this error has occurred several times over the past day in an application which has been in service, unchanged, for weeks.
one possible difference is that the it may have been presented with queries which have a higher operator count and thereby involve more threads, but it is not yet possible to quantify that difference.
$ sbcl --version
SBCL 1.0.46
$ uname -a
Linux nxp-qa 3.5.0-48-generic #72-Ubuntu SMP Mon Mar 10 23:18:29 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
we have yet to move from 1.0.46 as there has been no response to #1292673
$ sbcl --core sbcl-spocq.core
This is SBCL 1.0.46, an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.
SBCL is free software, provided as is, with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses. See the CREDITS and COPYING files in the
distribution for more information.
* *features*
(:BORDEAUX-THREADS :WILBUR2 :WILBUR :CL-PPCRE :SB-BSD-SOCKETS-ADDRINFO
:CLOSER-MOP :DE.SETF.UTILITY.TEST CFFI-FEATURES:FLAT-NAMESPACE
CFFI-FEATURES:X86-64 CFFI-FEATURES:UNIX :CFFI CFFI-SYS::FLAT-NAMESPACE
:LITTLE-ENDIAN :THREAD-SUPPORT :WILBUR-TRIPLES-AS-CLASSES
:RDFCACHE-NATIVE-INTEGERS :ASDF.HIERARCHICAL-NAMES :DE.SETF.UTILITY :ASDF2
:ASDF :ANSI-CL :COMMON-LISP :SBCL :SB-DOC :SB-TEST :SB-LDB :SB-PACKAGE-LOCKS
:SB-UNICODE :SB-EVAL :SB-SOURCE-LOCATIONS :IEEE-FLOATING-POINT :X86-64 :UNIX
:ELF :LINUX :SB-THREAD :LARGEFILE :GENCGC :STACK-GROWS-DOWNWARD-NOT-UPWARD
:C-STACK-IS-CONTROL-STACK :LINKAGE-TABLE :COMPARE-AND-SWAP-VOPS
:UNWIND-TO-FRAME-AND-CALL-VOP :RAW-INSTANCE-INIT-VOPS
:STACK-ALLOCATABLE-CLOSURES :STACK-ALLOCATABLE-VECTORS
:STACK-ALLOCATABLE-LISTS :STACK-ALLOCATABLE-FIXED-OBJECTS :ALIEN-CALLBACKS
:CYCLE-COUNTER :COMPLEX-FLOAT-VOPS :FLOAT-EQL-VOPS :INLINE-CONSTANTS
:MEMORY-BARRIER-VOPS :OS-PROVIDES-DLOPEN :OS-PROVIDES-DLADDR
:OS-PROVIDES-PUTWC :OS-PROVIDES-SUSECONDS-T :OS-PROVIDES-GETPROTOBY-R
:OS-PROVIDES-POLL)
*
stacktrace :
0: (SB-DEBUG::MAP-BACKTRACE #<CLOSURE (LAMBDA (ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::FRAME)) {101F1A1999}> :START 0 :COUNT 1152921504606846975)
1: (ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PRINT-STACKTRACE #<SB-SYS:FD-STREAM for "file /var/tmp/logs/spocq.log" {101EF50001}> :START 0 :COUNT 1152921504606846975 :VERBOSITY 1 :PRINT-ARRAY
NIL :PRINT-PRETTY NIL)
2: ((FLET SB-THREAD::WITH-MUTEX-THUNK))
3: ((FLET #:WITHOUT-INTERRUPTS-BODY-[CALL-WITH-MUTEX]300))
4: (SB-THREAD::CALL-WITH-MUTEX #<CLOSURE (FLET SB-THREAD::WITH-MUTEX-THUNK) {7FFF9FDAC5C9}> #S(SB-THREAD:MUTEX :NAME "trace lock" :%OWNER #<SB-THREAD:THREAD "algebra-dynamic-369178"
RUNNING {101EB470A1}> :STATE 1) #<SB-THREAD:THREAD "algebra-dynamic-369178" RUNNING {101EB470A1}> T)
5: ((FLET ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::CALL-WRITE-LOG))
6: ((FLET ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::HANDLE-ERROR) #<SB-INT:INVALID-ARRAY-INDEX-ERROR expected-type: (INTEGER 0 (64)) datum: 82>)
7: ((FLET #:FORM-FUN-[GUARDED-HANDLER]628))
8: ((FLET ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::GUARDED-HANDLER) #<SB-INT:INVALID-ARRAY-INDEX-ERROR expected-type: (INTEGER 0 (64)) datum: 82>)
9: (SIGNAL #<SB-INT:INVALID-ARRAY-INDEX-ERROR expected-type: (INTEGER 0 (64)) datum: 82>)
10: (ERROR SB-INT:INVALID-ARRAY-INDEX-ERROR :ARRAY #<(SIMPLE-ARRAY (UNSIGNED-BYTE 64) (64)) {10009954EF}> :AXIS NIL :DATUM 82 :EXPECTED-TYPE (INTEGER 0 (64)))
11: (SB-INT:INVALID-ARRAY-INDEX-ERROR #<(SIMPLE-ARRAY (UNSIGNED-BYTE 64) (64)) {10009954EF}> 82 64 NIL)
12: (SB-KERNEL::INVALID-ARRAY-INDEX-ERROR-HANDLER #<unavailable argument> #.(SB-SYS:INT-SAP #X7FFF9FDAD580) #<SB-ALIEN-INTERNALS:ALIEN-VALUE :SAP #X7FFF9FDACF40 :TYPE (* (STRUCT
SB-VM::OS-CONTEXT-T-STRUCT))> (533 148 84))
13: (SB-KERNEL:INTERNAL-ERROR #.(SB-SYS:INT-SAP #X7FFF9FDACF40) #<unavailable argument>)
14: ("foreign function: call_into_lisp")
15: ("foreign function: funcall2")
16: ("foreign function: interrupt_internal_error")
17: ("foreign function: #x41107A")
18: ((FLET #:BODY-FUN-[%PUTHASH]316))
19: (SB-KERNEL:%PUTHASH #<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}> #<HASH-TABLE :TEST EQL :COUNT 63 {10004DA851}> ((:FLUSH
#<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS
ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH
#<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS
ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH
#<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS
ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>) (:FLUSH #<SB-PCL::WRAPPER #<STANDARD-CLASS ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX> {101EC57601}>)))
20: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK))
21: ((FLET #:WITHOUT-INTERRUPTS-BODY-[CALL-WITH-RECURSIVE-LOCK]324))
22: (SB-THREAD::CALL-WITH-RECURSIVE-LOCK #<CLOSURE (FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK) {7FFF9FDAD899}> #S(SB-THREAD:MUTEX :NAME "World Lock" :%OWNER #<SB-THREAD:THREAD
"algebra-dynamic-369178" RUNNING {101EB470A1}> :STATE 2))
23: (SB-PCL::CHECK-WRAPPER-VALIDITY #<ORG.DATAGRAPH.SPOCQ.IMPLEMENTATION::PAGE-MAILBOX [[64:0/0/]x0.0@IO: (pt ptgraph ptName)] (ORG.DATAGRAPH.SPOCQ.ALGEBRA:|join| .
"59ff9eb4-faea-4b6a-a53d-72805d352c83") {1013FD1E71}>)
Are you modifying hash-tables concurrently?