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Thu, 27 Jul 2023 12:12:49 -0700 (PDT) MIME-Version: 1.0 References: <0000000000004ccc7906017c79e0@google.com> In-Reply-To: From: Aleksandr Nogikh Date: Thu, 27 Jul 2023 21:12:36 +0200 Message-ID: Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2) To: Matthew Wilcox Cc: syzbot , akpm@linux-foundation.org, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 9056B40012 X-Rspam-User: X-Stat-Signature: yo8pr8ncdz3sf514ruqt66dbhtj3ankj X-Rspamd-Server: rspam03 X-HE-Tag: 1690485171-689421 X-HE-Meta: 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 94NgTKE7 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.022248, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jul 27, 2023 at 8:54=E2=80=AFPM Matthew Wilcox wrote: > > On Thu, Jul 27, 2023 at 11:53:02AM -0700, syzbot wrote: > > > On Tue, Jul 25, 2023 at 11:57:22PM -0700, syzbot wrote: > > >> syzbot has bisected this issue to: > > >> > > >> commit a52f58b34afe095ebc5823684eb264404dad6f7b > > >> Author: Matthew Wilcox (Oracle) > > >> Date: Mon Jul 24 18:54:10 2023 +0000 > > >> > > >> mm: handle faults that merely update the accessed bit under the = VMA lock > > >> > > >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=3D17835= 85ea80000 > > >> start commit: [unknown] > > >> git tree: linux-next > > > > > > #syz test linux-next a52f58b34afe095ebc5823684eb264404dad6f7b > > > > "linux-next" does not look like a valid git repo address. > > Well, now, that's your fault, isn't it? You're abbreviating the git > tree in the report, but then refusing to accept the abbreviation in > the response. Good point. There's an issue about this (https://github.com/google/syzkaller/issues/2265), I've added it to my backlog. --=20 Aleksandr