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[2003:cb:c747:f900:6099:1901:b863:450f]) by smtp.gmail.com with ESMTPSA id h6-20020adf9cc6000000b003375d8b0460sm1847435wre.1.2024.01.11.10.58.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 11 Jan 2024 10:58:01 -0800 (PST) Message-ID: <5ed23cf3-eedd-44aa-a498-d2a9ab046535@redhat.com> Date: Thu, 11 Jan 2024 19:58:00 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in move_pages To: Suren Baghdasaryan , syzbot , Peter Xu Cc: aarcange@redhat.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <00000000000011d709060eadffd3@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp 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xmQeR7zSOxh2Cn45uI1gI979MLiJhWeXIBPgsXm4wRAmq+ow+deCWZAczk1GRDUa869KCA8VpiiBDnMbD+vfxe/dS1fYxkt6iMZNZoEyGcs= 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 11.01.24 19:34, Suren Baghdasaryan wrote: > On Thu, Jan 11, 2024 at 8:44 AM Suren Baghdasaryan wrote: >> >> On Thu, Jan 11, 2024 at 8:40 AM Suren Baghdasaryan wrote: >>> >>> On Thu, Jan 11, 2024 at 8:25 AM syzbot >>> wrote: >>>> >>>> Hello, >>>> >>>> syzbot found the following issue on: >>>> >>>> HEAD commit: e2425464bc87 Add linux-next specific files for 20240105 >>>> git tree: linux-next >>>> console+strace: https://syzkaller.appspot.com/x/log.txt?x=14941cdee80000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=4056b9349f3da8c9 >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=705209281e36404998f6 >>>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 >>>> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=125d0a09e80000 >>>> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15bc7331e80000 >>>> >>>> Downloadable assets: >>>> disk image: https://storage.googleapis.com/syzbot-assets/2f738185e2cf/disk-e2425464.raw.xz >>>> vmlinux: https://storage.googleapis.com/syzbot-assets/b248fcf4ea46/vmlinux-e2425464.xz >>>> kernel image: https://storage.googleapis.com/syzbot-assets/a9945c8223f4/bzImage-e2425464.xz >>>> >>>> The issue was bisected to: >>>> >>>> commit adef440691bab824e39c1b17382322d195e1fab0 >>>> Author: Andrea Arcangeli >>>> Date: Wed Dec 6 10:36:56 2023 +0000 >>>> >>>> userfaultfd: UFFDIO_MOVE uABI >>>> >>>> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11cb6ea9e80000 >>>> final oops: https://syzkaller.appspot.com/x/report.txt?x=13cb6ea9e80000 >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=15cb6ea9e80000 >>>> >>>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>>> Reported-by: syzbot+705209281e36404998f6@syzkaller.appspotmail.com >>>> Fixes: adef440691ba ("userfaultfd: UFFDIO_MOVE uABI") >>>> >>>> do_one_initcall+0x128/0x680 init/main.c:1237 >>>> do_initcall_level init/main.c:1299 [inline] >>>> do_initcalls init/main.c:1315 [inline] >>>> do_basic_setup init/main.c:1334 [inline] >>>> kernel_init_freeable+0x692/0xc30 init/main.c:1552 >>>> kernel_init+0x1c/0x2a0 init/main.c:1442 >>>> ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 >>>> ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 >>>> ------------[ cut here ]------------ >>>> kernel BUG at include/linux/page-flags.h:1035! >>>> invalid opcode: 0000 [#1] PREEMPT SMP KASAN >>>> CPU: 0 PID: 5068 Comm: syz-executor191 Not tainted 6.7.0-rc8-next-20240105-syzkaller #0 >>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 >>>> RIP: 0010:PageAnonExclusive include/linux/page-flags.h:1035 [inline] >>> >>> From a quick look, I think the new ioctl is being used against a >>> file-backed page and that's why PageAnonExclusive() throws this error. >>> I'll confirm if this is indeed the case and will add checks for that >>> case. Thanks! >> >> Hmm. Looking at the reproducer it does not look like a file-backed >> memory... Anyways, I'm on it. > > Looks like the test is trying to move the huge_zero_page. Wonder how > we should handle this. Just fail or do something else? Adding David > and Peter for feedback. You'll need some special-casing to handle that. But it should be fairly easy. -- Cheers, David / dhildenb