Sudden and unexplained reboots

[Noor Dawod]

Folks,

After spending like an hour next to the server itself, I saw it crash
with a 'page fault' panic. All speculations about fans and CPU
over-heating is irrelevant as the server's cooling infrastructure is
working perfectly (2 fans for CPU, 2 fans for disks, 2 external fans, 2
fans for the power supplies, and all are working.)

The panic's details are as follows:

Fatal trap 12		= page fault while in kernel mode
fault virtual address	= 0xbfc407fc
fault code		= supervisor write, page not present
instruction pointer	= 0x8:0xc021d5e3
stack pointer		= 0x10:0xfbf8ae20
frame pointer		= 0x10:0xfbf8ae2c
code segment		= base 0x0, limit 0xfffff, type 0x1b
			  DPL 0, pres 1, def32 1, gran 1
processor eflags		= interrupt enabled, resume, IOPL = 0
current process		= 45671 (ftpd)
interrupt mask		= none
trap number		= 12
panic			= page fault

syncing disks... 56 2
Done
Uptime: 51m35s


Anyone knows what the hell is going on?
By the way, is there a way to dump the panic's message to disk
automatically when a panic occurs? Is there a log somewhere when a panic
occurs?

/Noor


| -----Original Message-----
| From: Charles Sprickman [mailto:spork at inch.com] 
| Sent: Wednesday, June 04, 2003 10:21 PM
| To: Don Lewis
| Cc: bmilekic at unixdaemons.com; freebsd-stable at freebsd.org; 
| noor at comrax.com
| Subject: Re: Sudden and unexplained reboots
| 
| 
| On Wed, 4 Jun 2003, Don Lewis wrote:
| 
| > I'd also check to make sure that all the fans are operational and 
| > something isn't overheating.
| 
| I ran into two boxes with the same bad CPU fans.  Took a 
| while to track it down.  Symptoms were seemingly random 
| reboots, but the reboots could be made to happen more often 
| if the box was loaded up.  If your BIOS has hardware 
| monitoring, check the CPU fan RPMs there as well; one box had 
| a fan that was spinning, but only at about 1000 RPM, which 
| was not enough to keep the CPU in spec.
| 
| Charles
| 
| > _______________________________________________
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| >
|