/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-fpi/brs2f.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:45:39,940 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:45:39,942 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:45:39,962 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:45:39,963 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:45:39,964 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:45:39,966 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:45:39,977 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:45:39,981 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:45:39,985 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:45:39,987 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:45:39,989 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:45:39,989 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:45:39,991 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:45:39,994 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:45:39,995 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:45:39,996 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:45:39,997 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:45:39,999 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:45:40,004 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:45:40,009 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:45:40,013 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:45:40,014 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:45:40,015 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:45:40,017 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 11:45:40,017 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 11:45:40,018 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 11:45:40,020 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 11:45:40,021 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 11:45:40,023 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 11:45:40,023 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 11:45:40,024 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 11:45:40,025 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 11:45:40,026 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 11:45:40,027 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 11:45:40,028 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 11:45:40,028 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 11:45:40,028 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 11:45:40,029 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:45:40,029 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:45:40,031 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:45:40,032 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:45:40,073 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:45:40,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:45:40,075 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:45:40,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:45:40,075 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:45:40,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:45:40,075 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:45:40,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:45:40,076 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:45:40,076 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:45:40,077 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:45:40,077 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:45:40,078 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:45:40,078 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:45:40,078 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:45:40,078 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:45:40,078 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:45:40,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:45:40,079 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:45:40,079 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:45:40,079 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:45:40,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:45:40,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:45:40,081 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:45:40,081 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:45:40,081 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:45:40,081 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:40,082 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:45:40,082 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:45:40,082 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:45:40,371 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:45:40,390 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:45:40,394 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:45:40,395 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:45:40,396 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:45:40,397 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/brs2f.c [2020-07-20 11:45:40,486 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858805fa2/5aa0cdb8da3445c3addc7fbe0c5cd7a2/FLAGaefe554f3 [2020-07-20 11:45:40,923 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:45:40,923 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/brs2f.c [2020-07-20 11:45:40,931 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858805fa2/5aa0cdb8da3445c3addc7fbe0c5cd7a2/FLAGaefe554f3 [2020-07-20 11:45:41,257 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/858805fa2/5aa0cdb8da3445c3addc7fbe0c5cd7a2 [2020-07-20 11:45:41,268 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:45:41,271 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:45:41,272 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:41,273 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:45:41,277 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:45:41,278 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,281 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c73a45d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41, skipping insertion in model container [2020-07-20 11:45:41,282 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,290 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:45:41,308 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:45:41,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:41,469 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:45:41,490 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:45:41,505 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:45:41,505 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41 WrapperNode [2020-07-20 11:45:41,506 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:45:41,506 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:45:41,506 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:45:41,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:45:41,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,609 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,609 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,618 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,623 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,625 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... [2020-07-20 11:45:41,627 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:45:41,627 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:45:41,628 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:45:41,628 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:45:41,629 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 11:45:41,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:45:41,689 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:45:41,690 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:45:41,691 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:45:41,691 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:45:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:45:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:45:41,692 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:45:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:45:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:45:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:45:41,693 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:45:41,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:45:41,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:45:41,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:45:41,697 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:45:41,697 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:45:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:45:41,698 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:45:42,007 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:45:42,007 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 11:45:42,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:42 BoogieIcfgContainer [2020-07-20 11:45:42,011 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:45:42,013 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:45:42,013 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:45:42,016 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:45:42,016 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:45:41" (1/3) ... [2020-07-20 11:45:42,017 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d0b55e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:42, skipping insertion in model container [2020-07-20 11:45:42,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:45:41" (2/3) ... [2020-07-20 11:45:42,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d0b55e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:45:42, skipping insertion in model container [2020-07-20 11:45:42,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:45:42" (3/3) ... [2020-07-20 11:45:42,020 INFO L109 eAbstractionObserver]: Analyzing ICFG brs2f.c [2020-07-20 11:45:42,032 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:45:42,040 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:45:42,059 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:45:42,086 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:45:42,086 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:45:42,086 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:45:42,086 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:45:42,087 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:45:42,087 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:45:42,087 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:45:42,087 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:45:42,104 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:45:42,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:45:42,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:42,110 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:42,110 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:42,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:42,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1824292310, now seen corresponding path program 1 times [2020-07-20 11:45:42,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:42,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [779280829] [2020-07-20 11:45:42,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:42,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:42,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:45:42,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:42,250 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:42,251 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:42,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [779280829] [2020-07-20 11:45:42,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:42,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:45:42,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194440642] [2020-07-20 11:45:42,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:45:42,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:42,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:45:42,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:42,277 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-20 11:45:42,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:42,302 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-07-20 11:45:42,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:45:42,303 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 21 [2020-07-20 11:45:42,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:42,311 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:45:42,312 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 11:45:42,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:45:42,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 11:45:42,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-20 11:45:42,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 11:45:42,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2020-07-20 11:45:42,358 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 21 [2020-07-20 11:45:42,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:42,359 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2020-07-20 11:45:42,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:45:42,359 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2020-07-20 11:45:42,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 11:45:42,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:42,361 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:42,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:42,576 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:42,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:42,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1767537087, now seen corresponding path program 1 times [2020-07-20 11:45:42,577 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:42,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812733949] [2020-07-20 11:45:42,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:42,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:42,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:45:42,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:42,708 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:42,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:42,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812733949] [2020-07-20 11:45:42,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:42,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:45:42,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452600204] [2020-07-20 11:45:42,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:45:42,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:42,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:45:42,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:45:42,713 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 4 states. [2020-07-20 11:45:42,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:42,794 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 11:45:42,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:45:42,795 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2020-07-20 11:45:42,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:42,796 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:45:42,797 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 11:45:42,798 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:45:42,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 11:45:42,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 28. [2020-07-20 11:45:42,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:45:42,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-20 11:45:42,806 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 21 [2020-07-20 11:45:42,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:42,807 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-20 11:45:42,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:45:42,807 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-20 11:45:42,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:45:42,808 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:42,809 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:43,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:43,023 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:43,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:43,024 INFO L82 PathProgramCache]: Analyzing trace with hash -395878216, now seen corresponding path program 1 times [2020-07-20 11:45:43,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:43,025 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667382389] [2020-07-20 11:45:43,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:43,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:43,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:45:43,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:43,181 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-07-20 11:45:43,182 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:43,191 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:43,192 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:45:43,193 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-07-20 11:45:43,230 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-07-20 11:45:43,231 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:43,237 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:43,237 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:45:43,238 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:18, output treesize:7 [2020-07-20 11:45:43,258 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:45:43,264 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:45:43,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:43,294 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:43,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667382389] [2020-07-20 11:45:43,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:43,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 11:45:43,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067248411] [2020-07-20 11:45:43,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 11:45:43,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:43,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 11:45:43,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 11:45:43,297 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2020-07-20 11:45:43,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:43,424 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2020-07-20 11:45:43,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 11:45:43,425 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2020-07-20 11:45:43,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:43,427 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:45:43,427 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:45:43,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:45:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:45:43,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-07-20 11:45:43,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 11:45:43,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-20 11:45:43,434 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 27 [2020-07-20 11:45:43,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:43,435 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-20 11:45:43,435 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 11:45:43,435 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-20 11:45:43,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 11:45:43,436 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:43,436 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:43,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:43,652 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:43,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:43,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1205224842, now seen corresponding path program 1 times [2020-07-20 11:45:43,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:43,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227086547] [2020-07-20 11:45:43,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:43,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:43,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:45:43,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:43,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:45:43,737 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:45:43,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227086547] [2020-07-20 11:45:43,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:45:43,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:45:43,738 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716015992] [2020-07-20 11:45:43,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:45:43,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:43,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:45:43,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:43,740 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 3 states. [2020-07-20 11:45:43,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:43,790 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-20 11:45:43,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:45:43,793 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-20 11:45:43,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:43,794 INFO L225 Difference]: With dead ends: 48 [2020-07-20 11:45:43,796 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:45:43,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:45:43,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:45:43,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-20 11:45:43,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 11:45:43,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 11:45:43,812 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-20 11:45:43,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:43,813 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 11:45:43,813 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:45:43,813 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 11:45:43,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-20 11:45:43,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:43,815 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:44,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:44,029 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:44,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:44,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1239476407, now seen corresponding path program 1 times [2020-07-20 11:45:44,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:44,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307038874] [2020-07-20 11:45:44,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:44,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:44,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:45:44,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:44,129 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:44,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:44,176 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:44,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307038874] [2020-07-20 11:45:44,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:44,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 11:45:44,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429518833] [2020-07-20 11:45:44,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 11:45:44,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:44,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 11:45:44,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-20 11:45:44,179 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 9 states. [2020-07-20 11:45:44,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:44,304 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2020-07-20 11:45:44,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 11:45:44,305 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-07-20 11:45:44,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:44,306 INFO L225 Difference]: With dead ends: 54 [2020-07-20 11:45:44,306 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:45:44,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 49 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:45:44,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:45:44,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 35. [2020-07-20 11:45:44,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 11:45:44,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-20 11:45:44,313 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 30 [2020-07-20 11:45:44,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:44,314 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-20 11:45:44,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 11:45:44,314 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-20 11:45:44,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-20 11:45:44,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:44,315 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:44,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:44,523 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:44,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:44,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1492634651, now seen corresponding path program 1 times [2020-07-20 11:45:44,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:44,524 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233291835] [2020-07-20 11:45:44,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:44,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:44,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:45:44,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:44,610 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-07-20 11:45:44,611 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,617 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:44,618 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,618 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:18 [2020-07-20 11:45:44,662 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:45:44,665 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2020-07-20 11:45:44,666 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,675 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:44,676 INFO L544 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,676 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:32, output treesize:28 [2020-07-20 11:45:44,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:45:44,732 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 25 [2020-07-20 11:45:44,734 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,744 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:44,746 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2020-07-20 11:45:44,747 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:48, output treesize:31 [2020-07-20 11:45:44,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-07-20 11:45:44,795 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 10 [2020-07-20 11:45:44,796 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,802 INFO L624 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-07-20 11:45:44,803 INFO L544 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-07-20 11:45:44,803 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:38, output treesize:7 [2020-07-20 11:45:44,822 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:45:44,824 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:45:44,869 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:44,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:44,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:45:46,050 WARN L838 $PredicateComparison]: unable to prove that (forall ((|main_~#sum~0.offset| Int)) (< (select (select (store |c_#memory_int| |c_main_~#sum~0.base| (store (select |c_#memory_int| |c_main_~#sum~0.base|) |main_~#sum~0.offset| 0)) c_main_~a~0.base) (+ (* c_main_~i~0 4) c_main_~a~0.offset 4)) (+ (* 2 c_~N~0) 1))) is different from false [2020-07-20 11:45:46,897 WARN L838 $PredicateComparison]: unable to prove that (forall ((|main_~#sum~0.offset| Int)) (< (select (select (store |c_#memory_int| |c_main_~#sum~0.base| (store (select |c_#memory_int| |c_main_~#sum~0.base|) |main_~#sum~0.offset| 0)) c_main_~a~0.base) (+ c_main_~a~0.offset 4)) (+ (* 2 c_~N~0) 1))) is different from false [2020-07-20 11:45:46,916 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 100 treesize of output 94 [2020-07-20 11:45:46,921 INFO L544 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-07-20 11:45:46,958 INFO L624 ElimStorePlain]: treesize reduction 40, result has 45.9 percent of original size [2020-07-20 11:45:46,961 INFO L544 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2020-07-20 11:45:46,961 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:45, output treesize:17 [2020-07-20 11:45:47,034 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 6 not checked. [2020-07-20 11:45:47,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233291835] [2020-07-20 11:45:47,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:47,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 11:45:47,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659821519] [2020-07-20 11:45:47,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:45:47,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:47,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:45:47,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=306, Unknown=2, NotChecked=74, Total=462 [2020-07-20 11:45:47,037 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 22 states. [2020-07-20 11:45:47,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:47,562 INFO L93 Difference]: Finished difference Result 64 states and 75 transitions. [2020-07-20 11:45:47,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 11:45:47,568 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 33 [2020-07-20 11:45:47,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:47,570 INFO L225 Difference]: With dead ends: 64 [2020-07-20 11:45:47,570 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 11:45:47,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 43 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=119, Invalid=487, Unknown=2, NotChecked=94, Total=702 [2020-07-20 11:45:47,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 11:45:47,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-20 11:45:47,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 11:45:47,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2020-07-20 11:45:47,586 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 33 [2020-07-20 11:45:47,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:47,587 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2020-07-20 11:45:47,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:45:47,588 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2020-07-20 11:45:47,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 11:45:47,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:47,591 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:47,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:47,805 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:47,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:47,805 INFO L82 PathProgramCache]: Analyzing trace with hash -2145280396, now seen corresponding path program 2 times [2020-07-20 11:45:47,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:47,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423553094] [2020-07-20 11:45:47,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:47,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:45:47,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 11:45:47,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:45:47,917 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:47,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:45:47,978 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 12 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:45:47,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423553094] [2020-07-20 11:45:47,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:45:47,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 11:45:47,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472594038] [2020-07-20 11:45:47,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:45:47,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:45:47,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:45:47,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:45:47,981 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 12 states. [2020-07-20 11:45:48,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:45:48,165 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2020-07-20 11:45:48,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:45:48,166 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 36 [2020-07-20 11:45:48,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:45:48,167 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:45:48,167 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 11:45:48,167 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=166, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:45:48,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 11:45:48,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2020-07-20 11:45:48,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 11:45:48,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-07-20 11:45:48,174 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 36 [2020-07-20 11:45:48,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:45:48,175 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-07-20 11:45:48,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:45:48,175 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-07-20 11:45:48,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 11:45:48,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:45:48,176 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:45:48,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:48,378 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:45:48,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:45:48,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1680039082, now seen corresponding path program 3 times [2020-07-20 11:45:48,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:45:48,379 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [372196626] [2020-07-20 11:45:48,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:48,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:45:48,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:45:48,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:45:48,447 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:45:48,475 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:45:48,475 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:45:48,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:45:48,728 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:45:48 BoogieIcfgContainer [2020-07-20 11:45:48,728 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:45:48,730 INFO L168 Benchmark]: Toolchain (without parser) took 7460.60 ms. Allocated memory was 139.5 MB in the beginning and 244.3 MB in the end (delta: 104.9 MB). Free memory was 103.2 MB in the beginning and 185.3 MB in the end (delta: -82.1 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,731 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 139.5 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,732 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.62 ms. Allocated memory is still 139.5 MB. Free memory was 103.0 MB in the beginning and 92.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,732 INFO L168 Benchmark]: Boogie Preprocessor took 120.71 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.5 MB in the beginning and 181.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,733 INFO L168 Benchmark]: RCFGBuilder took 384.02 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 164.1 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,734 INFO L168 Benchmark]: TraceAbstraction took 6715.78 ms. Allocated memory was 203.4 MB in the beginning and 244.3 MB in the end (delta: 40.9 MB). Free memory was 164.1 MB in the beginning and 185.3 MB in the end (delta: -21.2 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. [2020-07-20 11:45:48,737 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 139.5 MB. Free memory was 122.6 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 233.62 ms. Allocated memory is still 139.5 MB. Free memory was 103.0 MB in the beginning and 92.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 120.71 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.5 MB in the beginning and 181.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 384.02 ms. Allocated memory is still 203.4 MB. Free memory was 181.5 MB in the beginning and 164.1 MB in the end (delta: 17.4 MB). Peak memory consumption was 17.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6715.78 ms. Allocated memory was 203.4 MB in the beginning and 244.3 MB in the end (delta: 40.9 MB). Free memory was 164.1 MB in the beginning and 185.3 MB in the end (delta: -21.2 MB). Peak memory consumption was 19.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] int N; VAL [\old(N)=5, N=0] [L21] N = __VERIFIER_nondet_int() [L22] COND FALSE !(N <= 0) VAL [\old(N)=0, N=3] [L23] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(cond)=1, \old(N)=0, N=3] [L11] COND FALSE !(!cond) VAL [\old(cond)=1, \old(N)=0, cond=1, N=3] [L23] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(N)=0, N=3] [L25] int i; [L26] long long sum[1]; [L27] int *a = malloc(sizeof(int)*N); [L29] i=0 VAL [\old(N)=0, a={-1:0}, i=0, malloc(sizeof(int)*N)={-1:0}, N=3, sum={2:0}] [L29] COND TRUE i