syzbot

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BUG: KCSAN: data-race in mas_state_walk / mas_wr_store_entry

write to 0xffff888137c3cb10 of 8 bytes by task 18218 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3919 [inline]
 mas_wr_store_entry+0x1581/0x2b50 lib/maple_tree.c:4095
 mas_store_prealloc+0x74d/0x9e0 lib/maple_tree.c:5507
 vma_iter_store_overwrite mm/vma.h:502 [inline]
 commit_merge+0x6a5/0x730 mm/vma.c:762
 vma_expand+0x1d0/0x370 mm/vma.c:1153
 vma_merge_new_range+0x296/0x310 mm/vma.c:1091
 __mmap_region mm/vma.c:2617 [inline]
 mmap_region+0x9fa/0x1580 mm/vma.c:2692
 do_mmap+0x9b3/0xbe0 mm/mmap.c:561
 vm_mmap_pgoff+0x17a/0x2e0 mm/util.c:579
 ksys_mmap_pgoff+0xc2/0x310 mm/mmap.c:607
 x64_sys_call+0x14a3/0x2ff0 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 0xffff888137c3cb10 of 8 bytes by task 18220 on cpu 1:
 mtree_range_walk lib/maple_tree.c:2781 [inline]
 mas_state_walk+0x2f5/0x650 lib/maple_tree.c:3630
 mas_walk+0x30/0x120 lib/maple_tree.c:4936
 lock_vma_under_rcu+0xa2/0x2f0 mm/mmap_lock.c:143
 do_user_addr_fault+0x233/0x1090 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:623

value changed: 0x00007fc6813d5fff -> 0xffffffff8561c850

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 18220 Comm: syz.9.5282 Tainted: G        W           6.16.0-syzkaller-08685-g260f6f4fda93 #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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