kernel/nfsd lockup

[Gary Artim]

anyone have system crashes on NFS using current kernel? 2 nites in a
row I've crashed, backed out the last 2 kernels.

May  7 01:32:26 r1epi kernel: BUG: soft lockup - CPU#2 stuck for 22s! [nfsd:674]
May  7 01:32:26 r1epi kernel: Modules linked in: binfmt_misc sch_sfq
xt_iprange bonding ip6t_REJECT nf_conntrack_ipv6 nf_conntrack_ipv4
nf_defrag_ipv6 nf_defrag_ipv4 xt_conntrack nf_conntrack
ip6table_filter ip6_tables snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic iTCO_wdt iTCO_vendor_support btrfs
x86_pkg_temp_thermal coretemp eeepc_wmi asus_wmi sparse_keymap mxm_wmi
kvm crct10dif_pclmul crc32_pclmul crc32c_intel raid6_pq
ghash_clmulni_intel btusb bluetooth microcode xor serio_raw
6lowpan_iphc i2c_i801 rfkill e1000 lpc_ich mfd_core snd_hda_intel
snd_hda_codec snd_hwdep snd_pcm e1000e snd_timer snd mei_me ptp
soundcore mei pps_core shpchp wmi nfsd auth_rpcgss nfs_acl lockd
sunrpc i915 firewire_ohci firewire_core i2c_algo_bit crc_itu_t
drm_kms_helper drm video aacraid i2c_core
May  7 01:32:26 r1epi kernel: CPU: 2 PID: 674 Comm: nfsd Not tainted
3.14.2-200.fc20.x86_64 #1
May  7 01:32:26 r1epi kernel: Hardware name: System manufacturer
System Product Name/P8Z68-V PRO, BIOS 0902 09/19/2011
May  7 01:32:26 r1epi kernel: task: ffff880409dfc280 ti:
ffff88040933e000 task.ti: ffff88040933e000
May  7 01:32:26 r1epi kernel: RIP: 0010:[<ffffffff81202607>]
[<ffffffff81202607>] d_obtain_alias+0x1b7/0x1d0
May  7 01:32:26 r1epi kernel: RSP: 0018:ffff88040933fb00  EFLAGS: 00000202
May  7 01:32:26 r1epi kernel: RAX: ffff8804159b5800 RBX:
ffffffff812039a3 RCX: ffff8802a014ff09
May  7 01:32:26 r1epi kernel: RDX: ffff8804159b58b0 RSI:
ffffffffa06a1140 RDI: ffff88011500a298
May  7 01:32:26 r1epi kernel: RBP: ffff88040933fb18 R08:
0000000000017bf0 R09: ffffffff812021b5
May  7 01:32:26 r1epi kernel: R10: ff70d95e69a37803 R11:
ffffea001059dc00 R12: 0000000000000000
May  7 01:32:26 r1epi kernel: R13: ffff88007126bd40 R14:
ffffffff810d1cb5 R15: ffff88040933fa78
May  7 01:32:26 r1epi kernel: FS:  0000000000000000(0000)
GS:ffff88042fa80000(0000) knlGS:0000000000000000
May  7 01:32:26 r1epi kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May  7 01:32:26 r1epi kernel: CR2: 00007fce32b47cc0 CR3:
0000000001c0c000 CR4: 00000000000407e0
May  7 01:32:26 r1epi kernel: Stack:
May  7 01:32:26 r1epi kernel: ffff88007126bd40 ffffffffffffff8c
000000000004027d ffff88040933fb88
May  7 01:32:26 r1epi kernel: ffffffffa0661375 00000000008fb47b
ffff880417fcc000 0000000009dfc280
May  7 01:32:26 r1epi kernel: 7bff880409dfc790 0100000000008fb4
0000000000000000 00000000f09fdf25
May  7 01:32:26 r1epi kernel: Call Trace:
May  7 01:32:26 r1epi kernel: [<ffffffffa0661375>]
btrfs_get_dentry+0x115/0x140 [btrfs]
May  7 01:32:26 r1epi kernel: [<ffffffffa01eaa40>] ?
nfsd_proc_getattr+0xa0/0xa0 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa0661662>]
btrfs_fh_to_dentry+0x32/0x60 [btrfs]
May  7 01:32:26 r1epi kernel: [<ffffffff812cc842>] exportfs_decode_fh+0x72/0x2e0
May  7 01:32:26 r1epi kernel: [<ffffffffa01f0a2b>] ? exp_find+0x10b/0x1c0 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffff810c2885>] ? sched_clock_cpu+0x85/0xc0
May  7 01:32:26 r1epi kernel: [<ffffffff811cc925>] ? kmem_cache_alloc+0x35/0x1f0
May  7 01:32:26 r1epi kernel: [<ffffffff810b3606>] ? prepare_creds+0x26/0x1c0
May  7 01:32:26 r1epi kernel: [<ffffffffa01eb796>] fh_verify+0x316/0x600 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa01bd10e>] ?
cache_check+0x2be/0x380 [sunrpc]
May  7 01:32:26 r1epi kernel: [<ffffffffa01f9ac9>] nfsd4_putfh+0x49/0x50 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa01fbd1a>]
nfsd4_proc_compound+0x56a/0x7b0 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa01e7dbb>]
nfsd_dispatch+0xbb/0x200 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa01b2d00>]
svc_process_common+0x480/0x6f0 [sunrpc]
May  7 01:32:26 r1epi kernel: [<ffffffffa01b3077>]
svc_process+0x107/0x170 [sunrpc]
May  7 01:32:26 r1epi kernel: [<ffffffffa01e774f>] nfsd+0xbf/0x130 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffffa01e7690>] ?
nfsd_destroy+0x80/0x80 [nfsd]
May  7 01:32:26 r1epi kernel: [<ffffffff810ae211>] kthread+0xe1/0x100
May  7 01:32:26 r1epi kernel: [<ffffffffa03509e8>] ?
bond_remove_proc_entry+0x58/0x80 [bonding]
May  7 01:32:26 r1epi kernel: [<ffffffff810ae130>] ?
insert_kthread_work+0x40/0x40
May  7 01:32:26 r1epi kernel: [<ffffffff816fef7c>] ret_from_fork+0x7c/0xb0
May  7 01:32:26 r1epi kernel: [<ffffffff810ae130>] ?
insert_kthread_work+0x40/0x40
May  7 01:32:26 r1epi kernel: Code: 00 66 41 83 45 58 01 66 83 83 88
00 00 00 01 48 89 de 4c 89 ef e8 ca 81 0e 00 4c 89 e8 e9 a1 fe ff ff
f3 90 48 8b 88 b0 00 00 00 <80> e1 01 75 f2 e9 75 ff ff ff 48 89 f8 e9
86 fe ff ff 0f 0b 0f