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BUG: KCSAN: data-race in call_rcu / mtree_range_walk

write to 0xffff88811490ac10 of 8 bytes by task 12893 on cpu 0:
 __call_rcu_common kernel/rcu/tree.c:3080 [inline]
 call_rcu+0x3d/0x430 kernel/rcu/tree.c:3202
 ma_free_rcu lib/maple_tree.c:211 [inline]
 mas_free lib/maple_tree.c:1313 [inline]
 mas_replace_node+0x2fd/0x430 lib/maple_tree.c:1750
 mas_wr_node_store lib/maple_tree.c:3863 [inline]
 mas_wr_store_entry+0x1e80/0x2460 lib/maple_tree.c:4083
 mas_store_prealloc+0x6d5/0x960 lib/maple_tree.c:5475
 vma_iter_store_overwrite mm/vma.h:441 [inline]
 vma_iter_store_new+0x1d3/0x210 mm/vma.h:448
 __mmap_new_vma mm/vma.c:2390 [inline]
 __mmap_region mm/vma.c:2476 [inline]
 mmap_region+0xe0c/0x1490 mm/vma.c:2554
 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+0xc9/0x1c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811490ac10 of 8 bytes by task 12894 on cpu 1:
 mtree_range_walk+0x2a7/0x460 lib/maple_tree.c:2784
 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: 0x00007f3cc97f6fff -> 0xffffffff85628830

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 12894 Comm: syz.5.2728 Not tainted 6.15.0-rc1-syzkaller-00065-g3b07108ada81 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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