syzbot

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BUG: KCSAN: data-race in __anon_vma_prepare / lock_vma_under_rcu

write to 0xffff888103103af0 of 8 bytes by task 17917 on cpu 0:
 __anon_vma_prepare+0x147/0x2c0 mm/rmap.c:214
 anon_vma_prepare include/linux/rmap.h:164 [inline]
 do_anonymous_page mm/memory.c:4430 [inline]
 do_pte_missing mm/memory.c:3878 [inline]
 handle_pte_fault mm/memory.c:5300 [inline]
 __handle_mm_fault mm/memory.c:5441 [inline]
 handle_mm_fault+0x1aea/0x27e0 mm/memory.c:5606
 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x2f5/0x6d0 arch/x86/mm/fault.c:1563
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
 rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:57
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 _copy_to_user+0x77/0xa0 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 f_getown_ex fs/fcntl.c:240 [inline]
 do_fcntl+0x9e0/0xec0 fs/fcntl.c:396
 __do_sys_fcntl fs/fcntl.c:472 [inline]
 __se_sys_fcntl+0xc4/0x180 fs/fcntl.c:457
 __x64_sys_fcntl+0x43/0x50 fs/fcntl.c:457
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

read to 0xffff888103103af0 of 8 bytes by task 17914 on cpu 1:
 lock_vma_under_rcu+0x161/0x2a0 mm/memory.c:5771
 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: 0x0000000000000000 -> 0xffff88810e5f2ea0

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 17914 Comm: syz-executor.2 Tainted: G        W          6.9.0-rc1-syzkaller-00274-g486291a0e624 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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