kern/119868: 7.0 kernel panic during boot with ZFS and WD1600JS

[Johan A. van Zanten]

The following reply was made to PR kern/119868; it has been noted by GNATS.

From: Johan A. van Zanten <johan at giantfoo.org>
To: remko at FreeBSD.org
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/119868: 7.0 kernel panic during boot with ZFS and WD1600JS
Date: Tue, 22 Jan 2008 22:12:06 -0600 (CST)

 Remko Lodder <remko at FreeBSD.org> wrote:
 > Johan A. van Zanten wrote:
 > > 
 > > Fatal trap 12: page fault while in kernel mode
 > > cpuid = 0; apic id = 01
 > > fault virtual address   = 0x3f80
 > > fault code              = supervisors read, page not present
 > > instruction pointer	= 0x20:0xc06d0e2c
 > > stack pointer		= 0x28:0xe2fb4b60
 > > frame pointer		= 0x28:0xe2fb4c58
 > > 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		= 2 (g_event)
 > > trap number		= 12
 > > panic: page fault
 > > Uptime: 1s
 > > Cannot dump. No dumpdevice defined.
 > > Automatic reboot in 15 seconds - press a key on the console to abort
 > > 
 > 
 > Hello,
 > 
 > Please set a dumpdevice see 
 > http://www.freebsd.org/doc/en/books/developers-handbook/kerneldebug.html 
 > for more information. We need this to be able to see what is going on 
 > and what is going nuts. Without this we will not be able (imo) to 
 > resolve your problem.
 
 Can you give and example of the syntax for specifying the dump device in
 the kernel config?
 
  The crash seems to be ahppening before dumpon is run. According to the
 web page you cite:
 
   Alternatively, the dump device can be hard-coded via the dump clause in
   the config(5) line of a kernel configuration file. This approach is
   deprecated and should be used only if a kernel is crashing before
   dumpon(8) can be executed.
 
  But i cannot find any example of the syntax for the "dump" clause in
  /usr/src/sys/conf or in config(5).
 
 
 Thanks, johan