Additional info:
reporter:       libreport-2.2.2
BUG: soft lockup - CPU#0 stuck for 22s! [systemd-udevd:2054]
Modules linked in: fuse cfg80211 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 raid1 eeepc_wmi asus_wmi sparse_keymap rfkill snd_hda_codec_realtek snd_hda_codec_generic kvm_amd joydev uas kvm snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm microcode serio_raw k10temp fam15h_power edac_core snd_timer edac_mce_amd tpm_infineon snd tpm_tis sp5100_tco tpm soundcore i2c_piix4 shpchp acpi_cpufreq isofs usb_storage squashfs nouveau video i2c_algo_bit mxm_wmi drm_kms_helper crct10dif_pclmul crc32_pclmul crc32c_intel ttm ghash_clmulni_intel drm r8169 i2c_core mii wmi loop
CPU: 0 PID: 2054 Comm: systemd-udevd Not tainted 3.15.0-0.rc7.git0.1.fc21.x86_64 #1
Hardware name: To be filled by O.E.M. To be filled by O.E.M./M5A99X EVO R2.0, BIOS 2501 04/03/2014
task: ffff88022f8309e0 ti: ffff88020e192000 task.ti: ffff88020e192000
RIP: 0010:[<ffffffff81707d59>]  [<ffffffff81707d59>] _raw_spin_lock+0x9/0x50
RSP: 0018:ffff88020e193bb0  EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000005b005b
RDX: 00000001005b005b RSI: 00000000005b005b RDI: ffff88022e5f04d8
RBP: ffff88020e193bb0 R08: 0000000000000000 R09: fdaf4d10bcd2fc03
R10: ffff88023ec18150 R11: ffff88003e52c700 R12: ffff88023ec18150
R13: ffff88003e52c700 R14: ffffffff8182d480 R15: ffff88020e193b98
FS:  00007f203b316880(0000) GS:ffff88023ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f203b326000 CR3: 000000023190b000 CR4: 00000000000407f0
Stack:
 ffff88020e193bc8 ffffffff81368770 ffff88022e6e8f80 ffff88020e193bf8
 ffffffff81206f6a ffff88020e193c10 ffff880232b9b900 0000000000000048
 ffff88020e193e50 ffff88020e193c48 ffffffff8120727c ffff880232b9b900
Call Trace:
 [<ffffffff81368770>] lockref_put_or_lock+0x50/0x90
 [<ffffffff81206f6a>] shrink_dentry_list+0x9a/0x120
 [<ffffffff8120727c>] check_submounts_and_drop+0x7c/0xb0
 [<ffffffff8126a4ed>] kernfs_dop_revalidate+0x5d/0xd0
 [<ffffffff811f9b16>] lookup_fast+0x276/0x2f0
 [<ffffffff812efeec>] ? security_inode_permission+0x1c/0x30
 [<ffffffff811fac67>] link_path_walk+0x1d7/0xec0
 [<ffffffff81180fc6>] ? free_hot_cold_page_list+0x46/0xa0
 [<ffffffff81185db0>] ? release_pages+0xd0/0x2b0
 [<ffffffff811fb9b7>] path_lookupat+0x67/0xd70
 [<ffffffff811b8829>] ? free_pages_and_swap_cache+0xb9/0xe0
 [<ffffffff811d1f35>] ? kmem_cache_alloc+0x35/0x1f0
 [<ffffffff811fa326>] ? getname_flags+0x56/0x1b0
 [<ffffffff811fc6ea>] filename_lookup+0x2a/0xd0
 [<ffffffff81200b37>] user_path_at_empty+0x67/0xd0
 [<ffffffff811ac387>] ? do_munmap+0x267/0x440
 [<ffffffff811f451b>] SyS_readlink+0x5b/0x130
 [<ffffffff817114e9>] system_call_fastpath+0x16/0x1b
Code: 00 00 8d 8a 00 00 01 00 89 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 66 66 66 66 90 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 
[sched_delayed] sched: RT throttling activated
[sched_delayed] sched: RT throttling activated