No locks available on NFS filesystem

Checklist

• I’m reporting a bug unrelated to a specific site
• I’ve verified that I’m running yt-dlp version 2022.03.08.1. (update instructions)
• I’ve checked that all provided URLs are alive and playable in a browser
• I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
• I’ve searched the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I’ve read the guidelines for opening an issue

Description

Since the last version, when I try to download a video on a NFS filesystem, I have an error.

I don’t have this error when I download the video on an ext4 filesystem, then moving it to the NFS FS with mv.

Verbose log

$ yt-dlp -vU https://www.youtube.com/watch?v=BaW_jenozKc
[debug] Command-line config: ['-vU', 'https://www.youtube.com/watch?v=BaW_jenozKc']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, err utf-8, pref UTF-8
[debug] yt-dlp version 2022.03.08.1 [c0c2c57d3]
[debug] Python version 3.10.2 (CPython 64bit) - Linux-5.16.13-arch1-1-x86_64-with-glibc2.35
[debug] exe versions: ffmpeg 5.0 (setts), ffprobe 5.0, rtmpdump 2.4
[debug] Optional libraries: brotlicffi, Cryptodome, mutagen, sqlite, websockets
[debug] Proxy map: {}
Latest version: 2022.03.08.1, Current version: 2022.03.08.1
yt-dlp is up to date (2022.03.08.1)
[debug] [youtube] Extracting URL: https://www.youtube.com/watch?v=BaW_jenozKc
[youtube] BaW_jenozKc: Downloading webpage
[youtube] BaW_jenozKc: Downloading android player API JSON
[debug] Sort order given by extractor: quality, res, fps, hdr:12, source, codec:vp9.2, lang, proto
[debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec:vp9.2(10), acodec, lang, proto, filesize, fs_approx, tbr, vbr, abr, asr, vext, aext, hasaud, id
[debug] Default format spec: bestvideo*+bestaudio/best
[info] BaW_jenozKc: Downloading 1 format(s): 248+251
[debug] Invoking downloader on "https://rr3---sn-n4g-ouxs.googlevideo.com/videoplayback?expire=1646955035&ei=uzUqYtqnEMSXvdIPwZCeiAo&ip=77.201.194.164&id=o-AEOMSTRbnz2DoolXl4RvHVG2aZH_bUUqs2GWJlUAIhbZ&itag=248&source=youtube&requiressl=yes&mh=Rf&mm=31%2C29&mn=sn-n4g-ouxs%2Csn-n4g-jqbe6&ms=au%2Crdu&mv=m&mvi=3&pl=23&initcwndbps=1832500&vprv=1&mime=video%2Fwebm&gir=yes&clen=988479&dur=9.833&lmt=1544741703689523&mt=1646933097&fvip=6&keepalive=yes&fexp=24001373%2C24007246&c=ANDROID&txp=5432432&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRQIhAPzRbbfYO_7FNwXwBW2azGJr6IOVoyKSR4e8qTNWytvvAiA4hDzvK-gvGPe5r0Q7zYiM5tKa3zrXjmj_fIbAuvBLTw%3D%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgLOhih97SPFzdVoFQk0Td4-QF_B88fyd7aCkHOKTAwGQCIQCaQ-r5_PujKmshHctCBB2Rps0-R_8JsVNok6sGc4xP0g%3D%3D"
ERROR: unable to open for writing: [Errno 37] No locks available
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2169, in _lock_file
    fcntl.flock(f,
OSError: [Errno 37] No locks available

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/http.py", line 277, in download
    ctx.stream, ctx.tmpfilename = self.sanitize_open(
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/common.py", line 220, in inner
    return func(self, *args, **kwargs)
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/common.py", line 237, in sanitize_open
    return sanitize_open(filename, open_mode)
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 678, in sanitize_open
    stream = locked_file(filename, open_mode, block=False).open()
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2236, in open
    return self.__enter__()
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2209, in __enter__
    _lock_file(self.f, exclusive, self.block)
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2176, in _lock_file
    fcntl.lockf(f,
OSError: [Errno 37] No locks available


[debug] Invoking downloader on "https://rr3---sn-n4g-ouxs.googlevideo.com/videoplayback?expire=1646955035&ei=uzUqYtqnEMSXvdIPwZCeiAo&ip=77.201.194.164&id=o-AEOMSTRbnz2DoolXl4RvHVG2aZH_bUUqs2GWJlUAIhbZ&itag=251&source=youtube&requiressl=yes&mh=Rf&mm=31%2C29&mn=sn-n4g-ouxs%2Csn-n4g-jqbe6&ms=au%2Crdu&mv=m&mvi=3&pl=23&initcwndbps=1832500&vprv=1&mime=audio%2Fwebm&gir=yes&clen=142292&dur=9.841&lmt=1506055557712479&mt=1646933097&fvip=6&keepalive=yes&fexp=24001373%2C24007246&c=ANDROID&sparams=expire%2Cei%2Cip%2Cid%2Citag%2Csource%2Crequiressl%2Cvprv%2Cmime%2Cgir%2Cclen%2Cdur%2Clmt&sig=AOq0QJ8wRgIhAOc-HOwi-iDH4fOJY7NTZdat-OI55SysvVtBne5HMbgRAiEAqCePlCDfEqdCCzJjOqYcCQZsCAUHGvcogRWSL5tBj1U%3D&lsparams=mh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps&lsig=AG3C_xAwRQIgLOhih97SPFzdVoFQk0Td4-QF_B88fyd7aCkHOKTAwGQCIQCaQ-r5_PujKmshHctCBB2Rps0-R_8JsVNok6sGc4xP0g%3D%3D"
ERROR: unable to open for writing: [Errno 37] No locks available
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2169, in _lock_file
    fcntl.flock(f,
OSError: [Errno 37] No locks available

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/http.py", line 277, in download
    ctx.stream, ctx.tmpfilename = self.sanitize_open(
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/common.py", line 220, in inner
    return func(self, *args, **kwargs)
  File "/usr/lib/python3.10/site-packages/yt_dlp/downloader/common.py", line 237, in sanitize_open
    return sanitize_open(filename, open_mode)
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 678, in sanitize_open
    stream = locked_file(filename, open_mode, block=False).open()
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2236, in open
    return self.__enter__()
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2209, in __enter__
    _lock_file(self.f, exclusive, self.block)
  File "/usr/lib/python3.10/site-packages/yt_dlp/utils.py", line 2176, in _lock_file
    fcntl.lockf(f,
OSError: [Errno 37] No locks available

[dirkf]

Which is why the daemon that handles NLM has to be running (as in your linked reference), as in my comment above.

[ohnonot]

I can confirm the above comment; a simple systemctl start rpc-statd.service was enough to solve the problem. Make sure to enable the service if that helps.