Fatal trap 3: breakpoint instruction fault

[Erich Dollansky]

Hi,

On Thu, 23 May 2013 07:23:33 +0300
Konstantin Belousov <kostikbel at gmail.com> wrote:

> On Thu, May 23, 2013 at 10:25:24AM +0700, Erich Dollansky wrote:
> > Hi,
> > 
> > I updated my system over night. It suddenly reboots and I find some
> > 20 entries like this in /var/log/message:
> > 
> > May 23 10:05:28 X220 kernel: Fatal trap 3: breakpoint instruction
> > fault while in kernel mode 
> > May 23 10:05:28 X220 kernel: cpuid = 0; apic id = 00 
> > May 23 10:05:28 X220 kernel: instruction pointer	=
> > 0x20:0xffffffff80809f7e 
> > May 23 10:05:28 X220 kernel: stack pointer	        =
> > 0x28:0xffffff82336de7c0 
> > May 23 10:05:28 X220 kernel: frame pointer	        =
> > 0x28:0xffffff82336de7e0 
> > May 23 10:05:28 X220 kernel: code segment		= base 0x0,
> > limit 0xfffff, type 0x1b 
> > May 23 10:05:28 X220 kernel: = DPL 0, pres 1, long 1, def32 0, gran
> > 1 May 23 10:05:28 X220 kernel: processor eflags = IOPL = 0 
> > May 23 10:05:28 X220 kernel: current process = 2043 (chrome) 
> > May 23 10:05:28 X220 kernel: trap number = 3 
> > May 23 10:05:28 X220 kernel:
> > panic: breakpoint instruction fault 
> > May 23 10:05:28 X220 kernel: cpuid = 0 
> > May 23 10:05:28 X220 kernel: KDB: enter: panic 
> > May 23 10:05:28 X220 kernel: 
> > May 23 10:05:28 X220 kernel: 
> > 
> > All messages have chrome as the current process but different values
> > for IP and SP.
> > 
> > uname -a says:
> > 
> > FreeBSD X220.ovitrap.com 10.0-CURRENT FreeBSD 10.0-CURRENT #24
> > r250918: Thu May 23 09:00:07 WIT 2013
> > erich at X220.ovitrap.com:/usr/obj/usr/src/sys/X220  amd64
> Do you have ddb compiled in ?  If yes, did you used it before the
> breakpoint trap was reported ?

to be honest, I do not know if ddb is compiled in.

The main problem would be that this is currently only machine. It also
has no serial links. Just USB and Ethernet.
> 
> Did you used gdb or strace in the usermode before the trap ?
> 
No debugger of any kind was running.

Let me tell you what I normally do when I start this machine. It has an
Intel i7 CPU and as such it uses KMS.

- log-on as a normal user.
- start X
- start a few xterms
- start wireless network in one of them
- start chrome to log-on onto the LAN of the client
- start claws mail
- start arora

I think that I did not come further as I remember to get a message from
my daughter as the last activity of the machine in chrome.

The screen went black then and the machine started to reboot.

I think that there is not much helpful information I could give.

I work since then much longer without any problems.

Erich
> > 
> > Is this a known problem?
> > 
> > All I could find at the Internet is a bit old and not related to
> > chrome at all.
> > 
> > Erich
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