linux-kernel - Re: [PATCH 0/8] tools/nolibc: add support for stack protector

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Date:   Sun, 26 Mar 2023 18:55:57 +0200
From:   Willy Tarreau <w@....eu>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux@...ssschuh.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] tools/nolibc: add support for stack protector

On Sun, Mar 26, 2023 at 06:05:15PM +0200, Willy Tarreau wrote:
> On Sun, Mar 26, 2023 at 06:00:45PM +0200, Willy Tarreau wrote:
> > On Sun, Mar 26, 2023 at 08:45:55AM -0700, Paul E. McKenney wrote:
> > > Glad I could "help"!  Timers.  Huh.  ;-)
> > > 
> > > Checking v6.2, though the rebase is a bit messy, so I won't be all
> > > that confident in the results.
> > 
> > I got the same as you now. I don't know what I missed before not to
> > face it, maybe it's the consequence of the rebase. I've re-applied
> > the patches on top of 6.2.8 and am retesting now.
> > 
> > I think you don't need to waste more of your time on this for now
> > since we have a reproducer. Thomas and I should take over.
> 
> And it's a 6.3 regression, as 6.2.8 works fine:
> 
>   $ make run
>   (...)
>   Kernel: arch/x86/boot/bzImage is ready  (#2)
>   make[1]: Leaving directory '/g/public/linux/master'
>   126 test(s) passed.
>   $ tail  run.out 
>   Errors during this test: 0
>   
>   Running test 'protection'
>   0 -fstackprotector                                               [OK]
>   Errors during this test: 0
>   
>   Total number of errors: 0
>   Leaving init with final status: 0
>   [    3.388706] ACPI: PM: Preparing to enter system sleep state S5
>   [    3.389424] reboot: Power down
> 
> Now let's have fun bisecting it!

So I have a good news, 6.3-rc1 which dev.2023.03.20a is based on, fails,
while 6.3-rc3 works. I haven't got further yet and am not sure it's useful
to dig further given that it's an already fixed problem that is not related
to the patches in your branch. I don't know if you usually rebase on more
recent tags though.

Willy