/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 23:01:07,727 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 23:01:07,730 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 23:01:07,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 23:01:07,786 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 23:01:07,786 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 23:01:07,787 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 23:01:07,788 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 23:01:07,789 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 23:01:07,790 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 23:01:07,791 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 23:01:07,793 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 23:01:07,794 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 23:01:07,795 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 23:01:07,796 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 23:01:07,797 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 23:01:07,799 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 23:01:07,806 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 23:01:07,807 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 23:01:07,807 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 23:01:07,808 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 23:01:07,817 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 23:01:07,818 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 23:01:07,819 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 23:01:07,819 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 23:01:07,820 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 23:01:07,821 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 23:01:07,821 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 23:01:07,821 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 23:01:07,821 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 23:01:07,822 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 23:01:07,822 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 23:01:07,822 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 23:01:07,822 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 23:01:07,822 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:07,823 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 23:01:07,823 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 23:01:07,823 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 23:01:07,823 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 23:01:08,114 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 23:01:08,130 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 23:01:08,136 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 23:01:08,138 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 23:01:08,139 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 23:01:08,139 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 23:01:08,216 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d081f9a9/83c68e382f824d8ebb2c12b044f3ec78/FLAGb7f48be5d [2020-08-22 23:01:08,623 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 23:01:08,624 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 23:01:08,630 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d081f9a9/83c68e382f824d8ebb2c12b044f3ec78/FLAGb7f48be5d [2020-08-22 23:01:09,042 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0d081f9a9/83c68e382f824d8ebb2c12b044f3ec78 [2020-08-22 23:01:09,050 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 23:01:09,052 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 23:01:09,053 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:09,053 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 23:01:09,056 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 23:01:09,058 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,061 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5fd2c704 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09, skipping insertion in model container [2020-08-22 23:01:09,061 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,068 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 23:01:09,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 23:01:09,250 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:09,253 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 23:01:09,274 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:09,293 INFO L208 MainTranslator]: Completed translation [2020-08-22 23:01:09,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09 WrapperNode [2020-08-22 23:01:09,294 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:09,295 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 23:01:09,295 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 23:01:09,295 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 23:01:09,389 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,397 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,397 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,405 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,413 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (1/1) ... [2020-08-22 23:01:09,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 23:01:09,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 23:01:09,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 23:01:09,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 23:01:09,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (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 [2020-08-22 23:01:09,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 23:01:09,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 23:01:09,496 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 23:01:09,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 23:01:09,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 23:01:09,496 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 23:01:09,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 23:01:09,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 23:01:09,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 23:01:09,497 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 23:01:09,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 23:01:09,498 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 23:01:09,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 23:01:09,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 23:01:09,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 23:01:09,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 23:01:09,815 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 23:01:09,815 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 23:01:09,820 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:09 BoogieIcfgContainer [2020-08-22 23:01:09,820 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 23:01:09,821 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 23:01:09,821 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 23:01:09,824 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 23:01:09,824 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 11:01:09" (1/3) ... [2020-08-22 23:01:09,825 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3940801d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:09, skipping insertion in model container [2020-08-22 23:01:09,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:09" (2/3) ... [2020-08-22 23:01:09,826 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3940801d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:09, skipping insertion in model container [2020-08-22 23:01:09,826 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:09" (3/3) ... [2020-08-22 23:01:09,828 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-22 23:01:09,839 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 23:01:09,847 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 23:01:09,862 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 23:01:09,885 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 23:01:09,886 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 23:01:09,886 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 23:01:09,886 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 23:01:09,886 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 23:01:09,886 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 23:01:09,887 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 23:01:09,887 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 23:01:09,916 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-08-22 23:01:09,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 23:01:09,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:09,933 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:09,933 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:09,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:09,938 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-08-22 23:01:09,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:09,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068340659] [2020-08-22 23:01:09,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:10,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:10,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:10,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:10,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:10,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068340659] [2020-08-22 23:01:10,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:10,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 23:01:10,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353915397] [2020-08-22 23:01:10,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 23:01:10,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:10,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 23:01:10,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:01:10,203 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 3 states. [2020-08-22 23:01:10,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:10,440 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2020-08-22 23:01:10,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 23:01:10,443 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-08-22 23:01:10,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:10,454 INFO L225 Difference]: With dead ends: 121 [2020-08-22 23:01:10,454 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 23:01:10,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:01:10,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 23:01:10,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 23:01:10,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 23:01:10,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-08-22 23:01:10,515 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 31 [2020-08-22 23:01:10,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:10,516 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-08-22 23:01:10,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 23:01:10,517 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-08-22 23:01:10,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 23:01:10,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:10,519 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:10,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 23:01:10,520 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:10,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:10,520 INFO L82 PathProgramCache]: Analyzing trace with hash -318765620, now seen corresponding path program 1 times [2020-08-22 23:01:10,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:10,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487535453] [2020-08-22 23:01:10,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:10,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:10,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:10,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:10,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:10,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487535453] [2020-08-22 23:01:10,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:10,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 23:01:10,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244585166] [2020-08-22 23:01:10,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 23:01:10,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:10,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 23:01:10,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 23:01:10,651 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 5 states. [2020-08-22 23:01:10,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:10,889 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-08-22 23:01:10,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 23:01:10,890 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-08-22 23:01:10,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:10,894 INFO L225 Difference]: With dead ends: 107 [2020-08-22 23:01:10,894 INFO L226 Difference]: Without dead ends: 74 [2020-08-22 23:01:10,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:10,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-22 23:01:10,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2020-08-22 23:01:10,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 23:01:10,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-22 23:01:10,917 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-08-22 23:01:10,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:10,918 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-22 23:01:10,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 23:01:10,919 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-22 23:01:10,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 23:01:10,920 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:10,920 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:10,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 23:01:10,921 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:10,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:10,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1837873718, now seen corresponding path program 1 times [2020-08-22 23:01:10,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:10,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181059067] [2020-08-22 23:01:10,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:10,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:11,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:11,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:11,092 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 23:01:11,093 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181059067] [2020-08-22 23:01:11,093 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:11,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 23:01:11,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430674950] [2020-08-22 23:01:11,094 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 23:01:11,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:11,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 23:01:11,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 23:01:11,095 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 5 states. [2020-08-22 23:01:11,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:11,300 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2020-08-22 23:01:11,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 23:01:11,301 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-22 23:01:11,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:11,302 INFO L225 Difference]: With dead ends: 95 [2020-08-22 23:01:11,303 INFO L226 Difference]: Without dead ends: 75 [2020-08-22 23:01:11,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 23:01:11,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-22 23:01:11,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 59. [2020-08-22 23:01:11,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 23:01:11,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-08-22 23:01:11,317 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 38 [2020-08-22 23:01:11,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:11,317 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-08-22 23:01:11,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 23:01:11,318 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-08-22 23:01:11,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 23:01:11,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:11,319 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:11,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 23:01:11,320 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:11,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:11,320 INFO L82 PathProgramCache]: Analyzing trace with hash -2141827952, now seen corresponding path program 1 times [2020-08-22 23:01:11,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:11,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [247674704] [2020-08-22 23:01:11,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:11,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:12,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:12,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:12,528 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:12,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [247674704] [2020-08-22 23:01:12,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:12,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 23:01:12,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64643146] [2020-08-22 23:01:12,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 23:01:12,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:12,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 23:01:12,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-08-22 23:01:12,534 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 19 states. [2020-08-22 23:01:14,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:14,199 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2020-08-22 23:01:14,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 23:01:14,200 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-08-22 23:01:14,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:14,204 INFO L225 Difference]: With dead ends: 164 [2020-08-22 23:01:14,204 INFO L226 Difference]: Without dead ends: 162 [2020-08-22 23:01:14,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=353, Invalid=1369, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 23:01:14,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-08-22 23:01:14,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 90. [2020-08-22 23:01:14,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-22 23:01:14,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2020-08-22 23:01:14,257 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 48 [2020-08-22 23:01:14,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:14,259 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2020-08-22 23:01:14,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 23:01:14,260 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2020-08-22 23:01:14,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 23:01:14,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:14,268 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:14,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 23:01:14,268 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:14,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:14,269 INFO L82 PathProgramCache]: Analyzing trace with hash -523876270, now seen corresponding path program 2 times [2020-08-22 23:01:14,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:14,270 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816087751] [2020-08-22 23:01:14,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:14,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:14,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:14,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:14,391 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:14,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816087751] [2020-08-22 23:01:14,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:14,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 23:01:14,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377934043] [2020-08-22 23:01:14,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 23:01:14,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:14,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 23:01:14,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-22 23:01:14,393 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand 9 states. [2020-08-22 23:01:14,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:14,755 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-08-22 23:01:14,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 23:01:14,755 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-08-22 23:01:14,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:14,759 INFO L225 Difference]: With dead ends: 171 [2020-08-22 23:01:14,759 INFO L226 Difference]: Without dead ends: 151 [2020-08-22 23:01:14,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:14,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-08-22 23:01:14,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 100. [2020-08-22 23:01:14,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 23:01:14,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2020-08-22 23:01:14,783 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 55 [2020-08-22 23:01:14,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:14,783 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2020-08-22 23:01:14,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 23:01:14,783 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2020-08-22 23:01:14,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 23:01:14,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:14,785 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:14,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 23:01:14,785 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:14,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:14,786 INFO L82 PathProgramCache]: Analyzing trace with hash -2134174762, now seen corresponding path program 3 times [2020-08-22 23:01:14,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:14,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [847763262] [2020-08-22 23:01:14,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:14,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:14,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:14,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:14,873 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:14,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [847763262] [2020-08-22 23:01:14,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:14,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:14,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [985843426] [2020-08-22 23:01:14,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:14,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:14,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:14,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:14,875 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand 10 states. [2020-08-22 23:01:15,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:15,204 INFO L93 Difference]: Finished difference Result 165 states and 172 transitions. [2020-08-22 23:01:15,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 23:01:15,205 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 58 [2020-08-22 23:01:15,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:15,206 INFO L225 Difference]: With dead ends: 165 [2020-08-22 23:01:15,206 INFO L226 Difference]: Without dead ends: 135 [2020-08-22 23:01:15,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-08-22 23:01:15,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-08-22 23:01:15,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 100. [2020-08-22 23:01:15,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 23:01:15,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2020-08-22 23:01:15,235 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 58 [2020-08-22 23:01:15,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:15,235 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2020-08-22 23:01:15,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:15,235 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2020-08-22 23:01:15,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-22 23:01:15,237 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:15,237 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:15,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 23:01:15,237 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:15,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:15,238 INFO L82 PathProgramCache]: Analyzing trace with hash -280271430, now seen corresponding path program 1 times [2020-08-22 23:01:15,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:15,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585203607] [2020-08-22 23:01:15,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:15,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:15,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:15,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:15,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-08-22 23:01:15,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:15,349 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 23:01:15,349 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585203607] [2020-08-22 23:01:15,350 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:15,350 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:15,350 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135534662] [2020-08-22 23:01:15,351 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:15,351 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:15,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:15,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:15,352 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand 10 states. [2020-08-22 23:01:15,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:15,609 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2020-08-22 23:01:15,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 23:01:15,610 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-08-22 23:01:15,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:15,611 INFO L225 Difference]: With dead ends: 143 [2020-08-22 23:01:15,611 INFO L226 Difference]: Without dead ends: 92 [2020-08-22 23:01:15,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:15,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-22 23:01:15,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 76. [2020-08-22 23:01:15,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 23:01:15,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-22 23:01:15,626 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 64 [2020-08-22 23:01:15,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:15,626 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-22 23:01:15,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:15,626 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-22 23:01:15,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-22 23:01:15,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:15,627 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:15,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 23:01:15,628 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:15,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:15,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1930216728, now seen corresponding path program 4 times [2020-08-22 23:01:15,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:15,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1339994628] [2020-08-22 23:01:15,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:15,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:16,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:16,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:16,413 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:16,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1339994628] [2020-08-22 23:01:16,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:16,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 23:01:16,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361435775] [2020-08-22 23:01:16,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 23:01:16,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:16,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 23:01:16,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2020-08-22 23:01:16,416 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 23 states. [2020-08-22 23:01:18,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:18,215 INFO L93 Difference]: Finished difference Result 191 states and 200 transitions. [2020-08-22 23:01:18,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 23:01:18,215 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2020-08-22 23:01:18,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:18,217 INFO L225 Difference]: With dead ends: 191 [2020-08-22 23:01:18,217 INFO L226 Difference]: Without dead ends: 189 [2020-08-22 23:01:18,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=499, Invalid=2693, Unknown=0, NotChecked=0, Total=3192 [2020-08-22 23:01:18,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-08-22 23:01:18,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 117. [2020-08-22 23:01:18,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-22 23:01:18,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2020-08-22 23:01:18,258 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 65 [2020-08-22 23:01:18,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:18,259 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2020-08-22 23:01:18,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 23:01:18,259 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2020-08-22 23:01:18,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-22 23:01:18,260 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:18,261 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:18,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 23:01:18,261 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:18,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:18,262 INFO L82 PathProgramCache]: Analyzing trace with hash 499090838, now seen corresponding path program 5 times [2020-08-22 23:01:18,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:18,262 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267522735] [2020-08-22 23:01:18,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:18,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:18,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:18,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:18,374 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:18,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267522735] [2020-08-22 23:01:18,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:18,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:18,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189041770] [2020-08-22 23:01:18,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:18,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:18,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:18,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:18,377 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 12 states. [2020-08-22 23:01:18,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:18,847 INFO L93 Difference]: Finished difference Result 193 states and 202 transitions. [2020-08-22 23:01:18,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 23:01:18,847 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 72 [2020-08-22 23:01:18,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:18,849 INFO L225 Difference]: With dead ends: 193 [2020-08-22 23:01:18,849 INFO L226 Difference]: Without dead ends: 173 [2020-08-22 23:01:18,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-08-22 23:01:18,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-08-22 23:01:18,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 127. [2020-08-22 23:01:18,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-22 23:01:18,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2020-08-22 23:01:18,871 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 72 [2020-08-22 23:01:18,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:18,871 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2020-08-22 23:01:18,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:18,872 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2020-08-22 23:01:18,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 23:01:18,873 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:18,873 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:18,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 23:01:18,873 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:18,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:18,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1430946398, now seen corresponding path program 6 times [2020-08-22 23:01:18,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:18,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320314026] [2020-08-22 23:01:18,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:18,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:18,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:18,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:18,990 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 33 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:18,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320314026] [2020-08-22 23:01:18,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:18,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 23:01:18,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144067255] [2020-08-22 23:01:18,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 23:01:18,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:18,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 23:01:18,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-22 23:01:18,993 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand 13 states. [2020-08-22 23:01:19,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:19,408 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2020-08-22 23:01:19,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 23:01:19,409 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 75 [2020-08-22 23:01:19,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:19,410 INFO L225 Difference]: With dead ends: 192 [2020-08-22 23:01:19,410 INFO L226 Difference]: Without dead ends: 162 [2020-08-22 23:01:19,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-08-22 23:01:19,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-08-22 23:01:19,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 127. [2020-08-22 23:01:19,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-22 23:01:19,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2020-08-22 23:01:19,433 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 75 [2020-08-22 23:01:19,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:19,434 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2020-08-22 23:01:19,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 23:01:19,434 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2020-08-22 23:01:19,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 23:01:19,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:19,436 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:19,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 23:01:19,436 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:19,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:19,437 INFO L82 PathProgramCache]: Analyzing trace with hash 810536514, now seen corresponding path program 2 times [2020-08-22 23:01:19,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:19,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1688178978] [2020-08-22 23:01:19,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:19,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:19,456 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:19,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:19,478 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:19,514 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 23:01:19,514 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 23:01:19,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 23:01:19,567 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 11:01:19 BoogieIcfgContainer [2020-08-22 23:01:19,567 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 23:01:19,570 INFO L168 Benchmark]: Toolchain (without parser) took 10517.54 ms. Allocated memory was 138.9 MB in the beginning and 328.2 MB in the end (delta: 189.3 MB). Free memory was 102.7 MB in the beginning and 269.7 MB in the end (delta: -167.1 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,571 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,571 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.60 ms. Allocated memory is still 138.9 MB. Free memory was 102.5 MB in the beginning and 92.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,572 INFO L168 Benchmark]: Boogie Preprocessor took 122.32 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.1 MB in the beginning and 180.2 MB in the end (delta: -88.1 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,573 INFO L168 Benchmark]: RCFGBuilder took 402.71 ms. Allocated memory is still 202.9 MB. Free memory was 180.2 MB in the beginning and 160.9 MB in the end (delta: 19.2 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,574 INFO L168 Benchmark]: TraceAbstraction took 9746.16 ms. Allocated memory was 202.9 MB in the beginning and 328.2 MB in the end (delta: 125.3 MB). Free memory was 160.2 MB in the beginning and 269.7 MB in the end (delta: -109.5 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:19,577 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 241.60 ms. Allocated memory is still 138.9 MB. Free memory was 102.5 MB in the beginning and 92.1 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.32 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.1 MB in the beginning and 180.2 MB in the end (delta: -88.1 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 402.71 ms. Allocated memory is still 202.9 MB. Free memory was 180.2 MB in the beginning and 160.9 MB in the end (delta: 19.2 MB). Peak memory consumption was 19.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9746.16 ms. Allocated memory was 202.9 MB in the beginning and 328.2 MB in the end (delta: 125.3 MB). Free memory was 160.2 MB in the beginning and 269.7 MB in the end (delta: -109.5 MB). Peak memory consumption was 15.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); VAL [__VERIFIER_nondet_uint()=2, MAX=2] [L15] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L16] char str1[MAX], str2[MAX]; VAL [MAX=2, str1={4:0}, str2={3:0}] [L17] int cont, i, j; VAL [MAX=2, str1={4:0}, str2={3:0}] [L18] cont = 0 VAL [cont=0, MAX=2, str1={4:0}, str2={3:0}] [L20] i=0 VAL [cont=0, i=0, MAX=2, str1={4:0}, str2={3:0}] [L20] COND TRUE i= 0 VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str2={3:0}] [L28] EXPR str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str1[0]=-1, str2={3:0}] [L28] str2[j] = str1[0] VAL [cont=0, i=1, j=0, MAX=2, str1={4:0}, str1[0]=-1, str2={3:0}] [L29] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={4:0}, str2={3:0}] [L27] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={3:0}] [L27] COND TRUE i >= 0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={3:0}] [L28] EXPR str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str1[0]=-1, str2={3:0}] [L28] str2[j] = str1[0] VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str1[0]=-1, str2={3:0}] [L29] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={4:0}, str2={3:0}] [L27] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={3:0}] [L27] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={4:0}, str2={3:0}] [L32] j = MAX-1 VAL [cont=0, i=-1, j=1, MAX=2, str1={4:0}, str2={3:0}] [L33] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={4:0}, str2={3:0}] [L33] COND TRUE i