Hard lockup on CPU due to unsigned module 'zfs'.

Issue

• System panics with below message in logs.

Kernel panic - not syncing: Hard LOCKUP
Pid: 21092, comm: perfd Tainted: P           -- ------------    2.6.32-642.11.1.el6.x86_64 #1
Call Trace:
 <NMI>  [<ffffffff815482b1>] ? panic+0xa7/0x179
 [<ffffffff81011105>] ? show_trace+0x15/0x20
 [<ffffffff810f2a40>] ? watchdog_timer_fn+0x0/0x230
 [<ffffffff8112b807>] ? __perf_event_overflow+0xa7/0x240
 [<ffffffff8101dee6>] ? x86_perf_event_set_period+0xf6/0x180
 [<ffffffff8112be64>] ? perf_event_overflow+0x14/0x20
 [<ffffffff810252bc>] ? intel_pmu_handle_irq+0x21c/0x480
 [<ffffffff8154d659>] ? perf_event_nmi_handler+0x39/0xb0
 [<ffffffff8154f155>] ? notifier_call_chain+0x55/0x80
 [<ffffffff8154f1ba>] ? atomic_notifier_call_chain+0x1a/0x20
 [<ffffffff810acc8e>] ? notify_die+0x2e/0x30
 [<ffffffff8154cdd3>] ? do_nmi+0x1c3/0x350
 [<ffffffff8154c693>] ? nmi+0x83/0x90
 [<ffffffff8154c10e>] ? lock_kernel+0x2e/0x50
 <<EOE>>  [<ffffffff81199d77>] ? default_llseek+0x27/0xa0
 [<ffffffff811981fa>] ? vfs_llseek+0x3a/0x40
 [<ffffffff8119a59e>] ? sys_lseek+0x7e/0xa0
 [<ffffffff810ee25e>] ? __audit_syscall_exit+0x25e/0x290
 [<ffffffff8100b0d2>] ? system_call_fastpath+0x16/0x1b