aacraid and large memory problem (2.6.0-test11)

[Kevin Fenzi]

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Greetings, 

Booting 2.6.0-test11 on a machine with 8GB memory and using the
aacraid driver results in a hang on boot. Passing mem=2048M causes it
to boot normally. 4GB also hangs. 2.6.0-test8 booted normally on this
same hardware. 

8GB memory, dual xeon 3.06mhz with hyperthreading, RedHat 9 on it
currently. 

Happy to provide details on setup/software, etc. 

Perhaps this patch in 2.6.0-test9 is the culprit?
http://www.linuxhq.com/kernel/v2.6/0-test9/drivers/scsi/aacraid/comminit.c

On normal boot: 

SCSI subsystem initialized
Red Hat/Adaptec aacraid driver (1.1.2 Nov 26 2003)
AAC0: kernel 4.0.4 build 6008
AAC0: monitor 4.0.4 build 6008
AAC0: bios 4.0.0 build 6008
AAC0: serial b7e06ffafaf001
AAC0: 64 Bit PAE enabled
scsi0 : aacraid
  Vendor: ADAPTEC   Model: Adaptec RAID5     Rev: V1.0
  Type:   Direct-Access                      ANSI SCSI revision: 02

On the hangs: 

SCSI subsystem initialized
Loading sd_mod.ko module
Loading aacraid.ko module
Red Hat/Adaptec aacraid driver (1.1.2 Nov 26 2003)
aacraid:        NMI ISR: NMI_BUS_INTERFACE_UNIT_ERROR
aacraid: <...repeats 7 more times>
aacraid: NormPrioCommand was received with Fib StructType = 0xff
<hangs>

Thanks for any ideas. 

kevin
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