syzbot

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BUG: KCSAN: data-race in call_rcu / mas_state_walk

write to 0xffff8881039de310 of 8 bytes by task 3103 on cpu 0:
 __call_rcu_common kernel/rcu/tree.c:2679 [inline]
 call_rcu+0x3c/0x410 kernel/rcu/tree.c:2795
 ma_free_rcu lib/maple_tree.c:190 [inline]
 mas_free lib/maple_tree.c:1327 [inline]
 mas_replace_node+0x2f8/0x430 lib/maple_tree.c:1761
 mas_wr_node_store lib/maple_tree.c:3995 [inline]
 mas_wr_modify+0x287c/0x37d0 lib/maple_tree.c:4229
 mas_wr_store_entry+0x235/0x350 lib/maple_tree.c:4269
 mas_store_prealloc+0x155/0x2b0 lib/maple_tree.c:5460
 vma_iter_store mm/internal.h:1198 [inline]
 vma_expand+0x4ad/0x520 mm/mmap.c:666
 mmap_region+0x87f/0x16e0 mm/mmap.c:2825
 do_mmap+0x67e/0xa90 mm/mmap.c:1379
 vm_mmap_pgoff+0x12e/0x240 mm/util.c:556
 ksys_mmap_pgoff+0xc5/0x330 mm/mmap.c:1425
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881039de310 of 8 bytes by task 4087 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2817 [inline]
 mas_state_walk+0x2f3/0x5d0 lib/maple_tree.c:3712
 mas_walk+0x31/0x120 lib/maple_tree.c:4888
 lock_vma_under_rcu+0x8d/0x2a0 mm/memory.c:5497
 do_user_addr_fault arch/x86/mm/fault.c:1356 [inline]
 handle_page_fault arch/x86/mm/fault.c:1507 [inline]
 exc_page_fault+0x164/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4087 Comm: syz-fuzzer Not tainted 6.7.0-syzkaller-00562-g9f8413c4a66f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
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