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BUG: KCSAN: data-race in mas_wmb_replace / mtree_range_walk

write to 0xffff888103933600 of 8 bytes by task 4395 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:299 [inline]
 mas_topiary_node lib/maple_tree.c:1792 [inline]
 mas_topiary_replace lib/maple_tree.c:1898 [inline]
 mas_wmb_replace+0x1512/0x1770 lib/maple_tree.c:2083
 mas_wr_store_entry+0x54a7/0x5a90 lib/maple_tree.c:-1
 mas_store_prealloc+0x421/0x670 lib/maple_tree.c:4936
 vma_iter_store_overwrite mm/vma.h:616 [inline]
 vma_iter_store_new mm/vma.h:623 [inline]
 vma_complete+0x3c7/0x850 mm/vma.c:359
 __split_vma+0x592/0x640 mm/vma.c:569
 vms_gather_munmap_vmas+0x176/0x7f0 mm/vma.c:1427
 do_vmi_align_munmap+0x1e1/0x400 mm/vma.c:1595
 do_vmi_munmap+0x1da/0x220 mm/vma.c:1652
 __vm_munmap+0x192/0x270 mm/vma.c:3288
 __do_sys_munmap mm/mmap.c:1079 [inline]
 __se_sys_munmap mm/mmap.c:1076 [inline]
 __x64_sys_munmap+0x36/0x50 mm/mmap.c:1076
 x64_sys_call+0x9c0/0x3020 arch/x86/include/generated/asm/syscalls_64.h:12
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888103933600 of 8 bytes by task 4396 on cpu 1:
 ma_dead_node lib/maple_tree.c:544 [inline]
 mtree_range_walk+0x35a/0x480 lib/maple_tree.c:2051
 mas_state_walk lib/maple_tree.c:2952 [inline]
 mas_walk+0x1ac/0x340 lib/maple_tree.c:4366
 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:304
 do_user_addr_fault+0x237/0x1060 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: 0xffff888109d3520e -> 0xffff888103933600

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 4396 Comm: syz.2.206 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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