RHEL6: pNFS / NFS4.1 client kernel crash in memcpy called from xdr_inline_decode filelayout_decode_layout filelayout_alloc_lseg

Issue

• NFS4.1 / pNFS client kernel crash inside memcpy called from xdr_inline_decode filelayout_decode_layout filelayout_alloc_lseg

<1>BUG: unable to handle kernel paging request at 0000000000008050
<1>IP: [<ffffffff81282dab>] memcpy+0xb/0x120
<4>PGD 66a3e9067 PUD 66909d067 PMD 0
<4>Oops: 0000 [#1] SMP
<4>last sysfs file: /sys/module/nfs/initstate
<4>CPU 3
<4>Modules linked in: nfs_layout_nfsv41_files nfs lockd fscache auth_rpcgss nfs_acl sunrpc cpufreq_ondemand acpi_cpufreq freq
_table mperf ipv6 shpchp microcode i2c_i801 sg iTCO_wdt iTCO_vendor_support snd_hda_codec_realtek snd_hda_intel snd_hda_codec
 snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc ioatdma i7core_edac edac_core igb dca ptp pp
s_core ext4 mbcache jbd2 sr_mod cdrom sd_mod crc_t10dif firewire_ohci firewire_core crc_itu_t pata_acpi ata_generic ata_piix 
nouveau ttm drm_kms_helper drm i2c_algo_bit i2c_core mxm_wmi video output wmi dm_mirror dm_region_hash dm_log dm_mod [last un
loaded: scsi_wait_scan]
<4>
<4>Pid: 12815, comm: cat Not tainted 2.6.32-355.el6.x86_64 #1 Intel Corporation S5520SC/S5520SC
<4>RIP: 0010:[<ffffffff81282dab>]  [<ffffffff81282dab>] memcpy+0xb/0x120
<4>RSP: 0018:ffff880667691790  EFLAGS: 00010246
<4>RAX: ffff880669332000 RBX: ffff880667691818 RCX: 000000000df81006
<4>RDX: 0000000000000000 RSI: 0000000000008050 RDI: ffff880669332000
<4>RBP: ffff8806676917b8 R08: 0000000000000000 R09: 0000000000000000
<4>R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000024
<4>R13: ffff880669332000 R14: ffff88036fc08030 R15: ffff8806676918a8
<4>FS:  00007f000172f700(0000) GS:ffff88037ac20000(0000) knlGS:0000000000000000
<4>CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
<4>CR2: 0000000000008050 CR3: 00000005e62fe000 CR4: 00000000000007e0
<4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
<4>Process cat (pid: 12815, threadinfo ffff880667690000, task ffff88058195caa0)
<4>Stack:   
<4> ffffffffa0435991 ffff8806696239c0 ffff880667691818 ffff8806676918a8
<4><d> ffff8806676917d8 ffff880667691888 ffffffffa054941b ffffea00167032f0
<4><d> 000000508116705e 0000000000000000 0000000000000000 0000000000000000
<4>Call Trace:
<4> [<ffffffffa0435991>] ? xdr_inline_decode+0xb1/0x120 [sunrpc]
<4> [<ffffffffa054941b>] filelayout_decode_layout+0xeb/0x350 [nfs_layout_nfsv41_files]
<4> [<ffffffffa054970c>] filelayout_alloc_lseg+0x8c/0x3c0 [nfs_layout_nfsv41_files]
<4> [<ffffffff8150e3be>] ? __wait_on_bit+0x7e/0x90