syzbot

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BUG: KCSAN: data-race in mas_wr_store_entry / mtree_range_walk

write to 0xffff88816838e728 of 8 bytes by task 32611 on cpu 1:
 mas_wr_slot_store lib/maple_tree.c:3232 [inline]
 mas_wr_store_entry+0x3405/0x5ad0 lib/maple_tree.c:3528
 mas_store_prealloc+0x43e/0x690 lib/maple_tree.c:4936
 vma_iter_store_overwrite mm/vma.h:616 [inline]
 commit_merge+0x6a1/0x720 mm/vma.c:766
 vma_expand+0x301/0x460 mm/vma.c:1219
 vma_merge_new_range+0x29c/0x320 mm/vma.c:1112
 __mmap_region mm/vma.c:2766 [inline]
 mmap_region+0x10a5/0x20d0 mm/vma.c:2856
 do_mmap+0x9b2/0xbd0 mm/mmap.c:560
 vm_mmap_pgoff+0x183/0x2d0 mm/util.c:581
 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:606
 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff88816838e728 of 8 bytes by task 32613 on cpu 0:
 mtree_range_walk+0x203/0x490 lib/maple_tree.c:2040
 mas_state_walk lib/maple_tree.c:2952 [inline]
 mas_walk+0x1cc/0x370 lib/maple_tree.c:4366
 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: 0x00007f8be177efff -> 0x00007f8be175dfff

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 32613 Comm: syz.8.8100 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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