/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/ps6-ll_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 05:02:37,498 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 05:02:37,500 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 05:02:37,537 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 05:02:37,557 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 05:02:37,559 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 05:02:37,562 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 05:02:37,563 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 05:02:37,566 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 05:02:37,567 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 05:02:37,569 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 05:02:37,576 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 05:02:37,577 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 05:02:37,578 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 05:02:37,588 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 05:02:37,590 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 05:02:37,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 05:02:37,604 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 05:02:37,605 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 05:02:37,605 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 05:02:37,609 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-06 05:02:37,639 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 05:02:37,640 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 05:02:37,641 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 05:02:37,641 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 05:02:37,641 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 05:02:37,641 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 05:02:37,641 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 05:02:37,642 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 05:02:37,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 05:02:37,643 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:02:37,644 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 05:02:37,644 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 05:02:37,645 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 05:02:37,930 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 05:02:37,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 05:02:37,954 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 05:02:37,955 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 05:02:37,956 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 05:02:37,957 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound5.c [2021-05-06 05:02:38,026 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a629be89/62f38f2fa55548fca01584494eef5e37/FLAGf507d28a0 [2021-05-06 05:02:38,384 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 05:02:38,385 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_unwindbound5.c [2021-05-06 05:02:38,391 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a629be89/62f38f2fa55548fca01584494eef5e37/FLAGf507d28a0 [2021-05-06 05:02:38,403 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a629be89/62f38f2fa55548fca01584494eef5e37 [2021-05-06 05:02:38,409 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 05:02:38,410 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 05:02:38,412 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 05:02:38,412 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 05:02:38,415 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 05:02:38,416 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,417 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@361370a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38, skipping insertion in model container [2021-05-06 05:02:38,417 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,424 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 05:02:38,441 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 05:02:38,592 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/ps6-ll_unwindbound5.c[458,471] [2021-05-06 05:02:38,618 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:02:38,626 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 05:02:38,647 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/ps6-ll_unwindbound5.c[458,471] [2021-05-06 05:02:38,689 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 05:02:38,700 INFO L208 MainTranslator]: Completed translation [2021-05-06 05:02:38,708 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38 WrapperNode [2021-05-06 05:02:38,708 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 05:02:38,710 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 05:02:38,710 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 05:02:38,711 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 05:02:38,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,727 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,728 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,739 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,744 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,748 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... [2021-05-06 05:02:38,753 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 05:02:38,755 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 05:02:38,755 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 05:02:38,755 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 05:02:38,756 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 05:02:38,829 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 05:02:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 05:02:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 05:02:38,830 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 05:02:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 05:02:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 05:02:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 05:02:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 05:02:38,831 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 05:02:38,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 05:02:38,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 05:02:38,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 05:02:38,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 05:02:38,832 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 05:02:38,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 05:02:39,058 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 05:02:39,058 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 05:02:39,059 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:02:39 BoogieIcfgContainer [2021-05-06 05:02:39,059 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 05:02:39,081 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 05:02:39,081 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 05:02:39,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 05:02:39,084 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 05:02:38" (1/3) ... [2021-05-06 05:02:39,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f81d38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:02:39, skipping insertion in model container [2021-05-06 05:02:39,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 05:02:38" (2/3) ... [2021-05-06 05:02:39,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8f81d38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 05:02:39, skipping insertion in model container [2021-05-06 05:02:39,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 05:02:39" (3/3) ... [2021-05-06 05:02:39,086 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_unwindbound5.c [2021-05-06 05:02:39,091 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 05:02:39,093 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 05:02:39,122 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 05:02:39,156 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 05:02:39,157 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 05:02:39,157 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 05:02:39,157 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 05:02:39,157 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 05:02:39,157 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 05:02:39,157 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 05:02:39,157 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 05:02:39,202 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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) [2021-05-06 05:02:39,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 05:02:39,206 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:39,206 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:39,207 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:39,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:39,211 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-06 05:02:39,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:39,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330463627] [2021-05-06 05:02:39,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:39,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:39,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 05:02:39,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:39,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 05:02:39,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:39,517 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:39,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:39,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330463627] [2021-05-06 05:02:39,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330463627] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:02:39,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:02:39,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 05:02:39,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593817893] [2021-05-06 05:02:39,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 05:02:39,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:39,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 05:02:39,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:02:39,538 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 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) [2021-05-06 05:02:39,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:39,705 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-06 05:02:39,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 05:02:39,707 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 [2021-05-06 05:02:39,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:39,712 INFO L225 Difference]: With dead ends: 50 [2021-05-06 05:02:39,713 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 05:02:39,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 59.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 05:02:39,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 05:02:39,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 05:02:39,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 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) [2021-05-06 05:02:39,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-06 05:02:39,746 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-06 05:02:39,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:39,746 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-06 05:02:39,746 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) [2021-05-06 05:02:39,746 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-06 05:02:39,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 05:02:39,748 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:39,748 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:39,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 05:02:39,748 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:39,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:39,749 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-06 05:02:39,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:39,749 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294766565] [2021-05-06 05:02:39,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:39,763 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:39,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1449097198] [2021-05-06 05:02:39,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:39,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:39,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 05:02:39,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:39,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:39,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:39,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:39,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294766565] [2021-05-06 05:02:39,934 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:39,934 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1449097198] [2021-05-06 05:02:39,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1449097198] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:02:39,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:02:39,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 05:02:39,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197625019] [2021-05-06 05:02:39,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 05:02:39,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:39,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 05:02:39,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:02:39,937 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:02:39,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:39,949 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 05:02:39,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 05:02:39,950 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 05:02:39,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:39,950 INFO L225 Difference]: With dead ends: 34 [2021-05-06 05:02:39,951 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 05:02:39,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 05:02:39,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 05:02:39,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 05:02:39,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 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) [2021-05-06 05:02:39,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-06 05:02:39,957 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-06 05:02:39,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:39,957 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-06 05:02:39,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 05:02:39,958 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-06 05:02:39,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 05:02:39,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:39,958 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:40,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 05:02:40,183 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:40,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:40,183 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-06 05:02:40,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:40,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554192145] [2021-05-06 05:02:40,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:40,198 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:40,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2079761002] [2021-05-06 05:02:40,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:40,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:40,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:02:40,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:40,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,316 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:40,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554192145] [2021-05-06 05:02:40,317 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079761002] [2021-05-06 05:02:40,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079761002] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 05:02:40,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 05:02:40,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 05:02:40,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666755199] [2021-05-06 05:02:40,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:02:40,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:40,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:02:40,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:02:40,319 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:02:40,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:40,364 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 05:02:40,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 05:02:40,365 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 05:02:40,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:40,366 INFO L225 Difference]: With dead ends: 36 [2021-05-06 05:02:40,366 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 05:02:40,366 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:02:40,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 05:02:40,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 05:02:40,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 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) [2021-05-06 05:02:40,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 05:02:40,375 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-06 05:02:40,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:40,375 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 05:02:40,376 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 05:02:40,376 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 05:02:40,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 05:02:40,377 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:40,377 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:40,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:40,593 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:40,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:40,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-06 05:02:40,594 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:40,594 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27117147] [2021-05-06 05:02:40,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:40,606 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:40,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1254947338] [2021-05-06 05:02:40,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:40,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:40,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 05:02:40,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:40,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:40,785 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:40,785 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:40,785 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27117147] [2021-05-06 05:02:40,785 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:40,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1254947338] [2021-05-06 05:02:40,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1254947338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:40,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:40,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 05:02:40,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637845287] [2021-05-06 05:02:40,786 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 05:02:40,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:40,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 05:02:40,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 05:02:40,787 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:02:40,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:40,829 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 05:02:40,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:02:40,830 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 05:02:40,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:40,831 INFO L225 Difference]: With dead ends: 42 [2021-05-06 05:02:40,831 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 05:02:40,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 19.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:02:40,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 05:02:40,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 05:02:40,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 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) [2021-05-06 05:02:40,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 05:02:40,838 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-06 05:02:40,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:40,838 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 05:02:40,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 05:02:40,838 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 05:02:40,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 05:02:40,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:40,839 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] [2021-05-06 05:02:41,054 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,055 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:41,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:41,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-06 05:02:41,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:41,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596221595] [2021-05-06 05:02:41,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:41,064 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:41,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1289317621] [2021-05-06 05:02:41,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:41,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 05:02:41,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:41,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:41,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:41,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596221595] [2021-05-06 05:02:41,242 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:41,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1289317621] [2021-05-06 05:02:41,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1289317621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:41,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:41,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:02:41,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449088666] [2021-05-06 05:02:41,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:02:41,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:41,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:02:41,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:02:41,244 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2021-05-06 05:02:41,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:41,311 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 05:02:41,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 05:02:41,311 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 26 [2021-05-06 05:02:41,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:41,312 INFO L225 Difference]: With dead ends: 44 [2021-05-06 05:02:41,312 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 05:02:41,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.9ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:41,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 05:02:41,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 05:02:41,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:41,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-06 05:02:41,320 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-06 05:02:41,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:41,320 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-06 05:02:41,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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) [2021-05-06 05:02:41,321 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-06 05:02:41,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:02:41,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:41,322 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:41,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,545 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:41,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:41,545 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-06 05:02:41,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:41,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288236594] [2021-05-06 05:02:41,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:41,558 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:41,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1733747019] [2021-05-06 05:02:41,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:41,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:41,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:41,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 05:02:41,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:41,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:41,744 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 05:02:41,745 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:41,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288236594] [2021-05-06 05:02:41,745 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:41,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733747019] [2021-05-06 05:02:41,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733747019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:41,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:41,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 05:02:41,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818655108] [2021-05-06 05:02:41,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 05:02:41,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:41,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 05:02:41,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 05:02:41,747 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:02:45,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:45,553 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 05:02:45,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 05:02:45,561 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-06 05:02:45,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:45,562 INFO L225 Difference]: With dead ends: 58 [2021-05-06 05:02:45,563 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 05:02:45,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 25.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:02:45,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 05:02:45,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 05:02:45,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 05:02:45,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-06 05:02:45,570 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-06 05:02:45,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:45,571 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-06 05:02:45,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 05:02:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-06 05:02:45,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 05:02:45,571 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:45,571 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:45,772 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 05:02:45,772 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:45,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:45,772 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-06 05:02:45,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:45,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618524608] [2021-05-06 05:02:45,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:45,792 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:45,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1595083341] [2021-05-06 05:02:45,792 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:45,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:45,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:45,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 05:02:45,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:46,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,094 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 05:02:46,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:46,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618524608] [2021-05-06 05:02:46,095 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:46,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1595083341] [2021-05-06 05:02:46,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1595083341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:46,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:46,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:46,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736060167] [2021-05-06 05:02:46,098 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:46,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:46,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:46,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:46,099 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-05-06 05:02:46,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:46,180 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-06 05:02:46,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:46,180 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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 34 [2021-05-06 05:02:46,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:46,181 INFO L225 Difference]: With dead ends: 56 [2021-05-06 05:02:46,181 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 05:02:46,182 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 57.7ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 05:02:46,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 05:02:46,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-06 05:02:46,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 05:02:46,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-06 05:02:46,190 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-06 05:02:46,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:46,191 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-06 05:02:46,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 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) [2021-05-06 05:02:46,191 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-06 05:02:46,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 05:02:46,192 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:46,192 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:46,398 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:46,398 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:46,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:46,398 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-06 05:02:46,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:46,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1698755578] [2021-05-06 05:02:46,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:46,408 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:46,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1397419585] [2021-05-06 05:02:46,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:46,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 05:02:46,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:02:46,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:46,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:46,647 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 05:02:46,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:46,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1698755578] [2021-05-06 05:02:46,647 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:46,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397419585] [2021-05-06 05:02:46,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397419585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:46,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:46,647 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:46,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527340300] [2021-05-06 05:02:46,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:46,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:46,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:46,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:46,649 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 05:02:46,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:46,719 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-06 05:02:46,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:46,719 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-06 05:02:46,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:46,723 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:02:46,724 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 05:02:46,724 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 48.7ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:46,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 05:02:46,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 05:02:46,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 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) [2021-05-06 05:02:46,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-06 05:02:46,739 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-06 05:02:46,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:46,741 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-06 05:02:46,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 05:02:46,742 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-06 05:02:46,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 05:02:46,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:46,745 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:46,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:46,961 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:46,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:46,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-06 05:02:46,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:46,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4363126] [2021-05-06 05:02:46,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:46,971 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:46,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [914121067] [2021-05-06 05:02:46,971 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:48,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-06 05:02:48,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:48,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 05:02:48,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:48,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:48,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:48,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:48,601 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 05:02:48,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 05:02:48,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4363126] [2021-05-06 05:02:48,601 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 05:02:48,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914121067] [2021-05-06 05:02:48,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914121067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 05:02:48,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 05:02:48,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 05:02:48,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071590046] [2021-05-06 05:02:48,602 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 05:02:48,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 05:02:48,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 05:02:48,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 05:02:48,603 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:02:48,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 05:02:48,676 INFO L93 Difference]: Finished difference Result 55 states and 59 transitions. [2021-05-06 05:02:48,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 05:02:48,676 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) Word has length 42 [2021-05-06 05:02:48,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 05:02:48,679 INFO L225 Difference]: With dead ends: 55 [2021-05-06 05:02:48,679 INFO L226 Difference]: Without dead ends: 51 [2021-05-06 05:02:48,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 74.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 05:02:48,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-06 05:02:48,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2021-05-06 05:02:48,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 states have internal predecessors, (32), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 05:02:48,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-05-06 05:02:48,695 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 42 [2021-05-06 05:02:48,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 05:02:48,696 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-05-06 05:02:48,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 2 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 05:02:48,696 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-05-06 05:02:48,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-06 05:02:48,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 05:02:48,698 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 05:02:48,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 05:02:48,907 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 05:02:48,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 05:02:48,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1537538120, now seen corresponding path program 2 times [2021-05-06 05:02:48,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 05:02:48,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637647504] [2021-05-06 05:02:48,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 05:02:48,933 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 05:02:48,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1957846347] [2021-05-06 05:02:48,934 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 05:02:49,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 05:02:49,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 05:02:49,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 05:02:49,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 05:02:49,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 05:02:49,275 WARN L159 QuantifierPusher]: Ignoring assumption.