[asterisk-bugs] [JIRA] (ASTERISK-26941) ARI WebSocket forcibly closed due to fatal write error on repeated mute/unmute requests

[Colin (JIRA)]

Colin created ASTERISK-26941:
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             Summary: ARI WebSocket forcibly closed due to fatal write error on repeated mute/unmute requests
                 Key: ASTERISK-26941
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-26941
             Project: Asterisk
          Issue Type: New Feature
      Security Level: None
          Components: Resources/res_http_websocket
    Affects Versions: 14.3.0
         Environment: Ubuntu 16.04.2 LTS on Windows Azure VM
            Reporter: Colin
            Severity: Blocker


We're testing a Stasis conference application and seeing forced WebSocket closes from res_http_websocket.c. Testing with SIPp, we're calling mute/unmute asynchronously  for batches of callers (POST /channels/{channelId}/mute). 

We're running with about 60 SIPp connections. Other batch operations (for example move callers between bridges) complete correctly. This issue seems to be specific to mute and unmute commands. 

Asterisk does not crash, but the Stasis app effectively becomes moribund. We're muting and unmuting callers as one group, using async tasks which we marshal before any further requests are sent to ARI. 

We set up a test server to get some forensic information, using SIPp to simulate 60 connections. We are finding that about 10-15 successful mute/unmute operations take place from each group, before the WebSocket and HTTP connections become moribund. I can provide a debug log file. Some salient events that we've picked out when we do a group mute/unmute, however, are:

1) A large number of webocket writes (in the order of n x n, where n is the number of clients being muted/unmuted), like:
[Apr 10 14:36:29] DEBUG[35342] taskprocessor.c: Taskprocessor 'subm:voice_2-00000065' cleared the high water alert.
[Apr 10 14:36:29] DEBUG[35342] res_http_websocket.c: Writing websocket string of length 668
[Apr 10 14:36:29] DEBUG[35342] res_http_websocket.c: Writing websocket text frame, length 668

2) After a small number of successful mute/unmute operations, the websocket faults, and closes
Apr 10 14:36:30] DEBUG[35342] res_http_websocket.c: Closing WS with 1011 because we can't fulfill a write request
[Apr 10 14:36:30] DEBUG[35342] utils.c: Timed out trying to write 
[Apr 10 14:36:30] DEBUG[35342] res_http_websocket.c: WebSocket connection from 'xxx.xxx.xxx.xxx:18133' forcefully closed due to fatal write error 

3) A large number of attempted writes, followed by deactivation of the Stasis application
[Apr 10 14:36:30] DEBUG[35342] res_http_websocket.c: Writing websocket text frame, length 668
[Apr 10 14:36:30] NOTICE[35342] ari/ari_websockets.c: Problem occurred during websocket write to :18133, websocket closed
[Apr 10 14:36:30] WARNING[35340] ari/ari_websockets.c: WebSocket read error: Software caused connection abort
[Apr 10 14:36:30] VERBOSE[35340] stasis/app.c: Deactivating Stasis app 'voice_2'

We can replicate this at will, and we have extensive verbose/debug logs if these are needed.



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