/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 11:33:44,472 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 11:33:44,475 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 11:33:44,530 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 11:33:44,531 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 11:33:44,535 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 11:33:44,538 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 11:33:44,553 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 11:33:44,557 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 11:33:44,563 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 11:33:44,567 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 11:33:44,568 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 11:33:44,568 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 11:33:44,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 11:33:44,574 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 11:33:44,575 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 11:33:44,576 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 11:33:44,580 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 11:33:44,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 11:33:44,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 11:33:44,595 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 11:33:44,598 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 11:33:44,599 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 11:33:44,602 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 11:33:44,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 11:33:44,629 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 11:33:44,630 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 11:33:44,631 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 11:33:44,633 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 11:33:44,660 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 11:33:44,660 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 11:33:44,662 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 11:33:44,662 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 11:33:44,662 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 11:33:44,662 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 11:33:44,663 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 11:33:44,663 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 11:33:44,663 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 11:33:44,663 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 11:33:44,663 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 11:33:44,664 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 11:33:44,664 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 11:33:44,664 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 11:33:44,664 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 11:33:44,664 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 11:33:44,665 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 11:33:44,665 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 11:33:44,665 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 11:33:44,665 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 11:33:44,665 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 11:33:44,666 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 11:33:44,666 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 11:33:44,666 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 11:33:44,666 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 11:33:44,666 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 11:33:45,021 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 11:33:45,048 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 11:33:45,052 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 11:33:45,053 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 11:33:45,058 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 11:33:45,059 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c [2021-01-06 11:33:45,136 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0cf10656a/14fa15eeb9da454f85256f54d302af52/FLAG3b4b8a611 [2021-01-06 11:33:45,707 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 11:33:45,708 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c [2021-01-06 11:33:45,717 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0cf10656a/14fa15eeb9da454f85256f54d302af52/FLAG3b4b8a611 [2021-01-06 11:33:46,073 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/0cf10656a/14fa15eeb9da454f85256f54d302af52 [2021-01-06 11:33:46,082 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 11:33:46,085 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 11:33:46,090 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 11:33:46,090 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 11:33:46,095 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 11:33:46,096 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@12256f2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46, skipping insertion in model container [2021-01-06 11:33:46,099 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,112 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 11:33:46,134 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 11:33:46,356 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c[387,400] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~in~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~in~0,],[IntegerLiteral[10]]] left hand side expression in assignment: lhs: VariableLHS[~idx_in~0,] left hand side expression in assignment: lhs: VariableLHS[~s~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] [2021-01-06 11:33:46,389 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 11:33:46,397 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 11:33:46,412 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/bitvector-loops/verisec_sendmail_tTflag_arr_one_loop.c[387,400] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#in~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#in~0,],offset],IdentifierExpression[~i~0,]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#in~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[10],StructAccessExpression[IdentifierExpression[~#in~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~idx_in~0,] left hand side expression in assignment: lhs: VariableLHS[~s~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~c~0,] [2021-01-06 11:33:46,438 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 11:33:46,457 INFO L208 MainTranslator]: Completed translation [2021-01-06 11:33:46,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46 WrapperNode [2021-01-06 11:33:46,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 11:33:46,460 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 11:33:46,460 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 11:33:46,460 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 11:33:46,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,480 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,510 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 11:33:46,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 11:33:46,514 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 11:33:46,514 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 11:33:46,524 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,537 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,538 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,543 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,549 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... [2021-01-06 11:33:46,551 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 11:33:46,552 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 11:33:46,552 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 11:33:46,552 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 11:33:46,553 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 11:33:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 11:33:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 11:33:46,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 11:33:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 11:33:46,658 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 11:33:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 11:33:46,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 11:33:46,928 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 11:33:46,928 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-01-06 11:33:46,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 11:33:46 BoogieIcfgContainer [2021-01-06 11:33:46,932 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 11:33:46,936 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 11:33:46,937 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 11:33:46,948 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 11:33:46,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 11:33:46" (1/3) ... [2021-01-06 11:33:46,949 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3388dc35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 11:33:46, skipping insertion in model container [2021-01-06 11:33:46,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:33:46" (2/3) ... [2021-01-06 11:33:46,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3388dc35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 11:33:46, skipping insertion in model container [2021-01-06 11:33:46,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 11:33:46" (3/3) ... [2021-01-06 11:33:46,956 INFO L111 eAbstractionObserver]: Analyzing ICFG verisec_sendmail_tTflag_arr_one_loop.c [2021-01-06 11:33:46,976 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 11:33:46,989 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 11:33:47,047 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 11:33:47,075 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 11:33:47,075 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 11:33:47,075 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 11:33:47,075 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 11:33:47,075 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 11:33:47,076 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 11:33:47,076 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 11:33:47,076 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 11:33:47,091 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2021-01-06 11:33:47,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-01-06 11:33:47,097 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:47,098 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:47,098 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:47,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:47,105 INFO L82 PathProgramCache]: Analyzing trace with hash 212076531, now seen corresponding path program 1 times [2021-01-06 11:33:47,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:47,116 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379141918] [2021-01-06 11:33:47,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:47,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:47,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:33:47,301 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379141918] [2021-01-06 11:33:47,302 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 11:33:47,303 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 11:33:47,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741679007] [2021-01-06 11:33:47,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 11:33:47,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:47,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 11:33:47,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 11:33:47,326 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 3 states. [2021-01-06 11:33:47,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:47,372 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2021-01-06 11:33:47,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 11:33:47,375 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2021-01-06 11:33:47,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:47,384 INFO L225 Difference]: With dead ends: 35 [2021-01-06 11:33:47,384 INFO L226 Difference]: Without dead ends: 17 [2021-01-06 11:33:47,387 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 11:33:47,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-01-06 11:33:47,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 11. [2021-01-06 11:33:47,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2021-01-06 11:33:47,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-01-06 11:33:47,421 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2021-01-06 11:33:47,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:47,422 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-01-06 11:33:47,422 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 11:33:47,422 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-01-06 11:33:47,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 11:33:47,423 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:47,423 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:47,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 11:33:47,424 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:47,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:47,425 INFO L82 PathProgramCache]: Analyzing trace with hash 1435974389, now seen corresponding path program 1 times [2021-01-06 11:33:47,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:47,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138006645] [2021-01-06 11:33:47,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:47,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:47,478 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:33:47,479 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138006645] [2021-01-06 11:33:47,479 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242930459] [2021-01-06 11:33:47,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:47,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:47,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 11:33:47,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:47,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:33:47,637 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:47,637 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 11:33:47,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933375575] [2021-01-06 11:33:47,639 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 11:33:47,639 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:47,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 11:33:47,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 11:33:47,641 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 5 states. [2021-01-06 11:33:47,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:47,682 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-01-06 11:33:47,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 11:33:47,683 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2021-01-06 11:33:47,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:47,684 INFO L225 Difference]: With dead ends: 25 [2021-01-06 11:33:47,684 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 11:33:47,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 11:33:47,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 11:33:47,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 13. [2021-01-06 11:33:47,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 11:33:47,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-01-06 11:33:47,690 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2021-01-06 11:33:47,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:47,690 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-01-06 11:33:47,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 11:33:47,690 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-01-06 11:33:47,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 11:33:47,691 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:47,691 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:47,905 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 11:33:47,906 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:47,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:47,908 INFO L82 PathProgramCache]: Analyzing trace with hash 780776823, now seen corresponding path program 2 times [2021-01-06 11:33:47,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:47,909 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450102565] [2021-01-06 11:33:47,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:47,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:48,008 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 11:33:48,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450102565] [2021-01-06 11:33:48,009 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 11:33:48,009 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 11:33:48,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661509263] [2021-01-06 11:33:48,010 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 11:33:48,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:48,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 11:33:48,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-01-06 11:33:48,011 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2021-01-06 11:33:48,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:48,076 INFO L93 Difference]: Finished difference Result 18 states and 19 transitions. [2021-01-06 11:33:48,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 11:33:48,076 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2021-01-06 11:33:48,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:48,077 INFO L225 Difference]: With dead ends: 18 [2021-01-06 11:33:48,077 INFO L226 Difference]: Without dead ends: 14 [2021-01-06 11:33:48,078 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 11:33:48,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-01-06 11:33:48,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-01-06 11:33:48,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 11:33:48,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-01-06 11:33:48,082 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2021-01-06 11:33:48,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:48,082 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-01-06 11:33:48,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 11:33:48,082 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-01-06 11:33:48,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-01-06 11:33:48,083 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:48,083 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:48,083 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 11:33:48,083 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:48,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:48,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1564056878, now seen corresponding path program 1 times [2021-01-06 11:33:48,084 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:48,085 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204631500] [2021-01-06 11:33:48,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:48,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:48,161 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 11:33:48,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204631500] [2021-01-06 11:33:48,162 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2147363826] [2021-01-06 11:33:48,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:48,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:48,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 11:33:48,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:48,282 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 11:33:48,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:48,283 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 11:33:48,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632896373] [2021-01-06 11:33:48,284 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 11:33:48,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:48,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 11:33:48,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 11:33:48,286 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 6 states. [2021-01-06 11:33:48,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:48,353 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-01-06 11:33:48,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 11:33:48,356 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2021-01-06 11:33:48,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:48,357 INFO L225 Difference]: With dead ends: 24 [2021-01-06 11:33:48,357 INFO L226 Difference]: Without dead ends: 17 [2021-01-06 11:33:48,358 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 11:33:48,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-01-06 11:33:48,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-01-06 11:33:48,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-01-06 11:33:48,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-01-06 11:33:48,366 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 13 [2021-01-06 11:33:48,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:48,366 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-01-06 11:33:48,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 11:33:48,367 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-01-06 11:33:48,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 11:33:48,368 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:48,369 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:48,583 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:48,584 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:48,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:48,585 INFO L82 PathProgramCache]: Analyzing trace with hash 71614736, now seen corresponding path program 2 times [2021-01-06 11:33:48,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:48,586 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248957670] [2021-01-06 11:33:48,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:48,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:48,704 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 11:33:48,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248957670] [2021-01-06 11:33:48,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047653559] [2021-01-06 11:33:48,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:48,794 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:33:48,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:33:48,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 11:33:48,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:48,857 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 11:33:48,858 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:48,858 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 11:33:48,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944216303] [2021-01-06 11:33:48,859 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 11:33:48,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:48,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 11:33:48,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 11:33:48,862 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 7 states. [2021-01-06 11:33:48,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:48,937 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-01-06 11:33:48,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 11:33:48,937 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2021-01-06 11:33:48,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:48,939 INFO L225 Difference]: With dead ends: 26 [2021-01-06 11:33:48,939 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 11:33:48,940 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 11:33:48,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 11:33:48,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-01-06 11:33:48,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 11:33:48,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-01-06 11:33:48,945 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 15 [2021-01-06 11:33:48,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:48,945 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-01-06 11:33:48,945 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 11:33:48,945 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-01-06 11:33:48,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 11:33:48,946 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:48,946 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:49,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:49,161 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:49,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:49,163 INFO L82 PathProgramCache]: Analyzing trace with hash -5994546, now seen corresponding path program 3 times [2021-01-06 11:33:49,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:49,164 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52330666] [2021-01-06 11:33:49,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:49,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:49,328 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 11:33:49,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52330666] [2021-01-06 11:33:49,330 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773400421] [2021-01-06 11:33:49,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:49,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-01-06 11:33:49,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:33:49,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 11:33:49,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:49,548 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2021-01-06 11:33:49,569 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2021-01-06 11:33:49,789 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 11:33:49,797 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 11:33:49,804 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 11:33:49,823 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 11:33:49,823 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:49,823 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2021-01-06 11:33:49,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168371950] [2021-01-06 11:33:49,832 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 11:33:49,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:49,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 11:33:49,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-01-06 11:33:49,835 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2021-01-06 11:33:50,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:50,004 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2021-01-06 11:33:50,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 11:33:50,005 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 17 [2021-01-06 11:33:50,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:50,006 INFO L225 Difference]: With dead ends: 31 [2021-01-06 11:33:50,006 INFO L226 Difference]: Without dead ends: 22 [2021-01-06 11:33:50,007 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2021-01-06 11:33:50,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-01-06 11:33:50,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-01-06 11:33:50,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-01-06 11:33:50,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-01-06 11:33:50,012 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2021-01-06 11:33:50,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:50,012 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-01-06 11:33:50,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 11:33:50,013 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-01-06 11:33:50,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-01-06 11:33:50,013 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:50,013 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:50,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:50,227 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:50,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:50,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1549880355, now seen corresponding path program 4 times [2021-01-06 11:33:50,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:50,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1659654351] [2021-01-06 11:33:50,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:50,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:50,386 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 11:33:50,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1659654351] [2021-01-06 11:33:50,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618387614] [2021-01-06 11:33:50,388 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:50,471 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:33:50,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:33:50,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 11:33:50,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:50,532 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 11:33:50,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:50,532 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 11:33:50,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226791472] [2021-01-06 11:33:50,533 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 11:33:50,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:50,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 11:33:50,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 11:33:50,535 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2021-01-06 11:33:50,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:50,593 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-01-06 11:33:50,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 11:33:50,594 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 20 [2021-01-06 11:33:50,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:50,595 INFO L225 Difference]: With dead ends: 32 [2021-01-06 11:33:50,595 INFO L226 Difference]: Without dead ends: 24 [2021-01-06 11:33:50,596 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 11:33:50,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-01-06 11:33:50,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-01-06 11:33:50,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 11:33:50,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-01-06 11:33:50,601 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2021-01-06 11:33:50,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:50,601 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-01-06 11:33:50,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 11:33:50,601 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-01-06 11:33:50,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-01-06 11:33:50,602 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:50,602 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:50,815 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-01-06 11:33:50,816 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:50,817 INFO L82 PathProgramCache]: Analyzing trace with hash 258175967, now seen corresponding path program 5 times [2021-01-06 11:33:50,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:50,818 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426867053] [2021-01-06 11:33:50,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:50,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:50,951 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 11:33:50,952 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426867053] [2021-01-06 11:33:50,952 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053117798] [2021-01-06 11:33:50,952 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:51,041 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-01-06 11:33:51,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:33:51,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 11:33:51,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:51,108 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 11:33:51,108 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:33:51,109 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-01-06 11:33:51,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245597398] [2021-01-06 11:33:51,109 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 11:33:51,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:33:51,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 11:33:51,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 11:33:51,111 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 10 states. [2021-01-06 11:33:51,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:33:51,164 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-01-06 11:33:51,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 11:33:51,165 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 22 [2021-01-06 11:33:51,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:33:51,165 INFO L225 Difference]: With dead ends: 34 [2021-01-06 11:33:51,165 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 11:33:51,166 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 11:33:51,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 11:33:51,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-01-06 11:33:51,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2021-01-06 11:33:51,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-01-06 11:33:51,171 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2021-01-06 11:33:51,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:33:51,171 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-01-06 11:33:51,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 11:33:51,171 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-01-06 11:33:51,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 11:33:51,172 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:33:51,172 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:33:51,386 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:51,387 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:33:51,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:33:51,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1661453471, now seen corresponding path program 6 times [2021-01-06 11:33:51,389 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:33:51,389 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85250254] [2021-01-06 11:33:51,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:33:51,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:33:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 11:33:51,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85250254] [2021-01-06 11:33:51,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1440146682] [2021-01-06 11:33:51,497 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:33:51,619 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-01-06 11:33:51,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:33:51,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 21 conjunts are in the unsatisfiable core [2021-01-06 11:33:51,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:33:51,667 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 11:33:51,674 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 11:33:51,680 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2021-01-06 11:33:51,694 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2021-01-06 11:33:52,176 WARN L197 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 30 [2021-01-06 11:33:52,357 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2021-01-06 11:33:54,470 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 14 disjuncts [2021-01-06 11:34:00,576 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 15 disjuncts [2021-01-06 11:35:27,670 INFO L757 QuantifierPusher]: Run 10 iterations of DualJunctionQuantifierElimination maybe there is a nontermination bug. [2021-01-06 11:37:37,993 INFO L757 QuantifierPusher]: Run 20 iterations of DualJunctionQuantifierElimination maybe there is a nontermination bug.