kern/100774: libthr + gdb + triggered breakpoint results in panic

David Xu davidxu at freebsd.org
Wed Jul 26 07:00:39 UTC 2006


The following reply was made to PR kern/100774; it has been noted by GNATS.

From: David Xu <davidxu at freebsd.org>
To: freebsd-bugs at freebsd.org
Cc: Christoph Mallon <christoph.mallon at gmx.de>,
 freebsd-gnats-submit at freebsd.org
Subject: Re: kern/100774: libthr + gdb + triggered breakpoint results in panic
Date: Wed, 26 Jul 2006 14:56:33 +0800

 On Tuesday 25 July 2006 14:52, Christoph Mallon wrote:
 > David Xu wrote:
 > > On Monday 24 July 2006 19:20, Christoph Mallon wrote:
 > >>> Number:         100774
 > >>> Category:       kern
 > >>> Synopsis:       libthr + gdb + triggered breakpoint results in panic
 > >
 > > Do you have kernel backtrace ?
 > >
 > > David Xu
 >
 > No, sorry.
 > I just compiled a new kernel (sources from today, 20060725) with DDB
 > support, but the problem doesn't occur there.
 >
 > 	Christoph
 > _______________________________________________
 >
 This might be fixed by the change:
 http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/ptrace_machdep.c.diff?r1=1.3.2.1&r2=1.3.2.2&f=h
 
 But I am not sure, though I had seen kernel crashed when debugging
 applications using floating-point, I doubt gdb sometimes messed mxcsr
 register.
 
 David Xu


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