================================================================== BUG: KCSAN: data-race in __anon_vma_prepare / handle_mm_fault write to 0xffff88810a2eaf88 of 8 bytes by task 9588 on cpu 0: __anon_vma_prepare+0x12f/0x2d0 mm/rmap.c:207 anon_vma_prepare include/linux/rmap.h:149 [inline] do_cow_fault mm/memory.c:4188 [inline] do_fault mm/memory.c:4302 [inline] handle_pte_fault mm/memory.c:4558 [inline] __handle_mm_fault mm/memory.c:4693 [inline] handle_mm_fault+0x1729/0x1a50 mm/memory.c:4791 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:91 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0x77/0x90 lib/usercopy.c:33 copy_to_user include/linux/uaccess.h:200 [inline] do_pipe2+0x60/0xf0 fs/pipe.c:1009 __do_sys_pipe fs/pipe.c:1030 [inline] __se_sys_pipe fs/pipe.c:1028 [inline] __x64_sys_pipe+0x1d/0x30 fs/pipe.c:1028 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88810a2eaf88 of 8 bytes by task 9582 on cpu 1: anon_vma_prepare include/linux/rmap.h:146 [inline] do_cow_fault mm/memory.c:4188 [inline] do_fault mm/memory.c:4302 [inline] handle_pte_fault mm/memory.c:4558 [inline] __handle_mm_fault mm/memory.c:4693 [inline] handle_mm_fault+0xb4a/0x1a50 mm/memory.c:4791 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1390 handle_page_fault arch/x86/mm/fault.c:1475 [inline] exc_page_fault+0x91/0x220 arch/x86/mm/fault.c:1531 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 value changed: 0x0000000000000000 -> 0xffff88814c7f9b40 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9582 Comm: syz-executor.3 Tainted: G W 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================