linux-kernel - Re: [PATCH 2.6.32 18/62] s390/hibernate: fix save and restore of kernel text section

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Message-ID: <20150915074437.GB4051@osiris>
Date:	Tue, 15 Sep 2015 09:44:37 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Willy Tarreau <w@....eu>
Cc:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [PATCH 2.6.32 18/62] s390/hibernate: fix save and restore of
 kernel text section

On Tue, Sep 15, 2015 at 09:41:49AM +0200, Willy Tarreau wrote:
> On Tue, Sep 15, 2015 at 08:09:27AM +0200, Heiko Carstens wrote:
> > On Tue, Sep 15, 2015 at 03:10:45AM +0100, Ben Hutchings wrote:
> > > On Sun, 2015-09-13 at 00:56 +0200, Willy Tarreau wrote:
> > > > 2.6.32-longterm review patch.  If anyone has any objections, please let me know.
> > > > 
> > > > ------------------
> > > > 
> > > > From: Heiko Carstens <heiko.carstens@...ibm.com>
> > > > 
> > > > commit d74419495633493c9cd3f2bbeb7f3529d0edded6 upstream.
> > > > 
> > > > Sebastian reported a crash caused by a jump label mismatch after resume.
> > > > This happens because we do not save the kernel text section during suspend
> > > > and therefore also do not restore it during resume, but use the kernel image
> > > > that restores the old system.
> > > [...]
> > > 
> > > I don't think this is needed because jump labels aren't implemented in
> > > 2.6.32.  But maybe there was some other mechanism that changes the
> > > kernel text on s390?
> > 
> > Broken jump labels were the symptons when the problem was reported. However
> > we lose everything that modifies kernel text without this patch.
> > If it's not jump labels then there is still kprobes around where we have
> > the same problem.
> > Probably the patch description should have been better.
> 
> OK so in the end you suggest you keep it in both 2.6.32 and 3.2 ?

Yes, please.

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