Fatal trap 3: breakpoint instruction fault

[Konstantin Belousov]

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 ?

Did you used gdb or strace in the usermode before the trap ?

> 
> 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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