syzbot

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BUG: KCSAN: data-race in mas_wr_modify / mtree_range_walk

write to 0xffff8881044d4848 of 8 bytes by task 17166 on cpu 0:
 mas_wr_slot_store lib/maple_tree.c:3990 [inline]
 mas_wr_modify+0x155c/0x3c90 lib/maple_tree.c:4186
 mas_wr_store_entry+0x250/0x390 lib/maple_tree.c:4229
 mas_store_prealloc+0x151/0x2b0 lib/maple_tree.c:5485
 vma_iter_store mm/internal.h:1292 [inline]
 vma_expand+0x560/0x5e0 mm/mmap.c:667
 mmap_region+0x7d3/0x1550 mm/mmap.c:2793
 do_mmap+0x6a6/0xac0 mm/mmap.c:1385
 vm_mmap_pgoff+0x12f/0x250 mm/util.c:573
 ksys_mmap_pgoff+0xc6/0x340 mm/mmap.c:1431
 x64_sys_call+0x1815/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881044d4848 of 8 bytes by task 17167 on cpu 1:
 mtree_range_walk+0x1b4/0x460 lib/maple_tree.c:2782
 mas_state_walk lib/maple_tree.c:3678 [inline]
 mas_walk+0x16e/0x320 lib/maple_tree.c:4909
 lock_vma_under_rcu+0x84/0x2a0 mm/memory.c:5758
 do_user_addr_fault arch/x86/mm/fault.c:1354 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x161/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623

value changed: 0x00007fb99bdfefff -> 0x00007fb99bdddfff

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17167 Comm: syz-executor.1 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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