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https://issues.apache.org/jira/browse/GUACAMOLE-194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15847254#comment-15847254
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Michael Jumper commented on GUACAMOLE-194:
------------------------------------------
{quote}
We are heavy users of the RDP feature with SSH/SFTP for file downloads and
uploads. We are seeing frequent guacd crashes, even the first session log off
can cause a crash.
{quote}
In this particular instance, the segfault due to the invalid {{free()}} is
occurring when the connection is being cleaned up and has already been
disconnected for other reasons. It needs to be fixed, for sure, but it should
have zero affect on connection stability as each connection is isolated to its
own process.
Do you have the logs from guacd when this occurs?
{quote}
After a few sessions (Sometimes hundreds, often thousands) the container
becomes unstable, causes very high system load and no new connections via
guacamole are possible.
{quote}
Are all these sessions RDP? What are the specifications of your server?
{quote}
We typically also see the virtual docker Ethernet adapter enter the disabled
state.
{quote}
This is troubling. I've never heard of Docker's internal networking simply
dying.
> Double memory free bug / or thread-unsafeness in guacd, called in the
> guac_common_ssh_destroy_user function
> -----------------------------------------------------------------------------------------------------------
>
> Key: GUACAMOLE-194
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-194
> Project: Guacamole
> Issue Type: Bug
> Components: guacd
> Affects Versions: 0.9.10-incubating
> Environment: guacd docker container on ubuntu and debian
> Reporter: Robin
> Attachments: guacd-stack trace.txt
>
>
> We are heavy users of the RDP feature with SSH/SFTP for file downloads and
> uploads. We are seeing frequent guacd crashes, even the first session log
> off can cause a crash.
> After a few sessions (Sometimes hundreds, often thousands) the container
> becomes unstable, causes very high system load and no new connections via
> guacamole are possible. We typically also see the virtual docker Ethernet
> adapter enter the disabled state.
> {code:none|title=https://github.com/apache/incubator-guacamole-server/blob/d831a4b9dfee685d2c00f83dabff59d0be917496/src/common-ssh/guac_ssh_user.c}
> void guac_common_ssh_destroy_user(guac_common_ssh_user* user) {
> /* Free private key, if present */
> if (user->private_key != NULL)
> guac_common_ssh_key_free(user->private_key);
> /* Free all other data */
> free(user->password);
> free(user->username);
> free(user);
> }
> {code}
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