Libguestfs - May 2022 - nbdkit error: "write reply: NBD_CMD_WRITE: Broken pipe"

Hi,

I am developing a new nbdkit plugin, and occasionally I am getting errors like
this:

`nbdkit: s3backer.8: error: write reply: NBD_CMD_WRITE: Broken pipe
nbdkit: s3backer.15: error: write reply: NBD_CMD_WRITE: Broken pipe`

(where "s3backer" is the plugin name).

I am not sure what to make of these. Can someone advise?

Looking at the nbdkit source, it looks to me like these are generated when there
is a problem sending a reply to the nbd client. On the other hand, I am using
the standard 'nbd-client' program through a Unix socket, so I'd
think this should not result in errors...?

Best,
-Nikolaus
--
GPG Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F

             ?Time flies like an arrow, fruit flies like a Banana.?

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On 05/01/22 18:35, Nikolaus Rath wrote:
> Hi,
> 
> I am developing a new nbdkit plugin, and occasionally I am getting
> errors like this:
> 
> |nbdkit: s3backer.8: error: write reply: NBD_CMD_WRITE: Broken pipe
> nbdkit: s3backer.15: error: write reply: NBD_CMD_WRITE: Broken pipe|
> 
> 
> (where "s3backer" is the plugin name).
> 
> I am not sure what to make of these. Can someone advise?
> 
> Looking at the nbdkit source, it looks to me like these are generated
> when there is a problem sending a reply to the nbd client. On the other
> hand, I am using the standard 'nbd-client' program through a Unix
> socket, so I'd think this should not result in errors...?
If your plugin managed to crash nbd-client remotely, that would be
consistent with this symptom.

Laszlo
> 
> Best,
> -Nikolaus
> --
> GPG Fingerprint: ED31 791B 2C5C 1613 AF38 8B8A D113 FCAC 3C4E 599F
> 
> ???????????? ?Time flies like an arrow, fruit flies like a Banana.?
> 
> 
> 
> 
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