syzbot

==================================================================
BUG: KCSAN: data-race in mas_state_walk / mas_wr_store_entry

write to 0xffff8881047e7028 of 8 bytes by task 6002 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3583 [inline]
 mas_wr_store_entry+0x1192/0x26e0 lib/maple_tree.c:3759
 mas_store_prealloc+0x74d/0xa80 lib/maple_tree.c:5167
 vma_iter_store_overwrite mm/vma.h:481 [inline]
 commit_merge+0x6a5/0x730 mm/vma.c:765
 vma_expand+0x220/0x320 mm/vma.c:1158
 vma_merge_new_range+0x296/0x310 mm/vma.c:1095
 __mmap_region mm/vma.c:2665 [inline]
 mmap_region+0xa50/0x1620 mm/vma.c:2740
 do_mmap+0x9b3/0xbe0 mm/mmap.c:558
 vm_mmap_pgoff+0x17a/0x2e0 mm/util.c:581
 ksys_mmap_pgoff+0xc2/0x310 mm/mmap.c:604
 x64_sys_call+0x14a3/0x3000 arch/x86/include/generated/asm/syscalls_64.h:10
 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 0xffff8881047e7028 of 8 bytes by task 6003 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2567 [inline]
 mas_state_walk+0x2f5/0x650 lib/maple_tree.c:3296
 mas_walk+0x60/0x150 lib/maple_tree.c:4597
 lock_vma_under_rcu+0x95/0x170 mm/mmap_lock.c:232
 do_user_addr_fault+0x233/0x1080 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: 0x00007f600dd66fff -> 0x00007f600dd45fff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6003 Comm: syz.4.931 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
==================================================================