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BUG: KCSAN: data-race in mas_state_walk / mast_fill_bnode

write to 0xffff88812fd57f08 of 8 bytes by task 5353 on cpu 0:
 mat_add lib/maple_tree.c:995 [inline]
 mast_fill_bnode+0x132/0xeb0 lib/maple_tree.c:3373
 mas_split lib/maple_tree.c:3579 [inline]
 mas_commit_b_node lib/maple_tree.c:3638 [inline]
 mas_wr_bnode lib/maple_tree.c:4316 [inline]
 mas_wr_modify+0x134c/0x3590 lib/maple_tree.c:4354
 mas_wr_store_entry+0x668/0x810 lib/maple_tree.c:4391
 mas_store_prealloc+0xe9/0x250 lib/maple_tree.c:5530
 vma_iter_store mm/internal.h:1073 [inline]
 vma_complete+0x2b7/0x660 mm/mmap.c:553
 __split_vma+0x3ae/0x420 mm/mmap.c:2385
 split_vma+0x73/0x90 mm/mmap.c:2413
 mprotect_fixup+0x52a/0x650 mm/mprotect.c:643
 do_mprotect_pkey+0x641/0x920 mm/mprotect.c:817
 __do_sys_mprotect mm/mprotect.c:838 [inline]
 __se_sys_mprotect mm/mprotect.c:835 [inline]
 __x64_sys_mprotect+0x48/0x50 mm/mprotect.c:835
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88812fd57f08 of 8 bytes by task 5372 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2957 [inline]
 mas_state_walk+0x28b/0x5d0 lib/maple_tree.c:3869
 mas_walk+0x7e/0x160 lib/maple_tree.c:4981
 lock_vma_under_rcu+0x8d/0x2b0 mm/memory.c:5388
 do_user_addr_fault arch/x86/mm/fault.c:1335 [inline]
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x160/0x650 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x000000001fffefff -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 5372 Comm: syz-executor.0 Not tainted 6.5.0-rc2-syzkaller-00052-gbfa3037d8280 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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