Error "NMI Watchdog detected LOCKUP" due to writer starvation on tasklist_lock

Issue

• System reported this panic message:

NMI Watchdog detected LOCKUP on CPU 20
CPU 20 
Modules linked in: mptctl mptbase autofs4 nfs nfs_acl lockd sunrpc bonding be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i libcxgbi cxgb3 8021q libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec i2c_core dell_wmi wmi button battery asus_acpi acpi_memhotplug ac parport_pc lp parport joydev sr_mod cdrom sg i7core_edac edac_mc tpm_tis bnx2 tpm tpm_bios shpchp hpilo serio_raw pcspkr dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod usb_storage ata_piix libata cciss sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 16398, comm: impalad Not tainted 2.6.18-348.18.1.el5 #1
RIP: 0010:[<ffffffff80062191>]  [<ffffffff80062191>] __write_lock_failed+0x9/0x20
RSP: 0018:ffff8113f74dbe28  EFLAGS: 00000083
RAX: ffff81173d1477f0 RBX: ffff8124194cadf8 RCX: 0000000000000180
RDX: 0000a8c82fe04680 RSI: 0000000000000003 RDI: ffffffff8044de80
RBP: 0000000000000000 R08: 0000000000000018 R09: 0000000000000028
R10: ffff8124194cab40 R11: ffff811218a5a7b0 R12: ffff811218a5a7b0
R13: ffff8124194cab40 R14: 00002b8dc08bb9d0 R15: 0000000000010800
FS:  00002b7e8c055940(0000) GS:ffff81121fc56840(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00002b8dc08bb958 CR3: 0000000e592f4000 CR4: 00000000000006a0
Process impalad (pid: 16398, threadinfo ffff8113f74da000, task ffff81173d1477f0)
Stack:  ffffffff80064b93 ffffffff800205d5 00002b8dc08bb9d0 0000000000000000
 ffff8113f74dbf58 00002b8dc08bb1f0 00000000003d0f00 0000000000010000
 ffff811218a5a7b0 ffff811204f18780 00000000003d0f00 ffffffff800a19fc
Call Trace:
 [<ffffffff80064b93>] _write_lock_irq+0xf/0x10
 [<ffffffff800205d5>] copy_process+0x101b/0x1636
 [<ffffffff800a19fc>] alloc_pid+0x228/0x2c4
 [<ffffffff8003154b>] do_fork+0x69/0x1c1
 [<ffffffff8005d29e>] tracesys+0xd5/0xdf
 [<ffffffff8005d437>] ptregscall_common+0x67/0xac