Re: [chrony-users] No packets transmitted when using Yocto 4.3.1

[ Thread Index | Date Index | More chrony.tuxfamily.org/chrony-users Archives ]

To: chrony-users@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
From: Thomas Lange <thomas@xxxxxxxxxxxx>
Date: Tue, 2 Jan 2024 11:54:32 +0100
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=corelatus.se; h= cc:content-transfer-encoding:content-type:content-type:date:date :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:subject:subject:to:to; s=fm1; t=1704192875; x=1704279275; bh=KBLVpQjzNHgfhvYPukXuKWPjgY+/w86h3QV9j9iW+Fo=; b= B+9aJItHw6bC9B4QvtqrKhBmq+269gkqgfD+lzENswx91dpbGmgFIj+8HiNFIb+D neMZpN/j3j0NaCvrilW/nCYKnN5GLqs1Y+trh9pjf/VLCvLO1gQSupu0ehjBGtbc aCcMVGDNxOigKT4RQcYDN3F1lXlURf7zW/NEeb/CM80akzjY2nDvP7VmtJoHvZ3r 9iX7oiWceU9dGWBxGl2FcJIUQTVjnKApO5pXul/XvZU8E4+WMX9y42DOpdrrG4g4 g1Fp3tmuiAIP58w18fIn1mZe0SgralHsytuE45pLcM8qDv/J9DsPzGVDOId8peVx s8ktRdP3xK7lXkMUPDLAAA==
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :content-type:date:date:feedback-id:feedback-id:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to:x-me-proxy:x-me-proxy :x-me-sender:x-me-sender:x-sasl-enc; s=fm2; t=1704192875; x= 1704279275; bh=KBLVpQjzNHgfhvYPukXuKWPjgY+/w86h3QV9j9iW+Fo=; b=o qkb5M535//2eY6pRmBzS8C+FAAZGWKM6YCQ3DWAbeDuz6sF64eD17UVhLzpHEqvn JZyXFmZ5Kd+DTBOWWC2oeWBXMXF35gRtcvHeSgn6AYLrZZuduolL8btxl/lpK5N3 iH8DTu7v9MNkBJWETEBub/UIQmLOX81bUf2F8eP0pF0kBDoydcLW8Yy3QN+Ih6lF EzlZTFWyPqRJQUVN5dUFZPszNOfUnOC9gSgF1G61gsvCKh6xK8IYZueIiN0Fyvv2 VqhXg5vIWnk0/V0+yFWdoSvpxvLvM2v5gJaGBFwPeSKK/9eoLYSkOTt/LcSUBga6 wetnv/ACV80dClbjIe0NQ==
Feedback-id: ia69946ac:Fastmail

On 2024-01-02 11:34, Miroslav Lichvar wrote:

On Fri, Dec 15, 2023 at 11:46:57AM +0100, Thomas Lange wrote:

Hi,
when I cross compile Chrony for a 32bit ARM system using Yocto 4.3.1, no NTP
packets are transmitted.

cmsg_type is set to SO_TIMESTAMPING_NEW.
This is rejected by __sock_cmsg_send() in net/core/sock.c and no packet
is transmitted:

Before I dig deeper, I want to check if this is a known issue already?


To me that sounds like a mismatch between installed kernel headers and
the kernel that actually runs the executable. I don't have much
experience with embedded systems. On 32-bit OpenWrt I didn't see any
issues.


The root cause is a kernel bug. I have reported it to netdev:

  https://lore.kernel.org/netdev/a9090be2-ca7c-494c-89cb-49b1db2438ba@xxxxxxxxxxxx/T/#u

A proper patch has not been committed yet though, but it seems that my
one-line fix should do it according to comments so far.

AFAICT this bug breaks timestamping via cmsg (i.e. Chrony) for all 32bit
platforms using 64bit time. There could be other cases when SO_TIMESTAMPING
is mapped to SO_TIMESTAMPING_NEW though. I haven't looked into that.

/Thomas

--

To unsubscribe email chrony-users-request@xxxxxxxxxxxxxxxxxxxxwith "unsubscribe" in the subject.For help email chrony-users-request@xxxxxxxxxxxxxxxxxxxxwith "help" in the subject.

Trouble?  Email listmaster@xxxxxxxxxxxxxxxxxxxx.

Follow-Ups:
- Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
  - From: Miroslav Lichvar
- [chrony-users] Re: Re: No packets transmitted when using Yocto 4.3.1
  - From: infection . many550

References:
- Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
  - From: Miroslav Lichvar

Messages sorted by: [ date | thread ]
Prev by Date: Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
Next by Date: Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
Previous by thread: Re: [chrony-users] No packets transmitted when using Yocto 4.3.1
Next by thread: Re: [chrony-users] No packets transmitted when using Yocto 4.3.1

Mail converted by MHonArc 2.6.19+

http://listengine.tuxfamily.org/