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BUG: KCSAN: data-race in filemap_read / generic_write_end

write to 0xffff88810af32428 of 8 bytes by task 3942 on cpu 0:
 generic_write_end+0xb4/0x360
 fat_write_end+0x4e/0x160
 generic_perform_write+0x253/0x3d0
 __generic_file_write_iter+0xe6/0x290
 generic_file_write_iter+0x7d/0x1c0
 do_iter_write+0x418/0x700
 vfs_iter_write+0x50/0x70
 iter_file_splice_write+0x42b/0x7b0
 direct_splice_actor+0x84/0xa0
 splice_direct_to_actor+0x2ee/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

read to 0xffff88810af32428 of 8 bytes by task 3929 on cpu 1:
 filemap_read+0x1e2/0x1530
 generic_file_read_iter+0x76/0x320
 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: 0x00000000000004d6 -> 0x00000000000004d8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3929 Comm: syz-executor.3 Not tainted 6.2.0-rc6-syzkaller-00239-g0136d86b7852-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode

write to 0xffff88810af32470 of 8 bytes by task 3942 on cpu 0:
 writeback_single_inode+0x10e/0x4a0
 sync_inode_metadata+0x56/0x80
 __generic_file_fsync+0xf9/0x140
 fat_file_fsync+0x4c/0x100
 vfs_fsync_range+0x10b/0x120
 generic_file_write_iter+0x191/0x1c0
 do_iter_write+0x418/0x700
 vfs_iter_write+0x50/0x70
 iter_file_splice_write+0x42b/0x7b0
 direct_splice_actor+0x84/0xa0
 splice_direct_to_actor+0x2ee/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

read to 0xffff88810af32470 of 8 bytes by task 3929 on cpu 1:
 vfs_fsync_range+0x9c/0x120
 generic_file_write_iter+0x191/0x1c0
 do_iter_write+0x418/0x700
 vfs_iter_write+0x50/0x70
 iter_file_splice_write+0x42b/0x7b0
 direct_splice_actor+0x84/0xa0
 splice_direct_to_actor+0x2ee/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: 0x0000000000000007 -> 0x0000000000000084

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3929 Comm: syz-executor.3 Not tainted 6.2.0-rc6-syzkaller-00239-g0136d86b7852-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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