Re: 5.0RC3 fatal trap in supervisor mode

[Steven Bellovin <smb%cs.columbia.edu@localhost>]

On Wed, 15 Apr 2009 12:11:48 -0400
Arnaud Lacombe <lacombar%gmail.com@localhost> wrote:

> Hi,
> 
> FWIW, I just connected a serial cable on a soekris net4501 running
> 5.0RC3, booted a few minute ago. Surprisingly enough, I got a DDB
> prompt:

As I recall, you need to set cnmagic (or something like that) via
sysctl.
> 
> db{0}> dmesg
> Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
> 2005, 2006, 2007, 2008
>     The NetBSD Foundation, Inc.  All rights reserved.
> Copyright (c) 1982, 1986, 1989, 1991, 1993
>     The Regents of the University of California.  All rights reserved.
> 
> NetBSD 5.0_RC3 (GENERIC) #0: Fri Mar 20 12:47:10 UTC 2009
>         
> builds%b1.netbsd.org@localhost:/home/builds/ab/netbsd-5-0-RC3/i386/200903200521Z-o
> bj/home/builds/ab/netbsd-5-0-RC3/src/sys/arch/i386/compile/GENERIC
> total memory = 65148 KB
> avail memory = 52364 KB
> timecounter: Timecounters tick every 10.000 msec
> timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
> Generic PC
> mainbus0 (root)
> ACPI Error (tbxfroot-0308): A valid RSDP was not found [20080321]
> ACPI: unable to initialize ACPI tables: AE_NOT_FOUND
> cpu0 at mainbus0: AMD 486-class, id 0x494
> [...]
> fatal breakpoint trap in supervisor mode
> trap type 1 code 0 eip c053c55c cs c63b0008 eflags 202 cr2 bbae1000
> ilevel 8 db{0}>
> 
> db{0}> bt
> breakpoint(0,3f8,5,c047654b,7,c63f9780,c63edf6c,c0f53000,c0f54000,800)
> at netbsd :breakpoint+0x4
> comintr(c63f9674,c63b5cc8,aa55aa55,aa55aa55,aa55aa55,aa55aa55,aa55aa55,aa55aa55,
> aa55aa55,aa55aa55) at netbsd:comintr+0x575
> DDB lost frame for netbsd:Xintr_legacy4+0xbb, trying 0xc63edf74
> Xintr_legacy4() at netbsd:Xintr_legacy4+0xbb
> --- interrupt ---
> --- switch to interrupt stack ---
> x86_stihlt(c5fc7c80,0,c0a76280,c5fc7c80,c04540e0,c5fc7c80,0,c01002e1,c5fc7c80,0)
>  at netbsd:x86_stihlt+0x5
> idle_loop(c5fc7c80,0,c01002cd,0,c01002cd,0,0,0,0,0) at
> netbsd:idle_loop+0xe6
> 
> the comintr() args looks bogus, but I didn't dig more yet.
> 
> Regards,
>  - Arnaud
>