Issue

• NFS client kernel panics while removing / unlinking a file due to BUG related to the NFS page counter in the nfs_inode structure
• System crash with RIP nfs_clear_inode+77
• System crashed with following messages:

kernel BUG at fs/nfs/inode.c:113!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/0000:04:00.1/device
CPU 0 
Modules linked in: ipmi_watchdog ipmi_devintf bluetooth rfkill cpufreq_ondemand freq_table mptctl mptbase nfs lockd auth_rpcgss nfs_acl sunrpc bnx2fc cnic uio fcoe libfcoe libfc scsi_transport_fc scsi_tgt 8021q garp stp llc pcc_cpufreq cachefiles fscache(T) ipv6 uinput hpilo hpwdt power_meter sg be2iscsi iscsi_boot_sysfs libiscsi scsi_transport_iscsi be2net microcode serio_raw iTCO_wdt iTCO_vendor_support ioatdma dca shpchp ext4 mbcache jbd2 sd_mod crc_t10dif hpsa(U) video output dm_mirror dm_region_hash dm_log dm_mod [last unloaded: panfs]

Pid: 16344, comm: nwchem Tainted: P           ---------------  T 2.6.32-358.14.1.el6.x86_64 #1 HP ProLiant BL460c Gen8
RIP: 0010:[<ffffffffa031b86d>]  [<ffffffffa031b86d>] nfs_clear_inode+0x4d/0x60 [nfs]
RSP: 0018:ffff8804f2c4ddf8  EFLAGS: 00010282
RAX: ffff88174419ba30 RBX: ffff88174419bbf8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88174419bbf8
RBP: ffff8804f2c4de08 R08: 000000000000000e R09: 0000000000000000
R10: ffff881040240d40 R11: 0000000000000006 R12: ffff88174419bd30
R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff930b7470
FS:  00002b5ea1490a00(0000) GS:ffff880061800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8bfa138000 CR3: 000000039f789000 CR4: 00000000000407f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process nwchem (pid: 16344, threadinfo ffff8804f2c4c000, task ffff88102610e080)
Stack:
 ffff88174419bd30 ffff88174419bbf8 ffff8804f2c4de28 ffffffff8119d04c
<d> ffff88174419bbf8 ffffffff81fcb700 ffff8804f2c4de58 ffffffff8119d806
<d> ffff880d4b328d38 ffff88174419bbf8 ffff8818995a1300 ffff88174419bbf8
Call Trace:
 [<ffffffff8119d04c>] clear_inode+0xac/0x140
 [<ffffffff8119d806>] generic_delete_inode+0x196/0x1d0
 [<ffffffff8119d8a5>] generic_drop_inode+0x65/0x80
 [<ffffffff8119c6f2>] iput+0x62/0x70
 [<ffffffff81191f74>] do_unlinkat+0x124/0x1b0
 [<ffffffff810180b9>] ? ftrace_raw_event_sys_enter+0xd9/0x130
 [<ffffffff81017968>] ? syscall_trace_enter+0x1d8/0x1e0
 [<ffffffff81192016>] sys_unlink+0x16/0x20
 [<ffffffff8100b288>] tracesys+0xd9/0xde
Code: 48 05 38 01 00 00 48 39 87 70 ff ff ff 75 20 e8 5a d7 ff ff 48 89 df e8 d2 86 ff ff 48 89 df e8 aa 60 03 00 48 83 c4 08 5b c9 c3 <0f> 0b eb fe 0f 0b eb fe 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 
RIP  [<ffffffffa031b86d>] nfs_clear_inode+0x4d/0x60 [nfs]
 RSP <ffff8804f2c4ddf8>