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BUG: KCSAN: data-race in mas_state_walk / mast_fill_bnode

write to 0xffff88815f2e9e00 of 8 bytes by task 31418 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:303 [inline]
 mat_add lib/maple_tree.c:994 [inline]
 mast_fill_bnode+0x126/0xeb0 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:4315 [inline]
 mas_wr_modify+0x134c/0x3590 lib/maple_tree.c:4353
 mas_wr_store_entry+0x668/0x810 lib/maple_tree.c:4390
 mas_store_prealloc+0xe9/0x250 lib/maple_tree.c:5529
 vma_iter_store mm/internal.h:1073 [inline]
 vma_complete+0x2b7/0x660 mm/mmap.c:553
 __split_vma+0x3ae/0x420 mm/mmap.c:2381
 split_vma+0x73/0x90 mm/mmap.c:2409
 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 0xffff88815f2e9e00 of 8 bytes by task 31451 on cpu 1:
 ma_dead_node lib/maple_tree.c:538 [inline]
 mtree_range_walk lib/maple_tree.c:2977 [inline]
 mas_state_walk+0x43d/0x5d0 lib/maple_tree.c:3868
 mas_walk+0x7e/0x160 lib/maple_tree.c:4980
 lock_vma_under_rcu+0x8d/0x2b0 mm/memory.c:5381
 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: 0xffff888144d63206 -> 0xffff88815f2e9e00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 31451 Comm: syz-executor.2 Tainted: G        W          6.4.0-syzkaller-12415-g8fc3b8f082cc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
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