System hangs with "BUG: soft lockup" on linuxshield:doScan

Issue

• System logs several soft lockup events with similar call traces:

kernel: BUG: soft lockup - CPU#36 stuck for 60s! [oracle:7551]
kernel: CPU 36:
kernel: Modules linked in: ppdev iptable_filter ip_tables x_tables oracleacfs(PU) oracleadvm(PU) oracleoks(PU) linuxshield(U) lshook(U) mptctl mptbase nfsd exportfs auth_rpcgs»
kernel: Pid: 7551, comm: oracle Tainted: P     --------------------    2.6.18-400.1.1.el5 #1
kernel: RIP: 0010:[<ffffffff80064bdf>]  [<ffffffff80064bdf>] .text.lock.spinlock+0x5/0x30
kernel: RSP: 0018:ffff81db0125fb90  EFLAGS: 00000282
kernel: RAX: ffff81a9db3eeb30 RBX: ffff813fc886c588 RCX: ffff81a83c06d138
kernel: RDX: ffff811409355a80 RSI: 0000000000000292 RDI: ffffffff88bde218
kernel: RBP: ffff81d7bd091268 R08: ffff813fc886c588 R09: 0000000000000000
kernel: R10: ffff81144f432780 R11: 00000000000000f0 R12: ffffffff88bc39c3
kernel: R13: 0000000000000000 R14: ffffffff88bc1545 R15: ffffffff800420ba
kernel: FS:  00002adf15e3be30(0000) GS:ffff818120a155c0(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 00002b16201cc000 CR3: 000000a686235000 CR4: 00000000000006a0
kernel:·
kernel: Call Trace:
kernel:  [<ffffffff88bd3d50>] :linuxshield:doScan+0x466/0xd91
kernel:  [<ffffffff88bd3502>] :linuxshield:cacheLookup+0x96/0x152
kernel:  [<ffffffff88bd540d>] :linuxshield:SC_doScan+0x108/0x115
kernel:  [<ffffffff88bd263e>] :linuxshield:openHook+0x143/0x1c9
kernel:  [<ffffffff88bc2dcc>] :lshook:invokeCallbacks+0x32a/0x4f7
kernel:  [<ffffffff8002d0fe>] mntput_no_expire+0x19/0x89
kernel:  [<ffffffff8000ec1a>] link_path_walk+0xac/0xb8
kernel:  [<ffffffff80064624>] __down_read+0x12/0x92
kernel:  [<ffffffff800227f0>] __up_read+0x19/0x7f
kernel:  [<ffffffff800420ba>] generic_file_open+0x0/0x19
kernel:  [<ffffffff8804c3ed>] :ext3:ext3_release_file+0x0/0x73
kernel:  [<ffffffff88bc394a>] :lshook:fileOpenHook+0x216/0x2a0
kernel:  [<ffffffff88bc3734>] :lshook:fileOpenHook+0x0/0x2a0
kernel:  [<ffffffff8001eff0>] __dentry_open+0xd9/0x1dc
kernel:  [<ffffffff80027b95>] do_filp_open+0x2a/0x38
kernel:  [<ffffffff80019faf>] do_sys_open+0x44/0xbe
kernel:  [<ffffffff8885a92f>] :seos:my_open+0x145/0x230
kernel:  [<ffffffff8005d29e>] tracesys+0xd5/0xdf