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BUG: KCSAN: data-race in mtree_range_walk / rcu_segcblist_enqueue

write to 0xffff888133b2c308 of 8 bytes by task 20936 on cpu 0:
 rcu_segcblist_enqueue+0x67/0xa0 kernel/rcu/rcu_segcblist.c:345
 __call_rcu_common kernel/rcu/tree.c:2735 [inline]
 call_rcu+0x1ba/0x420 kernel/rcu/tree.c:2829
 ma_free_rcu lib/maple_tree.c:197 [inline]
 mas_free lib/maple_tree.c:1304 [inline]
 mas_replace_node+0x2f8/0x430 lib/maple_tree.c:1741
 mas_wr_node_store lib/maple_tree.c:3958 [inline]
 mas_wr_modify+0x2bc3/0x3c80 lib/maple_tree.c:4191
 mas_wr_store_entry+0x250/0x390 lib/maple_tree.c:4231
 mas_store_prealloc+0x151/0x2a0 lib/maple_tree.c:5437
 vma_iter_store mm/internal.h:1185 [inline]
 vma_complete+0x3a7/0x760 mm/mmap.c:532
 __split_vma+0x580/0x610 mm/mmap.c:2381
 split_vma mm/mmap.c:2407 [inline]
 vma_modify+0x152/0x240 mm/mmap.c:2442
 vma_modify_flags include/linux/mm.h:3283 [inline]
 mprotect_fixup+0x324/0x5c0 mm/mprotect.c:635
 do_mprotect_pkey+0x64c/0x930 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:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888133b2c308 of 8 bytes by task 20939 on cpu 1:
 mtree_range_walk+0x2a3/0x450 lib/maple_tree.c:2791
 mas_state_walk lib/maple_tree.c:3680 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4861
 lock_vma_under_rcu+0x84/0x290 mm/memory.c:5602
 do_user_addr_fault arch/x86/mm/fault.c:1356 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x165/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20939 Comm: syz-executor.2 Not tainted 6.8.0-rc3-syzkaller-00279-g4a7bbe7519b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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