syzbot

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BUG: KCSAN: data-race in __anon_vma_prepare / lock_vma_under_rcu

write to 0xffff8881194b71c0 of 8 bytes by task 12932 on cpu 0:
 __anon_vma_prepare+0x147/0x2c0 mm/rmap.c:214
 vmf_anon_prepare mm/memory.c:3219 [inline]
 wp_page_copy mm/memory.c:3258 [inline]
 do_wp_page+0xe20/0x1e70 mm/memory.c:3660
 handle_pte_fault mm/memory.c:5316 [inline]
 __handle_mm_fault mm/memory.c:5441 [inline]
 handle_mm_fault+0xb7f/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
 __put_user_8+0x11/0x20 arch/x86/lib/putuser.S:105
 __do_sys_io_setup fs/aio.c:1408 [inline]
 __se_sys_io_setup+0x95/0x1b0 fs/aio.c:1388
 __x64_sys_io_setup+0x31/0x40 fs/aio.c:1388
 x64_sys_call+0x8b2/0x2d30 arch/x86/include/generated/asm/syscalls_64.h:207
 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 0xffff8881194b71c0 of 8 bytes by task 12925 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 -> 0xffff888102349d00

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12925 Comm: syz-executor.3 Tainted: G        W          6.9.0-rc6-syzkaller-00053-g0106679839f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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