/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-19 23:20:00,709 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-19 23:20:00,712 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-19 23:20:00,735 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-19 23:20:00,735 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-19 23:20:00,738 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-19 23:20:00,740 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-19 23:20:00,754 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-19 23:20:00,756 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-19 23:20:00,757 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-19 23:20:00,758 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-19 23:20:00,759 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-19 23:20:00,760 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-19 23:20:00,761 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-19 23:20:00,762 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-19 23:20:00,763 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-19 23:20:00,764 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-19 23:20:00,765 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-19 23:20:00,769 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-19 23:20:00,772 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-19 23:20:00,773 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-19 23:20:00,774 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-19 23:20:00,775 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-19 23:20:00,776 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-19 23:20:00,779 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-19 23:20:00,790 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-19 23:20:00,791 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-19 23:20:00,792 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-19 23:20:00,793 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 [2020-07-19 23:20:00,809 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-19 23:20:00,809 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-19 23:20:00,811 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-19 23:20:00,811 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-19 23:20:00,811 INFO L138 SettingsManager]: * Use SBE=true [2020-07-19 23:20:00,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-19 23:20:00,812 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-19 23:20:00,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-19 23:20:00,812 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-19 23:20:00,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-19 23:20:00,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-19 23:20:00,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-19 23:20:00,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-19 23:20:00,813 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-19 23:20:00,814 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-19 23:20:00,814 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-19 23:20:00,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-19 23:20:00,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-19 23:20:00,815 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-19 23:20:00,815 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-19 23:20:00,815 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-19 23:20:00,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-19 23:20:00,815 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-19 23:20:00,816 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-19 23:20:00,816 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-19 23:20:00,816 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-19 23:20:00,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-19 23:20:00,816 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-19 23:20:00,817 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-19 23:20:00,817 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-19 23:20:01,108 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-19 23:20:01,122 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-19 23:20:01,125 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-19 23:20:01,127 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-19 23:20:01,127 INFO L275 PluginConnector]: CDTParser initialized [2020-07-19 23:20:01,128 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-19 23:20:01,191 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7d05bfb3/5203e3b6e7c54c78ad273794f6058957/FLAGae09a1f3e [2020-07-19 23:20:01,653 INFO L306 CDTParser]: Found 1 translation units. [2020-07-19 23:20:01,654 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-19 23:20:01,661 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7d05bfb3/5203e3b6e7c54c78ad273794f6058957/FLAGae09a1f3e [2020-07-19 23:20:02,083 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b7d05bfb3/5203e3b6e7c54c78ad273794f6058957 [2020-07-19 23:20:02,096 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-19 23:20:02,100 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-19 23:20:02,103 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-19 23:20:02,103 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-19 23:20:02,107 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-19 23:20:02,108 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,111 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67b72023 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02, skipping insertion in model container [2020-07-19 23:20:02,111 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,120 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-19 23:20:02,142 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-19 23:20:02,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-19 23:20:02,380 INFO L203 MainTranslator]: Completed pre-run [2020-07-19 23:20:02,398 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-19 23:20:02,497 INFO L208 MainTranslator]: Completed translation [2020-07-19 23:20:02,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02 WrapperNode [2020-07-19 23:20:02,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-19 23:20:02,500 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-19 23:20:02,500 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-19 23:20:02,500 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-19 23:20:02,514 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,527 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,527 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,551 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,564 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (1/1) ... [2020-07-19 23:20:02,566 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-19 23:20:02,566 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-19 23:20:02,566 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-19 23:20:02,566 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-19 23:20:02,567 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (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 [2020-07-19 23:20:02,629 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-19 23:20:02,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-19 23:20:02,630 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-19 23:20:02,630 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-19 23:20:02,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-19 23:20:02,630 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-19 23:20:02,630 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-19 23:20:02,630 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-19 23:20:02,631 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-19 23:20:02,875 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-19 23:20:02,875 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-19 23:20:02,881 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 11:20:02 BoogieIcfgContainer [2020-07-19 23:20:02,881 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-19 23:20:02,883 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-19 23:20:02,883 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-19 23:20:02,887 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-19 23:20:02,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.07 11:20:02" (1/3) ... [2020-07-19 23:20:02,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68de8f03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 11:20:02, skipping insertion in model container [2020-07-19 23:20:02,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 11:20:02" (2/3) ... [2020-07-19 23:20:02,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68de8f03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 11:20:02, skipping insertion in model container [2020-07-19 23:20:02,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 11:20:02" (3/3) ... [2020-07-19 23:20:02,892 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-07-19 23:20:02,905 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-19 23:20:02,914 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-19 23:20:02,931 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-19 23:20:02,990 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-19 23:20:02,990 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-19 23:20:02,991 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-19 23:20:02,991 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-19 23:20:02,991 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-19 23:20:02,994 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-19 23:20:02,996 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-19 23:20:02,996 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-19 23:20:03,024 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-19 23:20:03,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-19 23:20:03,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:03,031 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:03,032 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:03,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:03,037 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-07-19 23:20:03,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:03,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99757126] [2020-07-19 23:20:03,046 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:03,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,246 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:03,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99757126] [2020-07-19 23:20:03,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-19 23:20:03,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-19 23:20:03,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698051494] [2020-07-19 23:20:03,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-19 23:20:03,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:03,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-19 23:20:03,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-19 23:20:03,276 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-07-19 23:20:03,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:03,371 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-19 23:20:03,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-19 23:20:03,374 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-19 23:20:03,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:03,385 INFO L225 Difference]: With dead ends: 42 [2020-07-19 23:20:03,385 INFO L226 Difference]: Without dead ends: 20 [2020-07-19 23:20:03,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-19 23:20:03,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-19 23:20:03,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-19 23:20:03,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-19 23:20:03,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-19 23:20:03,436 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-19 23:20:03,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:03,437 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-19 23:20:03,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-19 23:20:03,437 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-19 23:20:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-19 23:20:03,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:03,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:03,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-19 23:20:03,440 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:03,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:03,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-07-19 23:20:03,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:03,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611441470] [2020-07-19 23:20:03,441 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:03,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:03,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611441470] [2020-07-19 23:20:03,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-19 23:20:03,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-19 23:20:03,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963819455] [2020-07-19 23:20:03,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-19 23:20:03,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:03,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-19 23:20:03,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-19 23:20:03,581 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-07-19 23:20:03,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:03,646 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-19 23:20:03,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-19 23:20:03,647 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-19 23:20:03,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:03,648 INFO L225 Difference]: With dead ends: 34 [2020-07-19 23:20:03,648 INFO L226 Difference]: Without dead ends: 22 [2020-07-19 23:20:03,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-19 23:20:03,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-19 23:20:03,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-19 23:20:03,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-19 23:20:03,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-19 23:20:03,658 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-19 23:20:03,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:03,659 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-19 23:20:03,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-19 23:20:03,660 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-19 23:20:03,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-19 23:20:03,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:03,661 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] [2020-07-19 23:20:03,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-19 23:20:03,661 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:03,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:03,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-07-19 23:20:03,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:03,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743166526] [2020-07-19 23:20:03,663 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:03,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:03,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:03,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743166526] [2020-07-19 23:20:03,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235721811] [2020-07-19 23:20:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3ec69d74 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:03,824 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3ec69d74 issued 3 check-sat command(s) [2020-07-19 23:20:03,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:03,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-19 23:20:03,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:03,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:03,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-07-19 23:20:03,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909897653] [2020-07-19 23:20:03,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-19 23:20:03,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:03,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-19 23:20:03,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-19 23:20:03,881 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-19 23:20:03,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:03,947 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-07-19 23:20:03,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-19 23:20:03,948 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-19 23:20:03,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:03,949 INFO L225 Difference]: With dead ends: 36 [2020-07-19 23:20:03,949 INFO L226 Difference]: Without dead ends: 24 [2020-07-19 23:20:03,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-19 23:20:03,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-19 23:20:03,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-07-19 23:20:03,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-19 23:20:03,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-07-19 23:20:03,957 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-07-19 23:20:03,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:03,958 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-07-19 23:20:03,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-19 23:20:03,958 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-07-19 23:20:03,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-19 23:20:03,959 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:03,959 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:04,173 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-19 23:20:04,174 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:04,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:04,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1739404943, now seen corresponding path program 2 times [2020-07-19 23:20:04,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:04,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279635737] [2020-07-19 23:20:04,176 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:04,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,325 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:04,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279635737] [2020-07-19 23:20:04,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102865073] [2020-07-19 23:20:04,326 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@55559d13 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:04,410 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@55559d13 issued 3 check-sat command(s) [2020-07-19 23:20:04,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:04,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-19 23:20:04,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:04,438 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:04,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:04,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-07-19 23:20:04,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324312639] [2020-07-19 23:20:04,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-19 23:20:04,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:04,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-19 23:20:04,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-19 23:20:04,444 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 7 states. [2020-07-19 23:20:04,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:04,533 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-07-19 23:20:04,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-19 23:20:04,533 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-07-19 23:20:04,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:04,534 INFO L225 Difference]: With dead ends: 38 [2020-07-19 23:20:04,534 INFO L226 Difference]: Without dead ends: 26 [2020-07-19 23:20:04,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-19 23:20:04,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-19 23:20:04,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-07-19 23:20:04,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-19 23:20:04,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-07-19 23:20:04,543 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-07-19 23:20:04,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:04,545 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-07-19 23:20:04,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-19 23:20:04,545 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-07-19 23:20:04,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-19 23:20:04,547 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:04,547 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:04,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:04,748 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:04,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:04,749 INFO L82 PathProgramCache]: Analyzing trace with hash -1328015311, now seen corresponding path program 3 times [2020-07-19 23:20:04,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:04,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329768891] [2020-07-19 23:20:04,749 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:04,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:04,826 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:04,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329768891] [2020-07-19 23:20:04,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1843973145] [2020-07-19 23:20:04,827 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4ea27478 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:04,937 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4ea27478 issued 3 check-sat command(s) [2020-07-19 23:20:04,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:04,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-19 23:20:04,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:04,962 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:04,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:04,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-07-19 23:20:04,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313619714] [2020-07-19 23:20:04,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-19 23:20:04,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:04,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-19 23:20:04,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-19 23:20:04,966 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 8 states. [2020-07-19 23:20:05,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:05,046 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-07-19 23:20:05,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-19 23:20:05,047 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-07-19 23:20:05,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:05,048 INFO L225 Difference]: With dead ends: 40 [2020-07-19 23:20:05,048 INFO L226 Difference]: Without dead ends: 28 [2020-07-19 23:20:05,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-19 23:20:05,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-19 23:20:05,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-07-19 23:20:05,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-19 23:20:05,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-19 23:20:05,057 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-07-19 23:20:05,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:05,058 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-19 23:20:05,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-19 23:20:05,060 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-19 23:20:05,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-19 23:20:05,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:05,062 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:05,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:05,264 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:05,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:05,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 4 times [2020-07-19 23:20:05,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:05,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949856877] [2020-07-19 23:20:05,266 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:05,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,351 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:05,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949856877] [2020-07-19 23:20:05,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47289283] [2020-07-19 23:20:05,352 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1881edb3 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:05,474 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@1881edb3 issued 3 check-sat command(s) [2020-07-19 23:20:05,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:05,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-19 23:20:05,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:05,496 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:05,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:05,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-07-19 23:20:05,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748933549] [2020-07-19 23:20:05,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-19 23:20:05,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:05,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-19 23:20:05,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-19 23:20:05,499 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-07-19 23:20:05,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:05,556 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-07-19 23:20:05,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-19 23:20:05,556 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-19 23:20:05,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:05,557 INFO L225 Difference]: With dead ends: 42 [2020-07-19 23:20:05,558 INFO L226 Difference]: Without dead ends: 30 [2020-07-19 23:20:05,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-19 23:20:05,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-19 23:20:05,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-07-19 23:20:05,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-19 23:20:05,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-07-19 23:20:05,564 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-07-19 23:20:05,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:05,565 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-07-19 23:20:05,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-19 23:20:05,565 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-07-19 23:20:05,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-19 23:20:05,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:05,566 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:05,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:05,781 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:05,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:05,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1787714037, now seen corresponding path program 5 times [2020-07-19 23:20:05,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:05,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179490591] [2020-07-19 23:20:05,782 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:05,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:05,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179490591] [2020-07-19 23:20:05,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1585246581] [2020-07-19 23:20:05,914 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@18a9903d No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:06,109 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@18a9903d issued 3 check-sat command(s) [2020-07-19 23:20:06,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:06,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-19 23:20:06,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:06,137 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:06,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:06,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-07-19 23:20:06,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201521016] [2020-07-19 23:20:06,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-19 23:20:06,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:06,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-19 23:20:06,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-07-19 23:20:06,140 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 10 states. [2020-07-19 23:20:06,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:06,212 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-07-19 23:20:06,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-19 23:20:06,213 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-07-19 23:20:06,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:06,214 INFO L225 Difference]: With dead ends: 44 [2020-07-19 23:20:06,214 INFO L226 Difference]: Without dead ends: 32 [2020-07-19 23:20:06,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-07-19 23:20:06,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-19 23:20:06,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-07-19 23:20:06,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-19 23:20:06,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-07-19 23:20:06,220 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-07-19 23:20:06,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:06,221 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-07-19 23:20:06,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-19 23:20:06,221 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-07-19 23:20:06,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-19 23:20:06,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:06,222 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:06,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-19 23:20:06,436 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:06,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:06,437 INFO L82 PathProgramCache]: Analyzing trace with hash 2147351063, now seen corresponding path program 6 times [2020-07-19 23:20:06,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:06,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436312216] [2020-07-19 23:20:06,438 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:06,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:06,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:06,598 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:06,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436312216] [2020-07-19 23:20:06,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660989318] [2020-07-19 23:20:06,599 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@62d186e9 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:06,948 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@62d186e9 issued 3 check-sat command(s) [2020-07-19 23:20:06,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:06,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-19 23:20:06,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:06,970 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:06,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:06,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-07-19 23:20:06,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081087507] [2020-07-19 23:20:06,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-19 23:20:06,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:06,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-19 23:20:06,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-07-19 23:20:06,972 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 11 states. [2020-07-19 23:20:07,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:07,054 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-07-19 23:20:07,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-19 23:20:07,054 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-07-19 23:20:07,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:07,055 INFO L225 Difference]: With dead ends: 46 [2020-07-19 23:20:07,055 INFO L226 Difference]: Without dead ends: 34 [2020-07-19 23:20:07,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-07-19 23:20:07,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-19 23:20:07,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-19 23:20:07,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-19 23:20:07,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-19 23:20:07,060 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-07-19 23:20:07,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:07,060 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-19 23:20:07,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-19 23:20:07,061 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-19 23:20:07,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-19 23:20:07,062 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:07,062 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:07,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:07,264 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:07,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:07,265 INFO L82 PathProgramCache]: Analyzing trace with hash -133817927, now seen corresponding path program 7 times [2020-07-19 23:20:07,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:07,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1165834594] [2020-07-19 23:20:07,266 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:07,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:07,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:07,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:07,369 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:07,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1165834594] [2020-07-19 23:20:07,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578930699] [2020-07-19 23:20:07,370 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7a75b005 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:08,338 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7a75b005 issued 3 check-sat command(s) [2020-07-19 23:20:08,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:08,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-19 23:20:08,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:08,380 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:08,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:08,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2020-07-19 23:20:08,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469537052] [2020-07-19 23:20:08,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-19 23:20:08,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:08,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-19 23:20:08,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-07-19 23:20:08,383 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 12 states. [2020-07-19 23:20:08,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:08,500 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-07-19 23:20:08,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-19 23:20:08,502 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-07-19 23:20:08,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:08,503 INFO L225 Difference]: With dead ends: 48 [2020-07-19 23:20:08,503 INFO L226 Difference]: Without dead ends: 36 [2020-07-19 23:20:08,504 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-07-19 23:20:08,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-19 23:20:08,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-07-19 23:20:08,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-19 23:20:08,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-07-19 23:20:08,515 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-07-19 23:20:08,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:08,516 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-07-19 23:20:08,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-19 23:20:08,516 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-07-19 23:20:08,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-19 23:20:08,517 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:08,520 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:08,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:08,729 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:08,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:08,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1903896357, now seen corresponding path program 8 times [2020-07-19 23:20:08,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:08,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605583168] [2020-07-19 23:20:08,731 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:08,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:08,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:08,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:08,843 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:08,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605583168] [2020-07-19 23:20:08,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581318938] [2020-07-19 23:20:08,844 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4d83ed12 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:09,812 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4d83ed12 issued 3 check-sat command(s) [2020-07-19 23:20:09,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:09,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-19 23:20:09,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:09,842 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:09,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:09,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-07-19 23:20:09,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961692800] [2020-07-19 23:20:09,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-19 23:20:09,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:09,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-19 23:20:09,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-07-19 23:20:09,844 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 13 states. [2020-07-19 23:20:09,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:09,939 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-07-19 23:20:09,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-19 23:20:09,939 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-07-19 23:20:09,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:09,940 INFO L225 Difference]: With dead ends: 50 [2020-07-19 23:20:09,941 INFO L226 Difference]: Without dead ends: 38 [2020-07-19 23:20:09,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-07-19 23:20:09,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-19 23:20:09,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-07-19 23:20:09,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-19 23:20:09,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-07-19 23:20:09,946 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-07-19 23:20:09,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:09,947 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-07-19 23:20:09,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-19 23:20:09,947 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-07-19 23:20:09,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-19 23:20:09,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:09,948 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:10,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-07-19 23:20:10,159 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:10,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:10,160 INFO L82 PathProgramCache]: Analyzing trace with hash -2142218371, now seen corresponding path program 9 times [2020-07-19 23:20:10,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:10,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716515547] [2020-07-19 23:20:10,161 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:10,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:10,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:10,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:10,330 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:10,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716515547] [2020-07-19 23:20:10,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095728269] [2020-07-19 23:20:10,331 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@59769759 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:11,432 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@59769759 issued 3 check-sat command(s) [2020-07-19 23:20:11,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:11,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-19 23:20:11,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:11,467 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:11,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:11,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2020-07-19 23:20:11,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [169633748] [2020-07-19 23:20:11,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-19 23:20:11,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:11,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-19 23:20:11,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-07-19 23:20:11,470 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 14 states. [2020-07-19 23:20:11,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:11,593 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-07-19 23:20:11,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-19 23:20:11,594 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-07-19 23:20:11,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:11,597 INFO L225 Difference]: With dead ends: 52 [2020-07-19 23:20:11,598 INFO L226 Difference]: Without dead ends: 40 [2020-07-19 23:20:11,599 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-07-19 23:20:11,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-19 23:20:11,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-07-19 23:20:11,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-19 23:20:11,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-19 23:20:11,607 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-07-19 23:20:11,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:11,609 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-19 23:20:11,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-19 23:20:11,609 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-19 23:20:11,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-19 23:20:11,611 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:11,611 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:11,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:11,815 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:11,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:11,816 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 10 times [2020-07-19 23:20:11,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:11,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1653060680] [2020-07-19 23:20:11,816 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:11,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:11,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:11,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:11,956 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:11,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1653060680] [2020-07-19 23:20:11,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1855880737] [2020-07-19 23:20:11,957 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5c069521 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:13,130 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5c069521 issued 3 check-sat command(s) [2020-07-19 23:20:13,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:13,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-19 23:20:13,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:13,173 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:13,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:13,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-07-19 23:20:13,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225776082] [2020-07-19 23:20:13,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-19 23:20:13,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:13,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-19 23:20:13,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-07-19 23:20:13,176 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 15 states. [2020-07-19 23:20:13,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:13,279 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-07-19 23:20:13,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-19 23:20:13,280 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 38 [2020-07-19 23:20:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:13,281 INFO L225 Difference]: With dead ends: 54 [2020-07-19 23:20:13,282 INFO L226 Difference]: Without dead ends: 42 [2020-07-19 23:20:13,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-07-19 23:20:13,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-19 23:20:13,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-07-19 23:20:13,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-19 23:20:13,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-07-19 23:20:13,289 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-07-19 23:20:13,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:13,290 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-07-19 23:20:13,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-19 23:20:13,290 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-07-19 23:20:13,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-19 23:20:13,291 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:13,291 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:13,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:13,506 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:13,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:13,507 INFO L82 PathProgramCache]: Analyzing trace with hash 972952385, now seen corresponding path program 11 times [2020-07-19 23:20:13,507 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:13,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123866578] [2020-07-19 23:20:13,508 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:13,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:13,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:13,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:13,667 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:13,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123866578] [2020-07-19 23:20:13,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529447989] [2020-07-19 23:20:13,668 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@52f2034c No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:15,975 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@52f2034c issued 4 check-sat command(s) [2020-07-19 23:20:15,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:15,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-19 23:20:15,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:16,016 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:16,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:16,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2020-07-19 23:20:16,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606500044] [2020-07-19 23:20:16,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-19 23:20:16,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:16,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-19 23:20:16,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-07-19 23:20:16,018 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 16 states. [2020-07-19 23:20:16,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:16,107 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-07-19 23:20:16,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-19 23:20:16,108 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 40 [2020-07-19 23:20:16,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:16,109 INFO L225 Difference]: With dead ends: 56 [2020-07-19 23:20:16,109 INFO L226 Difference]: Without dead ends: 44 [2020-07-19 23:20:16,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-07-19 23:20:16,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-19 23:20:16,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-07-19 23:20:16,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-19 23:20:16,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-07-19 23:20:16,115 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-07-19 23:20:16,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:16,115 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-07-19 23:20:16,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-19 23:20:16,116 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-07-19 23:20:16,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-19 23:20:16,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:16,117 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:16,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-07-19 23:20:16,318 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:16,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:16,318 INFO L82 PathProgramCache]: Analyzing trace with hash 845451363, now seen corresponding path program 12 times [2020-07-19 23:20:16,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:16,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327333496] [2020-07-19 23:20:16,319 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:16,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:16,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:16,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:16,484 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:16,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327333496] [2020-07-19 23:20:16,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857334164] [2020-07-19 23:20:16,485 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6d66a808 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:23,226 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6d66a808 issued 3 check-sat command(s) [2020-07-19 23:20:23,226 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:23,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-19 23:20:23,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:23,293 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:23,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:23,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2020-07-19 23:20:23,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933518776] [2020-07-19 23:20:23,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-19 23:20:23,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:23,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-19 23:20:23,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-07-19 23:20:23,296 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand 17 states. [2020-07-19 23:20:23,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:23,413 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-07-19 23:20:23,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-19 23:20:23,414 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 42 [2020-07-19 23:20:23,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:23,416 INFO L225 Difference]: With dead ends: 58 [2020-07-19 23:20:23,416 INFO L226 Difference]: Without dead ends: 46 [2020-07-19 23:20:23,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-07-19 23:20:23,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-19 23:20:23,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-07-19 23:20:23,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-19 23:20:23,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-19 23:20:23,424 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 42 [2020-07-19 23:20:23,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:23,424 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-19 23:20:23,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-19 23:20:23,424 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-19 23:20:23,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-19 23:20:23,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:23,427 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:23,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-07-19 23:20:23,636 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:23,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:23,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1423946491, now seen corresponding path program 13 times [2020-07-19 23:20:23,637 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:23,638 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1245937028] [2020-07-19 23:20:23,638 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:23,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:23,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:23,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:23,824 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:23,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1245937028] [2020-07-19 23:20:23,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601908393] [2020-07-19 23:20:23,826 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@73109020 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:20:26,521 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@73109020 issued 4 check-sat command(s) [2020-07-19 23:20:26,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:20:26,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-19 23:20:26,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:20:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:26,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:20:26,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2020-07-19 23:20:26,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64544482] [2020-07-19 23:20:26,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-19 23:20:26,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:20:26,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-19 23:20:26,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-07-19 23:20:26,569 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 18 states. [2020-07-19 23:20:26,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:20:26,697 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-07-19 23:20:26,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-19 23:20:26,697 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 44 [2020-07-19 23:20:26,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:20:26,699 INFO L225 Difference]: With dead ends: 60 [2020-07-19 23:20:26,699 INFO L226 Difference]: Without dead ends: 48 [2020-07-19 23:20:26,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-07-19 23:20:26,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-19 23:20:26,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-07-19 23:20:26,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-19 23:20:26,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2020-07-19 23:20:26,710 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 44 [2020-07-19 23:20:26,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:20:26,710 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2020-07-19 23:20:26,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-19 23:20:26,711 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2020-07-19 23:20:26,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-07-19 23:20:26,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:20:26,712 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:20:26,920 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-07-19 23:20:26,920 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:20:26,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:20:26,921 INFO L82 PathProgramCache]: Analyzing trace with hash -471897817, now seen corresponding path program 14 times [2020-07-19 23:20:26,921 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:20:26,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511417924] [2020-07-19 23:20:26,922 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:20:26,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:27,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:27,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:20:27,135 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:20:27,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511417924] [2020-07-19 23:20:27,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126472682] [2020-07-19 23:20:27,136 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6d25a620 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:21:06,283 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@6d25a620 issued 4 check-sat command(s) [2020-07-19 23:21:06,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:21:06,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-19 23:21:06,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:21:06,871 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:21:06,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:21:06,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2020-07-19 23:21:06,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972252445] [2020-07-19 23:21:06,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-19 23:21:06,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:21:06,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-19 23:21:06,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-07-19 23:21:06,874 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand 19 states. [2020-07-19 23:21:06,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:21:06,996 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-07-19 23:21:06,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-19 23:21:06,997 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 46 [2020-07-19 23:21:06,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:21:06,998 INFO L225 Difference]: With dead ends: 62 [2020-07-19 23:21:06,998 INFO L226 Difference]: Without dead ends: 50 [2020-07-19 23:21:06,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-07-19 23:21:07,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-19 23:21:07,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-07-19 23:21:07,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-19 23:21:07,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 50 transitions. [2020-07-19 23:21:07,005 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 50 transitions. Word has length 46 [2020-07-19 23:21:07,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:21:07,006 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 50 transitions. [2020-07-19 23:21:07,006 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-19 23:21:07,006 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 50 transitions. [2020-07-19 23:21:07,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-19 23:21:07,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:21:07,007 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:21:07,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:21:07,220 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:21:07,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:21:07,221 INFO L82 PathProgramCache]: Analyzing trace with hash -381156151, now seen corresponding path program 15 times [2020-07-19 23:21:07,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:21:07,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653858661] [2020-07-19 23:21:07,222 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:21:07,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:07,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:07,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:07,489 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:21:07,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653858661] [2020-07-19 23:21:07,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930437922] [2020-07-19 23:21:07,490 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@63909a6e No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:21:18,302 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@63909a6e issued 4 check-sat command(s) [2020-07-19 23:21:18,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:21:18,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-19 23:21:18,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:21:18,393 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:21:18,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:21:18,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2020-07-19 23:21:18,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129109610] [2020-07-19 23:21:18,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-19 23:21:18,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:21:18,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-19 23:21:18,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-07-19 23:21:18,395 INFO L87 Difference]: Start difference. First operand 49 states and 50 transitions. Second operand 20 states. [2020-07-19 23:21:18,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:21:18,526 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-07-19 23:21:18,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-19 23:21:18,526 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 48 [2020-07-19 23:21:18,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:21:18,527 INFO L225 Difference]: With dead ends: 64 [2020-07-19 23:21:18,528 INFO L226 Difference]: Without dead ends: 52 [2020-07-19 23:21:18,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-07-19 23:21:18,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-19 23:21:18,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-07-19 23:21:18,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-19 23:21:18,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-19 23:21:18,534 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 48 [2020-07-19 23:21:18,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:21:18,534 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-19 23:21:18,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-19 23:21:18,535 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-19 23:21:18,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-07-19 23:21:18,535 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:21:18,535 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:21:18,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-07-19 23:21:18,737 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:21:18,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:21:18,737 INFO L82 PathProgramCache]: Analyzing trace with hash 922238955, now seen corresponding path program 16 times [2020-07-19 23:21:18,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:21:18,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713422557] [2020-07-19 23:21:18,739 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:21:18,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:18,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:18,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:21:18,990 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:21:18,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713422557] [2020-07-19 23:21:18,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [286226154] [2020-07-19 23:21:18,991 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@79616def No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:22:24,666 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@79616def issued 4 check-sat command(s) [2020-07-19 23:22:24,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:22:25,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-19 23:22:25,728 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:22:25,761 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:22:25,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:22:25,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2020-07-19 23:22:25,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886076306] [2020-07-19 23:22:25,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-19 23:22:25,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:22:25,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-19 23:22:25,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-07-19 23:22:25,763 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 21 states. [2020-07-19 23:22:25,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:22:25,857 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-07-19 23:22:25,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-19 23:22:25,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 50 [2020-07-19 23:22:25,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:22:25,859 INFO L225 Difference]: With dead ends: 66 [2020-07-19 23:22:25,859 INFO L226 Difference]: Without dead ends: 54 [2020-07-19 23:22:25,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-07-19 23:22:25,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-19 23:22:25,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-07-19 23:22:25,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-19 23:22:25,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2020-07-19 23:22:25,864 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 50 [2020-07-19 23:22:25,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:22:25,864 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2020-07-19 23:22:25,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-19 23:22:25,864 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2020-07-19 23:22:25,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-19 23:22:25,865 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:22:25,865 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:22:26,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-07-19 23:22:26,076 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:22:26,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:22:26,077 INFO L82 PathProgramCache]: Analyzing trace with hash -645514611, now seen corresponding path program 17 times [2020-07-19 23:22:26,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:22:26,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527532912] [2020-07-19 23:22:26,078 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:22:26,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:22:26,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:22:26,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:22:26,355 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:22:26,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527532912] [2020-07-19 23:22:26,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660510825] [2020-07-19 23:22:26,356 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@744156f3 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:29:39,639 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@744156f3 issued 4 check-sat command(s) [2020-07-19 23:29:39,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:29:53,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-19 23:29:53,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:29:53,595 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:29:53,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:29:53,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2020-07-19 23:29:53,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680061504] [2020-07-19 23:29:53,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-19 23:29:53,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:29:53,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-19 23:29:53,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-07-19 23:29:53,598 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 22 states. [2020-07-19 23:29:53,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:29:53,697 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-07-19 23:29:53,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-19 23:29:53,709 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 52 [2020-07-19 23:29:53,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:29:53,710 INFO L225 Difference]: With dead ends: 68 [2020-07-19 23:29:53,710 INFO L226 Difference]: Without dead ends: 56 [2020-07-19 23:29:53,711 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-07-19 23:29:53,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-19 23:29:53,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-07-19 23:29:53,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-19 23:29:53,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2020-07-19 23:29:53,716 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 52 [2020-07-19 23:29:53,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:29:53,716 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2020-07-19 23:29:53,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-19 23:29:53,716 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2020-07-19 23:29:53,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-19 23:29:53,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:29:53,717 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:29:53,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:29:53,925 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:29:53,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:29:53,926 INFO L82 PathProgramCache]: Analyzing trace with hash 276829359, now seen corresponding path program 18 times [2020-07-19 23:29:53,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:29:53,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94321820] [2020-07-19 23:29:53,927 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:29:53,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:29:54,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:29:54,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:29:54,215 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:29:54,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94321820] [2020-07-19 23:29:54,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [129186176] [2020-07-19 23:29:54,216 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3b65c18f No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:31:51,962 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3b65c18f issued 4 check-sat command(s) [2020-07-19 23:31:51,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-19 23:31:54,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-19 23:31:54,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 23:31:54,303 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:31:54,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 23:31:54,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2020-07-19 23:31:54,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338040840] [2020-07-19 23:31:54,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-19 23:31:54,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-19 23:31:54,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-19 23:31:54,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-07-19 23:31:54,305 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand 23 states. [2020-07-19 23:31:54,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 23:31:54,432 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-07-19 23:31:54,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-19 23:31:54,433 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 54 [2020-07-19 23:31:54,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 23:31:54,434 INFO L225 Difference]: With dead ends: 70 [2020-07-19 23:31:54,434 INFO L226 Difference]: Without dead ends: 58 [2020-07-19 23:31:54,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-07-19 23:31:54,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-19 23:31:54,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-07-19 23:31:54,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-19 23:31:54,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-19 23:31:54,440 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 54 [2020-07-19 23:31:54,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 23:31:54,440 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-19 23:31:54,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-19 23:31:54,440 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-19 23:31:54,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-19 23:31:54,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 23:31:54,441 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 23:31:54,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 23:31:54,652 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 23:31:54,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 23:31:54,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1886121553, now seen corresponding path program 19 times [2020-07-19 23:31:54,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-19 23:31:54,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741207960] [2020-07-19 23:31:54,654 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5804a18c [2020-07-19 23:31:54,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:31:54,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:31:54,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 23:31:54,956 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 23:31:54,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741207960] [2020-07-19 23:31:54,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1662644099] [2020-07-19 23:31:54,957 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@353f50da No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true