cryptd pcspkr cdc_ether usbnet mii sb_edac edac_core lpc_ich i2c_i801 mfd_core ioatdma ntb shpchp wmi ib_srp scsi_transport_srp scsi_tgt<br />
ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm nfsd ib_cm iw_cm auth_rpcgss nfs_acl lockd sunrpc ipmi_si ipmi_devintf ipmi_msghandler ext4 mbcache jbd2 raid1 sd_mod crc_t10dif crct10dif_common mlx4_ib ib_sa ib_mad ib_core ib_addr mlx4_en vxlan ip_tunnel mgag200 syscopyarea sysfillrect sysimgblt drm_kms_helper ttm mpt2sas igb drm raid_class mlx4_core ptp scsi_transport_sas pps_core dca i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod<br />
CPU: 7 PID: 810 Comm: kworker/7:2 Not tainted 3.10.0-229.4.2.el7.x86_64 #1<br />
Hardware name: IBM IBM System X iDataPlex dx360 M4 Server -[7912Z16]-/00D4158, BIOS -[TDE142AUS-1.51]- 08/06/2014<br />
Workqueue: cgroup_destroy cgroup_free_fn<br />
0000000000000000 00000000c07f7c24 ffff88183a1c3d40 ffffffff81604eaa<br />
ffff88183a1c3d78 ffffffff8106e34b ffffffff810a2b90 ffff880c3a9251e2<br />
ffff88183b258740 ffff88183b258600 00000000000001c0 ffff88183a1c3d88<br />
Call Trace:<br />
[<ffffffff81604eaa>] dump_stack+0x19/0x1b<br />
[<ffffffff8106e34b>] warn_slowpath_common+0x6b/0xb0<br />
[<ffffffff810a2b90>] ? free_sched_group+0x30/0x30<br />
[<ffffffff8106e49a>] warn_slowpath_null+0x1a/0x20<br />
[<ffffffff81113ad9>] __call_rcu+0x239/0x2c0<br />
[<ffffffff81113b7d>] call_rcu_sched+0x1d/0x20<br />
[<ffffffff810a29d0>] cpu_cgroup_css_free+0x20/0x30<br />
[<ffffffff810e9316>] cgroup_free_fn+0x46/0x120<br />
[<ffffffff8108f1eb>] process_one_work+0x17b/0x470<br />
[<ffffffff8108ffbb>] worker_thread+0x11b/0x400<br />
[<ffffffff8108fea0>] ? rescuer_thread+0x400/0x400<br />
[<ffffffff8109739f>] kthread+0xcf/0xe0<br />
[<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140<br />
[<ffffffff81614d3c>] ret_from_fork+0x7c/0xb0<br />
[<ffffffff810972d0>] ? kthread_create_on_node+0x140/0x140
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