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BUG: KCSAN: data-race in mas_wmb_replace / mtree_range_walk

write to 0xffff888108fd0500 of 8 bytes by task 19417 on cpu 1:
 mte_set_node_dead lib/maple_tree.c:305 [inline]
 mas_put_in_tree lib/maple_tree.c:1615 [inline]
 mas_topiary_replace lib/maple_tree.c:1859 [inline]
 mas_wmb_replace+0x242/0x1870 lib/maple_tree.c:2114
 mas_wr_store_entry+0x54d7/0x5ac0 lib/maple_tree.c:-1
 mas_store_prealloc+0x421/0x670 lib/maple_tree.c:4990
 vma_iter_store_overwrite mm/vma.h:737 [inline]
 vma_iter_store_new mm/vma.h:744 [inline]
 vma_complete+0x3ba/0x860 mm/vma.c:384
 __split_vma+0x75f/0x7c0 mm/vma.c:596
 split_vma mm/vma.c:626 [inline]
 vma_modify+0x36d/0x1220 mm/vma.c:1772
 vma_modify_flags+0x1be/0x250 mm/vma.c:1792
 mprotect_fixup+0x42c/0x710 mm/mprotect.c:823
 do_mprotect_pkey+0x69f/0x990 mm/mprotect.c:1001
 __do_sys_mprotect mm/mprotect.c:1022 [inline]
 __se_sys_mprotect mm/mprotect.c:1019 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:1019
 x64_sys_call+0xd54/0x2550 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888108fd0500 of 8 bytes by task 19420 on cpu 0:
 ma_dead_node lib/maple_tree.c:505 [inline]
 mtree_range_walk+0x35a/0x480 lib/maple_tree.c:2082
 mas_state_walk lib/maple_tree.c:2976 [inline]
 mas_walk+0x1ac/0x340 lib/maple_tree.c:4421
 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:331
 do_user_addr_fault+0x23a/0xde0 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595

value changed: 0xffff888117365ec1 -> 0xffff888108fd0500

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 19420 Comm: syz.6.3387 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
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