Additional info:
reporter:       libreport-2.2.2
BUG: soft lockup - CPU#3 stuck for 22s! [systemd-udevd:25340]
Modules linked in: des_generic md4 nls_utf8 cifs rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd fscache bnep bluetooth fuse xt_CHECKSUM ipt_MASQUERADE ip6t_rpfilter ip6t_REJECT cfg80211 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 s5h1411 eeepc_wmi asus_wmi sparse_keymap rfkill iTCO_wdt iTCO_vendor_support cx25840 cx23885 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel btcx_risc x86_pkg_temp_thermal altera_ci coretemp snd_usb_audio snd_hda_controller snd_hda_codec snd_virtuoso snd_usbmidi_lib snd_oxygen_lib snd_mpu401_uart videobuf_dvb snd_rawmidi snd_hwdep tda18271 kvm_intel altera_stapl snd_seq snd_seq_device snd_pcm kvm tveeprom cx2341x videobuf_dma_sg videobuf_core dvb_core rc_core lpc_ich v4l2_common ums_realtek uas ftdi_sio joydev mei_me crct10dif_pclmul r8169 usblp videodev mei usb_storage mii media i2c_i801 mfd_core crc32_pclmul snd_timer crc32c_intel ghash_clmulni_intel microcode shpchp snd soundcore serio_raw binfmt_misc sunrpc nouveau i2c_algo_bit mxm_wmi drm_kms_helper ttm drm i2c_core video wmi
CPU: 3 PID: 25340 Comm: systemd-udevd Not tainted 3.15.0-0.rc5.git0.1.fc21.x86_64 #1
Hardware name: System manufacturer System Product Name/P8Z77-V LE PLUS, BIOS 0908 12/10/2013
task: ffff8807767bebf0 ti: ffff8806a176e000 task.ti: ffff8806a176e000
RIP: 0010:[<ffffffff81708232>]  [<ffffffff81708232>] _raw_spin_lock+0x12/0x50
RSP: 0018:ffff8806a176fb38  EFLAGS: 00000286
RAX: 00000000bd82bd82 RBX: 0000000074c774c6 RCX: 00000000b167b166
RDX: ffff8800b90e02c0 RSI: ffff8806a176fb80 RDI: ffff8800b90e0298
RBP: ffff8806a176fb38 R08: ffff8800b90e02c0 R09: 0000000180240003
R10: ffff88081ecd8150 R11: ffff8807ef84e0e0 R12: ffff8800b90e02c0
R13: 0000000180240003 R14: ffff88081ecd8150 R15: ffff8807ef84e0e0
FS:  00007f224aa49880(0000) GS:ffff88081ecc0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f224aa7d000 CR3: 0000000777943000 CR4: 00000000001407e0
Stack:
 ffff8806a176fb68 ffffffff81207304 ffff8806a176fb80 ffff8800b90e03c0
 0000000000000013 ffff8806a176fdc0 ffff8806a176fbb8 ffffffff8120767c
 ffff8800b90e03c0 ffff8800b90e0800 ffff8800b90e02c0 ffff880600000013
Call Trace:
 [<ffffffff81207304>] shrink_dentry_list+0x34/0x120
 [<ffffffff8120767c>] check_submounts_and_drop+0x7c/0xb0
 [<ffffffff8126a96d>] kernfs_dop_revalidate+0x5d/0xd0
 [<ffffffff811f9f06>] lookup_fast+0x276/0x2f0
 [<ffffffff812f043c>] ? security_inode_permission+0x1c/0x30
 [<ffffffff811fb057>] link_path_walk+0x1d7/0xec0
 [<ffffffff81205fef>] ? __d_free+0x3f/0x60
 [<ffffffff811fbda7>] path_lookupat+0x67/0xd70
 [<ffffffff811d2225>] ? kmem_cache_alloc+0x35/0x1f0
 [<ffffffff811fa716>] ? getname_flags+0x56/0x1b0
 [<ffffffff811fcada>] filename_lookup+0x2a/0xd0
 [<ffffffff81200f27>] user_path_at_empty+0x67/0xd0
 [<ffffffff811fa692>] ? final_putname+0x22/0x50
 [<ffffffff811fa949>] ? putname+0x29/0x40
 [<ffffffff81200f32>] ? user_path_at_empty+0x72/0xd0
 [<ffffffff81200fa1>] user_path_at+0x11/0x20
 [<ffffffff811f3efa>] vfs_fstatat+0x6a/0xd0
 [<ffffffff811f448e>] SYSC_newstat+0x2e/0x60
 [<ffffffff81122ed6>] ? __audit_syscall_exit+0x1f6/0x2a0
 [<ffffffff811f475e>] SyS_newstat+0xe/0x10
 [<ffffffff817119e9>] system_call_fastpath+0x16/0x1b
Code: d0 f0 0f b1 0f 39 d0 75 e5 b8 01 00 00 00 5d c3 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 b8 00 00 01 00 f0 0f c1 07 <89> c2 c1 ea 10 66 39 c2 89 d1 75 02 5d c3 b8 00 80 00 00 eb 10