[Qemu-devel] [Bug 1772086] [NEW] malformed serial data being sent from guest

[Qemu-devel] [Bug 1772086] [NEW] malformed serial data being sent from guest

[Patto]

Public bug reported:

When sending data through serial from guest each time 0x0A byte is sent
0x0D is sent before it. For example, when sending {0x29, 0x0A} on the
other end I receive {0x29, 0x0D, 0x0A}.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: com serial

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Peter Maydell]

Something somewhere in the stack is converting LF to CRLF. This could be
something inside your guest, or in QEMU, or in the host; to find out
where we need more detail.

Can you describe your setup, including:
 * complete QEMU command line
 * how you're sending data inside the guest
 * how you're reading it on the host end
please?

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Patto]

I am unable to provide complete QEMU command line as I'm using virt-manager to deal with configuration. I can say that two serial ports are linked with physical ones through the /dev/ttyS* files.
The guests I tested it with are Windows 98 and Windows XP. For the testing I connected one port to another. I could confirm through a kernel level serial monitor that I was indeed sending just \n but on the second port I received \r\n. I also received \r\n when the port was read by the host.
Host is Ubuntu Xenial.

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Patto]

After doing a bit of research I think line 142 in file chardev/char-
serial.c is problematic.
https://github.com/qemu/qemu/blob/master/chardev/char-serial.c#L142

It enables output processing, which is something unwanted here. With a
simple test program I found out that by default, besides OPOST, ONLCR
flag is set in c_oflag. I guess fix would be removing OPOST flag, which
would disable any output processing, or setting c_oflag to 0 just to be
sure.

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Patto]

Seems like the problems isn't really new and might be at least 6 years
old if not more. https://robert.penz.name/550/mapping-a-serial-device-
to-a-kvm-guest-may-lead-to-communication-problems/

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Thomas Huth]

It's even older than 6 years, see:
https://lists.nongnu.org/archive/html/qemu-devel/2006-06/msg00196.html
and:
https://bugs.launchpad.net/qemu/+bug/1407813
https://bugs.launchpad.net/qemu/+bug/1715296

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  New

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Thomas Huth]

Patch has now been committed here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=12fb0ac0575df83cec72ec

** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1772086

Title:
  malformed serial data being sent from guest

Status in QEMU:
  Fix Committed

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

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[Qemu-devel] [Bug 1772086] Re: malformed serial data being sent from guest

[Thomas Huth]

** Changed in: qemu
       Status: Fix Committed => Fix Released

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Title:
  malformed serial data being sent from guest

Status in QEMU:
  Fix Released

Bug description:
  When sending data through serial from guest each time 0x0A byte is
  sent 0x0D is sent before it. For example, when sending {0x29, 0x0A} on
  the other end I receive {0x29, 0x0D, 0x0A}.

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1772086/+subscriptions