[Bug 204426] Processes terminating cannot access memory

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204426

--- Comment #122 from Robert Blayzor <rblayzor at inoc.net> ---
We are still seeing a problem with servers getting hosed up with hundreds and
hundreds of sockets in a CLOSED state...  I've experienced this with two
different Apache2.4 servers... Both times, almost identical issue...

dmesg
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (34 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (39 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (36 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (37 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (42 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (38 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (39 occurrences)
sonewconn: pcb 0xfffff80001b34000: Listen queue overflow: 767 already in queue
awaiting acceptance (36 occurrences)
...


webmail3 [~] netstat -an | grep " CLOSED"
tcp4     113      0 127.0.0.1.80           127.0.0.1.14511        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.26064        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.57807        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.39385        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.22623        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.65280        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.27494        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.12996        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.59834        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.32036        CLOSED
tcp4     113      0 127.0.0.1.80           127.0.0.1.34364        CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.35467 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.28605 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.21232 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.48099 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.65026 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.54254 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.35803 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.11435 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.46650 CLOSED
tcp6       0      0 2607:f058:110:3:.80    2607:f058:110:3:.7447  CLOSED
...


webmail3 [~] netstat -an | grep " CLOSED" | wc -l
     980


webmail3 [~] sudo procstat -at | grep httpd
          699 100076 httpd            -                  0  120 sleep   select
          755 100093 httpd            -                  3  120 sleep   pipewr
         4220 100124 httpd            -                  3  120 sleep   pipewr
         6812 100448 httpd            -                  2  120 sleep   pipewr
        18402 100112 httpd            -                  0  120 sleep   pipewr
        24419 100122 httpd            -                  3  120 sleep   pipewr
        24590 100142 httpd            -                  2  120 sleep   pipewr
        24591 100431 httpd            -                  3  120 sleep   pipewr
        24592 100095 httpd            -                  2  120 sleep   pipewr
        24593 100432 httpd            -                  0  120 sleep   pipewr
        24594 100134 httpd            -                  2  120 sleep   pipewr
        24595 100052 httpd            -                  3  120 sleep   pipewr
        24596 100128 httpd            -                  2  120 sleep   pipewr
        24597 100062 httpd            -                  2  120 sleep   pipewr
        24598 100047 httpd            -                  3  120 sleep   pipewr
        24599 100073 httpd            -                  2  120 sleep   pipewr
        24600 100129 httpd            -                  0  120 sleep   pipewr
...

webmail3 [~] sudo procstat -at | grep httpd | wc -l
     201

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