Description of problem:

[1043846.943576] BUG: soft lockup - CPU#1 stuck for 23s! [rsync:17305]
[1043846.943582] Modules linked in: usb_storage xfs libcrc32c dm_crypt 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 snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm coretemp snd_page_alloc r8169 snd_timer joydev iTCO_wdt gpio_ich iTCO_vendor_support snd mii shpchp ppdev lpc_ich raid1 microcode soundcore i2c_i801 mfd_core serio_raw parport_pc parport acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd sunrpc i915 ata_generic video
[1043846.943651]  pata_acpi i2c_algo_bit drm_kms_helper drm i2c_core
[1043846.943659] CPU: 1 PID: 17305 Comm: rsync Tainted: G        W    3.13.6-200.fc20.x86_64 #1
[1043846.943662] Hardware name: Gigabyte Technology Co., Ltd. G31M-S2L/G31M-S2L, BIOS F4 01/02/2008
[1043846.943666] task: ffff880000199140 ti: ffff88001eed6000 task.ti: ffff88001eed6000
[1043846.943668] RIP: 0010:[<ffffffff811cdf10>]  [<ffffffff811cdf10>] d_shrink_del+0x0/0x80
[1043846.943676] RSP: 0018:ffff88001eed7868  EFLAGS: 00000246
[1043846.943679] RAX: ffff880004493e00 RBX: 0000000000000000 RCX: dead000000200200
[1043846.943681] RDX: 000000000000346d RSI: 0000000000000000 RDI: ffff880004493d80
[1043846.943684] RBP: ffff88001eed7898 R08: ffff880004493e00 R09: 00000000000006c4
[1043846.943687] R10: 0000000000000000 R11: ffff88001eed752e R12: 0000000000000000
[1043846.943689] R13: ffff88001eed7860 R14: 8149431e54e08530 R15: ffff88001eed7860
[1043846.943692] FS:  00007f501f24e740(0000) GS:ffff88007f280000(0000) knlGS:0000000000000000
[1043846.943695] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[1043846.943698] CR2: 00007fbbdb453000 CR3: 00000000486a2000 CR4: 00000000000007e0
[1043846.943700] Stack:
[1043846.943702]  ffffffff811cf258 ffff880004493e00 ffff88001eed78b0 00000000000000f8
[1043846.943707]  ffff88003373b800 0000000000000000 ffff88001eed78d0 ffffffff811d08f7
[1043846.943711]  0000000000000000 ffff880073c30500 ffff880004493e00 ffff88001eed7aa0
[1043846.943715] Call Trace:
[1043846.943721]  [<ffffffff811cf258>] ? shrink_dentry_list+0x68/0xd0
[1043846.943726]  [<ffffffff811d08f7>] prune_dcache_sb+0x47/0x60
[1043846.943730]  [<ffffffff811bc1e7>] super_cache_scan+0xe7/0x160
[1043846.943735]  [<ffffffff8115c1df>] shrink_slab+0x1cf/0x380
[1043846.943740]  [<ffffffff8115f3e1>] do_try_to_free_pages+0x491/0x670
[1043846.943744]  [<ffffffff8115f6af>] try_to_free_pages+0xef/0x170
[1043846.943749]  [<ffffffff81153d7c>] __alloc_pages_nodemask+0x70c/0xa80
[1043846.943756]  [<ffffffff815745e1>] ? __kmalloc_reserve.isra.25+0x31/0x90
[1043846.943761]  [<ffffffff811929e3>] alloc_pages_current+0xa3/0x170
[1043846.943765]  [<ffffffff815700bc>] sock_alloc_send_pskb+0x21c/0x3d0
[1043846.943771]  [<ffffffff810ae7d0>] ? __wake_up_sync_key+0x50/0x60
[1043846.943776]  [<ffffffff81627c0e>] unix_stream_sendmsg+0x26e/0x400
[1043846.943781]  [<ffffffff8156ad7e>] sock_aio_write+0xfe/0x130
[1043846.943786]  [<ffffffff811b83da>] do_sync_write+0x5a/0x90
[1043846.943791]  [<ffffffff811b8c2d>] vfs_write+0x1ad/0x1f0
[1043846.943794]  [<ffffffff811b8a0e>] ? vfs_read+0xee/0x160
[1043846.943798]  [<ffffffff811b9569>] SyS_write+0x49/0xa0
[1043846.943803]  [<ffffffff810fc2a6>] ? __audit_syscall_exit+0x1f6/0x2a0
[1043846.943809]  [<ffffffff816962e9>] system_call_fastpath+0x16/0x1b
[1043846.943811] Code: 83 80 3d 72 1a b1 00 00 75 82 be 3e 06 00 00 48 c7 c7 87 02 a2 81 e8 40 f6 e9 ff c6 05 58 1a b1 00 01 e9 65 ff ff ff 0f 1f 40 00 <66> 66 66 66 90 55 48 89 e5 41 54 53 8b 07 48 89 fb 25 00 04 08 

Version-Release number of selected component (if applicable):
Fedora 20, 3.13.6-200.fc20.x86_64
rsync-3.1.0-2.fc20.x86_64
glibc-2.18-12.fc20.x86_64

Steps to Reproduce:

2xSATA in RAID1 and USB drive
rsync -aPv /raid1/luks/partition /usb-drive/luks/partition/

luksDump (both the same):
Version:        1
Cipher name:    aes
Cipher mode:    xts-plain64
Hash spec:      sha512
Payload offset: 4096
MK bits:        512

1. create raid1 with mdadm, crypt it with luks, mount
2. crypt USB drive, mount
3. rsync a lot of files (kmail directory)

How reproducible:
for now: several times

Actual results:
copying is stopped.

Expected results:
copy of files

Additional info: