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Wed, 14 Jan 2026 08:32:23 -0800 (PST) Date: Wed, 14 Jan 2026 08:32:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6967c517.050a0220.150504.0007.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, david@kernel.org, harry.yoo@oracle.com, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Stat-Signature: yuiz5mtctbmj9odhxrr6gfajrfo9zeum X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: DE48240015 X-HE-Tag: 1768408344-553931 X-HE-Meta: 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 698R3Ldv 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 h0N+yr1a OjGjaJfmgbyUEhrKP5nIvurpFy6IYRWB0ysqzOFsRjNgzJ3tCvTcsJx/U3aJiiTyw2IgfzUZiJ94QGupUVMBJ4XDTW5/2w33a0cMxaJCuoZwAqv5uKPc637DSwi9paCnnvN8NfpF20Cb1Yvn19hEwxa0c/n2SMn4E+FAodmjH1znc7YPiWnVRoSRj3C58L0p7WoPbEBOD8h4gWrTOTyE3S0p4hC8ich0YfDBuAk79bOYoceVObG4n85abqSIwG7KzKMIAAgRTebH7aAg+JmbsaZ3f1OZztZfTwcSWxAMAR7JAXn7Ldut96WJ2xVTA6obbR4xMOYGlQzXPpl5BC3waY5STDRttSnB3ktjMdXpFhHG1P7Nh171I2k3AnDbbI9E+ZwQPxiebZPHAHtWw6nAyWsVBPTDPTBG6u7Z2UJOQ23R59r+v25gZIEX6bnAChse6syf3o+ryDe5KFmTr991Qi55qM5CED1G 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: Hello, syzbot found the following issue on: HEAD commit: cfd4039213e7 Merge tag 'io_uring-6.19-20251208' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1554d992580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c3201432211be40f dashboard link: https://syzkaller.appspot.com/bug?extid=f5d897f5194d92aa1769 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9f556ae6e3c4/disk-cfd40392.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/efcf53c1d459/vmlinux-cfd40392.xz kernel image: https://storage.googleapis.com/syzbot-assets/858f42961336/bzImage-cfd40392.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f5d897f5194d92aa1769@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare write to 0xffff88811c751e80 of 8 bytes by task 13471 on cpu 1: __anon_vma_prepare+0x172/0x2f0 mm/rmap.c:212 __vmf_anon_prepare+0x91/0x100 mm/memory.c:3673 hugetlb_no_page+0x1c4/0x10d0 mm/hugetlb.c:5782 hugetlb_fault+0x4cf/0xce0 mm/hugetlb.c:-1 handle_mm_fault+0x1894/0x2c60 mm/memory.c:6578 do_user_addr_fault+0x3fe/0x1080 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 fault_in_readable+0xad/0x170 mm/gup.c:-1 fault_in_iov_iter_readable+0x129/0x210 lib/iov_iter.c:106 generic_perform_write+0x3cf/0x490 mm/filemap.c:4363 shmem_file_write_iter+0xc5/0xf0 mm/shmem.c:3490 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x52a/0x960 fs/read_write.c:686 ksys_pwrite64 fs/read_write.c:793 [inline] __do_sys_pwrite64 fs/read_write.c:801 [inline] __se_sys_pwrite64 fs/read_write.c:798 [inline] __x64_sys_pwrite64+0xfd/0x150 fs/read_write.c:798 x64_sys_call+0x9f7/0x3000 arch/x86/include/generated/asm/syscalls_64.h:19 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811c751e80 of 8 bytes by task 13473 on cpu 0: __vmf_anon_prepare+0x26/0x100 mm/memory.c:3667 hugetlb_no_page+0x1c4/0x10d0 mm/hugetlb.c:5782 hugetlb_fault+0x4cf/0xce0 mm/hugetlb.c:-1 handle_mm_fault+0x1894/0x2c60 mm/memory.c:6578 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x1024/0x1ed0 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x243/0x3a0 mm/gup.c:1963 mm_populate include/linux/mm.h:3701 [inline] vm_mmap_pgoff+0x232/0x2e0 mm/util.c:586 ksys_mmap_pgoff+0x268/0x310 mm/mmap.c:604 x64_sys_call+0x16bb/0x3000 arch/x86/include/generated/asm/syscalls_64.h:10 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff888104ecca28 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 13473 Comm: syz.2.3219 Tainted: G W syzkaller #0 PREEMPT(voluntary) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup