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BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk

write to 0xffff88810fb7d010 of 8 bytes by task 25115 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3895 [inline]
 mas_wr_store_entry+0x1266/0x2460 lib/maple_tree.c:4080
 mas_store_prealloc+0x6d5/0x960 lib/maple_tree.c:5475
 vma_iter_store_overwrite mm/vma.h:448 [inline]
 commit_merge+0x685/0x710 mm/vma.c:709
 vma_expand+0x1d9/0x380 mm/vma.c:1114
 vma_merge_new_range+0x2c2/0x340 mm/vma.c:1052
 __mmap_region mm/vma.c:2514 [inline]
 mmap_region+0x805/0x1490 mm/vma.c:2597
 do_mmap+0x9ef/0xc80 mm/mmap.c:561
 vm_mmap_pgoff+0x16d/0x2d0 mm/util.c:579
 ksys_mmap_pgoff+0xd0/0x340 mm/mmap.c:607
 x64_sys_call+0x1945/0x2e10 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc9/0x1a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810fb7d010 of 8 bytes by task 25118 on cpu 1:
 mtree_range_walk+0x1b3/0x460 lib/maple_tree.c:2777
 mas_state_walk lib/maple_tree.c:3605 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4905
 lock_vma_under_rcu+0xa7/0x340 mm/memory.c:6553
 do_user_addr_fault arch/x86/mm/fault.c:1328 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x150/0x6a0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007f7498fe5fff -> 0xffffffff8561e830

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 25118 Comm: syz.7.6670 Tainted: G        W           6.15.0-rc2-syzkaller-00400-g3088d26962e8 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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