Clearcase MVFS panic while running Red Hat Enterprise Linux 6.1 kernel

Issue

• System panics with the following message :

  mvfs: Ok: INFO: MVFS version 7.1.2.3 (Tue May 24 00:40:50 2011)
  (c) Copyright IBM Corp. 1990, 2011.  All Rights Reserved.
  MVFS initialized--adapter built at $Date: 2011-07-13.12:38:11 (UTC) $
  mvfs: Ok: INFO: MVFS: Setting mvfs_largeinit to 15 based on physical memory size of 16334440KB
  FS-Cache: Netfs 'nfs' registered for caching
  BUG: unable to handle kernel NULL pointer dereference at (null)
  IP: [<ffffffffa025c844>] xprt_alloc+0xa4/0xc0 [sunrpc]
  PGD 2158c5067 PUD 20de3d067 PMD 20de9a067 PTE 0
  Oops: 0002 [#1] SMP 
  last sysfs file: /sys/devices/pci0000:00/0000:00:0d.0/0000:05:00.0/0000:06:04.1/local_cpus
  CPU 0 
  Modules linked in: nfs mvfs(U) nfsd lockd nfs_acl auth_rpcgss exportfs autofs4 8021q garp bnx2fc cnic uio fcoe libfcoe stp libfc scsi_transport_fc scsi_tgt llc sunrpc cachefiles fscache(T) bonding ipv6 dm_mirror dm_region_hash dm_log uinput tg3 sg microcode serio_raw ghes hed k8temp hwmon amd64_edac_mod edac_core edac_mce_amd shpchp forcedeth i2c_nforce2 i2c_core ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom sata_nv ata_generic pata_acpi pata_amd dm_mod [last unloaded: freq_table]
  
  Modules linked in: nfs mvfs(U) nfsd lockd nfs_acl auth_rpcgss exportfs autofs4 8021q garp bnx2fc cnic uio fcoe libfcoe stp libfc scsi_transport_fc scsi_tgt llc sunrpc cachefiles fscache(T) bonding ipv6 dm_mirror dm_region_hash dm_log uinput tg3 sg microcode serio_raw ghes hed k8temp hwmon amd64_edac_mod edac_core edac_mce_amd shpchp forcedeth i2c_nforce2 i2c_core ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom sata_nv ata_generic pata_acpi pata_amd dm_mod [last unloaded: freq_table]
  Pid: 25725, comm: cleartool Tainted: G           ---------------- T 2.6.32-131.6.1.el6.x86_64 #1 Sun Fire X2200 M2                         
  RIP: 0010:[<ffffffffa025c844>]  [<ffffffffa025c844>] xprt_alloc+0xa4/0xc0 [sunrpc]
  RSP: 0018:ffff88021424b938  EFLAGS: 00010286
  RAX: ffff88020dcec000 RBX: 0000000000000000 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88020dcee000
  RBP: ffff88021424b958 R08: 0000000000000000 R09: ffff88020dcec000
  R10: 0000000000000000 R11: 0000000000000001 R12: ffff880215d11000
  R13: 0000000000000010 R14: ffff88020f782c40 R15: ffff88021424bb30
  FS:  00007f51636557e0(0000) GS:ffff880028200000(0063) knlGS:00000000f77a38d0
  CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
  CR2: 0000000000000000 CR3: 00000002158c7000 CR4: 00000000000006f0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Process cleartool (pid: 25725, threadinfo ffff88021424a000, task ffff88020dc66100)
  Stack:
   ffff88021424b948 ffff88021424ba08 ffff88020f782744 ffffffffa0475240
  <0> ffff88021424b978 ffffffffa025d478 ffff88021424ba08 ffff88020f782744
  <0> ffff88021424b9a8 ffffffffa025f5d1 ffff88021424b9a8 ffff88021424ba08
  Call Trace:
   [<ffffffffa025d478>] xs_setup_xprt+0x58/0x1a0 [sunrpc]
   [<ffffffffa025f5d1>] xs_setup_udp+0x21/0x2a0 [sunrpc]
   [<ffffffffa025ac6f>] xprt_create_transport+0x5f/0x2a0 [sunrpc]
   [<ffffffffa025a3d8>] rpc_create+0x88/0x6a0 [sunrpc]
   [<ffffffffa0458e06>] mdki_linux_clntkudp_create+0x95/0xcb [mvfs]
   [<ffffffffa0451898>] mvfs_linux_clntkudp_create+0x5d/0x5f [mvfs]
   [<ffffffffa0445654>] mvfs_clnt_get+0x375/0x6e3 [mvfs]
   [<ffffffffa0450526>] ? xdr_void+0x0/0x10 [mvfs]
   [<ffffffffa0445a09>] mfscall+0x47/0xc5 [mvfs]
   [<ffffffff811805bd>] ? do_lookup+0x7d/0x220
   [<ffffffffa044ddec>] ? mvfs_mkviewtag_info_32_to_mvfs_mkviewtag_info+0x86/0x9e [mvfs]
   [<ffffffffa044cb3b>] ? CopyInMvfs_mkviewtag_info+0x5f/0x99 [mvfs]
   [<ffffffffa043eba6>] mvfs_clnt_ping_server+0x76/0x78 [mvfs]
   [<ffffffffa0450526>] ? xdr_void+0x0/0x10 [mvfs]
   [<ffffffffa04480c0>] mvfs_mkviewtag+0xcf/0x992 [mvfs]
   [<ffffffffa044ab7e>] mvfs_mioctl+0x142/0x5b2 [mvfs]
   [<ffffffffa045426d>] ? vnode_fop_open+0x0/0x15f [mvfs]
   [<ffffffffa045c3d1>] ? mdki_copy_from_user+0xe/0x10 [mvfs]
   [<ffffffffa041f1fd>] mvfs_ioctlv_subr+0x140/0x472 [mvfs]
   [<ffffffff81093e1f>] ? up+0x2f/0x50
   [<ffffffffa0435c5f>] ? mvfs_afprele_thr+0x1d/0x29 [mvfs]
   [<ffffffffa0429377>] ? mvfs_enter_fs+0xfc/0x104 [mvfs]
   [<ffffffffa0453f75>] vnode_fop_ioctl+0x64/0x83 [mvfs]
   [<ffffffffa0453fb5>] vnode_fop_compat_ioctl+0x21/0x25 [mvfs]
   [<ffffffff811c2ead>] compat_sys_ioctl+0xed/0x510
   [<ffffffff81047af0>] cstar_dispatch+0x7/0x2e
  Code: 0f 1f 80 00 00 00 00 4b 8d 44 ad 00 be d0 80 00 00 48 8d 3c 80 48 c1 e7 04 e8 19 e5 ef e0 48 85 c0 49 89 84 24 c0 04 00 00 74 b5 <f0> ff 03 49 89 9c 24 10 06 00 00 eb b7 66 66 66 66 66 66 2e 0f 
  RIP  [<ffffffffa025c844>] xprt_alloc+0xa4/0xc0 [sunrpc]
   RSP <ffff88021424b938>
  CR2: 0000000000000000