[Bug 209471] Listen queue overflow due to too many sockets stuck in CLOSED state

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209471

kestas <bsd at zuvis.mooo.com> changed:

           What    |Removed                     |Added
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                 CC|                            |bsd at zuvis.mooo.com

--- Comment #23 from kestas <bsd at zuvis.mooo.com> ---
I see [likely] the same issue on 12.0-RELEASE-p8 amd64:

Dec  3 13:46:38 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (26 occurrences)
Dec  3 13:47:43 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (12 occurrences)
Dec  3 13:49:11 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (9 occurrences)
Dec  3 13:50:28 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (12 occurrences)
Dec  3 13:51:31 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (10 occurrences)
Dec  3 13:52:59 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (35 occurrences)
Dec  3 13:54:06 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (13 occurrences)
Dec  3 13:55:11 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (97 occurrences)
Dec  3 13:56:11 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (134 occurrences)
Dec  3 13:57:13 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (169 occurrences)
Dec  3 13:58:17 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (143 occurrences)
Dec  3 13:59:17 jail kernel: sonewconn: pcb 0xfffff8011b2211e8: Listen queue
overflow: 193 already in queue awaiting acceptance (51 occurrences)

It is a virtual machine with jails (one runing wordpress another runing nginx)
on VMware. Once this happens I can't stop affeted jail. Only ungracefull reboot
of the whole virtual machine helps. Likely related to spikes of client
connections.

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