/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:10:36,387 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:10:36,390 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:10:36,409 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 05:10:36,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 05:10:36,424 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 05:10:36,427 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 05:10:36,427 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 05:10:36,428 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 05:10:36,429 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 05:10:36,430 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 05:10:36,431 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 05:10:36,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 05:10:36,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 05:10:36,433 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 05:10:36,434 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 05:10:36,436 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 05:10:36,440 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:10:36,441 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:10:36,441 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:10:36,442 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 [2021-05-06 05:10:36,459 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:10:36,460 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:10:36,461 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 05:10:36,461 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:10:36,461 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:10:36,462 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:10:36,462 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:10:36,463 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 05:10:36,463 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 05:10:36,464 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:10:36,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:10:36,687 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:10:36,689 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:10:36,689 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:10:36,690 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:10:36,691 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c [2021-05-06 05:10:36,739 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c8cdfe36/d25a28e7face4dfd8262e8eeb9a0ec2b/FLAGec6ce8396 [2021-05-06 05:10:37,160 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:10:37,161 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c [2021-05-06 05:10:37,165 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c8cdfe36/d25a28e7face4dfd8262e8eeb9a0ec2b/FLAGec6ce8396 [2021-05-06 05:10:37,180 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5c8cdfe36/d25a28e7face4dfd8262e8eeb9a0ec2b [2021-05-06 05:10:37,184 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:10:37,185 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 05:10:37,187 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:10:37,187 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:10:37,190 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:10:37,190 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,191 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57eb12f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37, skipping insertion in model container [2021-05-06 05:10:37,191 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,196 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:10:37,210 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:10:37,289 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c[520,533] [2021-05-06 05:10:37,317 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:10:37,322 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:10:37,330 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_unwindbound2.c[520,533] [2021-05-06 05:10:37,334 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:10:37,343 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:10:37,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37 WrapperNode [2021-05-06 05:10:37,344 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:10:37,346 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:10:37,346 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:10:37,347 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:10:37,354 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,355 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,359 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,360 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,371 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,374 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,376 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (1/1) ... [2021-05-06 05:10:37,381 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:10:37,382 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:10:37,382 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:10:37,382 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:10:37,383 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (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 [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:10:37,542 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:10:37,543 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:10:37,543 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:10:37,543 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:10:37,543 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:10:37,544 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 05:10:37,544 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 05:10:37,544 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:10:37,544 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:10:37,545 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:10:37,764 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:10:37,765 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 05:10:37,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:10:37 BoogieIcfgContainer [2021-05-06 05:10:37,766 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:10:37,767 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:10:37,767 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:10:37,769 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:10:37,769 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:10:37" (1/3) ... [2021-05-06 05:10:37,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12fd9503 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:10:37, skipping insertion in model container [2021-05-06 05:10:37,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:10:37" (2/3) ... [2021-05-06 05:10:37,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12fd9503 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:10:37, skipping insertion in model container [2021-05-06 05:10:37,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:10:37" (3/3) ... [2021-05-06 05:10:37,771 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_unwindbound2.c [2021-05-06 05:10:37,774 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:10:37,777 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:10:37,787 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:10:37,806 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:10:37,806 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 05:10:37,806 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 05:10:37,807 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:10:37,807 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:10:37,807 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:10:37,807 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:10:37,807 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:10:37,817 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 05:10:37,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 05:10:37,820 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:37,820 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:37,820 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:37,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:37,824 INFO L82 PathProgramCache]: Analyzing trace with hash -643130361, now seen corresponding path program 1 times [2021-05-06 05:10:37,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:37,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [931408021] [2021-05-06 05:10:37,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:37,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:37,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:10:37,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:10:38,007 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:38,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [931408021] [2021-05-06 05:10:38,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [931408021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:10:38,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:10:38,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:10:38,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277254775] [2021-05-06 05:10:38,011 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:10:38,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:38,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:10:38,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:10:38,020 INFO L87 Difference]: Start difference. First operand has 26 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:38,119 INFO L93 Difference]: Finished difference Result 47 states and 70 transitions. [2021-05-06 05:10:38,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:10:38,121 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 05:10:38,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:38,126 INFO L225 Difference]: With dead ends: 47 [2021-05-06 05:10:38,126 INFO L226 Difference]: Without dead ends: 22 [2021-05-06 05:10:38,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:10:38,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-06 05:10:38,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-06 05:10:38,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:10:38,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-05-06 05:10:38,162 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 11 [2021-05-06 05:10:38,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:38,162 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-05-06 05:10:38,162 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,162 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-05-06 05:10:38,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 05:10:38,164 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:38,164 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:38,164 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:10:38,164 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:38,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:38,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1070997212, now seen corresponding path program 1 times [2021-05-06 05:10:38,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:38,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2082768354] [2021-05-06 05:10:38,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:38,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:10:38,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,299 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:10:38,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:38,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2082768354] [2021-05-06 05:10:38,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2082768354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:10:38,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:10:38,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 05:10:38,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684238218] [2021-05-06 05:10:38,302 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:10:38,302 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:38,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:10:38,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:10:38,307 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:38,395 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-05-06 05:10:38,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:38,396 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 05:10:38,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:38,396 INFO L225 Difference]: With dead ends: 32 [2021-05-06 05:10:38,396 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 05:10:38,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 72.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:38,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 05:10:38,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 05:10:38,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:10:38,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2021-05-06 05:10:38,402 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 12 [2021-05-06 05:10:38,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:38,402 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2021-05-06 05:10:38,403 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,403 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2021-05-06 05:10:38,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 05:10:38,403 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:38,403 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:38,403 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 05:10:38,403 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:38,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:38,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1072665508, now seen corresponding path program 1 times [2021-05-06 05:10:38,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:38,404 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037822169] [2021-05-06 05:10:38,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:38,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:10:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:10:38,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:38,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037822169] [2021-05-06 05:10:38,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037822169] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:10:38,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:10:38,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 05:10:38,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198387143] [2021-05-06 05:10:38,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:10:38,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:38,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:10:38,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:38,471 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:38,647 INFO L93 Difference]: Finished difference Result 36 states and 47 transitions. [2021-05-06 05:10:38,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:10:38,648 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 05:10:38,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:38,649 INFO L225 Difference]: With dead ends: 36 [2021-05-06 05:10:38,649 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 05:10:38,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 114.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:10:38,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 05:10:38,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-06 05:10:38,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 16 states have (on average 1.25) internal successors, (20), 18 states have internal predecessors, (20), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 05:10:38,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 05:10:38,655 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-06 05:10:38,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:38,656 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 05:10:38,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 05:10:38,656 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 05:10:38,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 05:10:38,656 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:38,656 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:38,657 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 05:10:38,657 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:38,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:38,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1640566567, now seen corresponding path program 1 times [2021-05-06 05:10:38,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:38,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725441767] [2021-05-06 05:10:38,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:38,665 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:38,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1074189684] [2021-05-06 05:10:38,665 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 [2021-05-06 05:10:38,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:38,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:10:38,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:38,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:38,789 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:10:38,789 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:38,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725441767] [2021-05-06 05:10:38,790 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:38,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074189684] [2021-05-06 05:10:38,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074189684] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:10:38,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:10:38,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:10:38,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854709129] [2021-05-06 05:10:38,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:10:38,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:38,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:10:38,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:10:38,791 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:10:38,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:38,819 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-06 05:10:38,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:10:38,819 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-06 05:10:38,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:38,820 INFO L225 Difference]: With dead ends: 40 [2021-05-06 05:10:38,820 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 05:10:38,820 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.1ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:38,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 05:10:38,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-06 05:10:38,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 21 states have internal predecessors, (23), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 05:10:38,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 47 transitions. [2021-05-06 05:10:38,825 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 47 transitions. Word has length 17 [2021-05-06 05:10:38,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:38,825 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 47 transitions. [2021-05-06 05:10:38,825 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:10:38,826 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 47 transitions. [2021-05-06 05:10:38,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 05:10:38,826 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:38,826 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:39,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:39,043 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:39,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:39,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1129080132, now seen corresponding path program 1 times [2021-05-06 05:10:39,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:39,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422097127] [2021-05-06 05:10:39,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:39,050 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:39,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1068598124] [2021-05-06 05:10:39,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -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 [2021-05-06 05:10:39,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:39,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:10:39,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:39,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,218 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:10:39,219 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:39,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422097127] [2021-05-06 05:10:39,219 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:39,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068598124] [2021-05-06 05:10:39,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068598124] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:10:39,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:10:39,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:10:39,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199714144] [2021-05-06 05:10:39,220 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:10:39,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:39,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:10:39,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:10:39,220 INFO L87 Difference]: Start difference. First operand 37 states and 47 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:10:39,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:39,251 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-06 05:10:39,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:10:39,251 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-06 05:10:39,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:39,252 INFO L225 Difference]: With dead ends: 44 [2021-05-06 05:10:39,252 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 05:10:39,253 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.2ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:39,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 05:10:39,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-06 05:10:39,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:10:39,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-05-06 05:10:39,262 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 22 [2021-05-06 05:10:39,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:39,263 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-05-06 05:10:39,263 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 05:10:39,263 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-05-06 05:10:39,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 05:10:39,264 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:39,264 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:39,484 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:39,485 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:39,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:39,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1326533350, now seen corresponding path program 1 times [2021-05-06 05:10:39,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:39,486 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197606370] [2021-05-06 05:10:39,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:39,492 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:39,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1167824718] [2021-05-06 05:10:39,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -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 [2021-05-06 05:10:39,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:39,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:10:39,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:39,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:39,607 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:10:39,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:39,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197606370] [2021-05-06 05:10:39,607 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:39,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167824718] [2021-05-06 05:10:39,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167824718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:39,607 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:39,607 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 05:10:39,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12185102] [2021-05-06 05:10:39,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:10:39,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:39,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:10:39,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:10:39,618 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:10:39,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:39,660 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2021-05-06 05:10:39,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:39,660 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 05:10:39,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:39,661 INFO L225 Difference]: With dead ends: 50 [2021-05-06 05:10:39,661 INFO L226 Difference]: Without dead ends: 41 [2021-05-06 05:10:39,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 12.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:39,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-06 05:10:39,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-05-06 05:10:39,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 11 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:10:39,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 47 transitions. [2021-05-06 05:10:39,675 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 47 transitions. Word has length 30 [2021-05-06 05:10:39,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:39,676 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 47 transitions. [2021-05-06 05:10:39,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:10:39,676 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 47 transitions. [2021-05-06 05:10:39,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 05:10:39,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:39,677 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:39,895 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:39,895 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:39,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:39,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1324865054, now seen corresponding path program 1 times [2021-05-06 05:10:39,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:39,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1433177395] [2021-05-06 05:10:39,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:39,902 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:39,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [575548202] [2021-05-06 05:10:39,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -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 [2021-05-06 05:10:39,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:39,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:10:39,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:40,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:40,043 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:10:40,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:40,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1433177395] [2021-05-06 05:10:40,043 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:40,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575548202] [2021-05-06 05:10:40,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575548202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:40,044 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:40,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:10:40,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391141127] [2021-05-06 05:10:40,044 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:10:40,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:40,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:10:40,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:40,045 INFO L87 Difference]: Start difference. First operand 41 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:10:40,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:40,128 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2021-05-06 05:10:40,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:40,129 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 05:10:40,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:40,129 INFO L225 Difference]: With dead ends: 54 [2021-05-06 05:10:40,130 INFO L226 Difference]: Without dead ends: 52 [2021-05-06 05:10:40,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.0ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:40,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-06 05:10:40,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2021-05-06 05:10:40,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 30 states have internal predecessors, (32), 15 states have call successors, (15), 7 states have call predecessors, (15), 6 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 05:10:40,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 60 transitions. [2021-05-06 05:10:40,135 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 60 transitions. Word has length 30 [2021-05-06 05:10:40,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:40,135 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 60 transitions. [2021-05-06 05:10:40,135 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 05:10:40,135 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 60 transitions. [2021-05-06 05:10:40,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-06 05:10:40,136 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:40,136 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:40,349 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:40,349 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:40,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:40,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1080733609, now seen corresponding path program 2 times [2021-05-06 05:10:40,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:40,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338255988] [2021-05-06 05:10:40,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:40,366 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:40,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [775612921] [2021-05-06 05:10:40,367 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 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 [2021-05-06 05:10:40,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:10:40,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:10:40,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:10:40,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:40,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:40,534 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-06 05:10:40,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:40,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338255988] [2021-05-06 05:10:40,534 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:40,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775612921] [2021-05-06 05:10:40,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775612921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:40,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:40,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:10:40,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622581894] [2021-05-06 05:10:40,535 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:10:40,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:40,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:10:40,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:40,536 INFO L87 Difference]: Start difference. First operand 50 states and 60 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 05:10:40,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:40,594 INFO L93 Difference]: Finished difference Result 58 states and 68 transitions. [2021-05-06 05:10:40,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:40,594 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 35 [2021-05-06 05:10:40,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:40,595 INFO L225 Difference]: With dead ends: 58 [2021-05-06 05:10:40,595 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 05:10:40,595 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.8ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:40,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 05:10:40,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-06 05:10:40,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 33 states have internal predecessors, (35), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 05:10:40,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 65 transitions. [2021-05-06 05:10:40,600 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 65 transitions. Word has length 35 [2021-05-06 05:10:40,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:40,600 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 65 transitions. [2021-05-06 05:10:40,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 05:10:40,600 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 65 transitions. [2021-05-06 05:10:40,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 05:10:40,601 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:40,601 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:40,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:40,817 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:40,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:40,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1183106562, now seen corresponding path program 3 times [2021-05-06 05:10:40,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:40,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717104300] [2021-05-06 05:10:40,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:40,822 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:40,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [89605993] [2021-05-06 05:10:40,823 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 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 [2021-05-06 05:10:40,881 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 05:10:40,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:10:40,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:10:40,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:40,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:40,995 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 05:10:40,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:40,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717104300] [2021-05-06 05:10:40,995 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:40,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89605993] [2021-05-06 05:10:40,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89605993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:40,995 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:40,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:10:40,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289966233] [2021-05-06 05:10:40,996 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:10:40,996 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:40,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:10:40,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:40,996 INFO L87 Difference]: Start difference. First operand 55 states and 65 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 05:10:41,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:41,064 INFO L93 Difference]: Finished difference Result 62 states and 71 transitions. [2021-05-06 05:10:41,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:41,064 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2021-05-06 05:10:41,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:41,065 INFO L225 Difference]: With dead ends: 62 [2021-05-06 05:10:41,065 INFO L226 Difference]: Without dead ends: 57 [2021-05-06 05:10:41,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.0ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:41,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-06 05:10:41,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2021-05-06 05:10:41,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.088235294117647) internal successors, (37), 35 states have internal predecessors, (37), 14 states have call successors, (14), 9 states have call predecessors, (14), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 05:10:41,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2021-05-06 05:10:41,071 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 40 [2021-05-06 05:10:41,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:41,072 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2021-05-06 05:10:41,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 05:10:41,072 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2021-05-06 05:10:41,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-05-06 05:10:41,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:41,076 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:41,288 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:41,289 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:41,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:41,289 INFO L82 PathProgramCache]: Analyzing trace with hash -1332643880, now seen corresponding path program 2 times [2021-05-06 05:10:41,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:41,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483291547] [2021-05-06 05:10:41,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:41,294 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:41,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1768681971] [2021-05-06 05:10:41,294 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 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 [2021-05-06 05:10:41,359 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:10:41,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:10:41,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:10:41,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:41,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:41,454 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 10 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-06 05:10:41,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:41,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483291547] [2021-05-06 05:10:41,454 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:41,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768681971] [2021-05-06 05:10:41,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768681971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:41,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:41,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:10:41,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773343946] [2021-05-06 05:10:41,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:10:41,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:41,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:10:41,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:41,456 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 05:10:41,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:41,527 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2021-05-06 05:10:41,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:10:41,527 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 48 [2021-05-06 05:10:41,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:41,529 INFO L225 Difference]: With dead ends: 72 [2021-05-06 05:10:41,529 INFO L226 Difference]: Without dead ends: 70 [2021-05-06 05:10:41,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.5ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:10:41,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-06 05:10:41,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2021-05-06 05:10:41,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 40 states have (on average 1.125) internal successors, (45), 42 states have internal predecessors, (45), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 05:10:41,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-06 05:10:41,544 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 48 [2021-05-06 05:10:41,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:41,546 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-06 05:10:41,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 05:10:41,546 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-06 05:10:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 05:10:41,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:41,547 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:41,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:10:41,753 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:41,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:41,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1748438349, now seen corresponding path program 1 times [2021-05-06 05:10:41,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:41,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1866666038] [2021-05-06 05:10:41,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:41,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:41,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1286594232] [2021-05-06 05:10:41,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -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 [2021-05-06 05:10:41,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:41,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-06 05:10:41,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:41,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:41,963 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-06 05:10:41,963 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:41,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1866666038] [2021-05-06 05:10:41,963 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:41,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286594232] [2021-05-06 05:10:41,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286594232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:41,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:41,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:10:41,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799964836] [2021-05-06 05:10:41,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:10:41,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:41,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:10:41,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:41,965 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 05:10:42,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:42,030 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2021-05-06 05:10:42,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:10:42,030 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-06 05:10:42,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:42,031 INFO L225 Difference]: With dead ends: 76 [2021-05-06 05:10:42,031 INFO L226 Difference]: Without dead ends: 74 [2021-05-06 05:10:42,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.6ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:10:42,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-06 05:10:42,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-06 05:10:42,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.1162790697674418) internal successors, (48), 45 states have internal predecessors, (48), 19 states have call successors, (19), 11 states have call predecessors, (19), 10 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-06 05:10:42,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 84 transitions. [2021-05-06 05:10:42,036 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 84 transitions. Word has length 53 [2021-05-06 05:10:42,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:42,036 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 84 transitions. [2021-05-06 05:10:42,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 05:10:42,036 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 84 transitions. [2021-05-06 05:10:42,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 05:10:42,037 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:42,037 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:42,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-06 05:10:42,245 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:42,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:42,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1073750136, now seen corresponding path program 1 times [2021-05-06 05:10:42,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:42,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [814653520] [2021-05-06 05:10:42,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:42,250 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:42,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1981278212] [2021-05-06 05:10:42,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -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 [2021-05-06 05:10:42,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:10:42,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 05:10:42,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:42,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,496 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 30 proven. 17 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-06 05:10:42,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:42,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [814653520] [2021-05-06 05:10:42,496 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:42,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981278212] [2021-05-06 05:10:42,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981278212] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:42,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:42,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 05:10:42,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414771100] [2021-05-06 05:10:42,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 05:10:42,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:42,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 05:10:42,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 05:10:42,497 INFO L87 Difference]: Start difference. First operand 73 states and 84 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 05:10:42,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:42,642 INFO L93 Difference]: Finished difference Result 80 states and 90 transitions. [2021-05-06 05:10:42,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 05:10:42,642 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-06 05:10:42,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:42,651 INFO L225 Difference]: With dead ends: 80 [2021-05-06 05:10:42,651 INFO L226 Difference]: Without dead ends: 75 [2021-05-06 05:10:42,651 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 62.8ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-06 05:10:42,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-06 05:10:42,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-05-06 05:10:42,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 46 states have (on average 1.065217391304348) internal successors, (49), 47 states have internal predecessors, (49), 17 states have call successors, (17), 12 states have call predecessors, (17), 11 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-06 05:10:42,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2021-05-06 05:10:42,656 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 58 [2021-05-06 05:10:42,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:42,656 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2021-05-06 05:10:42,656 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 8 states have internal predecessors, (20), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 05:10:42,656 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2021-05-06 05:10:42,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-06 05:10:42,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:10:42,657 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:10:42,870 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:42,871 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:10:42,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:10:42,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1908652266, now seen corresponding path program 3 times [2021-05-06 05:10:42,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:10:42,871 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933475561] [2021-05-06 05:10:42,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:10:42,876 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:10:42,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1929774060] [2021-05-06 05:10:42,876 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:42,934 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 05:10:42,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:10:42,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 05:10:42,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:10:42,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:42,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:43,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:43,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:10:43,058 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-06 05:10:43,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:10:43,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933475561] [2021-05-06 05:10:43,059 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:10:43,059 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929774060] [2021-05-06 05:10:43,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929774060] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:10:43,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:10:43,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:10:43,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939131925] [2021-05-06 05:10:43,059 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:10:43,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:10:43,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:10:43,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:10:43,060 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 05:10:43,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:10:43,089 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2021-05-06 05:10:43,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:10:43,089 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 66 [2021-05-06 05:10:43,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:10:43,090 INFO L225 Difference]: With dead ends: 75 [2021-05-06 05:10:43,090 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 05:10:43,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 13.0ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:10:43,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 05:10:43,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 05:10:43,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 05:10:43,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 05:10:43,093 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 66 [2021-05-06 05:10:43,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:10:43,093 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 05:10:43,094 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (12), 5 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-06 05:10:43,094 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 05:10:43,094 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 05:10:43,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:10:43,310 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-06 05:10:43,661 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (and (<= ~counter~0 0) (<= 0 ~counter~0)) [2021-05-06 05:10:43,661 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 8 10) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point L33(lines 30 42) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (or (and (<= 1 ~counter~0) (<= ~counter~0 1) (= main_~t~0 1) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 1)) (not (= |old(~counter~0)| 0)) (and (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4) (<= 2 ~counter~0))) [2021-05-06 05:10:43,662 INFO L194 CegarLoopUtils]: At program point L31-1(line 31) the Hoare annotation is: (or (and (<= 1 ~counter~0) (<= ~counter~0 1) (= main_~t~0 1) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 1)) (not (= |old(~counter~0)| 0)) (and (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4) (<= 2 ~counter~0))) [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 21 49) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 21 49) no Hoare annotation was computed. [2021-05-06 05:10:43,662 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (or (and (= 5 main_~t~0) (= main_~a~0 2) (= main_~s~0 9)) (and (= main_~a~0 0) (= main_~t~0 1) (= main_~s~0 1)) (not (= |old(~counter~0)| 0)) (and (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4))) [2021-05-06 05:10:43,662 INFO L194 CegarLoopUtils]: At program point L32(line 32) the Hoare annotation is: (or (and (<= 1 ~counter~0) (<= ~counter~0 1) (= main_~t~0 1) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 1)) (not (= |old(~counter~0)| 0)) (and (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4) (<= 2 ~counter~0))) [2021-05-06 05:10:43,662 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 21 49) the Hoare annotation is: (or (= ~counter~0 |old(~counter~0)|) (not (= |old(~counter~0)| 0))) [2021-05-06 05:10:43,662 INFO L198 CegarLoopUtils]: For program point L30-1(lines 30 42) no Hoare annotation was computed. [2021-05-06 05:10:43,663 INFO L194 CegarLoopUtils]: At program point L30-3(lines 30 42) the Hoare annotation is: (or (and (= ~counter~0 |old(~counter~0)|) (= main_~a~0 0) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 1)) (and (<= 1 ~counter~0) (<= ~counter~0 1) (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4)) (not (= |old(~counter~0)| 0)) (and (= 5 main_~t~0) (<= 2 ~counter~0) (= main_~a~0 2) (= main_~s~0 9))) [2021-05-06 05:10:43,663 INFO L194 CegarLoopUtils]: At program point L30-4(lines 30 42) the Hoare annotation is: (or (and (= 5 main_~t~0) (= main_~a~0 2) (= main_~s~0 9)) (not (= |old(~counter~0)| 0)) (and (= main_~t~0 1) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 1)) (and (= main_~s~0 (+ main_~t~0 1)) (= main_~a~0 1) (= main_~s~0 4))) [2021-05-06 05:10:43,663 INFO L194 CegarLoopUtils]: At program point L45(line 45) the Hoare annotation is: (or (and (= main_~t~0 1) (= main_~s~0 1)) (and (= 5 main_~t~0) (= (+ (* main_~t~0 4) 16) (* main_~s~0 4))) (not (= |old(~counter~0)| 0)) (and (= main_~t~0 3) (= main_~s~0 (+ main_~t~0 1)))) [2021-05-06 05:10:43,663 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-06 05:10:43,663 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-06 05:10:43,663 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-06 05:10:43,663 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-06 05:10:43,663 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-06 05:10:43,663 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-06 05:10:43,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 05:10:43 BoogieIcfgContainer [2021-05-06 05:10:43,673 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 05:10:43,673 INFO L168 Benchmark]: Toolchain (without parser) took 6487.96 ms. Allocated memory was 216.0 MB in the beginning and 266.3 MB in the end (delta: 50.3 MB). Free memory was 180.6 MB in the beginning and 122.8 MB in the end (delta: 57.8 MB). Peak memory consumption was 108.3 MB. Max. memory is 8.0 GB. [2021-05-06 05:10:43,673 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 216.0 MB. Free memory is still 197.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 05:10:43,673 INFO L168 Benchmark]: CACSL2BoogieTranslator took 156.79 ms. Allocated memory is still 216.0 MB. Free memory was 180.4 MB in the beginning and 170.3 MB in the end (delta: 10.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 05:10:43,673 INFO L168 Benchmark]: Boogie Preprocessor took 35.70 ms. Allocated memory is still 216.0 MB. Free memory was 170.3 MB in the beginning and 168.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-06 05:10:43,674 INFO L168 Benchmark]: RCFGBuilder took 383.77 ms. Allocated memory is still 216.0 MB. Free memory was 168.9 MB in the beginning and 184.4 MB in the end (delta: -15.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-05-06 05:10:43,674 INFO L168 Benchmark]: TraceAbstraction took 5905.90 ms. Allocated memory was 216.0 MB in the beginning and 266.3 MB in the end (delta: 50.3 MB). Free memory was 183.9 MB in the beginning and 122.8 MB in the end (delta: 61.2 MB). Peak memory consumption was 112.0 MB. Max. memory is 8.0 GB. [2021-05-06 05:10:43,674 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 216.0 MB. Free memory is still 197.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 156.79 ms. Allocated memory is still 216.0 MB. Free memory was 180.4 MB in the beginning and 170.3 MB in the end (delta: 10.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.70 ms. Allocated memory is still 216.0 MB. Free memory was 170.3 MB in the beginning and 168.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 383.77 ms. Allocated memory is still 216.0 MB. Free memory was 168.9 MB in the beginning and 184.4 MB in the end (delta: -15.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5905.90 ms. Allocated memory was 216.0 MB in the beginning and 266.3 MB in the end (delta: 50.3 MB). Free memory was 183.9 MB in the beginning and 122.8 MB in the end (delta: 61.2 MB). Peak memory consumption was 112.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5504.9ms, OverallIterations: 13, TraceHistogramMax: 10, EmptinessCheckTime: 16.6ms, AutomataDifference: 1050.4ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 351.0ms, InitialAbstractionConstructionTime: 7.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 399 SDtfs, 93 SDslu, 1102 SDs, 0 SdLazy, 677 SolverSat, 75 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 505.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 422 GetRequests, 355 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 473.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=12, InterpolantAutomatonStates: 81, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 99.7ms AutomataMinimizationTime, 13 MinimizatonAttempts, 10 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 12 LocationsWithAnnotation, 47 PreInvPairs, 65 NumberOfFragments, 336 HoareAnnotationTreeSize, 47 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 40.6ms HoareSimplificationTime, 12 FomulaSimplificationsInter, 522 FormulaSimplificationTreeSizeReductionInter, 301.5ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 87.9ms SsaConstructionTime, 257.4ms SatisfiabilityAnalysisTime, 1274.7ms InterpolantComputationTime, 434 NumberOfCodeBlocks, 404 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 421 ConstructedInterpolants, 0 QuantifiedInterpolants, 1447 SizeOfPredicates, 18 NumberOfNonLiveVariables, 1584 ConjunctsInSsa, 132 ConjunctsInUnsatCore, 13 InterpolantComputations, 5 PerfectInterpolantSequences, 603/656 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: (((((counter == \old(counter) && a == 0) && a * 2 + 1 == t) && s == 1) || ((((1 <= counter && counter <= 1) && s == t + 1) && a == 1) && s == 4)) || !(\old(counter) == 0)) || (((5 == t && 2 <= counter) && a == 2) && s == 9) RESULT: Ultimate proved your program to be correct! Received shutdown request...