/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/nsqm-iff.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:47:01,149 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:47:01,151 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:47:01,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:47:01,165 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:47:01,167 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:47:01,168 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:47:01,170 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:47:01,172 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:47:01,173 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:47:01,174 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:47:01,176 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:47:01,176 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:47:01,177 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:47:01,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:47:01,179 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:47:01,180 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:47:01,181 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:47:01,183 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:47:01,185 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:47:01,187 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:47:01,188 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:47:01,189 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:47:01,190 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:47:01,193 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:47:01,201 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:47:01,202 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:47:01,203 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:47:01,204 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 11:47:01,219 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:47:01,219 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:47:01,220 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:47:01,220 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:47:01,221 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:47:01,221 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:47:01,221 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:47:01,221 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:47:01,221 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:47:01,222 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:47:01,223 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:47:01,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:47:01,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:47:01,223 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:47:01,223 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:47:01,224 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:47:01,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:47:01,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:47:01,224 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:47:01,225 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:47:01,225 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:47:01,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:01,225 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:47:01,225 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:47:01,226 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 11:47:01,537 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:47:01,550 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:47:01,554 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:47:01,556 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:47:01,556 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:47:01,557 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-fpi/nsqm-iff.c [2020-07-20 11:47:01,647 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b463cac6f/b0158b62e3be4bfbabd7123770d6e6ea/FLAG0455a55b1 [2020-07-20 11:47:02,187 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:47:02,188 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-fpi/nsqm-iff.c [2020-07-20 11:47:02,195 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b463cac6f/b0158b62e3be4bfbabd7123770d6e6ea/FLAG0455a55b1 [2020-07-20 11:47:02,615 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b463cac6f/b0158b62e3be4bfbabd7123770d6e6ea [2020-07-20 11:47:02,630 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:47:02,635 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:47:02,640 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:47:02,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:47:02,645 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:47:02,647 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:02,650 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d6b0a94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02, skipping insertion in model container [2020-07-20 11:47:02,651 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:02,662 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:47:02,691 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:47:02,901 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:47:02,912 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:47:02,936 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:47:02,954 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:47:02,955 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02 WrapperNode [2020-07-20 11:47:02,955 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:47:02,956 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:47:02,956 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:47:02,956 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:47:03,058 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,067 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,068 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,076 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,083 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (1/1) ... [2020-07-20 11:47:03,087 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:47:03,088 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:47:03,088 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:47:03,088 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:47:03,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (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 11:47:03,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:47:03,166 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:47:03,166 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:47:03,166 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:47:03,166 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:47:03,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:47:03,167 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-20 11:47:03,168 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:47:03,168 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:47:03,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:47:03,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:47:03,168 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:47:03,543 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:47:03,543 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 11:47:03,550 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:47:03 BoogieIcfgContainer [2020-07-20 11:47:03,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:47:03,558 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:47:03,559 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:47:03,561 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:47:03,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:47:02" (1/3) ... [2020-07-20 11:47:03,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69db2894 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:47:03, skipping insertion in model container [2020-07-20 11:47:03,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:47:02" (2/3) ... [2020-07-20 11:47:03,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69db2894 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:47:03, skipping insertion in model container [2020-07-20 11:47:03,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:47:03" (3/3) ... [2020-07-20 11:47:03,571 INFO L109 eAbstractionObserver]: Analyzing ICFG nsqm-iff.c [2020-07-20 11:47:03,586 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:47:03,595 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:47:03,608 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:47:03,634 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:47:03,634 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:47:03,635 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:47:03,635 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:47:03,635 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:47:03,636 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:47:03,636 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:47:03,636 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:47:03,655 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2020-07-20 11:47:03,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:47:03,664 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:03,665 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] [2020-07-20 11:47:03,666 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:03,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:03,671 INFO L82 PathProgramCache]: Analyzing trace with hash -294712258, now seen corresponding path program 1 times [2020-07-20 11:47:03,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:03,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [547865203] [2020-07-20 11:47:03,681 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 11:47:03,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:03,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:47:03,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:03,830 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 11:47:03,830 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:47:03,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [547865203] [2020-07-20 11:47:03,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:47:03,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:47:03,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219900457] [2020-07-20 11:47:03,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:47:03,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:03,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:47:03,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:47:03,854 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 2 states. [2020-07-20 11:47:03,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:03,880 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2020-07-20 11:47:03,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:47:03,882 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-20 11:47:03,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:03,890 INFO L225 Difference]: With dead ends: 62 [2020-07-20 11:47:03,891 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 11:47:03,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 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 11:47:03,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 11:47:03,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-20 11:47:03,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 11:47:03,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-20 11:47:03,942 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-07-20 11:47:03,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:03,943 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-20 11:47:03,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:47:03,943 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-20 11:47:03,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:47:03,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:03,945 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] [2020-07-20 11:47:04,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:04,159 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:04,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:04,161 INFO L82 PathProgramCache]: Analyzing trace with hash -2054124171, now seen corresponding path program 1 times [2020-07-20 11:47:04,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:04,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536227398] [2020-07-20 11:47:04,162 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 11:47:04,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:47:04,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:47:04,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:47:04,289 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 11:47:04,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:47:04,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536227398] [2020-07-20 11:47:04,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:47:04,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 11:47:04,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141866419] [2020-07-20 11:47:04,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 11:47:04,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:47:04,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 11:47:04,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 11:47:04,295 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 4 states. [2020-07-20 11:47:04,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:47:04,400 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2020-07-20 11:47:04,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 11:47:04,401 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-07-20 11:47:04,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:47:04,404 INFO L225 Difference]: With dead ends: 56 [2020-07-20 11:47:04,404 INFO L226 Difference]: Without dead ends: 41 [2020-07-20 11:47:04,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 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 11:47:04,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-20 11:47:04,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-20 11:47:04,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:47:04,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-20 11:47:04,420 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 22 [2020-07-20 11:47:04,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:47:04,420 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-20 11:47:04,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 11:47:04,420 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-20 11:47:04,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 11:47:04,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:47:04,422 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, 1] [2020-07-20 11:47:04,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:04,629 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:47:04,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:47:04,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1477618916, now seen corresponding path program 1 times [2020-07-20 11:47:04,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:47:04,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539106096] [2020-07-20 11:47:04,632 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 11:47:04,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:47:04,692 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:47:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:47:04,713 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:47:04,749 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:47:04,752 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:47:04,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:47:05,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:47:05 BoogieIcfgContainer [2020-07-20 11:47:05,015 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:47:05,019 INFO L168 Benchmark]: Toolchain (without parser) took 2385.71 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 102.1 MB in the beginning and 99.5 MB in the end (delta: 2.6 MB). Peak memory consumption was 66.1 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,020 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,021 INFO L168 Benchmark]: CACSL2BoogieTranslator took 315.65 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 91.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,023 INFO L168 Benchmark]: Boogie Preprocessor took 131.80 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.4 MB in the beginning and 178.1 MB in the end (delta: -86.8 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,024 INFO L168 Benchmark]: RCFGBuilder took 462.97 ms. Allocated memory is still 200.8 MB. Free memory was 178.1 MB in the beginning and 160.6 MB in the end (delta: 17.5 MB). Peak memory consumption was 17.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,025 INFO L168 Benchmark]: TraceAbstraction took 1457.14 ms. Allocated memory is still 200.8 MB. Free memory was 160.6 MB in the beginning and 99.5 MB in the end (delta: 61.1 MB). Peak memory consumption was 61.1 MB. Max. memory is 7.1 GB. [2020-07-20 11:47:05,033 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 315.65 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 91.4 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.80 ms. Allocated memory was 137.4 MB in the beginning and 200.8 MB in the end (delta: 63.4 MB). Free memory was 91.4 MB in the beginning and 178.1 MB in the end (delta: -86.8 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 462.97 ms. Allocated memory is still 200.8 MB. Free memory was 178.1 MB in the beginning and 160.6 MB in the end (delta: 17.5 MB). Peak memory consumption was 17.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1457.14 ms. Allocated memory is still 200.8 MB. Free memory was 160.6 MB in the beginning and 99.5 MB in the end (delta: 61.1 MB). Peak memory consumption was 61.1 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=1] [L23] CALL assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(cond)=1, \old(N)=0, N=1] [L11] COND FALSE !(!cond) VAL [\old(cond)=1, \old(N)=0, cond=1, N=1] [L23] RET assume_abort_if_not(N <= 2147483647/sizeof(int)) VAL [\old(N)=0, N=1] [L25] int i; [L26] long long *a = malloc(sizeof(long long)*N); [L27] long long *b = malloc(sizeof(long long)*N); [L29] i=0 VAL [\old(N)=0, a={-1:0}, b={-2:0}, i=0, malloc(sizeof(long long)*N)={-2:0}, malloc(sizeof(long long)*N)={-1:0}, N=1] [L29] COND TRUE i