Issue

• After updating the BIOS from 7/15/2012 to 12/14/2012 on HP ProLiant machine, the server hangs during boot with stack trace messages.

Process swapper (pid: 1, threadinfo ffff88082c424000, task ffff88102caf0040)
Stack:
 00000001003f0025 000000000000001f 0000000000000040 0000000000000000
<0> 000000000000001f 0000000000000000 0000000000000000 00000000ffffffff
<0> ffff88082c425ea0 0000000005846a0f ffffffff81c00340 0000000000015e00
Call Trace:
 [<ffffffff81025aa3>] ? mtrr_aps_init+0x33/0x40
 [<ffffffff81c2e511>] ? native_smp_cpus_done+0x111/0x150
 [<ffffffff81c1f7ea>] ? kernel_init+0x1bc/0x2fe
 [<ffffffff8100c14a>] ? child_rip+0xa/0x20
 [<ffffffff81c1f62e>] ? kernel_init+0x0/0x2fe
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
Code: 81 4c 89 f2 89 c7 44 89 45 98 e8 27 0f 0a 00 8b 35 a1 04 bd 00 44 8b 45 98 eb a3 0f 1f 00 8b 45 b0 85 c0 74 10 90 f3 90 8b 45 b0 <85> c0 75 f7 8b 35 81 04 bd 00 48 8b 3d 6a 15 dc 00 e8 85 3d 25 
Call Trace:
 [<ffffffff81025aa3>] ? mtrr_aps_init+0x33/0x40
 [<ffffffff81c2e511>] ? native_smp_cpus_done+0x111/0x150
 [<ffffffff81c1f7ea>] ? kernel_init+0x1bc/0x2fe
 [<ffffffff8100c14a>] ? child_rip+0xa/0x20
 [<ffffffff81c1f62e>] ? kernel_init+0x0/0x2fe
 [<ffffffff8100c140>] ? child_rip+0x0/0x20
BUG: soft lockup - CPU#0 stuck for 67s! [swapper:1]

• See the Diagnostic Steps section for more detail