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BUG: KCSAN: data-race in mas_state_walk / mas_wmb_replace

write to 0xffff8881014de500 of 8 bytes by task 11521 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:334 [inline]
 mas_put_in_tree lib/maple_tree.c:1565 [inline]
 mas_topiary_replace lib/maple_tree.c:2341 [inline]
 mas_wmb_replace+0x208/0xfa0 lib/maple_tree.c:2433
 mas_split lib/maple_tree.c:3052 [inline]
 mas_commit_b_node lib/maple_tree.c:3072 [inline]
 mas_wr_bnode lib/maple_tree.c:3739 [inline]
 mas_wr_store_entry+0x13e3/0x2750 lib/maple_tree.c:3771
 mas_store_prealloc+0x760/0xa90 lib/maple_tree.c:5169
 vma_iter_store_overwrite mm/vma.h:481 [inline]
 vma_iter_store_new+0x1c5/0x200 mm/vma.h:488
 __mmap_new_vma mm/vma.c:2497 [inline]
 __mmap_region mm/vma.c:2670 [inline]
 mmap_region+0x10e3/0x15f0 mm/vma.c:2740
 do_mmap+0x9b3/0xbe0 mm/mmap.c:558
 vm_mmap_pgoff+0x17a/0x2e0 mm/util.c:581
 ksys_mmap_pgoff+0xc2/0x310 mm/mmap.c:604
 x64_sys_call+0x16bb/0x3000 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd8/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881014de500 of 8 bytes by task 11522 on cpu 1:
 ma_dead_node lib/maple_tree.c:572 [inline]
 mte_dead_node lib/maple_tree.c:587 [inline]
 mas_start lib/maple_tree.c:1207 [inline]
 mas_state_walk+0x119/0x650 lib/maple_tree.c:3291
 mas_walk+0x60/0x150 lib/maple_tree.c:4599
 lock_vma_under_rcu+0x95/0x1b0 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: 0xffff888104400dc1 -> 0xffff8881014de500

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 11522 Comm: syz.2.2898 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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