Most recent kernel where this bug did *NOT* occur:
2.6.18-gentoo-r6
Distribution:
Gentoo 2006.1
Hardware Environment:
4x Dual Core AMD Opteron(tm) Processor 880
Broadcom HT1000 (with PCI-X and SATA)
LSI Logic / Symbios Logic (megaraid_sas)
2x  NetXtreme BCM5780 Gigabit Ethernet
Intel Corporation 82541GI/PI Gigabit Ethernet Controller
Software Environment:
mysql server
Problem Description:
when server bootin up with new kernel i see on CPU1,2,3 this error:
Initializing CPU#1
NMI Watchdog detected LOCKUP on CPU 1
CPU 1
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.20.2 #1
RIP: 0010:[<ffffffff802eabe2>]  [<ffffffff802eabe2>]
read_current_timer+0x2/0x20
RSP: 0018:ffff81021888fe60  EFLAGS: 00000297
RAX: 00000000abbcbcbf RBX: 00000000fffb6e1e RCX: 00000000c0010000
RDX: 000000000000005d RSI: 0000000000000000 RDI: ffff81021888fe90
RBP: 00000000fffb6e1d R08: 0000000000000000 R09: 00000000ffffffff
R10: 00000000ffdb7817 R11: 0000000000000000 R12: 0000000000000000
R13: ffff81021888fe90 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff81021886be40(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006a0
Process swapper (pid: 0, threadinfo ffff81021888e000, task ffff8106200a4e20)
Stack:  ffffffff80207905 0000000000000000 ffffffff802e903a 0000000000000001
 ffff81000103d700 0000000000000000 0000005dabbcbcb5 0000005dabbcbcb5
 0000000000000001 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff80207905>] calibrate_delay+0xf5/0x380
 [<ffffffff802e903a>] strstr+0x3a/0x80
 [<ffffffff8051b9f2>] smp_callin+0xb2/0x110
 [<ffffffff8051c618>] start_secondary+0x18/0x520


Code: 48 c1 e2 20 89 c0 48 09 d0 48 89 07 31 c0 c3 66 66 66 90 66
 <0>Kernel panic - not syncing: Attempted to kill the idle task!
 Stuck ??
Inquiring remote APIC #1...
... APIC #1 ID: 01000000
... APIC #1 VERSION: 00040010
... APIC #1 SPIV: 000000ff

and when system is UP i see onlu cores 0,4,5,6,7

Steps to reproduce: