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BUG: KCSAN: data-race in filemap_read / generic_write_end

write to 0xffff88810a95b648 of 8 bytes by task 19968 on cpu 0:
 generic_write_end+0xb4/0x360
 ext4_da_write_end+0x4bd/0x630
 generic_perform_write+0x253/0x3d0
 ext4_buffered_write_iter+0x234/0x3e0
 ext4_file_write_iter+0x2d2/0x1270
 vfs_write+0x45a/0x750
 ksys_write+0xeb/0x1a0
 __x64_sys_write+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810a95b648 of 8 bytes by task 19970 on cpu 1:
 filemap_read+0x1e2/0x1530
 generic_file_read_iter+0x76/0x320
 ext4_file_read_iter+0x1cc/0x290
 generic_file_splice_read+0xe3/0x290
 splice_direct_to_actor+0x25a/0x5f0
 do_splice_direct+0x104/0x180
 do_sendfile+0x3b8/0x950
 __x64_sys_sendfile64+0x110/0x150
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000d87000 -> 0x0000000000d88000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19970 Comm: syz-executor.0 Tainted: G        W          6.2.0-rc7-syzkaller-00002-gd2d11f342b17-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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