[Bug 54365] New: Connection closed by server during file transfer

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54365

            Bug ID: 54365
           Summary: Connection closed by server during file transfer
           Product: Apache httpd-2
           Version: 2.4.3
          Hardware: Sun
                OS: Solaris
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mpm_event
          Assignee: bugs@httpd.apache.org
          Reporter: hadfieldj@gmail.com
    Classification: Unclassified

Apache 2.4.3 - Solaris 10 sparc 64, event-mpm
APR - 1.4.6, APR util 1.4.1

Whilst downloading a file, apache is closing the connection before the transfer
is complete. 

Truss output shows this as each connection is closed before the client
initiates a retry and a partial response is returned:
17543/1:        read(7, " !", 1)                                = 1
17543/1:        lwp_wait(2, 0xFFFFFFFF7FFFF26C)                 = 0
17543/1:        lwp_kill(67, SIGHUP)                            = 0
17543/67:           Received signal #1, SIGHUP, in port_getn() [caught]
17543/67:             siginfo: SIGHUP pid=17543 uid=4001360 code=-1
17543/67:       port_getn(3, 0x100429558, 64, 1, 0xFFFFFFFF727FBA90) Err#4
EINTR
17543/67:       lwp_sigmask(SIG_SETMASK, 0xFFBEE007, 0x0000FFF7) = 0xFFBFFEFF
[0x0000FFFF]
17543/67:       setcontext(0xFFFFFFFF727FB160)
17543/67:       port_dissociate(3, 4, 0x00000006)               = 0
17543/67:       port_dissociate(3, 4, 0x00000005)               = 0
17543/67:       close(6)                                        = 0
17543/67:       close(5)                                        = 0

Symptoms look similar to previous APR related bug:
https://issues.apache.org/bugzilla/show_bug.cgi?id=42580

I'm able to reproduce by starting with StartServers 120, ThreadsPerChild 64,
then starting a single request to download a large file. As apache clears down
the idle threads, the active thread appears to be killed along with the idle
ones.
So far unable to reproduce with StartServers 3, ThreadsPerChild 25.

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