youtube-dl wrongly reports no xattr support, throws error, interrupts playlist download

[NickSto]

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Description of your issue, suggested solution and other information

While downloading videos from a playlist using the --xattrs option, I ran into an issue where a video is properly filtered out by --max-filesize, but youtube-dl also throws an error saying extended attributes aren't supported (incorrect), and exits in the middle of the playlist.

Here's the command I ran:
$ youtube-dl --no-mtime --xattrs --playlist-reverse --max-filesize 500m -f 22 -o '%(playlist_index)s - %(title)s [src %(uploader_id)s] [posted %(upload_date)s] [id %(id)s].%(ext)s' https://www.youtube.com/user/pbsideachannel
And the log messages for the video where it threw the error:

[download] Downloading video 318 of 367
[youtube] zPDgEUAowPA: Downloading webpage
[youtube] zPDgEUAowPA: Downloading video info webpage
[youtube] zPDgEUAowPA: Extracting video information
[youtube] zPDgEUAowPA: Downloading MPD manifest
[download] File is larger than max-filesize (5568799069 bytes > 524288000 bytes). Aborting.
[metadata] Writing metadata to file's xattrs
ERROR: This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)

If I remove the --xattrs option from the command, the download continues fine, minus that ERROR line.

It seems to have the same underlying cause as #5589. If the underlying cause can't be fixed, it could probably be worked around with a similar solution, turning it into a warning, not an error.

Technical details

This is repeatable, and the same log messages are printed when you try it on the single video:
$ youtube-dl --max-filesize 500m -f 22 --xattrs 'https://www.youtube.com/watch?v=zPDgEUAowPA'
vs
$ youtube-dl --max-filesize 500m -f 22 'https://www.youtube.com/watch?v=zPDgEUAowPA'

I know that extended attributes are actually supported on the filesystem, since they were written to other videos in the playlist (examined with the attr command).

All the same, this is the line in /etc/fstab for one of the drives it occurred on:
/dev/mapper/ubuntu--vg-root / ext4 discard,noatime,nodiratime,errors=remount-ro 0 1
I'm on Ubuntu 16.04.3, 64-bit, and the drives in question (it happened on multiple) are all ext4-formatted.
Just in case it matters, all the drives are full-disk encrypted. One (the one whose fstab line is shown) is using the standard Ubuntu dm-crypt/cryptsetup/LUKS, and the other uses VeraCrypt (in TrueCrypt compatibility mode).

Here's the verbose version of the single-video command:

$ youtube-dl -v --max-filesize 500m -f 22 --xattrs 'https://www.youtube.com/watch?v=zPDgEUAowPA'
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--max-filesize', '500m', '-f', '22', '--xattrs', 'https://www.youtube.com/watch?v=zPDgEUAowPA']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.10
[debug] Python version 3.5.2 - Linux-4.10.0-42-generic-x86_64-with-Ubuntu-16.04-xenial
[debug] exe versions: ffmpeg 2.8.11-0ubuntu0.16.04.1, ffprobe 2.8.11-0ubuntu0.16.04.1
[debug] Proxy map: {}
[youtube] zPDgEUAowPA: Downloading webpage
[youtube] zPDgEUAowPA: Downloading video info webpage
[youtube] zPDgEUAowPA: Extracting video information
[youtube] zPDgEUAowPA: Downloading MPD manifest
[debug] Invoking downloader on 'https://r2---sn-n4v7knls.googlevideo.com/videoplayback?pl=22&source=youtube&expire=1513183512&dur=39631.772&mv=m&mt=1513161820&ms=au&mn=sn-n4v7knls&mm=31&ratebypass=yes&mime=video%2Fmp4&key=yt6&lmt=1486024775920876&requiressl=yes&initcwndbps=1561250&itag=22&ei=uAQxWo52zbn6A5aMqegG&id=o-AIzBRuAh2a8OMn1vm2g14y88yMQlatBctUNLq7T4YjXe&sparams=dur%2Cei%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Crequiressl%2Csource%2Cexpire&signature=369E8F050EA510D65E8125676873436916AC340B.E1ADD4E39DDA8AE5F584D280AA06FD79C25B6C93&ipbits=0&ip=67.174.242.16'
[download] File is larger than max-filesize (5568799069 bytes > 524288000 bytes). Aborting.
[metadata] Writing metadata to file's xattrs
ERROR: This filesystem doesn't support extended attributes. (You may have to enable them in your /etc/fstab)
Traceback (most recent call last):
  File "/home/me/.local/lib/python3.5/site-packages/youtube_dl/utils.py", line 3760, in write_xattr
    import xattr
ImportError: No module named 'xattr'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/me/.local/lib/python3.5/site-packages/youtube_dl/postprocessor/xattrpp.py", line 54, in run
    write_xattr(filename, xattrname, byte_value)
  File "/home/me/.local/lib/python3.5/site-packages/youtube_dl/utils.py", line 3823, in write_xattr
    raise XAttrMetadataError(p.returncode, stderr)
youtube_dl.utils.XAttrMetadataError: setfattr: The Bee Movie But Every Time They Say Bee We Explain The Deal With Bee Movie-zPDgEUAowPA.mp4: No such file or directory

[NickSto]

That was quick, thanks!