After approx 24 hours I am seeing this error on my squid
3.5.2 with one user connected for testing:
2015/04/11 15:02:58| Logfile: closing log
daemon:/home/cache/var/logs/access.log
2015/04/11 15:02:58| Logfile Daemon: closing log
daemon:/home/cache/var/logs/access.log
2015/04/11 15:02:58| Open FD UNSTARTED 0 stdin
2015/04/11 15:02:58| Open FD UNSTARTED 1 stdout
2015/04/11 15:02:58| Open FD UNSTARTED 2 stderr
2015/04/11 15:02:58| Open FD UNSTARTED 8 DNS Socket
IPv4
2015/04/11 15:02:58| Open FD UNSTARTED 9 IPC UNIX
STREAM Parent
2015/04/11 15:02:58| Squid Cache (Version 3.5.2): Exiting
normally.
2015/04/11 15:06:52| Set Current Directory to
/usr/local/squid/var/cache/squid
2015/04/11 15:06:52| Starting Squid Cache version 3.5.2
for x86_64-unknown-linux-gnu...
2015/04/11 15:06:52| Service Name: squid
2015/04/11 15:06:52| Process ID 2005
2015/04/11 15:06:52| Process Roles: master worker
2015/04/11 15:06:52| With 65536 file descriptors
available
2015/04/11 15:06:52| Initializing IP Cache...
2015/04/11 15:06:52| DNS Socket created at 0.0.0.0, FD 8
2015/04/11 15:06:52| Adding nameserver 8.8.8.8 from
squid.conf
2015/04/11 15:06:52| Adding nameserver 41.78.211.30 from
squid.conf
2015/04/11 15:06:52| Logfile: opening log
daemon:/home/cache/var/logs/access.log
2015/04/11 15:06:52| Logfile Daemon: opening log
/home/cache/var/logs/access.log
2015/04/11 15:06:52| Store logging disabled
2015/04/11 15:06:52| Swap maxSize 358400000 + 9437184 KB,
estimated 28295168 objects
2015/04/11 15:06:52| Target number of buckets: 1414758
2015/04/11 15:06:52| Using 2097152 Store buckets
2015/04/11 15:06:52| Max Mem size: 9437184 KB
2015/04/11 15:06:52| Max Swap size: 358400000 KB
2015/04/11 15:06:52| Rebuilding storage in
/home/cache/var/cache/squid (clean log)
2015/04/11 15:06:52| Using Least Load store dir selection
2015/04/11 15:06:52| Set Current Directory to
/usr/local/squid/var/cache/squid
2015/04/11 15:06:52| Finished loading MIME types and
icons.
2015/04/11 15:06:52| HTCP Disabled.
2015/04/11 15:06:52| Sending SNMP messages from
0.0.0.0:3401
2015/04/11 15:06:52| Squid plugin modules loaded: 0
2015/04/11 15:06:52| Adaptation support is off.
2015/04/11 15:06:52| Accepting HTTP Socket connections at
local=
0.0.0.0:3128
remote=[::] FD 13 flags=9
2015/04/11 15:06:52| Accepting NAT intercepted HTTP
Socket connections at local=
0.0.0.0:3129 remote=[::] FD
14 flags=41
2015/04/11 15:06:52| Accepting SNMP messages on
0.0.0.0:3401
2015/04/11 15:06:52| Done reading
/home/cache/var/cache/squid swaplog (94 entries)
2015/04/11 15:06:52| Finished rebuilding storage from
disk.
2015/04/11 15:06:52| 94 Entries scanned
2015/04/11 15:06:52| 0 Invalid entries.
2015/04/11 15:06:52| 0 With invalid flags.
2015/04/11 15:06:52| 94 Objects loaded.
2015/04/11 15:06:52| 0 Objects expired.
2015/04/11 15:06:52| 0 Objects cancelled.
2015/04/11 15:06:52| 0 Duplicate URLs purged.
2015/04/11 15:06:52| 0 Swapfile clashes avoided.
2015/04/11 15:06:52| Took 0.05 seconds (2036.97
objects/sec).
2015/04/11 15:06:52| Beginning Validation Procedure
2015/04/11 15:06:52| Completed Validation Procedure
2015/04/11 15:06:52| Validated 94 Entries
2015/04/11 15:06:52| store_swap_size = 2000.00 KB
2015/04/11 15:06:53| storeLateRelease: released 0 objects
2015/04/11 15:48:51| WARNING: 1 swapin MD5 mismatches
2015/04/11 15:48:51| Could not parse headers from on disk
object
2015/04/11 15:48:51| BUG 3279: HTTP reply without Date:
2015/04/11 15:48:51| StoreEntry->key:
039CA6C6725D0A9F31B498354995DE50
2015/04/11 15:48:51| StoreEntry->next: 0
2015/04/11 15:48:51| StoreEntry->mem_obj: 0x21ecd40
2015/04/11 15:48:51| StoreEntry->timestamp: -1
2015/04/11 15:48:51| StoreEntry->lastref: 1428763731
2015/04/11 15:48:51| StoreEntry->expires: -1
2015/04/11 15:48:51| StoreEntry->lastmod: -1
2015/04/11 15:48:51| StoreEntry->swap_file_sz: 0
2015/04/11 15:48:51| StoreEntry->refcount: 1
2015/04/11 15:48:51| StoreEntry->flags:
PRIVATE,FWD_HDR_WAIT,VALIDATED
2015/04/11 15:48:51| StoreEntry->swap_dirn: -1
2015/04/11 15:48:51| StoreEntry->swap_filen: -1
2015/04/11 15:48:51| StoreEntry->lock_count: 2
2015/04/11 15:48:51| StoreEntry->mem_status: 0
2015/04/11 15:48:51| StoreEntry->ping_status: 2
2015/04/11 15:48:51| StoreEntry->store_status: 1
2015/04/11 15:48:51| StoreEntry->swap_status: 0
2015/04/11 15:49:55| Could not parse headers from on disk
object
2015/04/11 20:10:06| BUG 3279: HTTP reply without Date:
2015/04/11 20:10:06| StoreEntry->key:
8749EF6C14DB515AA7E09A4ED2019298
2015/04/11 20:10:06| StoreEntry->next: 0
2015/04/11 20:10:06| StoreEntry->mem_obj: 0x224f3f0
2015/04/11 20:10:06| StoreEntry->timestamp: -1
2015/04/11 20:10:06| StoreEntry->lastref: 1428779406
2015/04/11 20:10:06| StoreEntry->expires: -1
2015/04/11 20:10:06| StoreEntry->lastmod: -1
2015/04/11 20:10:06| StoreEntry->swap_file_sz: 0
2015/04/11 20:10:06| StoreEntry->refcount: 1
2015/04/11 20:10:06| StoreEntry->flags:
PRIVATE,FWD_HDR_WAIT,VALIDATED
2015/04/11 20:10:06| StoreEntry->swap_dirn: -1
2015/04/11 20:10:06| StoreEntry->swap_filen: -1
2015/04/11 20:10:06| StoreEntry->lock_count: 2
2015/04/11 20:10:06| StoreEntry->mem_status: 0
2015/04/11 20:10:06| StoreEntry->ping_status: 2
2015/04/11 20:10:06| StoreEntry->store_status: 1
2015/04/11 20:10:06| StoreEntry->swap_status: 0
2015/04/12 03:54:21| Could not parse headers from on disk
object
2015/04/12 03:54:21| BUG 3279: HTTP reply without Date:
2015/04/12 03:54:21| StoreEntry->key:
2664F79F89A842E097DCD721C4417644
2015/04/12 03:54:21| StoreEntry->next: 0
2015/04/12 03:54:21| StoreEntry->mem_obj: 0x23686e0
2015/04/12 03:54:21| StoreEntry->timestamp: -1
2015/04/12 03:54:21| StoreEntry->lastref: 1428807261
2015/04/12 03:54:21| StoreEntry->expires: -1
2015/04/12 03:54:21| StoreEntry->lastmod: -1
2015/04/12 03:54:21| StoreEntry->swap_file_sz: 0
2015/04/12 03:54:21| StoreEntry->refcount: 1
2015/04/12 03:54:21| StoreEntry->flags:
PRIVATE,FWD_HDR_WAIT,VALIDATED
2015/04/12 03:54:21| StoreEntry->swap_dirn: -1
2015/04/12 03:54:21| StoreEntry->swap_filen: -1
2015/04/12 03:54:21| StoreEntry->lock_count: 2
2015/04/12 03:54:21| StoreEntry->mem_status: 0
2015/04/12 03:54:21| StoreEntry->ping_status: 2
2015/04/12 03:54:21| StoreEntry->store_status: 1
2015/04/12 03:54:21| StoreEntry->swap_status: 0
2015/04/12 03:55:24| Could not parse headers from on disk
object
2015/04/12 03:56:24| StoreEntry->swap_status: 0
2015/04/12 03:56:24| assertion failed: store.cc:1885:
"isEmpty()"