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BUG: KCSAN: data-race in call_rcu / mtree_range_walk

write to 0xffff888103372b10 of 8 bytes by task 8774 on cpu 1:
 __call_rcu_common kernel/rcu/tree.c:3084 [inline]
 call_rcu+0x3b/0x430 kernel/rcu/tree.c:3190
 ma_free_rcu lib/maple_tree.c:197 [inline]
 mas_topiary_node lib/maple_tree.c:2523 [inline]
 mas_topiary_replace lib/maple_tree.c:2623 [inline]
 mas_wmb_replace+0xcb3/0x14d0 lib/maple_tree.c:2645
 mas_split lib/maple_tree.c:3375 [inline]
 mas_commit_b_node lib/maple_tree.c:3395 [inline]
 mas_wr_bnode lib/maple_tree.c:4044 [inline]
 mas_wr_store_entry+0x163c/0x2d00 lib/maple_tree.c:4085
 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5520
 vma_iter_store+0x168/0x190 mm/vma.h:476
 __mmap_region mm/mmap.c:1513 [inline]
 mmap_region+0x11ac/0x14a0 mm/mmap.c:1603
 do_mmap+0x718/0xb60 mm/mmap.c:496
 vm_mmap_pgoff+0x133/0x290 mm/util.c:588
 ksys_mmap_pgoff+0xd0/0x330 mm/mmap.c:542
 x64_sys_call+0x1940/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888103372b10 of 8 bytes by task 8775 on cpu 0:
 mtree_range_walk+0x1b4/0x460 lib/maple_tree.c:2781
 mas_state_walk lib/maple_tree.c:3601 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4948
 lock_vma_under_rcu+0x95/0x260 mm/memory.c:6239
 do_user_addr_fault arch/x86/mm/fault.c:1329 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x150/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007feefa589fff -> 0xffffffff852e8690

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 8775 Comm: syz.1.1858 Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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