On May 03 2022, rjones at redhat.com (Richard W.M. Jones) wrote:
>> So I tried to reproduce this, and noticed something odd. It seems I can
>> disconnect the nbd device (nbd-client -d) while there are still requests
>> in flight:
>>
>> May 02 15:20:50 vostro.rath.org kernel: nbd1: detected capacity change from
>> 0 to 52428800
>> May 02 15:20:50 vostro.rath.org kernel: block nbd1: NBD_DISCONNECT
>> May 02 15:20:50 vostro.rath.org kernel: block nbd1: Disconnected due to user
>> request.
>> May 02 15:20:50 vostro.rath.org kernel: block nbd1: shutting down sockets
>> May 02 15:20:50 vostro.rath.org kernel: I/O error, dev nbd1, sector 776 op
>> 0x0:(READ)
>> flags 0x80700 phys_seg 29 prio class 0
>> May 02 15:20:50 vostro.rath.org kernel: I/O error, dev nbd1, sector 776 op
>> 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
>> May 02 15:20:50 vostro.rath.org kernel: Buffer I/O error on dev nbd1,
>> logical block 97, async page read
>> May 02 15:20:50 vostro.rath.org kernel: block nbd1: Attempted send on
>> invalid socket
>> May 02 15:20:50 vostro.rath.org kernel: I/O error, dev nbd1, sector 0 op
>> 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0
>> May 02 15:20:50 vostro.rath.org kernel: block nbd1: Attempted send on
>> invalid socket
>> May 02 15:20:50 vostro.rath.org kernel: I/O error, dev nbd1, sector 0 op
>> 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0
>>
>> This was generated by running:
>>
>> $ nbd-client localhost /dev/nbd1 && mkfs.ext4 /dev/nbd1 && nbd-client -d
>> /dev/nbd1
>>
>> Is that expected behavior?
>
> It's a bit unexpected to me. Adding Wouter to the thread - he might
> have an idea here, especially if there's a way to have "nbd-client -d"
> wait for pending requests to finish before disconnecting.
>
> I don't use the kernel client very much myself. We mostly use either
> libnbd or the qemu client.
Did you Cc Wouter to your email? I didn't see a Cc header, but perhaps
this was stripped by the mailing list software?
Or is there a more appropriate list where I could follow-up on this?
Thanks!
-Nikolaus
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