/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/ps4-ll_valuebound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:57:16,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:57:16,524 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:57:16,560 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:57:16,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:57:16,591 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:57:16,591 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:57:16,592 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:57:16,593 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:57:16,594 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:57:16,595 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:57:16,596 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:57:16,598 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:57:16,599 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:57:16,600 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:57:16,600 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:57:16,603 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:57:16,609 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:57:16,610 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:57:16,610 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:57:16,613 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 16:57:16,646 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:57:16,646 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:57:16,648 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:57:16,649 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:57:16,649 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:57:16,649 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:57:16,649 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:57:16,649 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:57:16,649 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:57:16,650 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:57:16,650 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:57:16,650 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:57:16,651 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:57:16,651 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:57:16,652 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:57:16,652 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:57:16,653 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:57:16,952 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:57:16,980 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:57:16,982 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:57:16,983 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:57:16,983 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:57:16,984 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_valuebound2.c [2021-05-02 16:57:17,035 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c4f3280d/2012a5529ee94502b693d50dba5b585c/FLAG73cadf34e [2021-05-02 16:57:17,718 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:57:17,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_valuebound2.c [2021-05-02 16:57:17,725 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c4f3280d/2012a5529ee94502b693d50dba5b585c/FLAG73cadf34e [2021-05-02 16:57:17,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c4f3280d/2012a5529ee94502b693d50dba5b585c [2021-05-02 16:57:17,860 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:57:17,866 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:57:17,868 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:57:17,868 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:57:17,871 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:57:17,872 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:57:17" (1/1) ... [2021-05-02 16:57:17,873 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@687141fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:17, skipping insertion in model container [2021-05-02 16:57:17,874 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:57:17" (1/1) ... [2021-05-02 16:57:17,879 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:57:17,892 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:57:18,062 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/ps4-ll_valuebound2.c[458,471] [2021-05-02 16:57:18,077 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:57:18,083 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:57:18,094 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/ps4-ll_valuebound2.c[458,471] [2021-05-02 16:57:18,110 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:57:18,121 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:57:18,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18 WrapperNode [2021-05-02 16:57:18,122 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:57:18,124 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:57:18,124 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:57:18,126 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:57:18,134 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,134 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,140 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,140 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,152 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,155 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,155 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (1/1) ... [2021-05-02 16:57:18,157 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:57:18,157 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:57:18,158 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:57:18,158 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:57:18,158 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (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 16:57:18,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:57:18,215 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:57:18,215 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:57:18,215 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:57:18,215 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:57:18,216 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:57:18,216 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:57:18,217 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:57:18,401 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:57:18,401 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:57:18,402 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:57:18 BoogieIcfgContainer [2021-05-02 16:57:18,403 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:57:18,404 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:57:18,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:57:18,406 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:57:18,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:57:17" (1/3) ... [2021-05-02 16:57:18,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3eb56548 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:57:18, skipping insertion in model container [2021-05-02 16:57:18,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:57:18" (2/3) ... [2021-05-02 16:57:18,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3eb56548 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:57:18, skipping insertion in model container [2021-05-02 16:57:18,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:57:18" (3/3) ... [2021-05-02 16:57:18,408 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_valuebound2.c [2021-05-02 16:57:18,420 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:57:18,423 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:57:18,449 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:57:18,491 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:57:18,492 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:57:18,492 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:57:18,492 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:57:18,492 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:57:18,492 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:57:18,492 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:57:18,492 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:57:18,520 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:57:18,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:57:18,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:18,524 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:18,524 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:18,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:18,528 INFO L82 PathProgramCache]: Analyzing trace with hash -630235283, now seen corresponding path program 1 times [2021-05-02 16:57:18,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:18,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1253841207] [2021-05-02 16:57:18,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:18,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:18,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:57:18,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:18,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 16:57:18,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:18,801 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 16:57:18,801 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:18,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1253841207] [2021-05-02 16:57:18,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1253841207] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:57:18,803 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:57:18,803 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:57:18,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004320877] [2021-05-02 16:57:18,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:57:18,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:18,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:57:18,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:57:18,829 INFO L87 Difference]: Start difference. First operand has 28 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 16:57:20,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:20,919 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2021-05-02 16:57:20,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:57:20,920 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17 [2021-05-02 16:57:20,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:20,926 INFO L225 Difference]: With dead ends: 47 [2021-05-02 16:57:20,926 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 16:57:20,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 54.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:57:20,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 16:57:20,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-02 16:57:20,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:57:20,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-02 16:57:20,957 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 17 [2021-05-02 16:57:20,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:20,957 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-02 16:57:20,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 16:57:20,958 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-02 16:57:20,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 16:57:20,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:20,959 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:20,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:57:20,959 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:20,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:20,960 INFO L82 PathProgramCache]: Analyzing trace with hash 51610547, now seen corresponding path program 1 times [2021-05-02 16:57:20,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:20,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829774698] [2021-05-02 16:57:20,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:20,974 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:20,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [964745845] [2021-05-02 16:57:20,975 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 16:57:21,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:21,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 16:57:21,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:57:21,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:21,154 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 16:57:21,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:21,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829774698] [2021-05-02 16:57:21,155 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:57:21,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964745845] [2021-05-02 16:57:21,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964745845] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:57:21,156 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:57:21,156 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 16:57:21,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237725711] [2021-05-02 16:57:21,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:57:21,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:21,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:57:21,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:57:21,158 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:57:21,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:21,225 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 16:57:21,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 16:57:21,225 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 16:57:21,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:21,226 INFO L225 Difference]: With dead ends: 34 [2021-05-02 16:57:21,226 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 16:57:21,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 40.6ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:57:21,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 16:57:21,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 16:57:21,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:57:21,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 16:57:21,235 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2021-05-02 16:57:21,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:21,236 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 16:57:21,236 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 16:57:21,236 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 16:57:21,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 16:57:21,237 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:21,237 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] [2021-05-02 16:57:21,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:57:21,453 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:21,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:21,453 INFO L82 PathProgramCache]: Analyzing trace with hash 311787922, now seen corresponding path program 1 times [2021-05-02 16:57:21,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:21,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [301108446] [2021-05-02 16:57:21,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:21,469 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:21,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [828115480] [2021-05-02 16:57:21,469 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 16:57:21,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:21,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:57:21,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:57:21,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:21,620 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:57:21,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:21,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [301108446] [2021-05-02 16:57:21,621 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:57:21,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828115480] [2021-05-02 16:57:21,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828115480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:57:21,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:57:21,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:57:21,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700129680] [2021-05-02 16:57:21,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:57:21,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:21,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:57:21,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:57:21,623 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:57:21,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:21,724 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-05-02 16:57:21,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:57:21,724 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 16:57:21,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:21,727 INFO L225 Difference]: With dead ends: 41 [2021-05-02 16:57:21,727 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 16:57:21,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 52.9ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:57:21,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 16:57:21,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 16:57:21,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:57:21,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2021-05-02 16:57:21,744 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 24 [2021-05-02 16:57:21,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:21,745 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2021-05-02 16:57:21,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 16:57:21,745 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2021-05-02 16:57:21,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 16:57:21,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:21,746 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:21,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:57:21,961 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:21,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:21,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1417466424, now seen corresponding path program 1 times [2021-05-02 16:57:21,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:21,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108927916] [2021-05-02 16:57:21,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:21,973 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:21,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1119578184] [2021-05-02 16:57:21,973 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 16:57:22,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:57:22,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 16:57:22,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:57:22,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:22,182 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 16:57:22,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:22,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108927916] [2021-05-02 16:57:22,182 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:57:22,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119578184] [2021-05-02 16:57:22,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119578184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:57:22,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:57:22,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 16:57:22,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149135267] [2021-05-02 16:57:22,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 16:57:22,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:22,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 16:57:22,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:57:22,184 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:57:22,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:22,287 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-05-02 16:57:22,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 16:57:22,288 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 30 [2021-05-02 16:57:22,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:22,289 INFO L225 Difference]: With dead ends: 44 [2021-05-02 16:57:22,289 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 16:57:22,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 91.8ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 16:57:22,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 16:57:22,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-05-02 16:57:22,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:57:22,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 16:57:22,296 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2021-05-02 16:57:22,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:22,297 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 16:57:22,297 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:57:22,297 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 16:57:22,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 16:57:22,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:22,298 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:22,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:57:22,519 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:22,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:22,520 INFO L82 PathProgramCache]: Analyzing trace with hash -965543213, now seen corresponding path program 2 times [2021-05-02 16:57:22,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:22,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450887272] [2021-05-02 16:57:22,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:22,536 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:22,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1101587117] [2021-05-02 16:57:22,536 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 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 16:57:22,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:57:22,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:57:22,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 16:57:22,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:57:22,758 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 16:57:22,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:22,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450887272] [2021-05-02 16:57:22,759 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:57:22,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101587117] [2021-05-02 16:57:22,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101587117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:57:22,759 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:57:22,759 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:57:22,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765410910] [2021-05-02 16:57:22,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:57:22,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:22,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:57:22,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:57:22,764 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:57:24,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:24,931 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2021-05-02 16:57:24,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:57:24,931 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-02 16:57:24,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:24,932 INFO L225 Difference]: With dead ends: 48 [2021-05-02 16:57:24,932 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 16:57:24,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 81.3ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:57:24,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 16:57:24,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 16:57:24,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:57:24,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-02 16:57:24,941 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 31 [2021-05-02 16:57:24,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:24,941 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-02 16:57:24,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 16:57:24,941 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-02 16:57:24,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 16:57:24,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:24,942 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:25,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:57:25,157 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:25,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:25,157 INFO L82 PathProgramCache]: Analyzing trace with hash -2045316535, now seen corresponding path program 2 times [2021-05-02 16:57:25,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:25,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [794813812] [2021-05-02 16:57:25,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:25,178 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:25,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1972224739] [2021-05-02 16:57:25,178 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 16:57:25,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:57:25,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:57:25,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 16:57:25,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:57:25,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,552 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:25,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:26,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:26,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:26,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:57:26,079 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 14 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 16:57:26,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:57:26,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [794813812] [2021-05-02 16:57:26,079 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:57:26,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972224739] [2021-05-02 16:57:26,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972224739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:57:26,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:57:26,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 16:57:26,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949729334] [2021-05-02 16:57:26,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 16:57:26,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:57:26,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 16:57:26,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 16:57:26,081 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 11 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 16:57:28,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:28,380 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-05-02 16:57:28,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 16:57:28,381 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 11 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-02 16:57:28,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:28,381 INFO L225 Difference]: With dead ends: 51 [2021-05-02 16:57:28,381 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 16:57:28,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 689.4ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 16:57:28,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 16:57:28,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 16:57:28,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:57:28,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-02 16:57:28,389 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2021-05-02 16:57:28,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:28,390 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-02 16:57:28,390 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 11 states have internal predecessors, (22), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 16:57:28,390 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-02 16:57:28,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 16:57:28,391 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:28,391 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:57:28,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 16:57:28,612 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:57:28,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:57:28,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1045939826, now seen corresponding path program 3 times [2021-05-02 16:57:28,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:57:28,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402156683] [2021-05-02 16:57:28,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:57:28,621 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:57:28,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1135922816] [2021-05-02 16:57:28,621 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