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BUG: KCSAN: data-race in call_rcu / mtree_range_walk

write to 0xffff8881191c1808 of 8 bytes by task 28148 on cpu 1:
 __call_rcu_common kernel/rcu/tree.c:3085 [inline]
 call_rcu+0x47/0x430 kernel/rcu/tree.c:3190
 ma_free_rcu lib/maple_tree.c:211 [inline]
 mas_topiary_node lib/maple_tree.c:2534 [inline]
 mas_topiary_replace lib/maple_tree.c:2634 [inline]
 mas_wmb_replace+0xcc0/0x14d0 lib/maple_tree.c:2656
 mas_split lib/maple_tree.c:3383 [inline]
 mas_commit_b_node lib/maple_tree.c:3403 [inline]
 mas_wr_bnode lib/maple_tree.c:4064 [inline]
 mas_wr_store_entry+0x1681/0x2d10 lib/maple_tree.c:4105
 mas_store_prealloc+0x6bf/0x960 lib/maple_tree.c:5519
 vma_iter_store mm/vma.h:387 [inline]
 __mmap_new_vma mm/vma.c:2371 [inline]
 __mmap_region+0xdca/0x13f0 mm/vma.c:2456
 mmap_region+0x164/0x1e0 mm/mmap.c:1347
 do_mmap+0x718/0xb60 mm/mmap.c:496
 vm_mmap_pgoff+0x133/0x290 mm/util.c:580
 ksys_mmap_pgoff+0xd0/0x330 mm/mmap.c:542
 x64_sys_call+0x1940/0x2dc0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881191c1808 of 8 bytes by task 28147 on cpu 0:
 mtree_range_walk+0x140/0x460 lib/maple_tree.c:2784
 mas_state_walk lib/maple_tree.c:3620 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4946
 lock_vma_under_rcu+0x95/0x260 mm/memory.c:6274
 do_user_addr_fault arch/x86/mm/fault.c:1329 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x150/0x650 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007f6aff226fff -> 0xffff8881191c1108

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 28147 Comm: syz.3.9160 Not tainted 6.12.0-syzkaller-10689-g7af08b57bcb9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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