Fatal trap 3: breakpoint instruction fault

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

Is this a known problem?

All I could find at the Internet is a bit old and not related to chrome
at all.

Erich