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https://issues.apache.org/jira/browse/GUACAMOLE-1354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17361757#comment-17361757
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Jimmy commented on GUACAMOLE-1354:
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[~mjumper] I checked that the guacamole client sends the "ack". It always sends
the "ack" message.
Instead, it happens that the guacd frequently doesn't receive the "ack" message.
I found the following facts.
In cases that the guacd receives the "ack" message prior to the call
*guac_rdp_print_job_wait_for_ack()*, I never see this issue.
But, this issue happens only if the guacd doesn't receive the "ack" message
prior to the call of *guac_rdp_print_job_wait_for_ack()*.
In *guac_rdp_print_job_wait_for_ack()*, the call of *pthread_cond_wait()*
freezes the current guacd process.
I can't know why.
> Printing problem that freezes the guacd
> ---------------------------------------
>
> Key: GUACAMOLE-1354
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1354
> Project: Guacamole
> Issue Type: Bug
> Components: guacamole-client, guacamole-server
> Affects Versions: 1.3.0
> Environment: Windows Server 2019 Datacenter, Ubuntu 18.04, Chrome:
> 90.0.4430.212, Windows 10 Pro 20H2
> Reporter: Jimmy
> Priority: Minor
> Attachments: guacd-printing.log, image-2021-05-25-11-05-36-823.png,
> image-2021-05-28-16-15-17-531.png
>
>
> I found the printing problem that freezes the guacd when printing quickly and
> successively.
>
> *[Test environment]*
> RDP Server: Windows Server 2019 Datacenter
> Server: Ubuntu 18.04
> Guacamole Client:
> [#6644955f|https://github.com/apache/guacamole-client/commit/6644955fff07db7844f0b495b4abfabf2b700e21]
> on master branch
> Guacamole Server:
> [#44145f68|https://github.com/apache/guacamole-server/commit/44145f681aa3cf08e9cf01e99a68096c77bcab39]
> on master branch
> Chrome: 90.0.4430.212
> User: Windows 10 Pro, 20H2
> *[Test case]*
> # Connect to Windows Server 2019 through Apache guacamole.
> # Open *Notepad*.
> # Type some text.
> # Press Ctrl+P and select *Guacamole Printer.*
> # Click *"Print"* button.
> !image-2021-05-25-11-05-36-823.png!
> When repeating step 4 and 5 quickly and successively, we can see this issue
> soon.
> I attach the guacamole server log when encountering the freeze issue.
> *[Rough Analysis]*
> When the guacd doesn't receive *GUAC_RDP_PRINT_JOB_ACK_RECEIVED* from the
> guacamole client due to unknown reason, *guac_rdp_print_job_wait_for_ack()*
> function suspends execution of the *guac_rdp_print_job_output_thread()*
> thread for ever.
>
> Thanks.
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