This might be the same crash reported in another thread, or a new one. I noticed it after upgrading from 3.3.11 to 3.5.6.
I'm using negotiate authentication (kerberos). Auth settings: auth_param negotiate program /usr/lib/squid/negotiate_kerberos_auth auth_param negotiate children 80 startup=5 idle=5 auth_param negotiate keep_alive on Logging setting: debug_options ALL,1 29,3 Syslog: Squid Parent: (squid-1) process 24158 exited due to signal 6 with status 0 cache.log: 2015/07/29 19:32:09.728 kid1| User.cc(305) addIp: user 'LinArlene@TUV.GROUP' has been seen at a new IP address (10.144.138.48:58283) 2015/07/29 19:32:11.677 kid1| User.cc(185) cacheCleanup: Cleaning the user cache now 2015/07/29 19:32:11.677 kid1| User.cc(186) cacheCleanup: Current time: 1438169531 2015/07/29 19:32:23 kid1| Set Current Directory to /var/cache/squid 2015/07/29 19:32:23 kid1| Starting Squid Cache version 3.5.6 for i686-pc-linux-gnu... Backtrace: Core was generated by `(squid-1)'. Program terminated with signal 6, Aborted. #0 0xb7792424 in __kernel_vsyscall () (gdb) bt #0 0xb7792424 in __kernel_vsyscall () #1 0xb7372bf1 in raise () from /lib/libc.so.6 #2 0xb73743ce in abort () from /lib/libc.so.6 #3 0xb736b798 in __assert_fail () from /lib/libc.so.6 #4 0x08460627 in hash_remove_link (hid=0x872f098, hl=0xe739580) at hash.cc:240 #5 0x0831dc4a in Auth::User::cacheCleanup (datanotused=0x0) at User.cc:208 #6 0x08226795 in EventDialer::dial (this=0x14f535dc) at event.cc:41 #7 0x08226a2d in AsyncCallT<EventDialer>::fire (this=0x14f535c0) at ../src/base/AsyncCall.h:145 #8 0x0835fa28 in AsyncCall::make (this=0x14f535c0) at AsyncCall.cc:40 #9 0x08362f9f in AsyncCallQueue::fireNext (this=0x872f100) at AsyncCallQueue.cc:56 #10 0x08362d32 in AsyncCallQueue::fire (this=0x872f100) at AsyncCallQueue.cc:42 #11 0x08226f5f in EventLoop::dispatchCalls (this=0xbfaa66c8) at EventLoop.cc:143 #12 0x08226dad in EventLoop::runOnce (this=0xbfaa66c8) at EventLoop.cc:108 #13 0x08226c96 in EventLoop::run (this=0xbfaa66c8) at EventLoop.cc:82 #14 0x0827f753 in SquidMain (argc=1, argv=0xbfaa6844) at main.cc:1511 #15 0x0827eb9f in SquidMainSafe (argc=1, argv=0xbfaa6844) at main.cc:1243 #16 0x0827eb84 in main (argc=1, argv=0xbfaa6844) at main.cc:1236
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