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Fri, 13 Feb 2026 08:05:18 -0800 (PST) MIME-Version: 1.0 References: <69859728.050a0220.3b3015.0033.GAE@google.com> In-Reply-To: From: Kairui Song Date: Sat, 14 Feb 2026 00:04:41 +0800 X-Gm-Features: AZwV_QhLIH0quixbRtysZ8YmE76vHilB5tNwj7k4LwVDO7mxrympCqPOI_9dgy0 Message-ID: Subject: Re: [syzbot] [cgroups?] [mm?] KASAN: wild-memory-access Read in lookup_swap_cgroup_id (2) To: Shakeel Butt Cc: Dmitry Vyukov , syzbot , akpm@linux-foundation.org, cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, muchun.song@linux.dev, roman.gushchin@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 482EB180009 X-Stat-Signature: rsfdei68quahqunadmz6rjkwhi9osgpf X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1770998720-54445 X-HE-Meta: U2FsdGVkX18KgAZ5dQsHKVYT78v5miH+2YMzSbFQGVJ8nNPXB04sTwKW8VJ5VdTyJAytahEcvxWjBatEDPFG914MwGOoF3DMH/A9G74oXzAnfWPOf/fcZ2bUd0oMti4oOPV7LVhcqiWNobKj5IjPxoAyiKmN+AmUtQAsPXFVHpv70H+vyzVDmfOWc7pm7CfiVTTwDZg7UG+SxZHquOoANDXTyXy1FFSRyl4SyC1aFT7UP0wA/l6hDbNoKxdna3dadTL6fBu+Zayj4ibDYHggcbu3VPE0LyGzE0LUNMxmsbq9K6FzObfLcmbfa7pKJl9M+7XTIzAva6fb8U8P2LlUykC/msnxRCWeAJf5qHZrwInP/M5etpg2jOsOUKKMLyTA5+TrxD6QplCdHgJAc8Vi977Rodf4/g5dU6ob+IisaX5TxPiXxnNCSVEH4VsnxeWaRvAGPzdeAuogrynSLAzjeiQgx36dSQTacyArd6X/GM+V4VxbG3/V9ZxP1xqm2D/PVPJ3eACdrVgWjDAKqIaI+TUy92SOCKHHimkb3H6IBHNQDWebT75li6/xPIb2TNKqaCPQXTIjG/Mt/FiOQ6fMAJ0p7gUfT8JObxObHSdil/t++01aqZHYSW4v0ywHQvMMvSSoExXqJZbypXMHwVYlXVwoKRVMfYBFsmD5MOlqta4tIzS5mN65gmAvr7LV5Pbcir+MuqVNU23fkjbQUEry2f7WxRRiiRKVWgvP9j4xqUI6TQMErPTEvVSr/CHZkKUj68I3Iq0+eQJS77/eNcz6Qtym5VCRjn8Uye3q44YZy7G71wbBoq6kzkCXI2jhbBsQTMgLrPTcowPxBs/PK2+Z40Vh6/bdGoN+KQUV4J5QPEw0wUfDUBJtnv04GGXMs3wQbbBc3nSfLWecXHChNIouZBrNqQl8bpfZWHS3USTsx9McX1NkPNekAIFyjB4scHER39cMV6mtZFaT8Xl3NDK b8arRc// 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 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 Sat, Feb 7, 2026 at 1:30=E2=80=AFAM Shakeel Butt wrote: > > +Kairui Thanks for Cc. I just noticed it while cleaning my mailbox. > On Fri, Feb 06, 2026 at 08:31:19AM +0100, Dmitry Vyukov wrote: > > On Fri, 6 Feb 2026 at 08:24, syzbot > > wrote: > > > > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: 18f7fcd5e69a Linux 6.19-rc8 > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1428fc5a5= 80000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Df1fac0919= 970b671 > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3De12bd9ca481= 57add237a > > > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils f= or Debian) 2.44 > > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > > This happened before: > > https://lore.kernel.org/all/67d04360.050a0220.1939a6.000e.GAE@google.co= m/T/ > > and now 2 more times. > > All reports look similar: exit_mm -> zap_p4d_range > > And all access addresses look the same: top 13 bits are zeros, then > > some garbage (0007fffffffffffc). > > I am pretty sure it's telling us something, some kind of tricky race, > > rather than a previous corruption. Swp entry is somehow invalid? > > Thanks for the report. It would be good to have a reproducer. I will dig > deeper later but good to have eyes from Kairui who has recent changes > in the area. I've just checked the syzbot's console log for the two times it catched the error: https://syzkaller.appspot.com/text?tag=3DCrashLog&x=3D1428fc5a580000 https://syzkaller.appspot.com/text?tag=3DCrashLog&x=3D16c2c694580000 (from https://syzkaller.appspot.com/bug?extid=3De12bd9ca48157add237a) In the first log, before the panic, console is full with: get_swap_device: Bad swap file entry 4003ffffffffffff Which indicates there is at least one, maybe a lot of invalid swap entries of the same value in the page table. Unfortunately that's all it can tell, maybe something corrupted the page table?