Bug 1404817

Description:- 
 SIGSEV in TunnelStateData::handleConnectResponse() during squid reconfigure and restart

Customer has tried patch from http://bugs.squid-cache.org/show_bug.cgi?id=4406 and it appears to be fixing issue for them.

Customer update:- 

Under Load (~ 100 HTTP requests per minute) squid crashes almost every time on reconfigure '/sbin/squid -k reconfigure'
Reconfiguring without any load doesn't seem to cause any problem.

After some research we found this bug:

http://bugs.squid-cache.org/show_bug.cgi?id=4406

Right now, this patch seems to fix our problem.
Of course we would still like to have an official fix from RHEL, since we do not want to run self compiled software in productive environment.

2016/12/05 16:02:39| Set Current Directory to /var/log/squid
2016/12/05 16:02:39 kid1| Reconfiguring Squid Cache (version 3.5.20)...
2016/12/05 16:02:39 kid1| Closing HTTP port [::]:3130
2016/12/05 16:02:39 kid1| Closing SNMP receiving port [::]:3402
2016/12/05 16:02:39 kid1| Logfile: closing log syslog:local1.info
2016/12/05 16:02:39 kid1| Startup: Initializing Authentication Schemes ...
2016/12/05 16:02:39 kid1| Startup: Initialized Authentication Scheme 'basic'
2016/12/05 16:02:39 kid1| Startup: Initialized Authentication Scheme 'digest'
2016/12/05 16:02:39 kid1| Startup: Initialized Authentication Scheme 'negotiate'
2016/12/05 16:02:39 kid1| Startup: Initialized Authentication Scheme 'ntlm'
2016/12/05 16:02:39 kid1| Startup: Initialized Authentication.
2016/12/05 16:02:39 kid1| Processing Configuration File: /etc/squid/squid.conf (depth 0)
2016/12/05 16:02:39 kid1| Initializing https proxy context
2016/12/05 16:02:39 kid1| Logfile: opening log syslog:local1.info
2016/12/05 16:02:39 kid1| Squid plugin modules loaded: 0
2016/12/05 16:02:39 kid1| Adaptation support is off.
2016/12/05 16:02:39 kid1| Store logging disabled
2016/12/05 16:02:39 kid1| DNS Socket created at [::], FD 8
2016/12/05 16:02:39 kid1| DNS Socket created at 0.0.0.0, FD 10
2016/12/05 16:02:39 kid1| HTCP Disabled.
2016/12/05 16:02:39 kid1| Sending SNMP messages from [::]:3402
2016/12/05 16:02:39 kid1| Finished loading MIME types and icons.
2016/12/05 16:02:39 kid1| Accepting HTTP Socket connections at local=[::]:3130 remote=[::] FD 11 flags=9
2016/12/05 16:02:39 kid1| Accepting SNMP messages on [::]:3402
FATAL: Received Segment Violation...dying.

(gdb) backtrace
#0  0x00007f36b6e261d7 in raise () from /lib64/libc.so.6
#1  0x00007f36b6e278c8 in abort () from /lib64/libc.so.6
#2  0x00007f36ba6d44ce in death(int) ()
#3  <signal handler called>
#4  0x00007f36ba6df064 in TunnelStateData::handleConnectResponse(unsigned long) ()
#5  0x00007f36ba6df2d3 in TunnelStateData::readConnectResponseDone(char*, unsigned long, Comm::Flag, int) ()
#6  0x00007f36ba75dba7 in AsyncCall::make() ()
#7  0x00007f36ba761f72 in AsyncCallQueue::fireNext() ()
#8  0x00007f36ba7623c0 in AsyncCallQueue::fire() ()
#9  0x00007f36ba5e4579 in EventLoop::runOnce() ()
#10 0x00007f36ba5e4668 in EventLoop::run() ()
#11 0x00007f36ba64efb1 in SquidMain(int, char**) ()
#12 0x00007f36ba54699b in main ()