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Fri, 19 Jun 2026 19:36:32 -0700 (PDT) Date: Fri, 19 Jun 2026 19:36:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a35fcb0.6813c476.3c3d96.0003.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare (2) From: syzbot To: akpm@linux-foundation.org, david@kernel.org, harry@kernel.org, jannh@google.com, liam@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, riel@surriel.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 23452140003 X-Stat-Signature: kh5t3ku7gw3hyfgayffx3jjmdp7mkufg X-HE-Tag: 1781922992-520455 X-HE-Meta: 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 haOfx1JM 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 o+M9Ax8X rWRhVWR0Z6IyARxLR+lYWbBEJbz0Qp1Hc6l9xueE5U3e+jGHY4vp9JmyK54sWpYN66O4ABIhJFHd4sIBuU+x8KaAXHzJJ+2eSVm0Atziv/DxH+tPPjURDBMnhLRU3JRC4ln1OqUX8CFKPgR16Y6D6jZeYJFwSFE1rlAtWVuLGBXF1zC7fIjnV+w9nAm1B01xoX4/j9kLXw6ip46+ul5nmCxfKRRnhfBVOuljiEkZdy3o+B04ga7rW9OYHIi7Ymq54V1CNzlJmW6Ga3Bt8elVA3rE2fcg+VY+N9yuWwepFTG7rw39j3uZMfRtKN9F/yWRqfoHE/IRQTaH1podScZiRbeixDXGWmX8dfYhxpMDudKSHqP4Y2XvgNrzPcuT3DS+SHDOeaLuPiXmJXBDIIf9Wju8d8svF1ODNA88H8rsm8mf9K9HjDMxGDDaAkxF8GPn2i1iiFA9Byw= 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: 5e2e14749c3d Merge tag 'landlock-7.2-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10e5ccfe580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0ae27ce66b92956 dashboard link: https://syzkaller.appspot.com/bug?extid=395b7abe9696862fc188 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a565c60a4762/disk-5e2e1474.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e593a6eb0057/vmlinux-5e2e1474.xz kernel image: https://storage.googleapis.com/syzbot-assets/d24b55020ea3/bzImage-5e2e1474.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+395b7abe9696862fc188@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in __anon_vma_prepare / __vmf_anon_prepare write to 0xffff88811a6a4d00 of 8 bytes by task 20911 on cpu 1: __anon_vma_prepare+0x172/0x2f0 mm/rmap.c:212 __vmf_anon_prepare+0x91/0x100 mm/memory.c:3829 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0x129c/0x1f10 mm/gup.c:1428 populate_vma_page_range mm/gup.c:1860 [inline] __mm_populate+0x242/0x390 mm/gup.c:1963 mm_populate include/linux/mm.h:4171 [inline] vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586 ksys_mmap_pgoff+0x2c6/0x310 mm/mmap.c:606 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88811a6a4d00 of 8 bytes by task 20901 on cpu 0: __vmf_anon_prepare+0x26/0x100 mm/memory.c:3823 hugetlb_no_page+0x1b8/0xf30 mm/hugetlb.c:5756 hugetlb_fault+0x608/0xda0 mm/hugetlb.c:-1 handle_mm_fault+0x1de9/0x2da0 mm/memory.c:6684 do_user_addr_fault+0x402/0x1060 arch/x86/mm/fault.c:1394 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 __put_user_nocheck_4+0x3/0x20 arch/x86/lib/putuser.S:97 ____sys_recvmsg+0x1a1/0x280 net/socket.c:2917 ___sys_recvmsg+0x11f/0x3a0 net/socket.c:2946 do_recvmmsg+0x1e5/0x560 net/socket.c:3041 __sys_recvmmsg net/socket.c:3115 [inline] __do_sys_recvmmsg net/socket.c:3138 [inline] __se_sys_recvmmsg net/socket.c:3131 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3131 x64_sys_call+0x80f/0x3020 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x0000000000000000 -> 0xffff8881020cec60 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 20901 Comm: syz.0.4316 Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 ================================================================== --- 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