linux-kernel - Re: s390 && user_enable_single_step() (Was: odd utrace testing results on s390x)

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Message-Id: <20100107214642.579F27300@magilla.sf.frob.com>
Date:	Thu,  7 Jan 2010 13:46:42 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, caiqian@...hat.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Jan Kratochvil <jkratoch@...hat.com>,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	utrace-devel@...hat.com
Subject: Re: s390 && user_enable_single_step() (Was: odd utrace testing
 results on s390x)

> Clear the TIF_SINGLE_STEP bit in copy_thread. If the new process is
> not auto-attached by the tracer it is wrong to delivere SIGTRAP to
> the new process.

The change is right, but this log entry is confusing.  "auto-attached" has
nothing to do with it, nor does anything about tracing the new process or
not.  The new process has not experienced a PER trap of its own, so it is
wrong to deliver a SIGTRAP that is meant for its creator.


Thanks,
Roland
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