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Listen queue overflow: 193 already in queue awaiting acceptance

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hokan

Member
Joined
Feb 10, 2017
Messages
42
Using the new UI to delete several hundred snapshots caused the UI to become unresponsive. After some hours, the UI becomes responsive again.

Messages like this appear in the log:
Apr 2 19:06:15 enet-rascal-1 kernel: sonewconn: pcb 0xfffff80b3e782a50: Listen queue overflow: 193 already in queue awaiting acceptance (45 occurrences)

This give two clues: the pcb number and the overflow number.

# netstat -Lan | egrep "(Proto|193)"
Proto Listen Local Address
unix 193/0/128 /var/run/middlewared.sock

and

# netstat -a | grep fffff80b3e782a50
fffff80b3e782a50 stream 0 0 fffff80919987938 0 0 0 /var/run/middlewared.sock


So something associated with middlewared.sock is having trouble keeping up.

I will make a bug report once my UI becomes responsive again after my last test, but I know that others have had trouble with exploring "Listen queue overflow" problems and so I thought it worthwhile to post here my experience.
 

Apollo

Neophyte Sage
Joined
Jun 13, 2013
Messages
1,265
Deleting snapshot can take a while depending on the type of data it points to. Maybe the GUI is freezing as a result until deletion is complete.
 

hokan

Member
Joined
Feb 10, 2017
Messages
42
Bug report is here. Private for now.
 

hokan

Member
Joined
Feb 10, 2017
Messages
42
And less than 24 hours later they've got a proposed patch!

Whoa!
 
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