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SubjectRe: 2.5 kernels fail to start second CPU

> I've got a computer here with a pair of Pentium Pro CPUs in it. 2.4 kernels
> have no problem starting both CPUs, only later 2.5 kernels (with or without
> noapic passed on the kernel cmdline).

Here's the 2.4 boot messages for comparison:

Linux version 2.4.18-5smp ( (gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)) #1 SMP Mon Jun 10 15:19:40 EDT 2002
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 0000000000100000 - 0000000008000000 (usable)
BIOS-e820: 00000000fec00000 - 00000000fec09000 (reserved)
BIOS-e820: 00000000ffe80000 - 0000000100000000 (reserved)
0MB HIGHMEM available.
128MB LOWMEM available.
found SMP MP-table at 000f8120
hm, page 000f8000 reserved twice.
hm, page 000f9000 reserved twice.
hm, page 000f8000 reserved twice.
hm, page 000f9000 reserved twice.
On node 0 totalpages: 32768
zone(0): 4096 pages.
zone(1): 28672 pages.
zone(2): 0 pages.
Intel MultiProcessor Specification v1.4
Virtual Wire compatibility mode.
OEM ID: INTEL Product ID: PR440FX APIC at: 0xFEC08000
Processor #0 Pentium(tm) Pro APIC version 17
Processor #12 Pentium(tm) Pro APIC version 17
I/O APIC #13 Version 17 at 0xFEC00000.
Processors: 2
Kernel command line: ro root=/dev/hda2 console=ttyS0,115200 console=tty0 noapic
Initializing CPU#0
Detected 198.668 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 396.49 BogoMIPS
Memory: 125600k/131072k available (1232k kernel code, 5084k reserved, 853k data, 316k init, 0k highmem)
Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount cache hash table entries: 2048 (order: 2, 16384 bytes)
Buffer cache hash table entries: 8192 (order: 3, 32768 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
CPU: L1 I cache: 8K, L1 D cache: 8K
CPU: L2 cache: 256K
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (
mtrr: detected mtrr type: Intel
CPU: L1 I cache: 8K, L1 D cache: 8K
CPU: L2 cache: 256K
Intel machine check reporting enabled on CPU#0.
CPU0: Intel Pentium Pro stepping 09
per-CPU timeslice cutoff: 733.84 usecs.
task migration cache decay timeout: 10 msecs.
enabled ExtINT on CPU#0
ESR value before enabling vector: 00000040
ESR value after enabling vector: 00000000
Booting processor 1/12 eip 2000
Initializing CPU#1
masked ExtINT on CPU#1
ESR value before enabling vector: 00000000
ESR value after enabling vector: 00000000
Calibrating delay loop... 396.49 BogoMIPS
CPU: L1 I cache: 8K, L1 D cache: 8K
CPU: L2 cache: 256K
Intel machine check reporting enabled on CPU#1.
CPU1: Intel Pentium Pro stepping 09
Total of 2 processors activated (792.98 BogoMIPS).
Using local APIC timer interrupts.
calibrating APIC timer ...
..... CPU clock speed is 198.6715 MHz.
..... host bus clock speed is 66.2235 MHz.
cpu: 0, clocks: 662235, slice: 220745
cpu: 1, clocks: 662235, slice: 220745
checking TSC synchronization across CPUs: passed.
migration_task 0 on cpu=0
migration_task 1 on cpu=1
PCI: PCI BIOS revision 2.10 entry at 0xfda11, last bus=0
PCI: Using configuration type 1
PCI: Probing PCI hardware
Limiting direct PCI/PCI transfers.
Activating ISA DMA hang workarounds.
isapnp: Scanning for PnP cards...
isapnp: Card 'CS4236 Audio'
isapnp: 1 Plug & Play card detected total
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
apm: BIOS not found.
Starting kswapd
VFS: Diskquotas version dquot_6.5.0 initialized
pty: 2048 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS MULTIPORT SHARE_IRQ SERIAL_PCI ISAPNP enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
ttyS02 at 0x03e8 (irq = 4) is a 16550A
ttyS03 at 0x02e8 (irq = 3) is a 16550A
Real Time Clock Driver v1.10e
block: 240 slots per queue, batch=60
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX3: IDE controller on PCI bus 00 dev 39
PIIX3: chipset revision 0
PIIX3: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:pio, hdb:pio
hda: IBM-DTLA-307045, ATA DISK drive
ide2: ports already in use, skipping probe
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
blk: queue c03d0e84, I/O limit 4095Mb (mask 0xffffffff)
hda: 90069840 sectors (46116 MB) w/1916KiB Cache, CHS=5606/255/63, (U)DMA
ide-floppy driver 0.99.newide
Partition check:
hda: hda1 hda2 hda3 hda4 < hda5 hda6 >
Floppy drive(s): fd0 is 1.44M
FDC 0 is a National Semiconductor PC87306
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
ide-floppy driver 0.99.newide
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
pci_hotplug: PCI Hot Plug PCI Core version: 0.4
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 1024 buckets, 8Kbytes
TCP: Hash tables configured (established 8192 bind 8192)
Linux IP multicast router 0.06 plus PIM-SM
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 244k freed
VFS: Mounted root (ext2 filesystem).
SCSI subsystem driver Revision: 1.00
kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.6
<Adaptec aic7880 Ultra SCSI adapter>
aic7880: Ultra Wide Channel A, SCSI Id=7, 16/253 SCBs

Journalled Block Device driver loaded
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
Freeing unused kernel memory: 316k freed

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