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BUG: KCSAN: data-race in mas_state_walk / mas_wmb_replace

write to 0xffff88810508ce00 of 8 bytes by task 14389 on cpu 0:
 mte_set_node_dead lib/maple_tree.c:334 [inline]
 mas_topiary_node lib/maple_tree.c:2310 [inline]
 mas_topiary_replace lib/maple_tree.c:2416 [inline]
 mas_wmb_replace+0x13ce/0x1610 lib/maple_tree.c:2433
 mas_spanning_rebalance+0x2385/0x2ff0 lib/maple_tree.c:2738
 mas_wr_spanning_store+0x1af3/0x1ea0 lib/maple_tree.c:3479
 mas_wr_store_entry+0x1127/0x2ed0 lib/maple_tree.c:3767
 mas_store_prealloc+0x72e/0xa70 lib/maple_tree.c:5169
 vma_iter_store_overwrite mm/vma.h:607 [inline]
 commit_merge+0x6a1/0x720 mm/vma.c:763
 vma_merge_existing_range mm/vma.c:976 [inline]
 vma_modify+0x8f4/0xd00 mm/vma.c:1657
 vma_modify_flags+0x182/0x210 mm/vma.c:1700
 mprotect_fixup+0x312/0x5d0 mm/mprotect.c:756
 do_mprotect_pkey+0x67b/0x920 mm/mprotect.c:930
 __do_sys_mprotect mm/mprotect.c:951 [inline]
 __se_sys_mprotect mm/mprotect.c:948 [inline]
 __x64_sys_mprotect+0x48/0x60 mm/mprotect.c:948
 x64_sys_call+0x2768/0x3020 arch/x86/include/generated/asm/syscalls_64.h:11
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88810508ce00 of 8 bytes by task 14392 on cpu 1:
 ma_dead_node lib/maple_tree.c:572 [inline]
 mtree_range_walk lib/maple_tree.c:2580 [inline]
 mas_state_walk+0x485/0x650 lib/maple_tree.c:3298
 mas_walk+0x60/0x150 lib/maple_tree.c:4599
 lock_vma_under_rcu+0xc9/0x210 mm/mmap_lock.c:304
 do_user_addr_fault+0x232/0x1050 arch/x86/mm/fault.c:1325
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x62/0xa0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

value changed: 0xffff88810508c20e -> 0xffff88810508ce00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 14392 Comm: syz.8.3227 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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