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BUG: KCSAN: data-race in call_rcu / mas_state_walk

write to 0xffff888107b3c408 of 8 bytes by task 23236 on cpu 0:
 __call_rcu_common kernel/rcu/tree.c:2680 [inline]
 call_rcu+0x49/0x410 kernel/rcu/tree.c:2795
 ma_free_rcu lib/maple_tree.c:190 [inline]
 mas_topiary_node lib/maple_tree.c:2556 [inline]
 mas_topiary_replace lib/maple_tree.c:2662 [inline]
 mas_wmb_replace+0xf63/0x14a0 lib/maple_tree.c:2678
 mas_split lib/maple_tree.c:3429 [inline]
 mas_commit_b_node lib/maple_tree.c:3482 [inline]
 mas_wr_bnode lib/maple_tree.c:4198 [inline]
 mas_wr_modify+0x17c6/0x37d0 lib/maple_tree.c:4236
 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
 mmap_region+0xff9/0x16e0 mm/mmap.c:2922
 do_mmap+0x67e/0xa90 mm/mmap.c:1379
 vm_mmap_pgoff+0x12e/0x240 mm/util.c:556
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1425
 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 0xffff888107b3c408 of 8 bytes by task 23238 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2808 [inline]
 mas_state_walk+0x28b/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: 0x000000001fffefff -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23238 Comm: syz-executor.2 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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