[squid-users] Core dump / xassert on FwdState::unregister (3.5.15)

[squid at peralex.com]

I'm running FreeBSD 9.3-STABLE and Squid 3.5.15 and I'm getting regular
core dumps with the following stack.  Note that I have disabled caching.
 Any suggestions?  I've logged a bug (4467):

#0  0x0000000801b8c96c in thr_kill () from /lib/libc.so.7
#1  0x0000000801c55fcb in abort () from /lib/libc.so.7
#2  0x00000000005d2545 in xassert (msg=0x8b8816 "serverConnection() ==
conn", file=0x8b8513 "FwdState.cc", line=447) at debug.cc:544
#3  0x00000000005fb184 in FwdState::unregister (this=0x80be1e258,
conn=@0x80be164c8) at FwdState.cc:447
#4  0x000000000061fcec in HttpStateData::processReplyBody
(this=0x80be16418) at http.cc:1447
#5  0x0000000000627e8c in HttpStateData::processReply (this=0x80be16418)
at http.cc:1241
#6  0x00000000006284c8 in HttpStateData::readReply (this=0x80be16418,
io=@0x80bff3008) at http.cc:1213
#7  0x00000000006291da in CommCbMemFunT<HttpStateData,
CommIoCbParams>::doDial (this=0x80bff2ff0) at CommCalls.h:205
#8  0x0000000000629b9c in JobDialer<HttpStateData>::dial
(this=0x80bff2ff0, call=@0x80bff2fc0) at AsyncJobCalls.h:174
#9  0x0000000000629ddd in AsyncCallT<CommCbMemFunT<HttpStateData,
CommIoCbParams> >::fire (this=0x80bff2fc0) at AsyncCall.h:145
#10 0x0000000000792345 in AsyncCall::make (this=0x80bff2fc0) at
AsyncCall.cc:40
#11 0x000000000079704b in AsyncCallQueue::fireNext (this=0x809fffa70) at
AsyncCallQueue.cc:56
#12 0x000000000079722f in AsyncCallQueue::fire (this=0x809fffa70) at
AsyncCallQueue.cc:42
#13 0x00000000005e8509 in EventLoop::dispatchCalls (this=0x7fffffffe9c0)
at EventLoop.cc:143
#14 0x00000000005e889a in EventLoop::runOnce (this=0x7fffffffe9c0) at
EventLoop.cc:120
#15 0x00000000005e8a59 in EventLoop::run (this=0x7fffffffe9c0) at
EventLoop.cc:82
#16 0x0000000000660af4 in SquidMain (argc=3, argv=0x7fffffffebb0) at
main.cc:1539
#17 0x0000000000660c2c in SquidMainSafe (argc=3, argv=0x7fffffffebb0) at
main.cc:1263
#18 0x0000000000660ebb in main (argc=3, argv=0x7fffffffebb0) at main.cc:1256