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Tue, 03 Jun 2025 17:51:52 -0700 (PDT) MIME-Version: 1.0 References: <68387feb.a70a0220.29d4a0.0830.GAE@google.com> <04c893fe-0498-4847-a525-9efb6d9306da@lucifer.local> <59aed5fa-1d19-442b-9b7b-a99aee9b7689@lucifer.local> In-Reply-To: <59aed5fa-1d19-442b-9b7b-a99aee9b7689@lucifer.local> From: Suren Baghdasaryan Date: Tue, 3 Jun 2025 17:51:41 -0700 X-Gm-Features: AX0GCFvLmXNvNcnG6loABZSWkoE6v8JbRF-Dj9yyYGCaf93cpqx9pKYuItJ3iH0 Message-ID: Subject: Re: [syzbot] [mm?] possible deadlock in __vma_start_write To: Lorenzo Stoakes Cc: syzbot , Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: j559iuxmh94et7p1ggaeisuo3n8n6amg X-Rspamd-Queue-Id: CD9FA1C000B X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1748998313-988020 X-HE-Meta: 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 6DDQr4BP 7iBp5JfHo//ZgNDaOJR3sUqhv/2P27j3l/Q4jHweqPJ5s0B/VwajA9CNXvEityZCGarqZhZld8p/juXwWEu7BiFhvId/gWedOooc3YgG4wjmCybsnhheNKveQHanzYuScDA4G X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Jun 2, 2025 at 7:19=E2=80=AFAM Lorenzo Stoakes wrote: > > On Mon, Jun 02, 2025 at 07:16:40AM -0700, Suren Baghdasaryan wrote: > > On Mon, Jun 2, 2025 at 6:04=E2=80=AFAM Lorenzo Stoakes > > 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 somethin= g > here or we just need to teach lockdep that this situation is ok. > > Hope you had some nice time away anyway :) > > Cheers, Lorenzo