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BUG: KCSAN: data-race in filemap_read / generic_write_end

write to 0xffff88810adfc788 of 8 bytes by task 4871 on cpu 1:
 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 0xffff88810adfc788 of 8 bytes by task 4886 on cpu 0:
 filemap_read+0x1e2/0x1530
 generic_file_read_iter+0x76/0x320
 ext4_file_read_iter+0x1cc/0x290
 do_iter_read+0x3fd/0x6d0
 do_preadv+0x159/0x230
 __x64_sys_preadv+0x58/0x60
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000038c000 -> 0x000000000038f000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4886 Comm: syz-executor.3 Not tainted 6.2.0-rc7-syzkaller-00013-g513c1a3d3f19-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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