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BUG: KCSAN: data-race in mas_state_walk / mast_fill_bnode

write to 0xffff888104ccf608 of 8 bytes by task 22759 on cpu 1:
 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+0x3f2/0x420 mm/mmap.c:2386
 do_vmi_align_munmap+0x270/0x770 mm/mmap.c:2482
 do_vmi_munmap+0x1ea/0x230 mm/mmap.c:2624
 mmap_region+0x53c/0x14d0 mm/mmap.c:2674
 do_mmap+0x69c/0xaa0 mm/mmap.c:1363
 vm_mmap_pgoff+0x12f/0x240 mm/util.c:543
 ksys_mmap_pgoff+0x2b8/0x330 mm/mmap.c:1409
 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 0xffff888104ccf608 of 8 bytes by task 22758 on cpu 0:
 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/0x2d0 mm/memory.c:5385
 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 -> 0xffff888104ccf31c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22758 Comm: syz-executor.4 Not tainted 6.5.0-rc7-syzkaller-00022-ga5e505a99ca7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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