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BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk

write to 0xffff88811b963308 of 8 bytes by task 12465 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3307 [inline]
 mas_wr_store_entry+0x3370/0x5ac0 lib/maple_tree.c:3603
 mas_store_prealloc+0x421/0x670 lib/maple_tree.c:5031
 vma_iter_store_overwrite mm/vma.h:704 [inline]
 commit_merge+0x7b4/0x840 mm/vma.c:847
 vma_expand+0x2d4/0x440 mm/vma.c:1302
 vma_merge_new_range+0x285/0x2f0 mm/vma.c:1195
 __mmap_region mm/vma.c:2876 [inline]
 mmap_region+0x10f4/0x21e0 mm/vma.c:2966
 do_mmap+0xa20/0xc70 mm/mmap.c:573
 vm_mmap_pgoff+0x183/0x2d0 mm/util.c:581
 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:619
 x64_sys_call+0x23b3/0x2550 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88811b963308 of 8 bytes by task 12468 on cpu 1:
 mtree_range_walk+0x1aa/0x480 lib/maple_tree.c:2100
 mas_state_walk lib/maple_tree.c:3013 [inline]
 mas_walk+0x1ac/0x340 lib/maple_tree.c:4458
 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:304
 do_user_addr_fault+0x239/0x1060 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: 0x00007f3cba1f4fff -> 0x00007f3cba1d3fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 12468 Comm: syz.9.2249 Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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