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BUG: KCSAN: data-race in mas_state_walk / mas_wr_modify

write to 0xffff888103aaa250 of 8 bytes by task 3638 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:4028 [inline]
 mas_wr_modify+0x1600/0x37d0 lib/maple_tree.c:4226
 mas_wr_store_entry+0x235/0x350 lib/maple_tree.c:4269
 mas_store_prealloc+0x155/0x2b0 lib/maple_tree.c:5460
 vma_iter_store+0xcb/0xe0 mm/internal.h:1198
 vma_merge+0xc0f/0x12c0 mm/mmap.c:1028
 vma_modify+0xb0/0x240 mm/mmap.c:2465
 vma_modify_flags include/linux/mm.h:3271 [inline]
 mprotect_fixup+0x324/0x5c0 mm/mprotect.c:635
 do_mprotect_pkey+0x641/0x920 mm/mprotect.c:809
 __do_sys_mprotect mm/mprotect.c:830 [inline]
 __se_sys_mprotect mm/mprotect.c:827 [inline]
 __x64_sys_mprotect+0x48/0x50 mm/mprotect.c:827
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888103aaa250 of 8 bytes by task 3676 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2817 [inline]
 mas_state_walk+0x328/0x5d0 lib/maple_tree.c:3712
 mas_walk+0x31/0x120 lib/maple_tree.c:4888
 lock_vma_under_rcu+0x8d/0x2a0 mm/memory.c:5496
 do_user_addr_fault arch/x86/mm/fault.c:1356 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x164/0x6c0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

value changed: 0x00007f1157706fff -> 0x00007f11576e6fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3676 Comm: syz-executor.4 Tainted: G        W          6.7.0-rc2-syzkaller-00014-gc2d5304e6c64 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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