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BUG: KCSAN: data-race in mas_state_walk / mast_fill_bnode

write to 0xffff888103b14108 of 8 bytes by task 22132 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: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+0xcb/0xe0 mm/internal.h:1073
 mmap_region+0xe64/0x14c0 mm/mmap.c:2824
 do_mmap+0x69c/0xaa0 mm/mmap.c:1373
 vm_mmap_pgoff+0x12f/0x240 mm/util.c:543
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1419
 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 0xffff888103b14108 of 8 bytes by task 22137 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2957 [inline]
 mas_state_walk+0x28b/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: 0x000000001fffefff -> 0xffff888136031f08

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22137 Comm: syz-executor.0 Not tainted 6.4.0-syzkaller-09775-gd85a143b69ab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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