[Libguestfs] nbdkit error: "write reply: NBD_CMD_WRITE: Broken pipe"

[Nikolaus Rath]

On May 02 2022, Laszlo Ersek <lersek at redhat.com> wrote:
> 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.

Ah, that helps. I'll keep an eye out for this. 


Best,
-Nikolaus

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