/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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-multidimensional/min-2-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:30:34,791 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:30:34,795 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:30:34,808 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:30:34,808 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:30:34,809 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:30:34,810 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:30:34,812 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:30:34,814 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:30:34,815 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:30:34,816 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:30:34,817 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:30:34,818 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:30:34,819 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:30:34,820 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:30:34,821 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:30:34,821 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:30:34,822 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:30:34,824 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:30:34,826 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:30:34,828 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:30:34,830 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:30:34,831 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:30:34,834 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:30:34,836 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:30:34,851 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:30:34,854 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:30:34,855 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:30:34,855 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 [2019-11-07 01:30:34,879 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:30:34,879 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:30:34,881 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:30:34,882 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:30:34,882 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:30:34,882 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:30:34,882 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:30:34,882 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:30:34,883 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:30:34,883 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:30:34,884 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:30:34,884 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:30:34,884 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:30:34,885 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:30:34,885 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:30:34,885 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:30:34,885 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:30:34,886 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:30:34,886 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:30:34,886 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:30:34,886 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:30:34,886 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:30:34,887 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:30:34,887 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:30:34,887 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:30:34,887 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:30:34,887 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:30:34,888 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:30:34,888 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:30:35,174 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:30:35,190 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:30:35,194 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:30:35,195 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:30:35,196 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:30:35,197 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/min-2-u.c [2019-11-07 01:30:35,271 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8c835af7/03b8b56ba6944be597572dc7463889af/FLAGac3c9ed58 [2019-11-07 01:30:35,794 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:30:35,795 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/min-2-u.c [2019-11-07 01:30:35,801 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8c835af7/03b8b56ba6944be597572dc7463889af/FLAGac3c9ed58 [2019-11-07 01:30:36,149 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b8c835af7/03b8b56ba6944be597572dc7463889af [2019-11-07 01:30:36,179 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:30:36,188 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:30:36,190 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:30:36,191 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:30:36,202 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:30:36,205 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,216 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ae0e69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36, skipping insertion in model container [2019-11-07 01:30:36,216 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,234 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:30:36,267 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:30:36,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:30:36,467 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:30:36,497 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:30:36,531 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:30:36,532 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36 WrapperNode [2019-11-07 01:30:36,532 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:30:36,533 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:30:36,533 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:30:36,533 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:30:36,547 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,547 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,622 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,622 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,629 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,636 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,637 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (1/1) ... [2019-11-07 01:30:36,640 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:30:36,641 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:30:36,641 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:30:36,641 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:30:36,642 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (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 [2019-11-07 01:30:36,698 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:30:36,699 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:30:36,699 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:30:36,699 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:30:36,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:30:36,699 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:30:36,700 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:30:36,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:30:36,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:30:37,115 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:30:37,115 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-11-07 01:30:37,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:30:37 BoogieIcfgContainer [2019-11-07 01:30:37,117 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:30:37,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:30:37,119 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:30:37,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:30:37,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:30:36" (1/3) ... [2019-11-07 01:30:37,123 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7adecbbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:30:37, skipping insertion in model container [2019-11-07 01:30:37,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:30:36" (2/3) ... [2019-11-07 01:30:37,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7adecbbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:30:37, skipping insertion in model container [2019-11-07 01:30:37,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:30:37" (3/3) ... [2019-11-07 01:30:37,126 INFO L109 eAbstractionObserver]: Analyzing ICFG min-2-u.c [2019-11-07 01:30:37,134 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:30:37,143 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:30:37,157 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:30:37,181 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:30:37,181 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:30:37,181 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:30:37,182 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:30:37,182 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:30:37,182 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:30:37,182 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:30:37,182 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:30:37,200 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:30:37,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:30:37,207 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:37,208 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:37,210 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:37,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:37,215 INFO L82 PathProgramCache]: Analyzing trace with hash -1121179117, now seen corresponding path program 1 times [2019-11-07 01:30:37,225 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:37,226 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318501540] [2019-11-07 01:30:37,226 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:37,314 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:37,315 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1491171216] [2019-11-07 01:30:37,315 INFO L94 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 [2019-11-07 01:30:37,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:37,373 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:30:37,380 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:37,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:37,443 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:37,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:30:37,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318501540] [2019-11-07 01:30:37,476 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:37,477 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491171216] [2019-11-07 01:30:37,477 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:30:37,478 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2019-11-07 01:30:37,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526242237] [2019-11-07 01:30:37,484 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-07 01:30:37,485 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:37,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-07 01:30:37,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:30:37,505 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2019-11-07 01:30:37,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:37,589 INFO L93 Difference]: Finished difference Result 40 states and 54 transitions. [2019-11-07 01:30:37,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-07 01:30:37,592 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2019-11-07 01:30:37,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:37,608 INFO L225 Difference]: With dead ends: 40 [2019-11-07 01:30:37,609 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 01:30:37,615 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-07 01:30:37,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 01:30:37,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 01:30:37,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:30:37,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-11-07 01:30:37,661 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 13 [2019-11-07 01:30:37,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:37,661 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-11-07 01:30:37,661 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-07 01:30:37,662 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-11-07 01:30:37,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-07 01:30:37,663 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:37,663 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:37,868 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:37,869 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:37,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:37,870 INFO L82 PathProgramCache]: Analyzing trace with hash 343234267, now seen corresponding path program 1 times [2019-11-07 01:30:37,870 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:37,871 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534527977] [2019-11-07 01:30:37,871 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:37,887 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:37,888 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2117541196] [2019-11-07 01:30:37,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -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 [2019-11-07 01:30:37,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:37,936 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:30:37,938 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:37,966 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:30:37,967 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:37,989 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:30:37,990 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534527977] [2019-11-07 01:30:37,990 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:37,991 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117541196] [2019-11-07 01:30:37,991 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:30:37,991 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2019-11-07 01:30:37,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684092833] [2019-11-07 01:30:37,994 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:30:37,994 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:37,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:30:37,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:30:37,995 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 6 states. [2019-11-07 01:30:38,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:38,131 INFO L93 Difference]: Finished difference Result 49 states and 70 transitions. [2019-11-07 01:30:38,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-07 01:30:38,132 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-07 01:30:38,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:38,136 INFO L225 Difference]: With dead ends: 49 [2019-11-07 01:30:38,137 INFO L226 Difference]: Without dead ends: 34 [2019-11-07 01:30:38,139 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2019-11-07 01:30:38,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-07 01:30:38,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-11-07 01:30:38,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-07 01:30:38,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-11-07 01:30:38,168 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 17 [2019-11-07 01:30:38,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:38,173 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-11-07 01:30:38,173 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-07 01:30:38,173 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-11-07 01:30:38,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-07 01:30:38,175 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:38,175 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:38,380 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:38,380 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:38,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:38,382 INFO L82 PathProgramCache]: Analyzing trace with hash -1084120933, now seen corresponding path program 1 times [2019-11-07 01:30:38,382 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:38,383 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807396321] [2019-11-07 01:30:38,383 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:38,392 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:38,393 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [984537313] [2019-11-07 01:30:38,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -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 [2019-11-07 01:30:38,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:38,455 INFO L256 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:30:38,458 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:38,521 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:30:38,523 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:38,580 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-07 01:30:38,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807396321] [2019-11-07 01:30:38,581 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:38,581 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984537313] [2019-11-07 01:30:38,582 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [919404298] [2019-11-07 01:30:38,618 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:30:38,619 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:38,626 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:38,634 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:38,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:38,770 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:39,272 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:39,275 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:39,565 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-07 01:30:39,565 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 6] total 18 [2019-11-07 01:30:39,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674031970] [2019-11-07 01:30:39,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-07 01:30:39,567 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:39,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-07 01:30:39,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:30:39,568 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 10 states. [2019-11-07 01:30:39,751 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 46 [2019-11-07 01:30:39,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:39,969 INFO L93 Difference]: Finished difference Result 50 states and 60 transitions. [2019-11-07 01:30:39,969 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-07 01:30:39,970 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2019-11-07 01:30:39,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:39,971 INFO L225 Difference]: With dead ends: 50 [2019-11-07 01:30:39,972 INFO L226 Difference]: Without dead ends: 35 [2019-11-07 01:30:39,973 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2019-11-07 01:30:39,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-07 01:30:39,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2019-11-07 01:30:39,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 01:30:39,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2019-11-07 01:30:39,983 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 21 [2019-11-07 01:30:39,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:39,983 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2019-11-07 01:30:39,983 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-07 01:30:39,984 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2019-11-07 01:30:39,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-07 01:30:39,985 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:39,985 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:40,188 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:40,189 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:40,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:40,190 INFO L82 PathProgramCache]: Analyzing trace with hash 207754054, now seen corresponding path program 1 times [2019-11-07 01:30:40,191 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:40,191 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880736382] [2019-11-07 01:30:40,191 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:40,200 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:40,200 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [688477070] [2019-11-07 01:30:40,200 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -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 [2019-11-07 01:30:40,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:40,244 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-07 01:30:40,246 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:40,284 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:30:40,285 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:40,331 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-07 01:30:40,331 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880736382] [2019-11-07 01:30:40,332 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:40,332 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [688477070] [2019-11-07 01:30:40,332 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575670111] [2019-11-07 01:30:40,335 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:40,336 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:40,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:40,337 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:40,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:40,372 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:40,754 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:30:40,765 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:40,768 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:41,025 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 45 [2019-11-07 01:30:41,295 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:41,295 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 14] total 24 [2019-11-07 01:30:41,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360671677] [2019-11-07 01:30:41,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-07 01:30:41,297 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:41,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-07 01:30:41,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2019-11-07 01:30:41,298 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand 24 states. [2019-11-07 01:30:42,021 WARN L191 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 55 [2019-11-07 01:30:42,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:42,781 INFO L93 Difference]: Finished difference Result 86 states and 120 transitions. [2019-11-07 01:30:42,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-07 01:30:42,782 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 25 [2019-11-07 01:30:42,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:42,785 INFO L225 Difference]: With dead ends: 86 [2019-11-07 01:30:42,785 INFO L226 Difference]: Without dead ends: 62 [2019-11-07 01:30:42,786 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=316, Invalid=1244, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 01:30:42,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-07 01:30:42,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 57. [2019-11-07 01:30:42,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-07 01:30:42,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2019-11-07 01:30:42,804 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 25 [2019-11-07 01:30:42,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:42,804 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2019-11-07 01:30:42,804 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-07 01:30:42,804 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2019-11-07 01:30:42,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-07 01:30:42,806 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:42,806 INFO L410 BasicCegarLoop]: trace histogram [12, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:43,012 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:43,013 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:43,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:43,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1166771462, now seen corresponding path program 2 times [2019-11-07 01:30:43,014 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:43,014 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32915029] [2019-11-07 01:30:43,014 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:43,032 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:43,032 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [207302397] [2019-11-07 01:30:43,032 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-07 01:30:43,094 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:30:43,095 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:30:43,095 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:30:43,097 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:43,118 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-11-07 01:30:43,119 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2019-11-07 01:30:43,171 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32915029] [2019-11-07 01:30:43,171 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:43,172 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207302397] [2019-11-07 01:30:43,172 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108506798] [2019-11-07 01:30:43,179 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:43,179 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:43,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:43,180 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:43,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:43,219 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:43,573 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:30:43,577 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:43,580 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:44,058 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:44,059 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 14] total 22 [2019-11-07 01:30:44,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960486316] [2019-11-07 01:30:44,060 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-07 01:30:44,060 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:44,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-07 01:30:44,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=392, Unknown=0, NotChecked=0, Total=462 [2019-11-07 01:30:44,061 INFO L87 Difference]: Start difference. First operand 57 states and 68 transitions. Second operand 22 states. [2019-11-07 01:30:44,460 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2019-11-07 01:30:44,697 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 56 [2019-11-07 01:30:45,037 WARN L191 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2019-11-07 01:30:45,391 WARN L191 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 55 [2019-11-07 01:30:46,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:46,041 INFO L93 Difference]: Finished difference Result 191 states and 240 transitions. [2019-11-07 01:30:46,041 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:30:46,041 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 37 [2019-11-07 01:30:46,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:46,043 INFO L225 Difference]: With dead ends: 191 [2019-11-07 01:30:46,043 INFO L226 Difference]: Without dead ends: 165 [2019-11-07 01:30:46,045 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 342 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=297, Invalid=1185, Unknown=0, NotChecked=0, Total=1482 [2019-11-07 01:30:46,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-11-07 01:30:46,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 81. [2019-11-07 01:30:46,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-11-07 01:30:46,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 95 transitions. [2019-11-07 01:30:46,071 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 95 transitions. Word has length 37 [2019-11-07 01:30:46,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:46,072 INFO L462 AbstractCegarLoop]: Abstraction has 81 states and 95 transitions. [2019-11-07 01:30:46,072 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-07 01:30:46,072 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 95 transitions. [2019-11-07 01:30:46,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-07 01:30:46,074 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:46,074 INFO L410 BasicCegarLoop]: trace histogram [24, 12, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:46,277 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:46,278 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:46,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:46,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1713703481, now seen corresponding path program 3 times [2019-11-07 01:30:46,279 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:46,279 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043473351] [2019-11-07 01:30:46,279 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:46,290 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:46,290 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1617658437] [2019-11-07 01:30:46,290 INFO L92 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 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 [2019-11-07 01:30:46,368 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:30:46,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:30:46,369 INFO L256 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-07 01:30:46,373 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:46,505 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 15 proven. 310 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2019-11-07 01:30:46,505 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:46,657 INFO L134 CoverageAnalysis]: Checked inductivity of 482 backedges. 15 proven. 310 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2019-11-07 01:30:46,657 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043473351] [2019-11-07 01:30:46,657 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:46,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617658437] [2019-11-07 01:30:46,658 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [783244758] [2019-11-07 01:30:46,659 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:46,660 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:46,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:46,661 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:46,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:46,687 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:46,941 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:30:46,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:46,946 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:47,484 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:47,484 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 40 [2019-11-07 01:30:47,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917226920] [2019-11-07 01:30:47,486 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-11-07 01:30:47,486 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:47,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-11-07 01:30:47,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=1333, Unknown=0, NotChecked=0, Total=1560 [2019-11-07 01:30:47,487 INFO L87 Difference]: Start difference. First operand 81 states and 95 transitions. Second operand 40 states. [2019-11-07 01:30:51,141 WARN L191 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 56 [2019-11-07 01:30:51,644 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 56 [2019-11-07 01:30:53,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:53,208 INFO L93 Difference]: Finished difference Result 391 states and 496 transitions. [2019-11-07 01:30:53,208 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2019-11-07 01:30:53,208 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 61 [2019-11-07 01:30:53,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:53,214 INFO L225 Difference]: With dead ends: 391 [2019-11-07 01:30:53,214 INFO L226 Difference]: Without dead ends: 365 [2019-11-07 01:30:53,235 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3148 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1724, Invalid=7978, Unknown=0, NotChecked=0, Total=9702 [2019-11-07 01:30:53,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2019-11-07 01:30:53,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 106. [2019-11-07 01:30:53,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-11-07 01:30:53,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 124 transitions. [2019-11-07 01:30:53,309 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 124 transitions. Word has length 61 [2019-11-07 01:30:53,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:53,310 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 124 transitions. [2019-11-07 01:30:53,310 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-11-07 01:30:53,310 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 124 transitions. [2019-11-07 01:30:53,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-11-07 01:30:53,312 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:53,312 INFO L410 BasicCegarLoop]: trace histogram [36, 12, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:53,516 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:53,516 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:53,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:53,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1482595171, now seen corresponding path program 4 times [2019-11-07 01:30:53,517 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:53,517 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904904679] [2019-11-07 01:30:53,517 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:53,527 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:53,527 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1016570254] [2019-11-07 01:30:53,527 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-07 01:30:53,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:30:53,637 INFO L256 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-07 01:30:53,640 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:30:53,736 INFO L134 CoverageAnalysis]: Checked inductivity of 976 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 904 trivial. 0 not checked. [2019-11-07 01:30:53,736 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:30:53,819 INFO L134 CoverageAnalysis]: Checked inductivity of 976 backedges. 51 proven. 21 refuted. 0 times theorem prover too weak. 904 trivial. 0 not checked. [2019-11-07 01:30:53,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904904679] [2019-11-07 01:30:53,819 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:30:53,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016570254] [2019-11-07 01:30:53,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451022532] [2019-11-07 01:30:53,822 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:30:53,823 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:30:53,823 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:30:53,823 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:30:53,824 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:30:53,845 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:30:54,084 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:30:54,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:30:54,095 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:30:54,592 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:30:54,592 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 14] total 32 [2019-11-07 01:30:54,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755240078] [2019-11-07 01:30:54,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-07 01:30:54,594 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:30:54,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-07 01:30:54,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:30:54,596 INFO L87 Difference]: Start difference. First operand 106 states and 124 transitions. Second operand 32 states. [2019-11-07 01:30:54,778 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 43 [2019-11-07 01:30:55,849 WARN L191 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 55 [2019-11-07 01:30:56,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:30:56,894 INFO L93 Difference]: Finished difference Result 298 states and 421 transitions. [2019-11-07 01:30:56,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-07 01:30:56,895 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 77 [2019-11-07 01:30:56,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:30:56,896 INFO L225 Difference]: With dead ends: 298 [2019-11-07 01:30:56,897 INFO L226 Difference]: Without dead ends: 205 [2019-11-07 01:30:56,900 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=704, Invalid=2376, Unknown=0, NotChecked=0, Total=3080 [2019-11-07 01:30:56,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2019-11-07 01:30:56,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 201. [2019-11-07 01:30:56,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2019-11-07 01:30:56,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 226 transitions. [2019-11-07 01:30:56,991 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 226 transitions. Word has length 77 [2019-11-07 01:30:56,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:30:56,994 INFO L462 AbstractCegarLoop]: Abstraction has 201 states and 226 transitions. [2019-11-07 01:30:56,994 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-07 01:30:56,994 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 226 transitions. [2019-11-07 01:30:57,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2019-11-07 01:30:57,006 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:30:57,006 INFO L410 BasicCegarLoop]: trace histogram [98, 28, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:30:57,210 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:30:57,211 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:30:57,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:30:57,211 INFO L82 PathProgramCache]: Analyzing trace with hash 2101373704, now seen corresponding path program 5 times [2019-11-07 01:30:57,211 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:30:57,212 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573708346] [2019-11-07 01:30:57,213 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:30:57,224 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:30:57,225 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1302990308] [2019-11-07 01:30:57,225 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:31:03,708 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2019-11-07 01:31:03,709 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:31:03,716 INFO L256 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-07 01:31:03,721 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:31:03,920 INFO L134 CoverageAnalysis]: Checked inductivity of 5926 backedges. 227 proven. 105 refuted. 0 times theorem prover too weak. 5594 trivial. 0 not checked. [2019-11-07 01:31:03,921 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:31:04,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5926 backedges. 2 proven. 330 refuted. 0 times theorem prover too weak. 5594 trivial. 0 not checked. [2019-11-07 01:31:04,181 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573708346] [2019-11-07 01:31:04,181 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:31:04,181 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302990308] [2019-11-07 01:31:04,181 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [715596213] [2019-11-07 01:31:04,183 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:31:04,183 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:31:04,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:31:04,183 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:31:04,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:31:04,197 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:31:04,399 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:31:04,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:31:04,405 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:31:04,829 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:31:04,829 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 14] total 48 [2019-11-07 01:31:04,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26508283] [2019-11-07 01:31:04,831 INFO L442 AbstractCegarLoop]: Interpolant automaton has 48 states [2019-11-07 01:31:04,831 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:31:04,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2019-11-07 01:31:04,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=577, Invalid=1679, Unknown=0, NotChecked=0, Total=2256 [2019-11-07 01:31:04,832 INFO L87 Difference]: Start difference. First operand 201 states and 226 transitions. Second operand 48 states. [2019-11-07 01:31:07,316 WARN L191 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 55 [2019-11-07 01:31:09,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:31:09,250 INFO L93 Difference]: Finished difference Result 577 states and 803 transitions. [2019-11-07 01:31:09,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2019-11-07 01:31:09,251 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 157 [2019-11-07 01:31:09,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:31:09,255 INFO L225 Difference]: With dead ends: 577 [2019-11-07 01:31:09,255 INFO L226 Difference]: Without dead ends: 397 [2019-11-07 01:31:09,259 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 510 GetRequests, 424 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2280 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2056, Invalid=5600, Unknown=0, NotChecked=0, Total=7656 [2019-11-07 01:31:09,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2019-11-07 01:31:09,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 393. [2019-11-07 01:31:09,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 393 states. [2019-11-07 01:31:09,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 434 transitions. [2019-11-07 01:31:09,303 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 434 transitions. Word has length 157 [2019-11-07 01:31:09,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:31:09,304 INFO L462 AbstractCegarLoop]: Abstraction has 393 states and 434 transitions. [2019-11-07 01:31:09,304 INFO L463 AbstractCegarLoop]: Interpolant automaton has 48 states. [2019-11-07 01:31:09,304 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 434 transitions. [2019-11-07 01:31:09,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2019-11-07 01:31:09,308 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:31:09,308 INFO L410 BasicCegarLoop]: trace histogram [210, 60, 7, 7, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:31:09,516 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:31:09,517 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:31:09,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:31:09,519 INFO L82 PathProgramCache]: Analyzing trace with hash -1260267000, now seen corresponding path program 6 times [2019-11-07 01:31:09,519 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:31:09,520 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923341818] [2019-11-07 01:31:09,520 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:31:09,567 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-07 01:31:09,568 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [628630408] [2019-11-07 01:31:09,571 INFO L92 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:31:09,912 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:31:09,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:31:09,917 INFO L256 TraceCheckSpWp]: Trace formula consists of 947 conjuncts, 40 conjunts are in the unsatisfiable core [2019-11-07 01:31:09,925 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:31:10,882 INFO L134 CoverageAnalysis]: Checked inductivity of 25358 backedges. 435 proven. 20239 refuted. 0 times theorem prover too weak. 4684 trivial. 0 not checked. [2019-11-07 01:31:10,882 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:31:11,818 INFO L134 CoverageAnalysis]: Checked inductivity of 25358 backedges. 435 proven. 20239 refuted. 0 times theorem prover too weak. 4684 trivial. 0 not checked. [2019-11-07 01:31:11,818 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923341818] [2019-11-07 01:31:11,818 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-07 01:31:11,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628630408] [2019-11-07 01:31:11,819 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1211999746] [2019-11-07 01:31:11,820 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-11-07 01:31:11,820 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:31:11,821 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:31:11,821 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:31:11,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:31:11,834 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:31:12,010 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:31:12,013 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:31:12,014 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:31:13,102 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2019-11-07 01:31:13,102 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 14] total 94 [2019-11-07 01:31:13,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2237976] [2019-11-07 01:31:13,104 INFO L442 AbstractCegarLoop]: Interpolant automaton has 94 states [2019-11-07 01:31:13,104 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:31:13,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2019-11-07 01:31:13,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2243, Invalid=6499, Unknown=0, NotChecked=0, Total=8742 [2019-11-07 01:31:13,107 INFO L87 Difference]: Start difference. First operand 393 states and 434 transitions. Second operand 94 states.