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[2003:d8:2f0d:f000:eec9:2b8d:4913:f32a]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4f00972f3sm19064300f8f.69.2025.06.03.09.22.05 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 03 Jun 2025 09:22:05 -0700 (PDT) Message-ID: Date: Tue, 3 Jun 2025 18:22:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] kernel BUG in sanity_check_pinned_pages To: syzbot , akpm@linux-foundation.org, jgg@ziepe.ca, jhubbard@nvidia.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, peterx@redhat.com, syzkaller-bugs@googlegroups.com, Jens Axboe References: <683f1551.050a0220.55ceb.0017.GAE@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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<683f1551.050a0220.55ceb.0017.GAE@google.com> X-Mimecast-Spam-Score: 1 X-Mimecast-MFC-PROC-ID: zHU_jonjqcOGP6wIfZGjARvKuTieAVHEfv7W4G2PtWs_1748967727 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 273A01C0005 X-Stat-Signature: br14zmsjnmq4cbxgopfambp8cpy43psr X-Rspam-User: X-HE-Tag: 1748967729-502385 X-HE-Meta: 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iGRcsn1kh8M1SP13Ex5x5q6jeydm6aFZgsKhfnF8zL67DYH23xgZ2A4yvbNp447+Sx4Rx70nUDOltvPuc0FZvEbQfJaOcmjJeiEDlLrrcX3YvJtOqWkoDRitXqokX8hy9srGk0BxvSfaTdWgyTujsK8sSh2p3z1VicUYuKbg9QIV/DX0m2+6kyxaZjnlwBzWDuGUTIdBOuk6X+l+GiEcHnCcdiCi0HsPfjVpfvGyyy6LAjkEp+Le7BfQa3NIKfWX4cCzvcWi6z9xVv07n+Tljhxrseoyay0OWbWC+xFvEQv1Rqk1WATsxEYcP/LZZ6NLQW/dEdITX1k1TkTeo4F1EZVxa/dfpeI/xhj2dcdRTi7yYAGF4ea/UoqA9hbN8ZjjTNe7m 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 03.06.25 17:31, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: d7fa1af5b33e Merge branch 'for-next/core' into for-kernelci > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=1457d80c580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=89c13de706fbf07a > dashboard link: https://syzkaller.appspot.com/bug?extid=1d335893772467199ab6 > compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 > userspace arch: arm64 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/da97ad659b2c/disk-d7fa1af5.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/659e123552a8/vmlinux-d7fa1af5.xz > kernel image: https://storage.googleapis.com/syzbot-assets/6ec5dbf4643e/Image-d7fa1af5.gz.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+1d335893772467199ab6@syzkaller.appspotmail.com > > head: ffffffff000001fe 0000000000000028 0000000000000000 0000000000000200 > page dumped because: VM_BUG_ON_PAGE(!PageAnonExclusive(&folio->page) && !PageAnonExclusive(page)) > ------------[ cut here ]------------ > kernel BUG at mm/gup.c:70! > Internal error: Oops - BUG: 00000000f2000800 [#1] SMP > Modules linked in: > > CPU: 1 UID: 0 PID: 115 Comm: kworker/u8:4 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 > Workqueue: iou_exit io_ring_exit_work > pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : sanity_check_pinned_pages+0x7cc/0x7d0 mm/gup.c:69 > lr : sanity_check_pinned_pages+0x7cc/0x7d0 mm/gup.c:69 > sp : ffff800097f17640 > x29: ffff800097f17660 x28: dfff800000000000 x27: 1fffffbff87da000 > x26: 05ffc0000002107c x25: 05ffc0000002107c x24: fffffdffc3ed0000 > x23: fffffdffc3ed0000 x22: ffff800097f176e0 x21: 05ffc0000002107c > x20: 0000000000000000 x19: ffff800097f176e0 x18: 1fffe0003386f276 > x17: 703e2d6f696c6f66 x16: ffff80008adbe9e4 x15: 0000000000000001 > x14: 1fffe0003386f2e2 x13: 0000000000000000 x12: 0000000000000000 > x11: ffff60003386f2e3 x10: 0000000000ff0100 x9 : c8ccd30be98f3f00 > x8 : c8ccd30be98f3f00 x7 : 0000000000000001 x6 : 0000000000000001 > x5 : ffff800097f16d58 x4 : ffff80008f415ba0 x3 : ffff8000807b4b68 > x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000061 > Call trace: > sanity_check_pinned_pages+0x7cc/0x7d0 mm/gup.c:69 (P) > unpin_user_page+0x80/0x10c mm/gup.c:191 > io_release_ubuf+0x84/0xf8 io_uring/rsrc.c:113 > io_buffer_unmap io_uring/rsrc.c:140 [inline] > io_free_rsrc_node+0x250/0x57c io_uring/rsrc.c:513 > io_put_rsrc_node io_uring/rsrc.h:103 [inline] > io_rsrc_data_free+0x148/0x298 io_uring/rsrc.c:197 > io_sqe_buffers_unregister+0x84/0xa0 io_uring/rsrc.c:607 > io_ring_ctx_free+0x48/0x430 io_uring/io_uring.c:2723 > io_ring_exit_work+0x6c4/0x73c io_uring/io_uring.c:2962 > process_one_work+0x7e8/0x156c kernel/workqueue.c:3238 > process_scheduled_works kernel/workqueue.c:3319 [inline] > worker_thread+0x958/0xed8 kernel/workqueue.c:3400 > kthread+0x5fc/0x75c kernel/kthread.c:464 > ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 > Code: 900523a1 910e0021 aa1703e0 97fff8a9 (d4210000) > ---[ end trace 0000000000000000 ]--- So we lost a PAE bit for a pinned folio. [ 97.640225][ T115] page: refcount:512 mapcount:0 mapping:0000000000000000 index:0x20000 pfn:0x13b400 [ 97.640378][ T115] head: order:9 mapcount:511 entire_mapcount:0 nr_pages_mapped:511 pincount:1 The folio is indeed pinned, and it is PTE-mapped (511 PTEs are mapped). The page we are using for unpinning is not mapped (mapcount:0). pfn:0x13b400 indicates that the page we are provided is actually the head page (folio->page). [ 97.640414][ T115] memcg:ffff0000f36b6000 [ 97.640435][ T115] anon flags: 0x5ffc0000002107c(referenced|uptodate|dirty|lru|arch_1|head|swapbacked|node=0|zone=2|lastcpupid=0x7ff) [ 97.640468][ T115] raw: 05ffc0000002107c fffffdffc37be1c8 fffffdffc3d75f08 ffff0000d50c0ee1 [ 97.640490][ T115] raw: 0000000000020000 0000000000000000 00000200ffffffff ffff0000f36b6000 [ 97.640514][ T115] head: 05ffc0000002107c fffffdffc37be1c8 fffffdffc3d75f08 ffff0000d50c0ee1 [ 97.640536][ T115] head: 0000000000020000 0000000000000000 00000200ffffffff ffff0000f36b6000 [ 97.640559][ T115] head: 05ffc00000010a09 fffffdffc3ed0001 000001ff000001fe 00000001ffffffff [ 97.640581][ T115] head: ffffffff000001fe 0000000000000028 0000000000000000 0000000000000200 [ 97.640600][ T115] page dumped because: VM_BUG_ON_PAGE(!PageAnonExclusive(&folio->page) && !PageAnonExclusive(page)) So we effectively only test the head page. Here we don't have the bit set for that page. In gup_fast() we perform a similar sanity check, which didn't trigger at the time we pinned the folio. io_uring ends up calling io_pin_pages() where we call pin_user_pages_fast(), so GUP-fast might indeed trigger. What could trigger this (in weird scenarios, though) is if we used pin_user_page() to obtain a page, then did folio = page_folio(page) and called unpin_user_page(&folio->page) instead of using unpin_folio(). Or using any other page that we didn't pin. It would be a corner case, though. Staring at io_release_ubuf(), that's also not immediately what's happening. There is this coalescing code in io_sqe_buffer_register()->io_check_coalesce_buffer(), maybe ... something is going wrong there? Otherwise, I could only envision (a) some random memory overwrite clearing the bit or (b) some weird race between GUP-fast and PAE clearing that we didn't run into so far. But these sanity checks have been around for a loooong time at this point. Unfortunately, no reproducer :( -- Cheers, David / dhildenb