Why synchronize_rcu() causing LOCKUP on CPU X ?

Solution In Progress - Updated -

Issue

  • System printed a series of hung_task_timeout_secs messages and finally crashed with following panic:
NMI Watchdog detected LOCKUP on CPU 2
CPU 2 

Pid: 0, comm: swapper Tainted: PF    ---- 2.6.18-308.4.1.el5 #1
RIP: 0010:[<ffffffff8006b9cf>]  [<ffffffff8006b9cf>] mwait_idle_with_hints+0x66/0x67
..
Process swapper (pid: 0, threadinfo ffff81128004a000, task ffff810140d77860)
..
Call Trace:
 [<ffffffff801a498a>] acpi_processor_idle_simple+0x172/0x341
 [<ffffffff801a4818>] acpi_processor_idle_simple+0x0/0x341
 [<ffffffff80048f67>] cpu_idle+0x95/0xb8
 [<ffffffff80078ae2>] start_secondary+0x479/0x488

Environment

  • Red Hat Enterprise Linux 5.8
  • kernel-2.6.18-308.4.1.el5

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