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BUG: KCSAN: data-race in mas_state_walk / mas_wmb_replace

write to 0xffff888113ba5200 of 8 bytes by task 18140 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:332 [inline]
 mas_topiary_node lib/maple_tree.c:2308 [inline]
 mas_topiary_replace lib/maple_tree.c:2414 [inline]
 mas_wmb_replace+0xd74/0xfa0 lib/maple_tree.c:2431
 mas_spanning_rebalance+0x262a/0x2c60 lib/maple_tree.c:2736
 mas_wr_spanning_store+0x1646/0x1960 lib/maple_tree.c:3477
 mas_wr_store_entry+0xd4d/0x26e0 lib/maple_tree.c:3765
 mas_store_prealloc+0x74d/0xa80 lib/maple_tree.c:5167
 vma_iter_store_overwrite mm/vma.h:481 [inline]
 commit_merge+0x6a5/0x730 mm/vma.c:765
 vma_merge_existing_range mm/vma.c:973 [inline]
 vma_modify+0xad7/0xc80 mm/vma.c:1608
 vma_modify_flags+0x101/0x130 mm/vma.c:1649
 mprotect_fixup+0x2cc/0x570 mm/mprotect.c:816
 do_mprotect_pkey+0x6d6/0x980 mm/mprotect.c:990
 __do_sys_mprotect mm/mprotect.c:1011 [inline]
 __se_sys_mprotect mm/mprotect.c:1008 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:1008
 x64_sys_call+0x2752/0x3000 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888113ba5200 of 8 bytes by task 18141 on cpu 1:
 ma_dead_node lib/maple_tree.c:570 [inline]
 mtree_range_walk lib/maple_tree.c:2578 [inline]
 mas_state_walk+0x485/0x650 lib/maple_tree.c:3296
 mas_walk+0x60/0x150 lib/maple_tree.c:4597
 lock_vma_under_rcu+0x95/0x170 mm/mmap_lock.c:232
 do_user_addr_fault+0x233/0x1080 arch/x86/mm/fault.c:1327
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

value changed: 0xffff8881045ec90e -> 0xffff888113ba5200

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18141 Comm: syz.7.3552 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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