linux-kernel - Re: Sending signals to a kernel thread, broken in 2.6.22

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Message-Id: <200705302209.20963.rjw@sisk.pl>
Date:	Wed, 30 May 2007 22:09:20 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	nigel@...el.suspend2.net
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Sending signals to a kernel thread, broken in 2.6.22

On Wednesday, 30 May 2007 14:38, Nigel Cunningham wrote:
> Hi.
> 
> On Tue, 2007-05-29 at 16:55 -0400, Alan Stern wrote:
> > The g_file_storage driver uses a kernel thread and communicates with
> > that thread in part by means of signals.  It also relies on the thread 
> > receiving signals from userspace as an indication that the thread 
> > should terminate.
> > 
> > This was all working in 2.6.21, but as of 2.6.22-rc3 the signal 
> > delivery mechanism (entirely within the kernel!) is no longer 
> > functional.
> > 
> > What's the story?  Do I need to do something new and different to get 
> > signals working again?  Should I avoid using signals entirely?
> > 
> > Thanks for any help,
> > 
> > Alan Stern
> 
> Hmm. Given Oleg's reply, it could pay to check that freezable kernel
> threads are still being frozen.

I think they are.  Otherwise the freezer would have been failing.

> I'm about to go off to bed, and am away for half the day tomorrow, but
> will check as soon as I can if noone else gets to it first. (Rafael
> added for a heads-up, just in case he hasn't noticed this thread).

I have noticed it, but thanks anyway. :-)

Greetings,
Rafael
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