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[2003:cb:c708:e100:4f41:ff29:a59f:8c7a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-436ed48f4b2sm42523835e9.24.2025.01.10.07.48.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 07:48:04 -0800 (PST) Message-ID: Date: Fri, 10 Jan 2025 16:48:03 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2) To: syzbot , akpm@linux-foundation.org, hdanton@sina.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org References: <676fee37.050a0220.2f3838.0497.GAE@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK 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gIXfa6TI78of3+F06ks/CZqCb791Ij+NbbXCxoitQbllDIHGQu6LQEHvfEXb/AbpkRQu9JxvEW0= 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 28.12.24 13:25, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1661050f980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9c90bb7161a56c88 > dashboard link: https://syzkaller.appspot.com/bug?extid=c0673e1f1f054fac28c2 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17438af8580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=101006df980000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/98a974fc662d/disk-8155b4ef.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/2dea9b72f624/vmlinux-8155b4ef.xz > kernel image: https://storage.googleapis.com/syzbot-assets/593a42b9eb34/bzImage-8155b4ef.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/5f780361c9ef/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c0673e1f1f054fac28c2@syzkaller.appspotmail.com > > xfs_vn_setattr+0x25d/0x320 fs/xfs/xfs_iops.c:1065 > notify_change+0xbca/0xe90 fs/attr.c:552 > do_truncate+0x220/0x310 fs/open.c:65 > do_ftruncate+0x4a1/0x540 fs/open.c:192 > do_sys_ftruncate fs/open.c:207 [inline] > __do_sys_ftruncate fs/open.c:212 [inline] > __se_sys_ftruncate fs/open.c:210 [inline] > __x64_sys_ftruncate+0x94/0xf0 fs/open.c:210 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 11276 at ./include/linux/rmap.h:217 __folio_rmap_sanity_checks+0x369/0x590 include/linux/rmap.h:217 > Modules linked in: > CPU: 1 UID: 0 PID: 11276 Comm: syz-executor139 Not tainted 6.13.0-rc3-next-20241220-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 > RIP: 0010:__folio_rmap_sanity_checks+0x369/0x590 include/linux/rmap.h:217 > Code: 0f 0b 90 e9 e9 fd ff ff e8 64 cb ab ff 48 ff cb e9 34 fe ff ff e8 57 cb ab ff 4c 89 e7 48 c7 c6 e0 a7 15 8c e8 08 a4 f5 ff 90 <0f> 0b 90 e9 25 fe ff ff e8 3a cb ab ff 4c 89 e7 48 c7 c6 40 a9 15 > RSP: 0018:ffffc9000e67efd8 EFLAGS: 00010246 > RAX: 8577b516ce8a9400 RBX: ffffea0001a58080 RCX: ffffc9000e67eb03 > RDX: 0000000000000005 RSI: ffffffff8c0aaba0 RDI: ffffffff8c5fed00 > RBP: 00000000000024c0 R08: ffffffff901ab1f7 R09: 1ffffffff203563e > R10: dffffc0000000000 R11: fffffbfff203563f R12: ffffea0001a50000 > R13: ffffea0001a55c00 R14: 0000000000000000 R15: 0000000000000093 > FS: 00007f885c85f6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f88545b7000 CR3: 000000007fea2000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __folio_add_rmap mm/rmap.c:1170 [inline] > __folio_add_file_rmap mm/rmap.c:1489 [inline] > folio_add_file_rmap_ptes+0x82/0x380 mm/rmap.c:1511 > set_pte_range+0x30c/0x750 mm/memory.c:5136 If I would have to guess, I would assume that we have a refcount issue such that we succeed in splitting a folio while concurrently mapping it. -- Cheers, David / dhildenb