================================================================== BUG: KCSAN: data-race in filemap_fault / generic_write_end write to 0xffff88812136dac8 of 8 bytes by task 14543 on cpu 1: i_size_write include/linux/fs.h:907 [inline] generic_write_end+0x96/0x180 fs/buffer.c:2187 ext4_da_write_end+0x448/0x510 fs/ext4/inode.c:3042 generic_perform_write+0x261/0x400 mm/filemap.c:3776 ext4_buffered_write_iter+0x19d/0x290 fs/ext4/file.c:268 ext4_file_write_iter+0x227/0xda0 call_write_iter include/linux/fs.h:2074 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812136dac8 of 8 bytes by task 14544 on cpu 0: i_size_read include/linux/fs.h:885 [inline] filemap_fault+0x87/0x8b0 mm/filemap.c:3093 __do_fault mm/memory.c:3868 [inline] do_shared_fault mm/memory.c:4238 [inline] do_fault mm/memory.c:4316 [inline] handle_pte_fault mm/memory.c:4570 [inline] __handle_mm_fault mm/memory.c:4705 [inline] handle_mm_fault+0xc78/0x1590 mm/memory.c:4803 do_user_addr_fault+0x617/0xb90 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1484 [inline] exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540 asm_exc_page_fault+0x1e/0x30 copy_user_enhanced_fast_string+0xe/0x40 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] copyout lib/iov_iter.c:155 [inline] copy_page_to_iter_iovec lib/iov_iter.c:226 [inline] __copy_page_to_iter lib/iov_iter.c:850 [inline] copy_page_to_iter+0x2d9/0x950 lib/iov_iter.c:878 copy_folio_to_iter include/linux/uio.h:153 [inline] filemap_read+0x1126/0x1430 mm/filemap.c:2727 generic_file_read_iter+0x72/0x320 mm/filemap.c:2822 call_read_iter include/linux/fs.h:2068 [inline] new_sync_read fs/read_write.c:400 [inline] vfs_read+0x66c/0x750 fs/read_write.c:481 ksys_read+0xd9/0x190 fs/read_write.c:619 __do_sys_read fs/read_write.c:629 [inline] __se_sys_read fs/read_write.c:627 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:627 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000000750f3 -> 0x00000000000752b5 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14544 Comm: syz-executor.4 Not tainted 5.17.0-rc4-syzkaller-00051-gc5d9ae265b10-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================