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[2003:cb:c708:e100:4f41:ff29:a59f:8c7a]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38a8e37d2f5sm4952880f8f.17.2025.01.10.08.19.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2025 08:19:55 -0800 (PST) Message-ID: Date: Fri, 10 Jan 2025 17:19:54 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING in __folio_rmap_sanity_checks (2) To: Matthew Wilcox Cc: syzbot , akpm@linux-foundation.org, hdanton@sina.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com 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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IqGEQtcfBYAsFDzSe4w924xoXJLX48nFQFEcngPB6HLGZi64WbHXrjGojYp0yt/cqI/vDDjvbPIqsL4WFK8d9lusYyNMNQQJewjd6RaI1c5gfudnFGSfZQ== 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 10.01.25 17:14, Matthew Wilcox wrote: > On Fri, Jan 10, 2025 at 04:48:03PM +0100, David Hildenbrand wrote: >> 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. > > That would seem hard to accomplish, because both hold the folio lock, > so it wouldn't be just a refcount bug but also a locking bug. Not sure > what this is though. Yeah, but we also have https://lkml.kernel.org/r/6774bf44.050a0220.25abdd.098a.GAE@google.com -- Cheers, David / dhildenb