From owner-freebsd-hackers  Thu Mar 11  9:44:31 1999
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Date: Thu, 11 Mar 1999 11:43:32 -0600 (CST)
Reply-To: greg@uswest.net
Organization: US WEST !NTERACT
From: Greg Rowe <greg@uswest.net>
To: Matthew Dillon <dillon@apollo.backplane.com>
Subject: Re: SMP Woes
Cc: freebsd-hackers@FreeBSD.ORG, David Greenman <dg@root.com>
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Bingo !!! The system is a 1 gig of memory, 4 cpu's. Maxusers down to 64 solved
the Fatal Trap problem. I'll try moving the number up in stages and see where
it breaks. I had been using 256 and a couple times 512 in testing. Thanks.

Greg

On 11-Mar-99 Matthew Dillon wrote:
>     Well, zalloci() can call _zget(), which can call bzero().  Maybe the
>     underscore in the _zget() is preventing DDB from listing it.
> 
>     The call offset in zalloci() in the trace below is zalloci+0x29.  If
>     you disassemble zalloci, you will note that this is the call-return
>     point for _zget:
> 
> 0xf020b59f <zalloci+23>:        pushl  %ebx
> 0xf020b5a0 <zalloci+24>:        call   0xf020b5f8 <_zget>
> 0xf020b5a5 <zalloci+29>:        movl   %eax,%ebx
> 
>     The generic_bzero() call arguments are either bogus, or the stack
>     length argument has been modified by generic_bzero().
> 
>     The fault virtual address is 0, but vm_page_alloc() seems to properly
>     test for m == NULL so this should not be possible.
> 
>     It would be useful to print out the contents of *m from the _zget
>     frame, and also the *z structure.
> 
>     --
> 
>     If this machine has a large amount of memory, it may have overrun its
>     KVA allocation.  This can also happen if you have a large 'maxusers'
>     in the kernel config.  If so, try reducing maxusers to 128 or less.
> 
>                                       -Matt
>                                       Matthew Dillon 
>                                       <dillon@backplane.com>
> 



Greg Rowe <greg@uswest.net>   US WEST -  Internet Service Operations


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