bug#62213: GSSH ERROR while sending store items with 'guix deploy'

[Maxim Cournoyer <maxim.cournoyer@gmail.com>]

Hi Ludo!

Ludovic Courtès <ludo@gnu.org> writes:

> Hi,
>
> Maxim Cournoyer <maxim.cournoyer@gmail.com> skribis:
>
>> I'm trying to update one of my machines using 'guix deploy' and I keep
>> getting the following error:
>>
>> guix deploy: sending 599 store items (3,794 MiB) to 'x200.local'...
>>  20% ▕███████████████████▋ ▏
>
> [...]
>
>>    716:13  6 (process-stderr _ _)
>> In guix/build/utils.scm:
>>   1014:11  5 (loop _ _)
>> In unknown file:
>>            4 (put-bytevector #<unknown channel (freed) 7fca183c31c0> …)
>> In ice-9/boot-9.scm:
>>   1685:16  3 (raise-exception _ #:continuable? _)
>>   1683:16  2 (raise-exception _ #:continuable? _)
>>   1685:16  1 (raise-exception _ #:continuable? _)
>>   1685:16  0 (raise-exception _ #:continuable? _)
>>
>> ice-9/boot-9.scm:1685:16: In procedure raise-exception:
>> Throw to key `guile-ssh-error' with args `("write_to_channel_port"
>> "Parent session is not connected" #<unknown channel (freed)
>
> What version of guix-daemon is running on the machine that runs "guix
> deploy"?

Two variants of 1.4.0-4.01fd830:

--8<---------------cut here---------------start------------->8---
$ pgrep -a guix-daemon
6883 /gnu/store/izxlr8c7aml0ajqpblidkq014wyxcczz-guix-1.4.0-4.01fd830/bin/guix-daemon 6822                guixbuild --max-silent-time 0 --timeout 0 --log-compression none --discover=yes --substitute-urls http://127.0.0.1:8181 https://ci.guix.gnu.org https://bordeaux.guix.gnu.org --max-jobs=4
13519 /gnu/store/izxlr8c7aml0ajqpblidkq014wyxcczz-guix-1.4.0-4.01fd830/bin/guix-daemon 13504               guixbuild --max-silent-time 0 --timeout 0 --log-compression none --discover=yes --substitute-urls http://127.0.0.1:8181 https://ci.guix.gnu.org https://bordeaux.guix.gnu.org --max-jobs=4
27855 /gnu/store/izxlr8c7aml0ajqpblidkq014wyxcczz-guix-1.4.0-4.01fd830/bin/guix-daemon --build-users-group guixbuild --max-silent-time 0 --timeout 0 --log-compression none --discover=yes --substitute-urls http://127.0.0.1:8181 https://ci.guix.gnu.org https://bordeaux.guix.gnu.org --max-jobs=4
28995 /gnu/store/izxlr8c7aml0ajqpblidkq014wyxcczz-guix-1.4.0-4.01fd830/bin/guix-daemon 28982               guixbuild --max-silent-time 0 --timeout 0 --log-compression none --discover=yes --substitute-urls http://127.0.0.1:8181 https://ci.guix.gnu.org https://bordeaux.guix.gnu.org --max-jobs=4
--8<---------------cut here---------------end--------------->8---

> Do the sshd logs on x200.local show anything interesting at the moment
> the connection is dropped?

In my logs, at around the time I was observing these problems, I see a
couple instances of:

--8<---------------cut here---------------start------------->8---
Mar 15 22:03:58 localhost shepherd[1]: Service sshd-7 has been started. 
Mar 15 22:03:59 localhost sshd[24950]: Accepted publickey for mcournoyer from 192.168.10.15 port 40696 ssh2: RSA SHA256:bNjGrjJ6+adVo155SohxuXbuxeJB+w/+vQzhdFs3vUg
Mar 15 22:07:57 localhost sshd[24952]: ssh_dispatch_run_fatal: Connection from user mcournoyer 192.168.10.15 port 40696: invalid format
Mar 15 22:07:57 localhost shepherd[1]: 0 connections still in use after sshd-7 termination. 
Mar 15 22:07:57 localhost shepherd[1]: Service sshd-7 (PID 24950) exited with 255. 
Mar 15 22:07:57 localhost shepherd[1]: Service sshd-7 has been disabled. 
Mar 15 22:07:57 localhost shepherd[1]: Transient service sshd-7 terminated, now unregistered. 
Mar 15 22:14:41 localhost shepherd[1]: Service sshd-8 has been started. 
Mar 15 22:14:42 localhost sshd[25142]: Accepted publickey for mcournoyer from 192.168.10.15 port 45596 ssh2: RSA SHA256:bNjGrjJ6+adVo155SohxuXbuxeJB+w/+vQzhdFs3vUg
Mar 15 22:20:02 localhost shepherd[1]: 0 connections still in use after sshd-8 termination. 
Mar 15 22:20:02 localhost shepherd[1]: Service sshd-8 (PID 25142) exited with 255. 
Mar 15 22:20:02 localhost shepherd[1]: Service sshd-8 has been disabled. 
Mar 15 22:20:02 localhost shepherd[1]: Transient service sshd-8 terminated, now unregistered. 
Mar 15 22:24:19 localhost shepherd[1]: Service sshd-9 has been started. 
Mar 15 22:24:20 localhost sshd[25463]: Accepted publickey for mcournoyer from 192.168.10.15 port 41702 ssh2: RSA SHA256:bNjGrjJ6+adVo155SohxuXbuxeJB+w/+vQzhdFs3vUg
--8<---------------cut here---------------end--------------->8---

Where the 'ssh_dispatch_run_fatal ... invalid format' stands out to me.

I'll report with more if I can reproduce the issue again.

-- 
Thanks,
Maxim