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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. ... and you won't. This will work unless we tear aligned unsigned long writes/reads. I'm debating marking these as data_race(). Marking them all as READ_ONCE and this one write as WRITE_ONCE. It seems overkill for something that won't happen. Alternatively, I can move the slot store fast path to need an allocation, but that's worse. > > 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