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BUG: KCSAN: data-race in mas_state_walk / mas_wr_store_entry

write to 0xffff8881135cf178 of 8 bytes by task 19504 on cpu 1:
 mas_wr_slot_store lib/maple_tree.c:3925 [inline]
 mas_wr_store_entry+0x1581/0x2b50 lib/maple_tree.c:4101
 mas_store_prealloc+0x74d/0x9e0 lib/maple_tree.c:5510
 vma_iter_store_overwrite mm/vma.h:501 [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+0x274e/0x2ff0 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 0xffff8881135cf178 of 8 bytes by task 19506 on cpu 0:
 mtree_range_walk lib/maple_tree.c:2787 [inline]
 mas_state_walk+0x2f5/0x650 lib/maple_tree.c:3636
 mas_walk+0x60/0x150 lib/maple_tree.c:4939
 lock_vma_under_rcu+0x8d/0x160 mm/mmap_lock.c:143
 do_user_addr_fault+0x233/0x1090 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:623

value changed: 0x00007f9b3d7c4fff -> 0x00007f9b3d7a4fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 19506 Comm: syz.7.5775 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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