Nextcloud crash when running xcauth

[nk86]

Dear all,
I installed Nextcloud 17.0 on nginx and php-fpm with ejabberd 18.01 and xcauth 2.0.3+. The OS is Ubuntu 18.04.3 LTS on a RockPro64 ARM SBC. Nextcloud and ejabberd are working fine. When I start xcauth I can login in ejabberd with the Nextcloud accounts. The communication with the bosh interface works fine as well. Xcauth reports in its log file that authentication worked.

However, after some minutes I cannot login in Nextcloud anymore. After submitting the password it will freeze at "logging in". After killing or restarting the xcauth service I'm able to login again until it crashes the next time. When I managed to login I can also not access ejabberd accounts from Nextcloud. The ejabberd log file always reports that the username or password is invalid. Still, the main problem is that Nextcloud does not work at all when xcauth crashed.

Sometimes there is also a python exception in xcauth.err:
File "/usr/lib/dist-packages/xclib/authops.py", line 107, in perform s.listen()
OSError: [Errno 88] Socket operation on non-socket

During handling of the above exception, another exception occured:

Traceback (most recent call last):
File "/usr/sbin/xcauth", line 17, in perform(args)
File "/usr/lib/python3/dist-packages/xclib/authops.py", line 112, in perform perform_from_fd(sys.stdin, sys.stdout, xc, args.type, closefds=(sys.stdin, sys.stdout,s))
File "/usr/lib/python3/dist-packages/xclib/authops.py", line 175, in perform_from_fd
for data in smtp.read.request(infd, outfd):
File "/usr/lib/python3/dist-packages/xclib/ejabberd_io.py", line 15, in read_request line = infd.read(2)

Can you please help me to make run Nextcloud together with xcauth?

[nkrupp]

I did some debugging and the problem is that only every second nextcloud login is successful. When pressing the login button first it will show "logging in" forever. If I reload the page and press it again it will login without any problems. There is an exception in the javascript log:

main.js?v=496616e2-15:396 JQMIGRATE: Migrate is installed, version 1.4.1
main.js?v=496616e2-15:1095 oc_config is deprecated: use OC.config instead
He @ main.js?v=496616e2-15:1095
main.js?v=496616e2-15:1095 oc_appswebroots is deprecated: use OC.appswebroots instead
He @ main.js?v=496616e2-15:1095
main.js?v=496616e2-15:1095 oc_config is deprecated: use OC.config instead
He @ main.js?v=496616e2-15:1095
main.js?v=496616e2-15:1095 oc_appswebroots is deprecated: use OC.appswebroots instead
He @ main.js?v=496616e2-15:1095
jsxc.min.js?v=496616e2-15:1 State changed to INITIATING
jsxc.min.js?v=496616e2-15:1 Try to relogin
jsxc.min.js?v=496616e2-15:1 Logout was forced or I found no valid jid
jsxc.min.js?v=496616e2-15:1 State changed to TRYTOINTERCEPT
jsxc.min.js?v=496616e2-15:1 State changed to INTERCEPTED
jsxc.min.js?v=496616e2-15:1 Variable serverType doesn't exist. It was created.
jsxc.min.js?v=496616e2-15:1 Variable loginForm doesn't exist. It was created.
jsxc.min.js?v=496616e2-15:1 Uncaught TypeError: Converting circular structure to JSON
--> starting at object with constructor 's'
--- property '_renderProxy' closes the circle
at JSON.stringify ()
at Object.setItem (jsxc.min.js?v=496616e2-15:1)
at Object.updateItem (jsxc.min.js?v=496616e2-15:1)
at Object.jsxc.options.set (jsxc.min.js?v=496616e2-15:1)
at Object. (jsxc.min.js?v=496616e2-15:1)
at Function.each (main.js?v=496616e2-15:14)
at Object._prepareLogin (jsxc.min.js?v=496616e2-15:1)
at jsxc.min.js?v=496616e2-15:1
at Object.success (ojsxc.js?v=496616e2-15:247)
at u (main.js?v=496616e2-15:25)
DevTools failed to parse SourceMap: https://my.domain/apps/ojsxc/js/jsxc/jsxc.min.js.map
DevTools failed to parse SourceMap: https://my.domain/core/js/dist/main.js.map
DevTools failed to parse SourceMap: https://my.domain/apps/ojsxc/js/jsxc/lib/jsxc.dep.min.js.map
DevTools failed to parse SourceMap: https://my.domain/core/js/dist/share_backend.js.map
DevTools failed to parse SourceMap: https://my.domain/core/js/dist/login.js.map

It only happens when xcauth is running.