vmalloc=256M broken on x86 on >4G ram?

[Simen Thoresen <simentt@dolphinics.no>]

Hi all,

I'm seeing a somewhat curious problem on an Opteron-machine with 5G ram. 
  For outside reasons (driver development for our own cards) we have to 
set the vmalloc=256M parameter when booting the kernel. This causes the 
machine to panic due to missing a root filesystem right when the SCSI 
subsystem should have been initialized. I do not see any error messages, 
but do not have the full console log. Nothing noticeable on what is on 
the screen, at aleast.

On a working boot (ie not with vmalloc=256M specified), the system 
continues loading the MPT drivers;

....
drivers/usb/input/hid-core.c: v2.01:USB HID core driver
mice: PS/2 mouse device common for all mice
md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27
NET: Registered protocol family 2
IP: routing cache hash table of 32768 buckets, 512Kbytes
TCP established hash table entries: 262144 (order: 10, 4194304 bytes)
TCP bind hash table entries: 65536 (order: 7, 786432 bytes)
TCP: Hash tables configured (established 262144 bind 65536)
Initializing IPsec netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
ACPI wakeup devices:
TP2P  USB G0PA G0PB G1PA G1PB
ACPI: (supports S0 S1 S5)
Freeing unused kernel memory: 236k freed
SCSI subsystem initialized
Fusion MPT base driver 3.01.20
Copyright (c) 1999-2004 LSI Logic Corporation
ACPI: PCI Interrupt 0000:0e:01.0[A] -> GSI 29 (level, low) -> IRQ 169
mptbase: Initiating ioc0 bringup
....

On systems with <=4G ram, this does not occur. Also, just removing the 
vmalloc=256M (or changing it to =128M) parameter causes the system to 
continue booting.

I've tested this on the RH 2.6.9-11 kernel and also on the most recent 
kernel I could get to work (2.6.12.6 - there seems to be a problem with 
RHs mkinitrd for 2.6.13 and the MPT-drivers) with the same result.

Is this known? Anything I can do to assist with diagnosing or fixing this?

-S
--
Simen Thoresen, Wulfkit Support, Dolphin ICS
http://www.tysland.com/~simentt/cluster
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