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BUG: KCSAN: data-race in mas_state_walk / mas_wr_store_entry

write to 0xffff888104867b08 of 8 bytes by task 14189 on cpu 1:
 mas_wr_slot_store lib/maple_tree.c:3585 [inline]
 mas_wr_store_entry+0x140a/0x2990 lib/maple_tree.c:3761
 mas_store_prealloc+0x72e/0xa60 lib/maple_tree.c:5169
 vma_iter_store_overwrite mm/vma.h:544 [inline]
 commit_merge+0x6a1/0x720 mm/vma.c:761
 vma_expand+0x321/0x540 mm/vma.c:1198
 vma_merge_new_range+0x29c/0x320 mm/vma.c:1097
 __mmap_region mm/vma.c:2740 [inline]
 mmap_region+0xf04/0x1a00 mm/vma.c:2823
 do_mmap+0x9b2/0xbd0 mm/mmap.c:558
 vm_mmap_pgoff+0x183/0x2d0 mm/util.c:581
 ksys_mmap_pgoff+0xc1/0x310 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+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888104867b08 of 8 bytes by task 14192 on cpu 0:
 mtree_range_walk lib/maple_tree.c:2561 [inline]
 mas_state_walk+0x28f/0x650 lib/maple_tree.c:3298
 mas_walk+0x60/0x150 lib/maple_tree.c:4599
 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:253
 do_user_addr_fault+0x232/0x1050 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: 0x00007fd24ccb4fff -> 0x00007fd24cc93fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14192 Comm: syz.4.3508 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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