kernel panic with greater that 8 GB of memory

Steve Kargl sgk at
Mon Nov 29 15:32:11 PST 2004

On Mon, Nov 29, 2004 at 01:13:41PM -0800, Steve Kargl wrote:
> kmem_suballoc: bad status return of 3
> panic: kmem_suballoc
> cpuid = 0
> KDB: stack backtrace:
> kdb_backtrace() at kdb_backtrace+0x37
> panic() at painc+0x1d1
> kmem_suballoc() at kmem_suballoc+0x93
> kmeminit() at kmeminit+0x16d
> mi_startuup() at mi_startup+0xb6
> btext90 at btext+0x2c
> KDB: enter: panic
> [thread pid 0 tid 0]
> This is a Tyan K8S Pro motherboard with 16 GB of PC2700
> Cosair ECC memory.  The BIOS was flashed to the latest
> available from Tyan.  The scheduler is 4BSD.  There are
> no ATA devices in the system and no ATA subsystem in
> the kernel.  This a SCSI only box.   World and kernel
> were rebuilt today with CFLAGS=-O -pipe and
> COPTFLAGS=-O -pipe.
> If I set hw.physmem="#G" n /boot/loader.conf where # is
> less than or equal to 8 the box boots up (see dmesg below).
> If # > 8, then we have the above panic.
> Any ideas where to look for the a fix?

(dmesg snipped)
(CC'd to -current because the may impact any system with >8 GB of ram)

As a data point, I've downloaded, burned, and booted the netbsd/amd64
ISO image.  Netbsd's dmesg shows that netbsd correctly finds 16 GB
of memory on the system.  


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