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AJvYcCUoatrIOj0kdne0tgwmtiaWKC8KRx+8LizE61/nJGc0IpHNzWuSNVhCiLV9+hDKfjVgisgBRySq3g==@kvack.org X-Gm-Message-State: AOJu0YwXLTEK6fcbsjU7xvfmL3zxY5yb+FUsGKxLcRxNz6zSYFHIUf5t mlcO2YAY3Ez0vGJ71KlFfuoEPLY6w0QdXS6dYyF6aTWlXBcGg5olydpqBminXzyjFw/LBj2XEdS bzU/fSdsqbbYUyGTbZjCEyHWZGYTw2NPW9S3S X-Google-Smtp-Source: AGHT+IHfjoq1ktjUPs+hcA+Bukrt/keBfIi4zzuowcoaoVnZ39XvkrU9DCu5qOXzN8o6rrz4Sy1xQPbgU3kVsT8F39k= X-Received: by 2002:a17:90b:2403:b0:2ea:3f34:f190 with SMTP id 98e67ed59e1d1-2ea3f34f37fmr9172616a91.25.1731935586513; Mon, 18 Nov 2024 05:13:06 -0800 (PST) MIME-Version: 1.0 References: <6739c892.050a0220.e1c64.0013.GAE@google.com> In-Reply-To: From: Aleksandr Nogikh Date: Mon, 18 Nov 2024 14:12:54 +0100 Message-ID: Subject: Re: [syzbot] [mm?] general protection fault in mas_store_prealloc To: "Liam R. Howlett" , syzbot , akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam10 X-Stat-Signature: zm1o8iuwjy7p5t3ckscdeyw5s5rkms4j X-Rspamd-Queue-Id: 0A7804000D X-Rspam-User: X-HE-Tag: 1731935549-398652 X-HE-Meta: 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 +b89jaJ2 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi Liam, On Mon, Nov 18, 2024 at 3:49=E2=80=AFAM 'Liam R. Howlett' via syzkaller-bug= s wrote: > > * syzbot [241117 = 05:42]: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 8e9a54d7181b Merge remote-tracking branch 'iommu/arm/sm= mu'.. > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/lin= ux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=3D17b0ace8580= 000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=3Da1eb85a42cb= 8ccec > > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dbc6bfc25a68b7= a020ee1 > > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for D= ebian) 2.40 > > userspace arch: arm64 > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=3D147521a79= 80000 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=3D102e14c0580= 000 > > > > Downloadable assets: > > disk image: https://storage.googleapis.com/syzbot-assets/ad658fb4d0a2/d= isk-8e9a54d7.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/1b7754fa8c67/vmli= nux-8e9a54d7.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/50315382fefb= /Image-8e9a54d7.gz.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the co= mmit: > > Reported-by: syzbot+bc6bfc25a68b7a020ee1@syzkaller.appspotmail.com > > I was unable to get this reproducer to work on my own image, even using > the config and compiler specified in the report. The injection was not > happening at the same location as the crash reports. > > After using the provided disk (which was tricky), I was able to get it > to work. Just in case: did you follow the official syzbot instructions on reproducing the bugs from the attached assets? [1] If yes, what extra information could have made the process simpler for you? [1] https://github.com/google/syzkaller/blob/master/docs/syzbot_assets.md > Booting was painfully slow, and makes me wonder if there is a > better way for reproducing issues in the future. I guess that unless you run it on an arm64 device with a nested virtualization support, this bug's reproduction will be slow anyway :( If you recompile the kernel image without CONFIG_KASAN and CONFIG_KCOV, that should speed it up to some degree. > > I've been debating just abusing the bot to debug, but it will spam the > entire list, but I have it reproducing now. Syzbot only makes sure that linux-kernel@vger.kernel.org and syzkaller-bugs@googlegroups.com are included, both are not really assumed to be closely followed by human beings. So I think it should be totally fine to debug with syzbot if you just Cc those two lists. --=20 Aleksandr > > Thanks, > Liam >