/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/divbin2_valuebound2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:34:52,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:34:52,744 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:34:52,774 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:34:52,815 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:34:52,816 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:34:52,816 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:34:52,817 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 [2021-05-02 14:34:52,862 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:34:52,863 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:34:52,865 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:34:52,865 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:34:52,865 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:34:52,866 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:34:52,866 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:34:52,866 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:34:52,866 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:34:52,866 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:34:52,867 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:34:52,867 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:34:52,867 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:34:52,868 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:34:52,868 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:34:52,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:34:52,868 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:34:52,868 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:34:52,868 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:34:53,129 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:34:53,147 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:34:53,149 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:34:53,150 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:34:53,150 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:34:53,151 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound2.i [2021-05-02 14:34:53,197 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e43a613da/4324b32916d641338bd576f0d2dfc385/FLAG0bda1d878 [2021-05-02 14:34:53,487 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:34:53,487 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound2.i [2021-05-02 14:34:53,491 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e43a613da/4324b32916d641338bd576f0d2dfc385/FLAG0bda1d878 [2021-05-02 14:34:53,943 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e43a613da/4324b32916d641338bd576f0d2dfc385 [2021-05-02 14:34:53,945 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:34:53,947 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:34:53,950 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:34:53,950 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:34:53,952 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:34:53,952 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:34:53" (1/1) ... [2021-05-02 14:34:53,954 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bb04f5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:53, skipping insertion in model container [2021-05-02 14:34:53,954 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:34:53" (1/1) ... [2021-05-02 14:34:53,958 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:34:53,968 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:34:54,042 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/divbin2_valuebound2.i[959,972] [2021-05-02 14:34:54,049 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:34:54,054 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:34:54,061 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/divbin2_valuebound2.i[959,972] [2021-05-02 14:34:54,064 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:34:54,107 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:34:54,107 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54 WrapperNode [2021-05-02 14:34:54,107 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:34:54,108 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:34:54,108 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:34:54,108 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:34:54,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,121 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,124 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,124 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (1/1) ... [2021-05-02 14:34:54,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:34:54,126 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:34:54,126 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:34:54,126 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:34:54,126 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (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 [2021-05-02 14:34:54,202 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:34:54,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:34:54,203 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:34:54,203 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:34:54,203 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:34:54,203 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:34:54,203 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:34:54,203 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:34:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:34:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:34:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:34:54,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:34:54,205 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:34:54,205 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:34:54,206 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:34:54,206 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:34:54,206 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:34:54,207 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:34:54,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:34:54,207 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:34:54,207 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:34:54,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:34:54,417 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:34:54,417 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:34:54,418 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:34:54 BoogieIcfgContainer [2021-05-02 14:34:54,418 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:34:54,419 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:34:54,419 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:34:54,421 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:34:54,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:34:53" (1/3) ... [2021-05-02 14:34:54,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5700075a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:34:54, skipping insertion in model container [2021-05-02 14:34:54,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:34:54" (2/3) ... [2021-05-02 14:34:54,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5700075a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:34:54, skipping insertion in model container [2021-05-02 14:34:54,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:34:54" (3/3) ... [2021-05-02 14:34:54,422 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound2.i [2021-05-02 14:34:54,425 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:34:54,427 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:34:54,437 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:34:54,455 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:34:54,455 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:34:54,455 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:34:54,455 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:34:54,455 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:34:54,455 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:34:54,455 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:34:54,455 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:34:54,464 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:34:54,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:34:54,467 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:54,467 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:54,467 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:54,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:54,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1171333446, now seen corresponding path program 1 times [2021-05-02 14:34:54,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:54,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464550380] [2021-05-02 14:34:54,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:54,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:54,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:34:54,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:54,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:34:54,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:54,590 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:54,591 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:54,591 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464550380] [2021-05-02 14:34:54,591 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464550380] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:34:54,591 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:34:54,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:34:54,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806602175] [2021-05-02 14:34:54,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:34:54,595 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:54,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:34:54,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:34:54,603 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:54,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:54,652 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2021-05-02 14:34:54,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:34:54,654 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 14:34:54,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:54,658 INFO L225 Difference]: With dead ends: 51 [2021-05-02 14:34:54,658 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 14:34:54,660 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:34:54,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 14:34:54,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 14:34:54,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:34:54,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 14:34:54,681 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 18 [2021-05-02 14:34:54,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:54,681 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 14:34:54,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:54,682 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 14:34:54,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 14:34:54,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:54,682 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:54,682 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:34:54,682 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:54,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:54,683 INFO L82 PathProgramCache]: Analyzing trace with hash -73515422, now seen corresponding path program 1 times [2021-05-02 14:34:54,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:54,683 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505066029] [2021-05-02 14:34:54,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:54,694 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:54,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1857268021] [2021-05-02 14:34:54,694 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 [2021-05-02 14:34:54,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:54,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:34:54,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:34:54,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:54,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:55,012 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:55,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:55,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505066029] [2021-05-02 14:34:55,013 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:34:55,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857268021] [2021-05-02 14:34:55,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857268021] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:34:55,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:34:55,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 14:34:55,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811765380] [2021-05-02 14:34:55,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:34:55,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:55,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:34:55,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:34:55,015 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:55,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:55,120 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-05-02 14:34:55,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:34:55,121 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 14:34:55,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:55,122 INFO L225 Difference]: With dead ends: 37 [2021-05-02 14:34:55,122 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:34:55,123 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 113.9ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:34:55,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:34:55,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 14:34:55,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:34:55,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 14:34:55,128 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 14:34:55,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:55,128 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 14:34:55,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:55,129 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 14:34:55,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 14:34:55,129 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:55,129 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:55,347 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:34:55,348 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:55,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:55,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1211706883, now seen corresponding path program 1 times [2021-05-02 14:34:55,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:55,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846642333] [2021-05-02 14:34:55,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:55,365 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:55,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [20143576] [2021-05-02 14:34:55,365 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 [2021-05-02 14:34:55,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:55,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:34:55,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:34:55,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:55,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:55,589 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:55,590 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:55,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846642333] [2021-05-02 14:34:55,590 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:34:55,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20143576] [2021-05-02 14:34:55,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20143576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:34:55,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:34:55,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:34:55,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527521402] [2021-05-02 14:34:55,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:34:55,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:55,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:34:55,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:34:55,591 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:55,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:55,713 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-05-02 14:34:55,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:34:55,714 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 14:34:55,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:55,715 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:34:55,715 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:34:55,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 98.5ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:34:55,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:34:55,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:34:55,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:34:55,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 14:34:55,729 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 21 [2021-05-02 14:34:55,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:55,729 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 14:34:55,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:34:55,730 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 14:34:55,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:34:55,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:55,730 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:55,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:34:55,932 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:55,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:55,933 INFO L82 PathProgramCache]: Analyzing trace with hash 947727214, now seen corresponding path program 1 times [2021-05-02 14:34:55,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:55,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690284408] [2021-05-02 14:34:55,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:55,940 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:55,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [427429002] [2021-05-02 14:34:55,941 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 [2021-05-02 14:34:56,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:56,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:34:56,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:34:56,146 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:56,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:56,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690284408] [2021-05-02 14:34:56,147 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:34:56,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [427429002] [2021-05-02 14:34:56,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [427429002] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:34:56,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:34:56,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:34:56,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182216876] [2021-05-02 14:34:56,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:34:56,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:56,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:34:56,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:34:56,148 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 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) [2021-05-02 14:34:56,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:56,174 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-05-02 14:34:56,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:34:56,174 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 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 27 [2021-05-02 14:34:56,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:56,175 INFO L225 Difference]: With dead ends: 53 [2021-05-02 14:34:56,175 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:34:56,175 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:34:56,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:34:56,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 14:34:56,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 25 states have internal predecessors, (29), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:34:56,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 14:34:56,179 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2021-05-02 14:34:56,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:56,179 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 14:34:56,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 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) [2021-05-02 14:34:56,179 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 14:34:56,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:34:56,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:56,180 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:56,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:34:56,396 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:56,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:56,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1574040585, now seen corresponding path program 1 times [2021-05-02 14:34:56,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:56,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [516112548] [2021-05-02 14:34:56,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:56,407 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:56,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1280721339] [2021-05-02 14:34:56,407 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 [2021-05-02 14:34:56,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:34:56,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 14:34:56,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:34:56,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:56,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:56,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:56,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:56,652 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:56,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:56,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [516112548] [2021-05-02 14:34:56,653 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:34:56,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280721339] [2021-05-02 14:34:56,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280721339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:34:56,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:34:56,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 14:34:56,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121272527] [2021-05-02 14:34:56,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 14:34:56,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:56,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 14:34:56,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:34:56,654 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 12 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:34:56,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:56,772 INFO L93 Difference]: Finished difference Result 72 states and 83 transitions. [2021-05-02 14:34:56,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 14:34:56,775 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:34:56,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:56,775 INFO L225 Difference]: With dead ends: 72 [2021-05-02 14:34:56,775 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 14:34:56,776 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 90.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:34:56,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 14:34:56,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 14:34:56,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:34:56,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2021-05-02 14:34:56,781 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2021-05-02 14:34:56,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:56,782 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2021-05-02 14:34:56,782 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.75) internal successors, (21), 10 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:34:56,782 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2021-05-02 14:34:56,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 14:34:56,782 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:56,782 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:56,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:34:56,983 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:56,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:56,984 INFO L82 PathProgramCache]: Analyzing trace with hash -2129198620, now seen corresponding path program 2 times [2021-05-02 14:34:56,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:56,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [184455781] [2021-05-02 14:34:56,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:56,992 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:56,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [329655286] [2021-05-02 14:34:56,992 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 [2021-05-02 14:34:57,071 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:34:57,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:34:57,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 14:34:57,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:34:57,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:34:57,256 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:34:57,256 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:34:57,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [184455781] [2021-05-02 14:34:57,256 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:34:57,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329655286] [2021-05-02 14:34:57,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329655286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:34:57,256 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:34:57,256 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:34:57,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528379061] [2021-05-02 14:34:57,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:34:57,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:34:57,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:34:57,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:34:57,257 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:34:57,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:34:57,404 INFO L93 Difference]: Finished difference Result 96 states and 111 transitions. [2021-05-02 14:34:57,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:34:57,404 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-05-02 14:34:57,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:34:57,406 INFO L225 Difference]: With dead ends: 96 [2021-05-02 14:34:57,406 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 14:34:57,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 104.9ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:34:57,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 14:34:57,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 66. [2021-05-02 14:34:57,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 47 states have (on average 1.148936170212766) internal successors, (54), 49 states have internal predecessors, (54), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:34:57,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 74 transitions. [2021-05-02 14:34:57,413 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 74 transitions. Word has length 31 [2021-05-02 14:34:57,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:34:57,413 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 74 transitions. [2021-05-02 14:34:57,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:34:57,413 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 74 transitions. [2021-05-02 14:34:57,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 14:34:57,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:34:57,414 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:34:57,630 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:34:57,630 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:34:57,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:34:57,630 INFO L82 PathProgramCache]: Analyzing trace with hash -758101483, now seen corresponding path program 3 times [2021-05-02 14:34:57,631 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:34:57,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690000460] [2021-05-02 14:34:57,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:34:57,644 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:34:57,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [872137300] [2021-05-02 14:34:57,645 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 [2021-05-02 14:35:00,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:35:00,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:35:00,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 14:35:00,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:00,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,494 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:35:00,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:00,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690000460] [2021-05-02 14:35:00,494 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:00,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872137300] [2021-05-02 14:35:00,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872137300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:00,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:00,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:35:00,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108919851] [2021-05-02 14:35:00,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:35:00,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:00,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:35:00,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:35:00,495 INFO L87 Difference]: Start difference. First operand 66 states and 74 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:35:00,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:00,526 INFO L93 Difference]: Finished difference Result 80 states and 91 transitions. [2021-05-02 14:35:00,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:35:00,526 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-05-02 14:35:00,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:00,527 INFO L225 Difference]: With dead ends: 80 [2021-05-02 14:35:00,528 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 14:35:00,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:35:00,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 14:35:00,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 14:35:00,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 41 states have (on average 1.146341463414634) internal successors, (47), 43 states have internal predecessors, (47), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:35:00,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2021-05-02 14:35:00,533 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 37 [2021-05-02 14:35:00,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:00,533 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2021-05-02 14:35:00,533 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 4 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:35:00,533 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2021-05-02 14:35:00,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:35:00,534 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:00,534 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:00,739 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:00,740 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:00,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:00,741 INFO L82 PathProgramCache]: Analyzing trace with hash 826494192, now seen corresponding path program 4 times [2021-05-02 14:35:00,741 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:00,741 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379954018] [2021-05-02 14:35:00,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:00,749 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:00,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1053768737] [2021-05-02 14:35:00,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2021-05-02 14:35:00,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:35:00,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:35:00,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 14:35:00,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:00,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:00,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:01,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:01,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:04,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:06,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:08,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:10,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:12,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:14,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:16,520 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:16,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:16,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:43:16,738 WARN L159 QuantifierPusher]: Ignoring assumption.