linux-kernel - Re: [syzbot] [mm?] possible deadlock in __vma_start

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Message-ID: <CAJuCfpHeHYxo1ZvG-mjDxcHd63nq_g9o5i-au-wZWHj+_dRy_A@mail.gmail.com>
Date: Tue, 3 Jun 2025 17:51:41 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: syzbot <syzbot+23de6daeb71241d36a18@...kaller.appspotmail.com>, 
	Liam.Howlett@...cle.com, akpm@...ux-foundation.org, jannh@...gle.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, pfalcato@...e.de, 
	syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: Re: [syzbot] [mm?] possible deadlock in __vma_start_write

On Mon, Jun 2, 2025 at 7:19 AM Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
>
> On Mon, Jun 02, 2025 at 07:16:40AM -0700, Suren Baghdasaryan wrote:
> > On Mon, Jun 2, 2025 at 6:04 AM Lorenzo Stoakes
> > <lorenzo.stoakes@...cle.com> wrote:
> > >
> > > +cc Suren
> > >
> > > Suren - could you take a look at this please?
> >
> > Sure. I'll take a look today or tomorrow once I sort out my email
> > backlog. I was away for 10 days and have 2K emails to go through.
> >
>

I spent some time trying to connect the dots and still don't have the
definitive answer. I'll dive into it again tomorrow and post once I
have something useful.
Thanks,
Suren.

> Oh man and I thought my inbox was bad :) Sorry to add to it!
>
> No pressure, just a weird locking case, I'm wondering if there's something
> here or we just need to teach lockdep that this situation is ok.
>
> Hope you had some nice time away anyway :)
>
> Cheers, Lorenzo