/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:56:58,581 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:56:58,585 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:56:58,626 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:56:58,627 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:56:58,635 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:56:58,637 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:56:58,641 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:56:58,644 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:56:58,647 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:56:58,648 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:56:58,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 16:56:58,654 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 16:56:58,658 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 16:56:58,665 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 16:56:58,666 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 16:56:58,669 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 16:56:58,671 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 16:56:58,673 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 16:56:58,681 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 16:56:58,684 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 16:56:58,686 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 16:56:58,687 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 16:56:58,688 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 16:56:58,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 16:56:58,722 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 16:56:58,723 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 16:56:58,725 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 16:56:58,726 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 [2020-08-22 16:56:58,771 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:56:58,771 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:56:58,774 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:56:58,774 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:56:58,774 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:56:58,775 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:56:58,775 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:56:58,775 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:56:58,776 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:56:58,776 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:56:58,777 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:56:58,778 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:56:58,778 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:56:58,778 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:56:58,779 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:56:58,779 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:56:58,779 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:56:58,779 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:56:58,779 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:56:58,780 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:56:58,780 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:56:58,780 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:56:58,780 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:56:58,780 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:56:58,781 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:56:58,781 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:56:58,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:56:58,781 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:56:58,781 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:56:58,782 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:56:59,088 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:56:59,107 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:56:59,113 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:56:59,115 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:56:59,115 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:56:59,116 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 16:56:59,183 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94d5fc677/7f3ee8088bb243a58dede20f0b93c481/FLAG31478f4dc [2020-08-22 16:56:59,633 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:56:59,634 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 16:56:59,642 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94d5fc677/7f3ee8088bb243a58dede20f0b93c481/FLAG31478f4dc [2020-08-22 16:57:00,058 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/94d5fc677/7f3ee8088bb243a58dede20f0b93c481 [2020-08-22 16:57:00,069 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:57:00,071 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:57:00,075 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:00,075 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:57:00,079 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:57:00,080 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,083 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5be6eb65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00, skipping insertion in model container [2020-08-22 16:57:00,084 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,092 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:57:00,111 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:57:00,288 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:00,293 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:57:00,314 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:00,334 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:57:00,334 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00 WrapperNode [2020-08-22 16:57:00,334 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:00,335 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:57:00,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:57:00,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:57:00,444 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,446 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,472 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,480 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (1/1) ... [2020-08-22 16:57:00,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:57:00,483 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:57:00,483 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:57:00,483 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:57:00,484 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (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 16:57:00,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:57:00,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:57:00,552 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 16:57:00,552 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 16:57:00,553 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:57:00,554 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:57:00,890 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:57:00,891 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 16:57:00,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:00 BoogieIcfgContainer [2020-08-22 16:57:00,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:57:00,896 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:57:00,897 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:57:00,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:57:00,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:57:00" (1/3) ... [2020-08-22 16:57:00,901 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb533ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:00, skipping insertion in model container [2020-08-22 16:57:00,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:00" (2/3) ... [2020-08-22 16:57:00,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb533ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:00, skipping insertion in model container [2020-08-22 16:57:00,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:00" (3/3) ... [2020-08-22 16:57:00,904 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-22 16:57:00,915 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:57:00,922 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:57:00,938 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:57:00,960 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:57:00,960 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:57:00,960 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:57:00,960 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:57:00,961 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:57:00,961 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:57:00,961 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:57:00,961 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:57:00,980 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-22 16:57:00,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 16:57:00,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:00,987 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:00,988 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:00,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:00,993 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-22 16:57:01,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:01,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434035097] [2020-08-22 16:57:01,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:01,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:01,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,183 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 16:57:01,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434035097] [2020-08-22 16:57:01,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:01,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 16:57:01,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470374448] [2020-08-22 16:57:01,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 16:57:01,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:01,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 16:57:01,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 16:57:01,213 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-22 16:57:01,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:01,357 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-22 16:57:01,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 16:57:01,360 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 16:57:01,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:01,374 INFO L225 Difference]: With dead ends: 51 [2020-08-22 16:57:01,374 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 16:57:01,380 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 16:57:01,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 16:57:01,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 16:57:01,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 16:57:01,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 16:57:01,434 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-22 16:57:01,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:01,435 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 16:57:01,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 16:57:01,436 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 16:57:01,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 16:57:01,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:01,438 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:01,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:57:01,440 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:01,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:01,441 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-22 16:57:01,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:01,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413917734] [2020-08-22 16:57:01,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:01,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:01,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,582 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 16:57:01,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413917734] [2020-08-22 16:57:01,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:01,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 16:57:01,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242237152] [2020-08-22 16:57:01,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:57:01,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:01,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:57:01,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:57:01,590 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-22 16:57:01,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:01,763 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-22 16:57:01,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:57:01,764 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 16:57:01,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:01,768 INFO L225 Difference]: With dead ends: 44 [2020-08-22 16:57:01,769 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 16:57:01,771 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 16:57:01,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 16:57:01,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-22 16:57:01,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 16:57:01,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-22 16:57:01,808 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-22 16:57:01,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:01,809 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-22 16:57:01,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:57:01,809 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-22 16:57:01,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 16:57:01,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:01,810 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:01,810 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 16:57:01,811 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:01,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:01,812 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-22 16:57:01,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:01,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119903915] [2020-08-22 16:57:01,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:01,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:01,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:01,938 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 16:57:01,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119903915] [2020-08-22 16:57:01,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:01,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 16:57:01,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520340716] [2020-08-22 16:57:01,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:57:01,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:01,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:57:01,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:57:01,941 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-22 16:57:02,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:02,078 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 16:57:02,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:57:02,079 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-22 16:57:02,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:02,080 INFO L225 Difference]: With dead ends: 37 [2020-08-22 16:57:02,080 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 16:57:02,081 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 16:57:02,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 16:57:02,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 16:57:02,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 16:57:02,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 16:57:02,089 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-22 16:57:02,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:02,090 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 16:57:02,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:57:02,090 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 16:57:02,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 16:57:02,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:02,092 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:02,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 16:57:02,092 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:02,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:02,093 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-22 16:57:02,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:02,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193805776] [2020-08-22 16:57:02,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:02,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:02,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:02,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:02,560 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 16:57:02,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193805776] [2020-08-22 16:57:02,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350207364] [2020-08-22 16:57:02,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -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 [2020-08-22 16:57:02,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:02,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 22 conjunts are in the unsatisfiable core [2020-08-22 16:57:02,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:02,703 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-08-22 16:57:02,705 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:02,714 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:02,714 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:02,715 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-08-22 16:57:02,851 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2020-08-22 16:57:02,852 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:02,860 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:02,861 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:02,862 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2020-08-22 16:57:02,982 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:02,983 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 20 [2020-08-22 16:57:02,984 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-08-22 16:57:03,001 INFO L625 ElimStorePlain]: treesize reduction 7, result has 66.7 percent of original size [2020-08-22 16:57:03,006 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:03,006 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:38, output treesize:3 [2020-08-22 16:57:03,049 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 16:57:03,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:03,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2020-08-22 16:57:03,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259169646] [2020-08-22 16:57:03,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 16:57:03,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:03,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 16:57:03,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2020-08-22 16:57:03,053 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 21 states. [2020-08-22 16:57:03,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:03,688 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2020-08-22 16:57:03,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 16:57:03,690 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2020-08-22 16:57:03,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:03,693 INFO L225 Difference]: With dead ends: 48 [2020-08-22 16:57:03,693 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 16:57:03,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=181, Invalid=811, Unknown=0, NotChecked=0, Total=992 [2020-08-22 16:57:03,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 16:57:03,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2020-08-22 16:57:03,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 16:57:03,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 16:57:03,713 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-22 16:57:03,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:03,713 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 16:57:03,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 16:57:03,714 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 16:57:03,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 16:57:03,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:03,715 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:03,930 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:03,931 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:03,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:03,931 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-22 16:57:03,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:03,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [867666938] [2020-08-22 16:57:03,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:03,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:04,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:04,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:04,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:04,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [867666938] [2020-08-22 16:57:04,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1457016602] [2020-08-22 16:57:04,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-08-22 16:57:04,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:57:04,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:04,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:57:04,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:04,093 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:04,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:04,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 7 [2020-08-22 16:57:04,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584769271] [2020-08-22 16:57:04,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:57:04,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:04,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:57:04,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:57:04,096 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-22 16:57:04,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:04,265 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-22 16:57:04,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 16:57:04,265 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-22 16:57:04,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:04,267 INFO L225 Difference]: With dead ends: 59 [2020-08-22 16:57:04,267 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 16:57:04,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-22 16:57:04,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 16:57:04,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-22 16:57:04,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 16:57:04,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 16:57:04,277 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-22 16:57:04,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:04,278 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 16:57:04,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:57:04,278 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 16:57:04,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 16:57:04,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:04,279 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:04,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:04,495 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:04,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:04,496 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-22 16:57:04,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:04,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369331128] [2020-08-22 16:57:04,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:04,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:04,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:04,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:04,978 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:04,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369331128] [2020-08-22 16:57:04,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477182368] [2020-08-22 16:57:04,979 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2020-08-22 16:57:05,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-08-22 16:57:05,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:05,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 27 conjunts are in the unsatisfiable core [2020-08-22 16:57:05,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:05,032 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-08-22 16:57:05,035 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:05,038 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:05,038 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:05,039 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-08-22 16:57:05,232 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-08-22 16:57:05,233 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:05,241 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:05,242 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:05,243 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-08-22 16:57:05,348 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:05,348 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-08-22 16:57:05,349 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-08-22 16:57:05,378 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-08-22 16:57:05,380 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:05,381 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:40, output treesize:3 [2020-08-22 16:57:05,438 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:05,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:05,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2020-08-22 16:57:05,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [38579036] [2020-08-22 16:57:05,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 16:57:05,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:05,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 16:57:05,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=581, Unknown=0, NotChecked=0, Total=650 [2020-08-22 16:57:05,441 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 26 states. [2020-08-22 16:57:06,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:06,613 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-22 16:57:06,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 16:57:06,614 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 25 [2020-08-22 16:57:06,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:06,618 INFO L225 Difference]: With dead ends: 70 [2020-08-22 16:57:06,618 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 16:57:06,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=270, Invalid=1452, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 16:57:06,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 16:57:06,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-22 16:57:06,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 16:57:06,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-22 16:57:06,639 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-22 16:57:06,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:06,640 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-22 16:57:06,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 16:57:06,640 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-22 16:57:06,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 16:57:06,641 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:06,642 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:06,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:06,852 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:06,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:06,853 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-22 16:57:06,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:06,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476414923] [2020-08-22 16:57:06,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:06,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:06,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:06,941 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:06,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476414923] [2020-08-22 16:57:06,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868256636] [2020-08-22 16:57:06,942 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 [2020-08-22 16:57:06,992 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:57:06,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:06,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 29 conjunts are in the unsatisfiable core [2020-08-22 16:57:07,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:07,009 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-08-22 16:57:07,010 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:07,014 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:07,014 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:07,015 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-08-22 16:57:07,104 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-08-22 16:57:07,105 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:07,117 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:07,118 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:07,118 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-08-22 16:57:07,274 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:07,275 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-08-22 16:57:07,276 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-08-22 16:57:07,288 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-08-22 16:57:07,291 INFO L545 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:07,292 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2020-08-22 16:57:07,346 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 16:57:07,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:07,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 19 [2020-08-22 16:57:07,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22128176] [2020-08-22 16:57:07,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 16:57:07,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:07,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 16:57:07,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-22 16:57:07,349 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 19 states. [2020-08-22 16:57:08,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:08,646 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2020-08-22 16:57:08,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 16:57:08,647 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 27 [2020-08-22 16:57:08,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:08,648 INFO L225 Difference]: With dead ends: 96 [2020-08-22 16:57:08,649 INFO L226 Difference]: Without dead ends: 82 [2020-08-22 16:57:08,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=286, Invalid=1520, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 16:57:08,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-22 16:57:08,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 64. [2020-08-22 16:57:08,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 16:57:08,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2020-08-22 16:57:08,684 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 27 [2020-08-22 16:57:08,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:08,684 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2020-08-22 16:57:08,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 16:57:08,685 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2020-08-22 16:57:08,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 16:57:08,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:08,686 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-08-22 16:57:08,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:08,903 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:08,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:08,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-22 16:57:08,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:08,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077575161] [2020-08-22 16:57:08,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:08,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:08,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 16:57:08,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:08,997 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 16:57:08,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077575161] [2020-08-22 16:57:08,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60700812] [2020-08-22 16:57:08,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -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 [2020-08-22 16:57:09,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:09,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2020-08-22 16:57:09,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:09,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 16:57:09,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:09,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2020-08-22 16:57:09,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508764494] [2020-08-22 16:57:09,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 16:57:09,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:09,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 16:57:09,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:57:09,108 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand 11 states. [2020-08-22 16:57:09,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:09,304 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2020-08-22 16:57:09,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 16:57:09,305 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-22 16:57:09,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:09,306 INFO L225 Difference]: With dead ends: 99 [2020-08-22 16:57:09,306 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 16:57:09,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:57:09,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 16:57:09,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2020-08-22 16:57:09,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 16:57:09,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-08-22 16:57:09,318 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 29 [2020-08-22 16:57:09,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:09,319 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-08-22 16:57:09,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 16:57:09,319 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-08-22 16:57:09,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 16:57:09,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:09,320 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:09,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:09,527 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:09,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:09,528 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-22 16:57:09,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:09,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089901640] [2020-08-22 16:57:09,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:09,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:09,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:09,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:09,941 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:09,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089901640] [2020-08-22 16:57:09,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341943910] [2020-08-22 16:57:09,942 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2020-08-22 16:57:09,989 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-08-22 16:57:09,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:09,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 34 conjunts are in the unsatisfiable core [2020-08-22 16:57:09,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:10,006 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-08-22 16:57:10,007 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,010 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,011 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,011 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-08-22 16:57:10,053 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-08-22 16:57:10,054 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,059 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,060 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,060 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:8 [2020-08-22 16:57:10,088 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-08-22 16:57:10,089 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,094 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,097 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,097 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:8 [2020-08-22 16:57:10,128 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-08-22 16:57:10,129 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,142 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,143 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,144 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:11 [2020-08-22 16:57:10,238 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-08-22 16:57:10,238 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,246 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,247 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,248 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-08-22 16:57:10,322 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-08-22 16:57:10,322 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 42 [2020-08-22 16:57:10,323 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,347 INFO L625 ElimStorePlain]: treesize reduction 22, result has 64.5 percent of original size [2020-08-22 16:57:10,348 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,349 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:44, output treesize:40 [2020-08-22 16:57:10,423 INFO L350 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2020-08-22 16:57:10,424 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 51 [2020-08-22 16:57:10,425 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,449 INFO L625 ElimStorePlain]: treesize reduction 17, result has 74.6 percent of original size [2020-08-22 16:57:10,450 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,451 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:52, output treesize:50 [2020-08-22 16:57:10,542 INFO L350 Elim1Store]: treesize reduction 56, result has 33.3 percent of original size [2020-08-22 16:57:10,543 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 63 [2020-08-22 16:57:10,545 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,574 INFO L625 ElimStorePlain]: treesize reduction 15, result has 80.0 percent of original size [2020-08-22 16:57:10,575 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,575 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:64, output treesize:60 [2020-08-22 16:57:10,758 INFO L350 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2020-08-22 16:57:10,758 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 65 treesize of output 63 [2020-08-22 16:57:10,760 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,780 INFO L625 ElimStorePlain]: treesize reduction 41, result has 25.5 percent of original size [2020-08-22 16:57:10,783 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-08-22 16:57:10,784 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:75, output treesize:3 [2020-08-22 16:57:10,842 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:10,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:10,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 30 [2020-08-22 16:57:10,843 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701467862] [2020-08-22 16:57:10,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 16:57:10,844 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:10,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 16:57:10,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=791, Unknown=0, NotChecked=0, Total=870 [2020-08-22 16:57:10,845 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 30 states. [2020-08-22 16:57:13,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:13,250 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2020-08-22 16:57:13,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 16:57:13,251 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2020-08-22 16:57:13,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:13,253 INFO L225 Difference]: With dead ends: 110 [2020-08-22 16:57:13,253 INFO L226 Difference]: Without dead ends: 108 [2020-08-22 16:57:13,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=396, Invalid=2796, Unknown=0, NotChecked=0, Total=3192 [2020-08-22 16:57:13,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-22 16:57:13,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 68. [2020-08-22 16:57:13,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-22 16:57:13,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2020-08-22 16:57:13,270 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 29 [2020-08-22 16:57:13,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:13,270 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2020-08-22 16:57:13,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 16:57:13,271 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2020-08-22 16:57:13,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 16:57:13,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:13,276 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:13,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:13,477 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:13,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:13,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-22 16:57:13,477 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:13,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755052935] [2020-08-22 16:57:13,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:13,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:13,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:13,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:13,553 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:13,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755052935] [2020-08-22 16:57:13,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370863792] [2020-08-22 16:57:13,554 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2020-08-22 16:57:13,623 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2020-08-22 16:57:13,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:13,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2020-08-22 16:57:13,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:13,656 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:13,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:13,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 9 [2020-08-22 16:57:13,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438701122] [2020-08-22 16:57:13,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 16:57:13,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:13,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 16:57:13,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 16:57:13,661 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand 9 states. [2020-08-22 16:57:13,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:13,912 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2020-08-22 16:57:13,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 16:57:13,913 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-22 16:57:13,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:13,914 INFO L225 Difference]: With dead ends: 104 [2020-08-22 16:57:13,914 INFO L226 Difference]: Without dead ends: 93 [2020-08-22 16:57:13,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-22 16:57:13,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-22 16:57:13,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 70. [2020-08-22 16:57:13,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 16:57:13,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2020-08-22 16:57:13,931 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 31 [2020-08-22 16:57:13,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:13,931 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2020-08-22 16:57:13,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 16:57:13,931 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2020-08-22 16:57:13,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 16:57:13,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:13,933 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] [2020-08-22 16:57:14,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-08-22 16:57:14,149 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:14,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:14,149 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-22 16:57:14,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:14,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909922606] [2020-08-22 16:57:14,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:14,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:14,172 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:14,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:14,221 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:14,252 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:57:14,252 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:57:14,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 16:57:14,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:57:14 BoogieIcfgContainer [2020-08-22 16:57:14,294 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:57:14,296 INFO L168 Benchmark]: Toolchain (without parser) took 14225.04 ms. Allocated memory was 148.4 MB in the beginning and 320.9 MB in the end (delta: 172.5 MB). Free memory was 104.2 MB in the beginning and 124.5 MB in the end (delta: -20.3 MB). Peak memory consumption was 152.2 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,296 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 148.4 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,297 INFO L168 Benchmark]: CACSL2BoogieTranslator took 259.84 ms. Allocated memory is still 148.4 MB. Free memory was 104.0 MB in the beginning and 93.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,297 INFO L168 Benchmark]: Boogie Preprocessor took 147.44 ms. Allocated memory was 148.4 MB in the beginning and 206.0 MB in the end (delta: 57.7 MB). Free memory was 93.7 MB in the beginning and 183.3 MB in the end (delta: -89.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,298 INFO L168 Benchmark]: RCFGBuilder took 412.06 ms. Allocated memory is still 206.0 MB. Free memory was 183.3 MB in the beginning and 167.2 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,299 INFO L168 Benchmark]: TraceAbstraction took 13397.53 ms. Allocated memory was 206.0 MB in the beginning and 320.9 MB in the end (delta: 114.8 MB). Free memory was 166.6 MB in the beginning and 124.5 MB in the end (delta: 42.1 MB). Peak memory consumption was 157.0 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:14,301 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 148.4 MB. Free memory was 123.0 MB in the beginning and 122.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 259.84 ms. Allocated memory is still 148.4 MB. Free memory was 104.0 MB in the beginning and 93.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 147.44 ms. Allocated memory was 148.4 MB in the beginning and 206.0 MB in the end (delta: 57.7 MB). Free memory was 93.7 MB in the beginning and 183.3 MB in the end (delta: -89.7 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 412.06 ms. Allocated memory is still 206.0 MB. Free memory was 183.3 MB in the beginning and 167.2 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13397.53 ms. Allocated memory was 206.0 MB in the beginning and 320.9 MB in the end (delta: 114.8 MB). Free memory was 166.6 MB in the beginning and 124.5 MB in the end (delta: 42.1 MB). Peak memory consumption was 157.0 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(); [L15] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 VAL [cont=0, i=0, MAX=2, str1={3:0}, str2={4:0}] [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={3:0}, str2={4:0}] [L27] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={4:0}] [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={3:0}, str2={4:0}] [L27] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={4:0}] [L27] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={4:0}] [L32] j = MAX-1 [L33] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={4:0}] [L33] COND TRUE i