/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/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:40:31,814 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:40:31,816 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:40:31,828 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:40:31,829 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:40:31,830 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:40:31,831 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:40:31,833 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:40:31,834 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:40:31,835 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:40:31,836 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:40:31,837 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:40:31,838 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:40:31,838 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:40:31,839 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:40:31,841 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:40:31,841 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:40:31,842 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:40:31,844 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:40:31,846 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:40:31,848 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:40:31,849 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:40:31,850 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:40:31,851 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:40:31,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:40:31,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:40:31,863 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:40:31,864 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:40:31,864 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 [2020-07-21 11:40:31,882 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:40:31,883 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:40:31,884 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:40:31,884 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:40:31,884 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:40:31,884 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:40:31,885 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:40:31,885 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:40:31,886 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:40:31,886 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:40:31,886 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:40:31,886 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:40:31,886 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:40:31,887 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:40:31,887 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:40:31,887 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:40:31,888 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:40:31,889 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:40:31,889 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:40:31,889 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:40:31,889 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:40:31,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:40:31,890 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:40:31,890 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:40:31,890 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:40:31,890 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:40:31,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:31,891 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:40:31,891 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:40:31,891 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 [2020-07-21 11:40:32,179 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:40:32,192 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:40:32,195 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:40:32,197 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:40:32,197 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:40:32,198 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 11:40:32,265 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/812231d31/5df1f72e6ef542cb96ca639137188b23/FLAGc71890001 [2020-07-21 11:40:32,673 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:40:32,673 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-21 11:40:32,680 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/812231d31/5df1f72e6ef542cb96ca639137188b23/FLAGc71890001 [2020-07-21 11:40:33,036 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/812231d31/5df1f72e6ef542cb96ca639137188b23 [2020-07-21 11:40:33,044 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:40:33,047 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:40:33,049 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:40:33,049 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:40:33,053 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:40:33,054 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@730ed28d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33, skipping insertion in model container [2020-07-21 11:40:33,057 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,065 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:40:33,081 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:40:33,238 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:40:33,243 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:40:33,263 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:40:33,284 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:40:33,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33 WrapperNode [2020-07-21 11:40:33,285 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:40:33,286 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:40:33,286 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:40:33,286 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:40:33,301 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,413 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,428 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (1/1) ... [2020-07-21 11:40:33,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:40:33,438 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:40:33,442 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:40:33,442 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:40:33,447 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (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 [2020-07-21 11:40:33,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:40:33,519 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:40:33,519 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:40:33,519 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:40:33,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:40:33,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:40:33,519 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:40:33,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:40:33,708 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:40:33,709 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 11:40:33,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:40:33 BoogieIcfgContainer [2020-07-21 11:40:33,713 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:40:33,714 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:40:33,714 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:40:33,718 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:40:33,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:40:33" (1/3) ... [2020-07-21 11:40:33,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ecfe797 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:40:33, skipping insertion in model container [2020-07-21 11:40:33,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:40:33" (2/3) ... [2020-07-21 11:40:33,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ecfe797 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:40:33, skipping insertion in model container [2020-07-21 11:40:33,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:40:33" (3/3) ... [2020-07-21 11:40:33,721 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-07-21 11:40:33,732 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:40:33,739 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:40:33,753 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:40:33,775 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:40:33,776 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:40:33,776 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:40:33,776 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:40:33,776 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:40:33,776 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:40:33,777 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:40:33,777 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:40:33,796 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-21 11:40:33,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 11:40:33,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:33,803 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:33,803 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:33,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:33,810 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-07-21 11:40:33,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:33,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68750696] [2020-07-21 11:40:33,819 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 [2020-07-21 11:40:33,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:33,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:40:33,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:33,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:34,000 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:40:34,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68750696] [2020-07-21 11:40:34,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:40:34,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:40:34,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972367984] [2020-07-21 11:40:34,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:40:34,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:34,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:40:34,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:40:34,033 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-21 11:40:34,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:34,060 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-07-21 11:40:34,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:40:34,061 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-21 11:40:34,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:34,071 INFO L225 Difference]: With dead ends: 34 [2020-07-21 11:40:34,072 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 11:40:34,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:40:34,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 11:40:34,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 11:40:34,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 11:40:34,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 11:40:34,128 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 11:40:34,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:34,128 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 11:40:34,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:40:34,129 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 11:40:34,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 11:40:34,130 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:34,130 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:34,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:34,345 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:34,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:34,347 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-07-21 11:40:34,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:34,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445508270] [2020-07-21 11:40:34,348 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 [2020-07-21 11:40:34,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:34,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 11:40:34,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:34,439 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:34,439 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:40:34,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445508270] [2020-07-21 11:40:34,440 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:40:34,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:40:34,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669252379] [2020-07-21 11:40:34,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:40:34,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:34,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:40:34,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:40:34,444 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 3 states. [2020-07-21 11:40:34,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:34,463 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-21 11:40:34,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:40:34,464 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-21 11:40:34,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:34,465 INFO L225 Difference]: With dead ends: 22 [2020-07-21 11:40:34,465 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 11:40:34,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:40:34,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 11:40:34,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-21 11:40:34,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 11:40:34,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 11:40:34,472 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 11:40:34,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:34,473 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 11:40:34,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:40:34,473 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 11:40:34,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 11:40:34,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:34,475 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:34,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:34,691 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:34,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:34,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-07-21 11:40:34,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:34,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011797750] [2020-07-21 11:40:34,694 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 [2020-07-21 11:40:34,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:34,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 11:40:34,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:34,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:34,773 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:40:34,813 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:34,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011797750] [2020-07-21 11:40:34,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:34,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 11:40:34,815 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878976925] [2020-07-21 11:40:34,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 11:40:34,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:34,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 11:40:34,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:40:34,816 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-07-21 11:40:34,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:34,851 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-21 11:40:34,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 11:40:34,852 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-21 11:40:34,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:34,853 INFO L225 Difference]: With dead ends: 27 [2020-07-21 11:40:34,853 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 11:40:34,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 11:40:34,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 11:40:34,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 11:40:34,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 11:40:34,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 11:40:34,860 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 11:40:34,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:34,860 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 11:40:34,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 11:40:34,861 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 11:40:34,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:40:34,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:34,862 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:35,067 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:35,071 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:35,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:35,072 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 2 times [2020-07-21 11:40:35,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:35,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531010481] [2020-07-21 11:40:35,072 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 [2020-07-21 11:40:35,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:35,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 11:40:35,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:35,185 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:35,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:40:35,275 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:35,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531010481] [2020-07-21 11:40:35,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:35,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 11:40:35,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653760265] [2020-07-21 11:40:35,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 11:40:35,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:35,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 11:40:35,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:40:35,279 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-07-21 11:40:35,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:35,341 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-21 11:40:35,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 11:40:35,342 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-07-21 11:40:35,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:35,343 INFO L225 Difference]: With dead ends: 39 [2020-07-21 11:40:35,343 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 11:40:35,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 11:40:35,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 11:40:35,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 11:40:35,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 11:40:35,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 11:40:35,351 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 11:40:35,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:35,352 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 11:40:35,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 11:40:35,352 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 11:40:35,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 11:40:35,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:35,353 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:35,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:35,567 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:35,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:35,569 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 3 times [2020-07-21 11:40:35,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:35,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866805730] [2020-07-21 11:40:35,570 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 [2020-07-21 11:40:35,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:35,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 11:40:35,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:35,821 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:35,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:40:36,085 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:36,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866805730] [2020-07-21 11:40:36,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:36,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 11:40:36,087 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25110018] [2020-07-21 11:40:36,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 11:40:36,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:36,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 11:40:36,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:40:36,089 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 24 states. [2020-07-21 11:40:36,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:36,193 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2020-07-21 11:40:36,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 11:40:36,194 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2020-07-21 11:40:36,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:36,195 INFO L225 Difference]: With dead ends: 63 [2020-07-21 11:40:36,196 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 11:40:36,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 11:40:36,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 11:40:36,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 11:40:36,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 11:40:36,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 11:40:36,207 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 11:40:36,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:36,208 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 11:40:36,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 11:40:36,208 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 11:40:36,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 11:40:36,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:36,210 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:36,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:36,426 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:36,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:36,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 4 times [2020-07-21 11:40:36,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:36,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [317432003] [2020-07-21 11:40:36,427 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 [2020-07-21 11:40:36,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:36,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 11:40:36,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:36,904 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:36,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:40:37,888 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:37,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [317432003] [2020-07-21 11:40:37,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:37,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 11:40:37,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [174462411] [2020-07-21 11:40:37,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 11:40:37,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:37,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 11:40:37,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:40:37,899 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 48 states. [2020-07-21 11:40:38,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:38,131 INFO L93 Difference]: Finished difference Result 111 states and 134 transitions. [2020-07-21 11:40:38,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 11:40:38,135 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 56 [2020-07-21 11:40:38,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:38,137 INFO L225 Difference]: With dead ends: 111 [2020-07-21 11:40:38,137 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 11:40:38,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 11:40:38,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 11:40:38,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-21 11:40:38,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-21 11:40:38,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-07-21 11:40:38,166 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2020-07-21 11:40:38,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:38,167 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-07-21 11:40:38,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 11:40:38,167 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-07-21 11:40:38,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-21 11:40:38,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:38,173 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:38,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:38,387 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:38,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:38,388 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 5 times [2020-07-21 11:40:38,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:38,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345695555] [2020-07-21 11:40:38,389 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 [2020-07-21 11:40:38,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:38,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 11:40:38,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:39,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:39,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:40:43,241 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:43,242 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345695555] [2020-07-21 11:40:43,242 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:40:43,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 11:40:43,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104248107] [2020-07-21 11:40:43,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 11:40:43,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:40:43,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 11:40:43,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 11:40:43,249 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 96 states. [2020-07-21 11:40:43,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:40:43,612 INFO L93 Difference]: Finished difference Result 207 states and 254 transitions. [2020-07-21 11:40:43,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 11:40:43,612 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 104 [2020-07-21 11:40:43,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:40:43,615 INFO L225 Difference]: With dead ends: 207 [2020-07-21 11:40:43,615 INFO L226 Difference]: Without dead ends: 201 [2020-07-21 11:40:43,618 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 11:40:43,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-21 11:40:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2020-07-21 11:40:43,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-21 11:40:43,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2020-07-21 11:40:43,637 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 104 [2020-07-21 11:40:43,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:40:43,638 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2020-07-21 11:40:43,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 11:40:43,638 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2020-07-21 11:40:43,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-21 11:40:43,640 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:40:43,641 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:40:43,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:40:43,854 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:40:43,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:40:43,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1695638553, now seen corresponding path program 6 times [2020-07-21 11:40:43,855 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:40:43,855 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1180936424] [2020-07-21 11:40:43,855 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 [2020-07-21 11:40:43,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:40:43,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 11:40:43,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:40:48,594 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:40:48,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:41:02,378 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:41:02,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1180936424] [2020-07-21 11:41:02,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:41:02,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-21 11:41:02,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760626986] [2020-07-21 11:41:02,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-21 11:41:02,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:02,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-21 11:41:02,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 11:41:02,391 INFO L87 Difference]: Start difference. First operand 201 states and 201 transitions. Second operand 192 states. [2020-07-21 11:41:03,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:41:03,499 INFO L93 Difference]: Finished difference Result 399 states and 494 transitions. [2020-07-21 11:41:03,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-21 11:41:03,500 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 200 [2020-07-21 11:41:03,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:41:03,504 INFO L225 Difference]: With dead ends: 399 [2020-07-21 11:41:03,504 INFO L226 Difference]: Without dead ends: 393 [2020-07-21 11:41:03,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 209 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.1s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-21 11:41:03,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2020-07-21 11:41:03,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 393. [2020-07-21 11:41:03,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2020-07-21 11:41:03,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 393 transitions. [2020-07-21 11:41:03,537 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 393 transitions. Word has length 200 [2020-07-21 11:41:03,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:41:03,538 INFO L479 AbstractCegarLoop]: Abstraction has 393 states and 393 transitions. [2020-07-21 11:41:03,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-21 11:41:03,538 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 393 transitions. [2020-07-21 11:41:03,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2020-07-21 11:41:03,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:41:03,543 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:41:03,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:03,759 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:41:03,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:41:03,760 INFO L82 PathProgramCache]: Analyzing trace with hash 576174297, now seen corresponding path program 7 times [2020-07-21 11:41:03,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:41:03,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521831543] [2020-07-21 11:41:03,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:41:03,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:41:03,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 810 conjuncts, 192 conjunts are in the unsatisfiable core [2020-07-21 11:41:03,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:41:22,694 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:41:22,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:42:23,269 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:42:23,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521831543] [2020-07-21 11:42:23,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:42:23,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384 [2020-07-21 11:42:23,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1014021140] [2020-07-21 11:42:23,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 384 states [2020-07-21 11:42:23,271 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:42:23,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants. [2020-07-21 11:42:23,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-21 11:42:23,296 INFO L87 Difference]: Start difference. First operand 393 states and 393 transitions. Second operand 384 states. [2020-07-21 11:42:29,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:29,798 INFO L93 Difference]: Finished difference Result 783 states and 974 transitions. [2020-07-21 11:42:29,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2020-07-21 11:42:29,799 INFO L78 Accepts]: Start accepts. Automaton has 384 states. Word has length 392 [2020-07-21 11:42:29,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:29,805 INFO L225 Difference]: With dead ends: 783 [2020-07-21 11:42:29,805 INFO L226 Difference]: Without dead ends: 777 [2020-07-21 11:42:29,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 783 GetRequests, 401 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 78.8s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-21 11:42:29,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 777 states. [2020-07-21 11:42:29,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 777 to 777. [2020-07-21 11:42:29,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 777 states. [2020-07-21 11:42:29,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 777 states to 777 states and 777 transitions. [2020-07-21 11:42:29,852 INFO L78 Accepts]: Start accepts. Automaton has 777 states and 777 transitions. Word has length 392 [2020-07-21 11:42:29,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:29,854 INFO L479 AbstractCegarLoop]: Abstraction has 777 states and 777 transitions. [2020-07-21 11:42:29,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 384 states. [2020-07-21 11:42:29,854 INFO L276 IsEmpty]: Start isEmpty. Operand 777 states and 777 transitions. [2020-07-21 11:42:29,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 777 [2020-07-21 11:42:29,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:29,876 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:42:30,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:30,091 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:30,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:30,093 INFO L82 PathProgramCache]: Analyzing trace with hash -2018614695, now seen corresponding path program 8 times [2020-07-21 11:42:30,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:30,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1884897913] [2020-07-21 11:42:30,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:30,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:30,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 1578 conjuncts, 384 conjunts are in the unsatisfiable core [2020-07-21 11:42:30,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:43:59,981 INFO L134 CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:43:59,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:50:50,889 INFO L134 CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:50:50,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1884897913] [2020-07-21 11:50:50,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:50:50,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [385, 385] total 768 [2020-07-21 11:50:50,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056797323] [2020-07-21 11:50:50,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 768 states [2020-07-21 11:50:50,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:50:50,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 768 interpolants. [2020-07-21 11:50:50,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056 [2020-07-21 11:50:50,966 INFO L87 Difference]: Start difference. First operand 777 states and 777 transitions. Second operand 768 states. [2020-07-21 11:51:36,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:51:36,591 INFO L93 Difference]: Finished difference Result 1551 states and 1934 transitions. [2020-07-21 11:51:36,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2020-07-21 11:51:36,593 INFO L78 Accepts]: Start accepts. Automaton has 768 states. Word has length 776 [2020-07-21 11:51:36,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:51:36,601 INFO L225 Difference]: With dead ends: 1551 [2020-07-21 11:51:36,602 INFO L226 Difference]: Without dead ends: 1545 [2020-07-21 11:51:36,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1551 GetRequests, 785 SyntacticMatches, 0 SemanticMatches, 766 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 499.1s TimeCoverageRelationStatistics Valid=294528, Invalid=294528, Unknown=0, NotChecked=0, Total=589056 [2020-07-21 11:51:36,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1545 states. [2020-07-21 11:51:36,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1545 to 1545. [2020-07-21 11:51:36,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1545 states. [2020-07-21 11:51:36,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1545 states to 1545 states and 1545 transitions. [2020-07-21 11:51:36,653 INFO L78 Accepts]: Start accepts. Automaton has 1545 states and 1545 transitions. Word has length 776 [2020-07-21 11:51:36,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:51:36,655 INFO L479 AbstractCegarLoop]: Abstraction has 1545 states and 1545 transitions. [2020-07-21 11:51:36,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 768 states. [2020-07-21 11:51:36,655 INFO L276 IsEmpty]: Start isEmpty. Operand 1545 states and 1545 transitions. [2020-07-21 11:51:36,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1545 [2020-07-21 11:51:36,703 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:51:36,703 INFO L422 BasicCegarLoop]: trace histogram [766, 766, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:51:36,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:36,909 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:51:36,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:51:36,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1032041817, now seen corresponding path program 9 times [2020-07-21 11:51:36,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:51:36,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177901431] [2020-07-21 11:51:36,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:51:37,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:51:37,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 3114 conjuncts, 768 conjunts are in the unsatisfiable core [2020-07-21 11:51:37,549 INFO L286 TraceCheckSpWp]: Computing forward predicates...