I compiled under RedHat 6.2 version of squid 3.1.15 that works fine but when I compiled the new version 3.1.20, I got a drop in the authentication phase of the process 2012/07/19 09:55:54.906| authenticateValidateUser: Validating Auth_user request '0x7f93d218bc00'. vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv FATAL: Received Segment Violation...dying. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 2012/07/19 09:55:54.906| storeDirWriteCleanLogs: Starting... 2012/07/19 09:55:54.906| file_open: FD 14 2012/07/19 09:55:54.906| fd_open() FD 14 /var/spool/squid/swap.state.clean 2012/07/19 09:55:54.906| storeDirWriteCleanLogs: opened /var/spool/squid/swap.state.clean, FD 14 2012/07/19 09:55:54.906| cbdataFree: 0x7f93d218dd48 2012/07/19 09:55:54.906| cbdataFree: Freeing 0x7f93d218dd48 2012/07/19 09:55:54.906| file_close: FD 8 really closing 2012/07/19 09:55:54.906| fd_close FD 8 /var/spool/squid/swap.state 2012/07/19 09:55:54.906| commSetSelect(FD 8,type=1,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| commSetSelect(FD 8,type=2,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| Cache Dir #0 log closed on FD 8 2012/07/19 09:55:54.906| xrename: renaming /var/spool/squid/swap.state.clean to /var/spool/squid/swap.state 2012/07/19 09:55:54.906| file_open: FD 8 2012/07/19 09:55:54.906| fd_open() FD 8 /var/spool/squid/swap.state.last-clean 2012/07/19 09:55:54.906| file_close: FD 8 really closing 2012/07/19 09:55:54.906| fd_close FD 8 /var/spool/squid/swap.state.last-clean 2012/07/19 09:55:54.906| commSetSelect(FD 8,type=1,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| commSetSelect(FD 8,type=2,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| file_close: FD 14 really closing 2012/07/19 09:55:54.906| fd_close FD 14 /var/spool/squid/swap.state.clean 2012/07/19 09:55:54.906| commSetSelect(FD 14,type=1,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| commSetSelect(FD 14,type=2,handler=0,client_data=0,timeout=0) 2012/07/19 09:55:54.906| Finished. Wrote 176 entries. 2012/07/19 09:55:54.906| Took 0.00 seconds (442211.06 entries/sec). CPU Usage: 8.012 seconds = 3.643 user + 4.368 sys Maximum Resident Size: 178016 KB Page faults with physical i/o: 1 Memory usage for squid via mallinfo(): total space in arena: 3456 KB Ordinary blocks: 3399 KB 8 blks Small blocks: 0 KB 10 blks Holding blocks: 137884 KB 10 blks Free Small blocks: 0 KB Free Ordinary blocks: 56 KB Total in use: 141283 KB 4088% Total free: 56 KB 2% I use NTLM authorization with ActiveDirectory Both versions comiled with options: ]# squid -v Squid Cache: Version 3.1.20 configure options: '--host=x86_64-unknown-linux-gnu' '--build=x86_64-unknown-linux-gnu' '--program-prefix=' '--prefix=/usr' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--sharedstatedir=/var/lib' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--exec_prefix=/usr' '--libexecdir=/usr/lib64/squid' '--localstatedir=/var' '--datadir=/usr/share/squid' '--sysconfdir=/etc/squid' '--with-logdir=$(localstatedir)/log/squid' '--with-pidfile=$(localstatedir)/run/squid.pid' '--disable-dependency-tracking' '--enable-arp-acl' '--enable-follow-x-forwarded-for' '--enable-auth=basic,digest,ntlm,negotiate' '--enable-basic-auth-helpers=LDAP,MSNT,NCSA,PAM,SMB,YP,getpwnam,multi-domain-NTLM,SASL,DB,POP3,squid_radius_auth' '--enable-ntlm-auth-helpers=smb_lm,no_check,fakeauth' '--enable-digest-auth-helpers=password,ldap,eDirectory' '--enable-negotiate-auth-helpers=squid_kerb_auth' '--enable-external-acl-helpers=ip_user,ldap_group,session,unix_group,wbinfo_group' '--enable-cache-digests' '--enable-cachemgr-hostname=localhost' '--enable-delay-pools' '--enable-epoll' '--enable-icap-client' '--enable-ident-lookups' '--enable-linux-netfilter' '--enable-referer-log' '--enable-removal-policies=heap,lru' '--enable-snmp' '--enable-ssl' '--enable-storeio=aufs,diskd,ufs' '--enable-useragent-log' '--enable-wccpv2' '--enable-esi' '--with-aio' '--with-default-user=squid' '--with-filedescriptors=262144' '--with-dl' '--with-openssl' '--with-pthreads' '--disable-optimizations' 'build_alias=x86_64-unknown-linux-gnu' 'host_alias=x86_64-unknown-linux-gnu' 'CFLAGS=-O2 -g -fpie' 'LDFLAGS=-pie' 'CXXFLAGS=-O2 -g -fpie' --with-squid=/home/asmyasni/src/rpm/BUILD/squid-3.1.20 no coredumps appears I can't debug this problem --