linux-kernel - Re: getting false SIGTRAP breakpoints in kernel i.e. kernel hung unless gdb remotely attached on x86 & cont is issued

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Date:	Fri, 19 Sep 2008 14:38:49 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	Denis Joseph Barrow <D.Barow@...ion.com>
CC:	KGDB Mailing List <kgdb-bugreport@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, gareth@...inux.com,
	markus.t.metzger@...el.com
Subject: Re: getting false SIGTRAP breakpoints in kernel i.e. kernel hung
 unless gdb remotely attached on x86 & cont is issued

Denis Joseph Barrow wrote:
>
> The patch gets my full blessing even if my blessing is unimportant.
>

Full regression testing has turned up another problem.  If you single
step a system call with kgdb which is the same system call that ptrace
is stepping kgdb silently fails.

The complete fix to both problems is implemented in this patch, and it
has been regression tested across all the architectures.

This patch will be queued to the 2.6.27 fixes.

Jason.

View attachment "user_space_single_step_check_v2.patch" of type "text/x-diff" (4456 bytes)