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Fri, 17 Apr 2026 02:12:21 -0700 (PDT) Date: Fri, 17 Apr 2026 02:12:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e1f975.050a0220.1de265.0009.GAE@google.com> Subject: [syzbot] [mm?] KCSAN: data-race in mas_wr_store_entry / mtree_range_walk (2) From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: BCBCD180002 X-Stat-Signature: sbxhnfigjtnm8u6sbx54bpwchsbu1khz X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1776417142-704605 X-HE-Meta: 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 Bl6Bnq3W 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 p1UVrJwa 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 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: 1d51b370a0f8 Merge tag 'jfs-7.1' of github.com:kleikamp/li.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=117dc4ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f207c4b1fbf85a3 dashboard link: https://syzkaller.appspot.com/bug?extid=38a879f4a73497f2dfef compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e08ff8d2b0e5/disk-1d51b370.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c11d4b098bbf/vmlinux-1d51b370.xz kernel image: https://storage.googleapis.com/syzbot-assets/6a4691f32e3d/bzImage-1d51b370.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+38a879f4a73497f2dfef@syzkaller.appspotmail.com ================================================================== BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk write to 0xffff888104f71d08 of 8 bytes by task 4757 on cpu 0: mas_wr_slot_store lib/maple_tree.c:3232 [inline] mas_wr_store_entry+0x3405/0x5ad0 lib/maple_tree.c:3528 mas_store_prealloc+0x43e/0x690 lib/maple_tree.c:4936 vma_iter_store_overwrite mm/vma.h:616 [inline] commit_merge+0x6a1/0x720 mm/vma.c:766 vma_expand+0x301/0x460 mm/vma.c:1219 vma_merge_new_range+0x29c/0x320 mm/vma.c:1112 __mmap_region mm/vma.c:2766 [inline] mmap_region+0x1073/0x2110 mm/vma.c:2856 do_mmap+0x9b2/0xbd0 mm/mmap.c:560 vm_mmap_pgoff+0x183/0x2d0 mm/util.c:581 ksys_mmap_pgoff+0xc1/0x310 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+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888104f71d08 of 8 bytes by task 4759 on cpu 1: mtree_range_walk+0x1a6/0x490 lib/maple_tree.c:2032 mas_state_walk lib/maple_tree.c:2952 [inline] mas_walk+0x1cc/0x370 lib/maple_tree.c:4366 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:304 do_user_addr_fault+0x232/0x1050 arch/x86/mm/fault.c:1325 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 value changed: 0x00007f68dc2a5fff -> 0x00007f68dc284fff Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 4759 Comm: syz.5.348 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 ================================================================== netlink: 64 bytes leftover after parsing attributes in process `syz.5.348'. --- 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