Additional info:
reporter:       libreport-2.1.11.6.g4fe6
BUG: soft lockup - CPU#3 stuck for 22s! [qemu-system-x86:2563]
Modules linked in: tun ipt_MASQUERADE xt_CHECKSUM bnep bluetooth cfg80211 rfkill ip6t_rpfilter ip6t_REJECT xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw x86_pkg_temp_thermal coretemp kvm_intel kvm crc32_pclmul crc32c_intel snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm iTCO_wdt iTCO_vendor_support ppdev 8139too microcode 8139cp i2c_i801 snd_page_alloc lpc_ich serio_raw mii mfd_core snd_timer pcspkr snd soundcore parport_pc parport video nfsd auth_rpcgss nfs_acl lockd sunrpc binfmt_misc radeon i2c_algo_bit drm_kms_helper ttm ata_generic drm pata_acpi i2c_core
CPU: 3 PID: 2563 Comm: qemu-system-x86 Not tainted 3.13.0-0.rc8.git1.1.vanilla.mainline.knurd.1.fc20.i686+PAE #1
Hardware name: Gigabyte Technology Co., Ltd. To be filled by O.E.M./P75-D3, BIOS F4 05/21/2012
task: ee711200 ti: ed91e000 task.ti: ed91e000
EIP: 0060:[<c04a561b>] EFLAGS: 00000286 CPU: 3
EIP is at __srcu_read_unlock+0xb/0x20
EAX: ec6b2024 EBX: ed468000 ECX: 0000401c EDX: 00000000
ESI: 00000000 EDI: 00000000 EBP: ed91fe10 ESP: ed91fe10
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0: 80050033 CR2: 91fb81a0 CR3: 2e7f5000 CR4: 000427f0
Stack:
 ed91feb0 fb8c103b 00000000 00000000 0033c328 00000000 ed91fe3c ee711200
 ee711200 00000286 edb16c00 8e1798bb 00000112 05f40c83 0000010f f7590300
 00b16c00 ec6b2024 7ffbfeff fffffffe c047e701 edb16c00 00000246 ed91fe94
Call Trace:
 [<fb8c103b>] kvm_arch_vcpu_ioctl_run+0x22b/0x10c0 [kvm]
 [<c047e701>] ? ttwu_do_activate.constprop.90+0x51/0x60
 [<c0480226>] ? try_to_wake_up+0x136/0x210
 [<fb8bdd3f>] ? kvm_arch_vcpu_load+0x4f/0x1f0 [kvm]
 [<fb8adca4>] ? vcpu_load+0x44/0x70 [kvm]
 [<fb8ae116>] kvm_vcpu_ioctl+0x416/0x4c0 [kvm]
 [<c04b64e4>] ? do_futex+0xf4/0xa90
 [<c059655b>] ? block_ioctl+0x3b/0x50
 [<fb8add00>] ? vcpu_put+0x30/0x30 [kvm]
 [<c05760a2>] do_vfs_ioctl+0x2e2/0x4c0
 [<c064081f>] ? file_has_perm+0x7f/0x90
 [<c064120c>] ? selinux_file_ioctl+0x4c/0xf0
 [<c05762e0>] SyS_ioctl+0x60/0x80
 [<c09ccccd>] sysenter_do_call+0x12/0x28
Code: 04 64 03 05 c4 90 d7 c0 01 d8 8b 48 08 83 c1 01 89 48 08 5b 89 d0 5e 5d c3 8d b4 26 00 00 00 00 55 89 e5 66 66 66 66 90 0f ae f0 <66> 90 8b 40 04 64 ff 0c 90 5d c3 8d 76 00 8d bc 27 00 00 00 00