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BUG: KCSAN: data-race in mas_state_walk / mast_fill_bnode

write to 0xffff888103653408 of 8 bytes by task 3042 on cpu 0:
 mat_add lib/maple_tree.c:1005 [inline]
 mast_fill_bnode+0x132/0xeb0 lib/maple_tree.c:3374
 mas_push_data+0xf40/0x1060 lib/maple_tree.c:3495
 mas_split lib/maple_tree.c:3570 [inline]
 mas_commit_b_node lib/maple_tree.c:3639 [inline]
 mas_wr_bnode lib/maple_tree.c:4358 [inline]
 mas_wr_modify+0x17bd/0x39e0 lib/maple_tree.c:4401
 mas_wr_store_entry+0x701/0x840 lib/maple_tree.c:4439
 mas_store_prealloc+0xe9/0x250 lib/maple_tree.c:5764
 vma_iter_store+0xcb/0xe0 mm/internal.h:1070
 mmap_region+0xcd2/0x1490 mm/mmap.c:2717
 do_mmap+0x67c/0xaa0 mm/mmap.c:1394
 vm_mmap_pgoff+0x12f/0x240 mm/util.c:543
 ksys_mmap_pgoff+0x2ac/0x320 mm/mmap.c:1440
 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 0xffff888103653408 of 8 bytes by task 3036 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2958 [inline]
 mas_state_walk+0x28b/0x5d0 lib/maple_tree.c:3881
 mas_walk+0x1f/0xd0 lib/maple_tree.c:5109
 lock_vma_under_rcu+0x89/0x290 mm/memory.c:5279
 do_user_addr_fault arch/x86/mm/fault.c:1341 [inline]
 handle_page_fault arch/x86/mm/fault.c:1534 [inline]
 exc_page_fault+0x16e/0x780 arch/x86/mm/fault.c:1590
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x00000000003fffff -> 0xffff888104a57708

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3036 Comm: syz-fuzzer Not tainted 6.4.0-rc2-syzkaller-00163-g2d1bcbc6cd70 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
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