/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/hard2_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 03:30:16,496 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 03:30:16,497 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 03:30:16,515 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 03:30:16,522 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 03:30:16,523 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 03:30:16,523 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 03:30:16,524 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 03:30:16,525 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 03:30:16,525 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 03:30:16,526 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 03:30:16,547 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 03:30:16,548 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 03:30:16,549 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 03:30:16,549 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 03:30:16,550 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 03:30:16,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 03:30:16,560 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 03:30:16,561 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 03:30:16,562 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 03:30:16,564 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 03:30:16,590 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 03:30:16,591 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 03:30:16,593 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 03:30:16,593 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 03:30:16,593 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 03:30:16,593 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 03:30:16,593 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 03:30:16,593 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 03:30:16,594 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 03:30:16,594 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 03:30:16,594 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 03:30:16,594 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 03:30:16,594 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 03:30:16,595 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 03:30:16,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 03:30:16,596 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 03:30:16,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 03:30:16,596 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 03:30:16,829 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 03:30:16,847 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 03:30:16,848 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 03:30:16,849 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 03:30:16,850 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 03:30:16,851 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound20.c [2021-05-06 03:30:16,905 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f238f2219/9021d601e8c04b3eb645587cf88de883/FLAG3f7b3b003 [2021-05-06 03:30:17,188 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 03:30:17,189 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_unwindbound20.c [2021-05-06 03:30:17,193 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f238f2219/9021d601e8c04b3eb645587cf88de883/FLAG3f7b3b003 [2021-05-06 03:30:17,630 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f238f2219/9021d601e8c04b3eb645587cf88de883 [2021-05-06 03:30:17,635 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 03:30:17,636 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 03:30:17,637 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 03:30:17,638 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 03:30:17,640 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 03:30:17,641 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,642 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fa009c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17, skipping insertion in model container [2021-05-06 03:30:17,643 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,647 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 03:30:17,658 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 03:30:17,777 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/hard2_unwindbound20.c[526,539] [2021-05-06 03:30:17,790 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:30:17,798 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 03:30:17,839 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/hard2_unwindbound20.c[526,539] [2021-05-06 03:30:17,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:30:17,862 INFO L208 MainTranslator]: Completed translation [2021-05-06 03:30:17,862 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17 WrapperNode [2021-05-06 03:30:17,862 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 03:30:17,864 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 03:30:17,866 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 03:30:17,867 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 03:30:17,874 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,880 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,892 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,901 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (1/1) ... [2021-05-06 03:30:17,905 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 03:30:17,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 03:30:17,905 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 03:30:17,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 03:30:17,906 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (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 03:30:17,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 03:30:17,976 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 03:30:17,976 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 03:30:17,977 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 03:30:17,977 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 03:30:17,977 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 03:30:17,977 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 03:30:17,977 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 03:30:17,977 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 03:30:17,978 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 03:30:17,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 03:30:17,978 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 03:30:17,978 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 03:30:17,978 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 03:30:17,979 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 03:30:18,184 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 03:30:18,184 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 03:30:18,185 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:30:18 BoogieIcfgContainer [2021-05-06 03:30:18,185 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 03:30:18,186 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 03:30:18,186 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 03:30:18,205 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 03:30:18,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 03:30:17" (1/3) ... [2021-05-06 03:30:18,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@551db1fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:30:18, skipping insertion in model container [2021-05-06 03:30:18,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:30:17" (2/3) ... [2021-05-06 03:30:18,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@551db1fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:30:18, skipping insertion in model container [2021-05-06 03:30:18,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:30:18" (3/3) ... [2021-05-06 03:30:18,207 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_unwindbound20.c [2021-05-06 03:30:18,211 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 03:30:18,213 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 03:30:18,223 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 03:30:18,237 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 03:30:18,237 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 03:30:18,238 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 03:30:18,238 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 03:30:18,238 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 03:30:18,238 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 03:30:18,238 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 03:30:18,238 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 03:30:18,247 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 03:30:18,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 03:30:18,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:18,251 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:18,251 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:18,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:18,256 INFO L82 PathProgramCache]: Analyzing trace with hash -1682617676, now seen corresponding path program 1 times [2021-05-06 03:30:18,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:18,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170674528] [2021-05-06 03:30:18,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:18,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:18,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:30:18,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:18,454 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 03:30:18,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:18,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170674528] [2021-05-06 03:30:18,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170674528] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:18,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:18,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 03:30:18,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044261401] [2021-05-06 03:30:18,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 03:30:18,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:18,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 03:30:18,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:30:18,472 INFO L87 Difference]: Start difference. First operand has 31 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 18 states have internal predecessors, (26), 9 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:18,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:18,572 INFO L93 Difference]: Finished difference Result 57 states and 91 transitions. [2021-05-06 03:30:18,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 03:30:18,573 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 03:30:18,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:18,578 INFO L225 Difference]: With dead ends: 57 [2021-05-06 03:30:18,578 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 03:30:18,580 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:30:18,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 03:30:18,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 03:30:18,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 9 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 03:30:18,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2021-05-06 03:30:18,612 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12 [2021-05-06 03:30:18,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:18,612 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2021-05-06 03:30:18,613 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:18,613 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2021-05-06 03:30:18,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 03:30:18,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:18,613 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:18,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 03:30:18,614 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:18,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:18,618 INFO L82 PathProgramCache]: Analyzing trace with hash -2144676086, now seen corresponding path program 1 times [2021-05-06 03:30:18,618 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:18,618 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099682843] [2021-05-06 03:30:18,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:18,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:18,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:30:18,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:18,725 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 03:30:18,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:18,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099682843] [2021-05-06 03:30:18,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099682843] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:18,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:18,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:30:18,726 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822693549] [2021-05-06 03:30:18,726 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:18,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:18,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:18,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:18,727 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:18,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:18,994 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2021-05-06 03:30:18,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:30:18,995 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 03:30:18,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:18,996 INFO L225 Difference]: With dead ends: 41 [2021-05-06 03:30:18,996 INFO L226 Difference]: Without dead ends: 39 [2021-05-06 03:30:18,997 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 178.4ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:30:18,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-06 03:30:19,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 30. [2021-05-06 03:30:19,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 03:30:19,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-05-06 03:30:19,004 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 12 [2021-05-06 03:30:19,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:19,004 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-05-06 03:30:19,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:19,004 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-05-06 03:30:19,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 03:30:19,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:19,005 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:19,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 03:30:19,005 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:19,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:19,005 INFO L82 PathProgramCache]: Analyzing trace with hash 1842794081, now seen corresponding path program 1 times [2021-05-06 03:30:19,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:19,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650424430] [2021-05-06 03:30:19,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:19,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:30:19,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,069 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 03:30:19,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:19,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650424430] [2021-05-06 03:30:19,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [650424430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:19,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:19,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 03:30:19,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694015246] [2021-05-06 03:30:19,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:30:19,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:19,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:30:19,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:19,079 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:19,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:19,196 INFO L93 Difference]: Finished difference Result 46 states and 61 transitions. [2021-05-06 03:30:19,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:30:19,197 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 03:30:19,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:19,198 INFO L225 Difference]: With dead ends: 46 [2021-05-06 03:30:19,198 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 03:30:19,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.4ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:19,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 03:30:19,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 03:30:19,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 20 states have internal predecessors, (25), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 03:30:19,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2021-05-06 03:30:19,209 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2021-05-06 03:30:19,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:19,209 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2021-05-06 03:30:19,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 03:30:19,209 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2021-05-06 03:30:19,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 03:30:19,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:19,210 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:19,210 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 03:30:19,210 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:19,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:19,210 INFO L82 PathProgramCache]: Analyzing trace with hash 311129497, now seen corresponding path program 1 times [2021-05-06 03:30:19,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:19,211 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068718936] [2021-05-06 03:30:19,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:19,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:30:19,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-05-06 03:30:19,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:30:19,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:19,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068718936] [2021-05-06 03:30:19,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068718936] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:19,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:19,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:30:19,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151805847] [2021-05-06 03:30:19,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:19,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:19,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:19,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:19,310 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 03:30:19,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:19,499 INFO L93 Difference]: Finished difference Result 46 states and 60 transitions. [2021-05-06 03:30:19,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:30:19,500 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-06 03:30:19,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:19,501 INFO L225 Difference]: With dead ends: 46 [2021-05-06 03:30:19,501 INFO L226 Difference]: Without dead ends: 44 [2021-05-06 03:30:19,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 122.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:30:19,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-06 03:30:19,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 36. [2021-05-06 03:30:19,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 23 states have internal predecessors, (28), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 03:30:19,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2021-05-06 03:30:19,515 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 17 [2021-05-06 03:30:19,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:19,515 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2021-05-06 03:30:19,515 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 03:30:19,515 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2021-05-06 03:30:19,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-06 03:30:19,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:19,516 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:19,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 03:30:19,516 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:19,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:19,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1912623062, now seen corresponding path program 1 times [2021-05-06 03:30:19,516 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:19,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477924018] [2021-05-06 03:30:19,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:19,540 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:19,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [13906827] [2021-05-06 03:30:19,540 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 03:30:19,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:19,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:30:19,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:19,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:19,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 03:30:19,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:19,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477924018] [2021-05-06 03:30:19,751 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:19,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13906827] [2021-05-06 03:30:19,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13906827] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:19,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:19,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:30:19,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875388719] [2021-05-06 03:30:19,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:30:19,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:19,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:30:19,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:19,753 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:30:19,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:19,798 INFO L93 Difference]: Finished difference Result 65 states and 87 transitions. [2021-05-06 03:30:19,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:30:19,799 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-06 03:30:19,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:19,799 INFO L225 Difference]: With dead ends: 65 [2021-05-06 03:30:19,799 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 03:30:19,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.3ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:19,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 03:30:19,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-05-06 03:30:19,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 29 states have (on average 1.2758620689655173) internal successors, (37), 31 states have internal predecessors, (37), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 03:30:19,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 64 transitions. [2021-05-06 03:30:19,805 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 64 transitions. Word has length 22 [2021-05-06 03:30:19,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:19,806 INFO L480 AbstractCegarLoop]: Abstraction has 50 states and 64 transitions. [2021-05-06 03:30:19,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:30:19,806 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 64 transitions. [2021-05-06 03:30:19,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 03:30:19,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:19,807 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:20,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:20,013 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:20,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:20,014 INFO L82 PathProgramCache]: Analyzing trace with hash 214651490, now seen corresponding path program 1 times [2021-05-06 03:30:20,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:20,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959065023] [2021-05-06 03:30:20,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:20,020 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:20,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1290880507] [2021-05-06 03:30:20,020 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 03:30:20,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:20,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:30:20,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:20,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,206 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:30:20,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:20,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959065023] [2021-05-06 03:30:20,207 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:20,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1290880507] [2021-05-06 03:30:20,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1290880507] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:20,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:20,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:30:20,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799627292] [2021-05-06 03:30:20,208 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:30:20,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:20,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:30:20,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:20,209 INFO L87 Difference]: Start difference. First operand 50 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:30:20,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:20,240 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-05-06 03:30:20,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:30:20,240 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 03:30:20,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:20,242 INFO L225 Difference]: With dead ends: 70 [2021-05-06 03:30:20,242 INFO L226 Difference]: Without dead ends: 63 [2021-05-06 03:30:20,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:20,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-06 03:30:20,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-05-06 03:30:20,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-06 03:30:20,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 72 transitions. [2021-05-06 03:30:20,258 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 72 transitions. Word has length 30 [2021-05-06 03:30:20,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:20,258 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 72 transitions. [2021-05-06 03:30:20,259 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:30:20,259 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 72 transitions. [2021-05-06 03:30:20,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-06 03:30:20,260 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:20,260 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:20,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:20,479 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:20,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:20,479 INFO L82 PathProgramCache]: Analyzing trace with hash 216379368, now seen corresponding path program 1 times [2021-05-06 03:30:20,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:20,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572497287] [2021-05-06 03:30:20,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:20,485 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:20,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [87494231] [2021-05-06 03:30:20,485 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 03:30:20,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:20,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:30:20,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:20,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,610 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:30:20,610 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:20,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572497287] [2021-05-06 03:30:20,610 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:20,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [87494231] [2021-05-06 03:30:20,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [87494231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:20,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:20,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:30:20,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570640819] [2021-05-06 03:30:20,611 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:30:20,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:20,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:30:20,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:20,612 INFO L87 Difference]: Start difference. First operand 62 states and 72 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:30:20,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:20,654 INFO L93 Difference]: Finished difference Result 76 states and 91 transitions. [2021-05-06 03:30:20,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:30:20,654 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-06 03:30:20,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:20,656 INFO L225 Difference]: With dead ends: 76 [2021-05-06 03:30:20,657 INFO L226 Difference]: Without dead ends: 64 [2021-05-06 03:30:20,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:20,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-06 03:30:20,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-06 03:30:20,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 41 states have internal predecessors, (48), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 03:30:20,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 76 transitions. [2021-05-06 03:30:20,672 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 76 transitions. Word has length 30 [2021-05-06 03:30:20,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:20,672 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 76 transitions. [2021-05-06 03:30:20,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 03:30:20,672 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 76 transitions. [2021-05-06 03:30:20,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 03:30:20,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:20,678 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 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 03:30:20,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:20,893 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:20,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:20,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1255015940, now seen corresponding path program 1 times [2021-05-06 03:30:20,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:20,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081650268] [2021-05-06 03:30:20,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:20,899 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:20,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2012290671] [2021-05-06 03:30:20,899 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 03:30:20,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:20,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:30:20,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:20,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:20,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-05-06 03:30:21,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:21,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081650268] [2021-05-06 03:30:21,016 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:21,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012290671] [2021-05-06 03:30:21,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012290671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:21,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:21,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 03:30:21,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015564870] [2021-05-06 03:30:21,016 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:30:21,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:21,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:30:21,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:30:21,017 INFO L87 Difference]: Start difference. First operand 63 states and 76 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, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:30:21,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:21,045 INFO L93 Difference]: Finished difference Result 90 states and 114 transitions. [2021-05-06 03:30:21,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:30:21,046 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, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 37 [2021-05-06 03:30:21,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:21,047 INFO L225 Difference]: With dead ends: 90 [2021-05-06 03:30:21,048 INFO L226 Difference]: Without dead ends: 65 [2021-05-06 03:30:21,048 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:21,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-06 03:30:21,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-06 03:30:21,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 41 states have (on average 1.2195121951219512) internal successors, (50), 43 states have internal predecessors, (50), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 03:30:21,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 78 transitions. [2021-05-06 03:30:21,053 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 78 transitions. Word has length 37 [2021-05-06 03:30:21,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:21,053 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 78 transitions. [2021-05-06 03:30:21,053 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, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:30:21,053 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 78 transitions. [2021-05-06 03:30:21,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-06 03:30:21,054 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:21,054 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:21,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:21,273 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:21,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:21,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1057559728, now seen corresponding path program 1 times [2021-05-06 03:30:21,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:21,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356090874] [2021-05-06 03:30:21,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:21,279 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:21,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [326481495] [2021-05-06 03:30:21,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:30:21,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:21,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:30:21,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:21,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,415 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 03:30:21,415 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:21,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356090874] [2021-05-06 03:30:21,416 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:21,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326481495] [2021-05-06 03:30:21,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326481495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:21,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:21,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:30:21,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622368013] [2021-05-06 03:30:21,416 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:21,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:21,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:21,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:21,417 INFO L87 Difference]: Start difference. First operand 65 states and 78 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 03:30:21,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:21,492 INFO L93 Difference]: Finished difference Result 119 states and 162 transitions. [2021-05-06 03:30:21,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:30:21,493 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 40 [2021-05-06 03:30:21,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:21,494 INFO L225 Difference]: With dead ends: 119 [2021-05-06 03:30:21,494 INFO L226 Difference]: Without dead ends: 87 [2021-05-06 03:30:21,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:21,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-06 03:30:21,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2021-05-06 03:30:21,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 55 states have internal predecessors, (64), 23 states have call successors, (23), 10 states have call predecessors, (23), 9 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:30:21,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 107 transitions. [2021-05-06 03:30:21,500 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 107 transitions. Word has length 40 [2021-05-06 03:30:21,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:21,500 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 107 transitions. [2021-05-06 03:30:21,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-06 03:30:21,500 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 107 transitions. [2021-05-06 03:30:21,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-06 03:30:21,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:21,501 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:21,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:21,717 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:21,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:21,717 INFO L82 PathProgramCache]: Analyzing trace with hash 529029787, now seen corresponding path program 1 times [2021-05-06 03:30:21,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:21,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724225341] [2021-05-06 03:30:21,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:21,722 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:21,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1765597062] [2021-05-06 03:30:21,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:30:21,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:21,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:30:21,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:21,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:21,882 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 36 proven. 42 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 03:30:21,882 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:21,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724225341] [2021-05-06 03:30:21,882 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:21,882 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1765597062] [2021-05-06 03:30:21,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1765597062] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:21,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:21,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:30:21,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914619699] [2021-05-06 03:30:21,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:21,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:21,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:21,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:21,883 INFO L87 Difference]: Start difference. First operand 85 states and 107 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 03:30:21,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:21,925 INFO L93 Difference]: Finished difference Result 110 states and 128 transitions. [2021-05-06 03:30:21,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:30:21,926 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 53 [2021-05-06 03:30:21,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:21,928 INFO L225 Difference]: With dead ends: 110 [2021-05-06 03:30:21,928 INFO L226 Difference]: Without dead ends: 98 [2021-05-06 03:30:21,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 9.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:21,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-06 03:30:21,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-06 03:30:21,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 61 states have (on average 1.180327868852459) internal successors, (72), 64 states have internal predecessors, (72), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:30:21,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 115 transitions. [2021-05-06 03:30:21,938 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 115 transitions. Word has length 53 [2021-05-06 03:30:21,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:21,938 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 115 transitions. [2021-05-06 03:30:21,938 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 03:30:21,938 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 115 transitions. [2021-05-06 03:30:21,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-06 03:30:21,940 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:21,940 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:22,144 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:22,145 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:22,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:22,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1864650262, now seen corresponding path program 2 times [2021-05-06 03:30:22,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:22,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825519115] [2021-05-06 03:30:22,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:22,151 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:22,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443018742] [2021-05-06 03:30:22,151 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:22,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:30:22,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:22,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:30:22,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:22,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,312 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-06 03:30:22,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:22,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825519115] [2021-05-06 03:30:22,313 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:22,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443018742] [2021-05-06 03:30:22,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443018742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:22,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:22,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:30:22,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803173478] [2021-05-06 03:30:22,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:22,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:22,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:22,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:22,314 INFO L87 Difference]: Start difference. First operand 97 states and 115 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, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 03:30:22,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:22,351 INFO L93 Difference]: Finished difference Result 124 states and 153 transitions. [2021-05-06 03:30:22,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:30:22,351 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, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 55 [2021-05-06 03:30:22,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:22,352 INFO L225 Difference]: With dead ends: 124 [2021-05-06 03:30:22,352 INFO L226 Difference]: Without dead ends: 99 [2021-05-06 03:30:22,352 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:22,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-06 03:30:22,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-06 03:30:22,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 63 states have (on average 1.1746031746031746) internal successors, (74), 66 states have internal predecessors, (74), 23 states have call successors, (23), 13 states have call predecessors, (23), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-06 03:30:22,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 117 transitions. [2021-05-06 03:30:22,357 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 117 transitions. Word has length 55 [2021-05-06 03:30:22,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:22,357 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 117 transitions. [2021-05-06 03:30:22,358 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, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-06 03:30:22,358 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 117 transitions. [2021-05-06 03:30:22,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-06 03:30:22,358 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:22,358 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:22,575 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:22,575 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:22,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:22,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1879054090, now seen corresponding path program 2 times [2021-05-06 03:30:22,576 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:22,576 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234969083] [2021-05-06 03:30:22,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:22,586 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:22,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [416725460] [2021-05-06 03:30:22,586 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 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 03:30:22,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:30:22,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:22,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-06 03:30:22,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:22,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:22,740 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 16 proven. 16 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 03:30:22,740 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:22,740 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234969083] [2021-05-06 03:30:22,740 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:22,740 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416725460] [2021-05-06 03:30:22,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416725460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:22,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:22,741 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:30:22,741 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102301195] [2021-05-06 03:30:22,741 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:30:22,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:22,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:30:22,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:22,741 INFO L87 Difference]: Start difference. First operand 99 states and 117 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:22,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:22,860 INFO L93 Difference]: Finished difference Result 168 states and 228 transitions. [2021-05-06 03:30:22,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:30:22,861 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 58 [2021-05-06 03:30:22,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:22,862 INFO L225 Difference]: With dead ends: 168 [2021-05-06 03:30:22,862 INFO L226 Difference]: Without dead ends: 136 [2021-05-06 03:30:22,862 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.7ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:22,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-06 03:30:22,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-05-06 03:30:22,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 81 states have (on average 1.2222222222222223) internal successors, (99), 85 states have internal predecessors, (99), 34 states have call successors, (34), 14 states have call predecessors, (34), 13 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:30:22,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 164 transitions. [2021-05-06 03:30:22,869 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 164 transitions. Word has length 58 [2021-05-06 03:30:22,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:22,869 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 164 transitions. [2021-05-06 03:30:22,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 4 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:22,869 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 164 transitions. [2021-05-06 03:30:22,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 03:30:22,870 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:22,870 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 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 03:30:23,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-06 03:30:23,085 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:23,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:23,085 INFO L82 PathProgramCache]: Analyzing trace with hash -43330764, now seen corresponding path program 1 times [2021-05-06 03:30:23,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:23,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1722367805] [2021-05-06 03:30:23,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:23,103 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:23,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [882261026] [2021-05-06 03:30:23,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:23,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:23,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 03:30:23,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:23,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,261 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-06 03:30:23,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:23,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1722367805] [2021-05-06 03:30:23,262 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:23,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882261026] [2021-05-06 03:30:23,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882261026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:23,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:23,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:30:23,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579688730] [2021-05-06 03:30:23,264 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:30:23,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:23,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:30:23,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:23,265 INFO L87 Difference]: Start difference. First operand 129 states and 164 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:23,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:23,318 INFO L93 Difference]: Finished difference Result 163 states and 192 transitions. [2021-05-06 03:30:23,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:30:23,318 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 62 [2021-05-06 03:30:23,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:23,320 INFO L225 Difference]: With dead ends: 163 [2021-05-06 03:30:23,320 INFO L226 Difference]: Without dead ends: 150 [2021-05-06 03:30:23,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 17.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:23,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-06 03:30:23,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-06 03:30:23,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 96 states have (on average 1.1666666666666667) internal successors, (112), 100 states have internal predecessors, (112), 34 states have call successors, (34), 19 states have call predecessors, (34), 18 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:30:23,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2021-05-06 03:30:23,332 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 62 [2021-05-06 03:30:23,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:23,332 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2021-05-06 03:30:23,332 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (11), 6 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:23,332 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2021-05-06 03:30:23,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-06 03:30:23,332 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:23,332 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:23,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:23,549 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:23,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:23,549 INFO L82 PathProgramCache]: Analyzing trace with hash -41602886, now seen corresponding path program 1 times [2021-05-06 03:30:23,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:23,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565077551] [2021-05-06 03:30:23,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:23,555 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:23,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1229651291] [2021-05-06 03:30:23,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:23,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:23,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-06 03:30:23,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:23,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:23,729 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-06 03:30:23,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:23,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565077551] [2021-05-06 03:30:23,729 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:23,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229651291] [2021-05-06 03:30:23,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229651291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:23,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:23,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:30:23,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454851149] [2021-05-06 03:30:23,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:30:23,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:23,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:30:23,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:23,730 INFO L87 Difference]: Start difference. First operand 149 states and 177 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 03:30:23,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:23,803 INFO L93 Difference]: Finished difference Result 157 states and 184 transitions. [2021-05-06 03:30:23,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:30:23,803 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-06 03:30:23,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:23,804 INFO L225 Difference]: With dead ends: 157 [2021-05-06 03:30:23,804 INFO L226 Difference]: Without dead ends: 155 [2021-05-06 03:30:23,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.6ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:23,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-06 03:30:23,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 153. [2021-05-06 03:30:23,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1616161616161615) internal successors, (115), 103 states have internal predecessors, (115), 34 states have call successors, (34), 20 states have call predecessors, (34), 19 states have return successors, (31), 29 states have call predecessors, (31), 31 states have call successors, (31) [2021-05-06 03:30:23,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 180 transitions. [2021-05-06 03:30:23,811 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 180 transitions. Word has length 62 [2021-05-06 03:30:23,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:23,811 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 180 transitions. [2021-05-06 03:30:23,811 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, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-06 03:30:23,811 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 180 transitions. [2021-05-06 03:30:23,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 03:30:23,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:23,812 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:24,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:24,041 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:24,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:24,042 INFO L82 PathProgramCache]: Analyzing trace with hash 73149133, now seen corresponding path program 1 times [2021-05-06 03:30:24,042 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:24,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1814008389] [2021-05-06 03:30:24,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:24,050 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:24,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1084125526] [2021-05-06 03:30:24,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:24,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:24,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-06 03:30:24,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:24,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,251 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 11 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-05-06 03:30:24,251 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:24,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1814008389] [2021-05-06 03:30:24,251 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:24,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084125526] [2021-05-06 03:30:24,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084125526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:24,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:24,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:30:24,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636562852] [2021-05-06 03:30:24,252 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:30:24,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:24,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:30:24,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:24,252 INFO L87 Difference]: Start difference. First operand 153 states and 180 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 03:30:24,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:24,324 INFO L93 Difference]: Finished difference Result 161 states and 187 transitions. [2021-05-06 03:30:24,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:30:24,324 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 73 [2021-05-06 03:30:24,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:24,325 INFO L225 Difference]: With dead ends: 161 [2021-05-06 03:30:24,325 INFO L226 Difference]: Without dead ends: 127 [2021-05-06 03:30:24,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 47.0ms TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:30:24,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-06 03:30:24,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-06 03:30:24,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 81 states have (on average 1.1851851851851851) internal successors, (96), 84 states have internal predecessors, (96), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 03:30:24,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 153 transitions. [2021-05-06 03:30:24,330 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 153 transitions. Word has length 73 [2021-05-06 03:30:24,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:24,331 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 153 transitions. [2021-05-06 03:30:24,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-06 03:30:24,331 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 153 transitions. [2021-05-06 03:30:24,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-06 03:30:24,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:24,331 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:24,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-06 03:30:24,550 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:24,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:24,551 INFO L82 PathProgramCache]: Analyzing trace with hash 469209008, now seen corresponding path program 3 times [2021-05-06 03:30:24,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:24,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209297383] [2021-05-06 03:30:24,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:24,555 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:24,556 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [19899617] [2021-05-06 03:30:24,556 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:24,604 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:30:24,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:24,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 03:30:24,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:24,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:24,706 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 54 proven. 132 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-05-06 03:30:24,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:24,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209297383] [2021-05-06 03:30:24,706 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:24,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19899617] [2021-05-06 03:30:24,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19899617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:24,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:24,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 03:30:24,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838848461] [2021-05-06 03:30:24,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 03:30:24,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:24,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 03:30:24,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:24,707 INFO L87 Difference]: Start difference. First operand 127 states and 153 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 03:30:24,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:24,761 INFO L93 Difference]: Finished difference Result 154 states and 191 transitions. [2021-05-06 03:30:24,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:30:24,761 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2021-05-06 03:30:24,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:24,762 INFO L225 Difference]: With dead ends: 154 [2021-05-06 03:30:24,762 INFO L226 Difference]: Without dead ends: 129 [2021-05-06 03:30:24,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 24.1ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:30:24,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-05-06 03:30:24,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-05-06 03:30:24,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 83 states have (on average 1.180722891566265) internal successors, (98), 86 states have internal predecessors, (98), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (27), 26 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-06 03:30:24,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 155 transitions. [2021-05-06 03:30:24,767 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 155 transitions. Word has length 73 [2021-05-06 03:30:24,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:24,767 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 155 transitions. [2021-05-06 03:30:24,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 6 states have call successors, (13), 6 states have call predecessors, (13), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-06 03:30:24,768 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 155 transitions. [2021-05-06 03:30:24,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-06 03:30:24,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:24,768 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:24,985 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-06 03:30:24,985 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:24,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:24,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1813973276, now seen corresponding path program 3 times [2021-05-06 03:30:24,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:24,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341477422] [2021-05-06 03:30:24,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:24,990 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:24,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2083353194] [2021-05-06 03:30:24,990 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:25,036 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 03:30:25,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:25,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-06 03:30:25,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:25,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,231 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 72 proven. 7 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-06 03:30:25,231 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:25,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341477422] [2021-05-06 03:30:25,231 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:25,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083353194] [2021-05-06 03:30:25,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083353194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:25,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:25,232 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 03:30:25,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554956904] [2021-05-06 03:30:25,233 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 03:30:25,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:25,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 03:30:25,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:30:25,234 INFO L87 Difference]: Start difference. First operand 129 states and 155 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:25,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:25,387 INFO L93 Difference]: Finished difference Result 171 states and 212 transitions. [2021-05-06 03:30:25,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:30:25,388 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 76 [2021-05-06 03:30:25,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:25,389 INFO L225 Difference]: With dead ends: 171 [2021-05-06 03:30:25,389 INFO L226 Difference]: Without dead ends: 158 [2021-05-06 03:30:25,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 60.5ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-06 03:30:25,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-06 03:30:25,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 153. [2021-05-06 03:30:25,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 99 states have (on average 1.1919191919191918) internal successors, (118), 102 states have internal predecessors, (118), 36 states have call successors, (36), 18 states have call predecessors, (36), 17 states have return successors, (33), 32 states have call predecessors, (33), 33 states have call successors, (33) [2021-05-06 03:30:25,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 187 transitions. [2021-05-06 03:30:25,397 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 187 transitions. Word has length 76 [2021-05-06 03:30:25,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:25,398 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 187 transitions. [2021-05-06 03:30:25,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-06 03:30:25,398 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 187 transitions. [2021-05-06 03:30:25,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 03:30:25,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:25,398 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:25,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-06 03:30:25,613 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:25,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:25,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1997631578, now seen corresponding path program 2 times [2021-05-06 03:30:25,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:25,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639453252] [2021-05-06 03:30:25,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:25,619 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:25,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1448602315] [2021-05-06 03:30:25,619 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:25,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:30:25,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:25,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:30:25,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:25,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,683 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:25,787 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 22 proven. 200 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 03:30:25,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:25,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639453252] [2021-05-06 03:30:25,787 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:25,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448602315] [2021-05-06 03:30:25,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448602315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:25,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:25,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:30:25,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430734704] [2021-05-06 03:30:25,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:30:25,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:25,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:30:25,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:25,788 INFO L87 Difference]: Start difference. First operand 153 states and 187 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 03:30:25,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:25,851 INFO L93 Difference]: Finished difference Result 193 states and 227 transitions. [2021-05-06 03:30:25,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 03:30:25,852 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 80 [2021-05-06 03:30:25,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:25,852 INFO L225 Difference]: With dead ends: 193 [2021-05-06 03:30:25,852 INFO L226 Difference]: Without dead ends: 180 [2021-05-06 03:30:25,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 21.4ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:30:25,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-06 03:30:25,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-05-06 03:30:25,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 117 states have (on average 1.1538461538461537) internal successors, (135), 120 states have internal predecessors, (135), 39 states have call successors, (39), 23 states have call predecessors, (39), 22 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 03:30:25,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 210 transitions. [2021-05-06 03:30:25,861 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 210 transitions. Word has length 80 [2021-05-06 03:30:25,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:25,861 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 210 transitions. [2021-05-06 03:30:25,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 7 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-06 03:30:25,862 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 210 transitions. [2021-05-06 03:30:25,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-06 03:30:25,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:25,862 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 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 03:30:26,080 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:26,081 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:26,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:26,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1999359456, now seen corresponding path program 2 times [2021-05-06 03:30:26,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:26,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078018820] [2021-05-06 03:30:26,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:26,086 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:26,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1020405287] [2021-05-06 03:30:26,086 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:26,137 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 03:30:26,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:26,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-06 03:30:26,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:26,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,306 INFO L134 CoverageAnalysis]: Checked inductivity of 263 backedges. 22 proven. 21 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-06 03:30:26,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:26,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078018820] [2021-05-06 03:30:26,306 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:26,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020405287] [2021-05-06 03:30:26,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020405287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:26,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:26,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:30:26,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14999631] [2021-05-06 03:30:26,307 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:30:26,307 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:26,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:30:26,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:26,307 INFO L87 Difference]: Start difference. First operand 179 states and 210 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 03:30:26,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:26,431 INFO L93 Difference]: Finished difference Result 199 states and 230 transitions. [2021-05-06 03:30:26,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:30:26,431 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 80 [2021-05-06 03:30:26,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:26,432 INFO L225 Difference]: With dead ends: 199 [2021-05-06 03:30:26,432 INFO L226 Difference]: Without dead ends: 197 [2021-05-06 03:30:26,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.2ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:30:26,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-06 03:30:26,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 194. [2021-05-06 03:30:26,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 128 states have (on average 1.1484375) internal successors, (147), 132 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 03:30:26,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 224 transitions. [2021-05-06 03:30:26,441 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 224 transitions. Word has length 80 [2021-05-06 03:30:26,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:26,442 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 224 transitions. [2021-05-06 03:30:26,442 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 5 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-06 03:30:26,442 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 224 transitions. [2021-05-06 03:30:26,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-06 03:30:26,442 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:26,442 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:26,656 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:26,657 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:26,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:26,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1432051402, now seen corresponding path program 4 times [2021-05-06 03:30:26,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:26,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144478258] [2021-05-06 03:30:26,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:26,662 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:26,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1513983924] [2021-05-06 03:30:26,662 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:26,715 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 03:30:26,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:26,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-06 03:30:26,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:26,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:26,827 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 72 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-05-06 03:30:26,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:26,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144478258] [2021-05-06 03:30:26,828 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:26,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513983924] [2021-05-06 03:30:26,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513983924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:26,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:26,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-06 03:30:26,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018602721] [2021-05-06 03:30:26,828 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 03:30:26,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:26,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 03:30:26,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:30:26,829 INFO L87 Difference]: Start difference. First operand 194 states and 224 transitions. Second operand has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:26,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:26,905 INFO L93 Difference]: Finished difference Result 241 states and 291 transitions. [2021-05-06 03:30:26,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 03:30:26,905 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 91 [2021-05-06 03:30:26,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:26,907 INFO L225 Difference]: With dead ends: 241 [2021-05-06 03:30:26,907 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 03:30:26,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 34.0ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-06 03:30:26,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 03:30:26,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 03:30:26,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.146153846153846) internal successors, (149), 134 states have internal predecessors, (149), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (37), 35 states have call predecessors, (37), 37 states have call successors, (37) [2021-05-06 03:30:26,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 226 transitions. [2021-05-06 03:30:26,915 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 226 transitions. Word has length 91 [2021-05-06 03:30:26,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:26,915 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 226 transitions. [2021-05-06 03:30:26,915 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.5) internal successors, (36), 7 states have internal predecessors, (36), 7 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:26,916 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 226 transitions. [2021-05-06 03:30:26,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:30:26,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:26,916 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:27,133 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:27,133 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:27,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:27,133 INFO L82 PathProgramCache]: Analyzing trace with hash -614243194, now seen corresponding path program 3 times [2021-05-06 03:30:27,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:27,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975814537] [2021-05-06 03:30:27,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:27,165 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:27,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1362219428] [2021-05-06 03:30:27,166 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:27,227 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:30:27,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:27,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-06 03:30:27,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:27,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:27,474 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 60 proven. 60 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-05-06 03:30:27,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:27,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975814537] [2021-05-06 03:30:27,474 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:27,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362219428] [2021-05-06 03:30:27,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362219428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:27,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:27,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-06 03:30:27,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407877560] [2021-05-06 03:30:27,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-06 03:30:27,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:27,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-06 03:30:27,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-06 03:30:27,475 INFO L87 Difference]: Start difference. First operand 196 states and 226 transitions. Second operand has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:27,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:27,739 INFO L93 Difference]: Finished difference Result 215 states and 247 transitions. [2021-05-06 03:30:27,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-06 03:30:27,739 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) Word has length 94 [2021-05-06 03:30:27,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:27,740 INFO L225 Difference]: With dead ends: 215 [2021-05-06 03:30:27,740 INFO L226 Difference]: Without dead ends: 196 [2021-05-06 03:30:27,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 81 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 131.0ms TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-06 03:30:27,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-06 03:30:27,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 196. [2021-05-06 03:30:27,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 130 states have (on average 1.1307692307692307) internal successors, (147), 134 states have internal predecessors, (147), 40 states have call successors, (40), 26 states have call predecessors, (40), 25 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-05-06 03:30:27,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 223 transitions. [2021-05-06 03:30:27,749 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 223 transitions. Word has length 94 [2021-05-06 03:30:27,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:27,749 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 223 transitions. [2021-05-06 03:30:27,749 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3846153846153846) internal successors, (31), 11 states have internal predecessors, (31), 7 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 5 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:27,749 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 223 transitions. [2021-05-06 03:30:27,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:30:27,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:27,750 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:27,950 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-06 03:30:27,950 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:27,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:27,951 INFO L82 PathProgramCache]: Analyzing trace with hash -612515316, now seen corresponding path program 3 times [2021-05-06 03:30:27,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:27,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480264615] [2021-05-06 03:30:27,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:27,957 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:27,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1879079795] [2021-05-06 03:30:27,957 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:28,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-06 03:30:28,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:28,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-06 03:30:28,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:28,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,253 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 26 proven. 30 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-05-06 03:30:28,253 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:28,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480264615] [2021-05-06 03:30:28,253 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:28,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879079795] [2021-05-06 03:30:28,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879079795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:28,253 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:28,253 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 03:30:28,253 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810616365] [2021-05-06 03:30:28,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 03:30:28,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:28,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 03:30:28,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:30:28,254 INFO L87 Difference]: Start difference. First operand 196 states and 223 transitions. Second operand has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:30:28,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:28,391 INFO L93 Difference]: Finished difference Result 202 states and 228 transitions. [2021-05-06 03:30:28,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 03:30:28,391 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 03:30:28,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:28,392 INFO L225 Difference]: With dead ends: 202 [2021-05-06 03:30:28,392 INFO L226 Difference]: Without dead ends: 179 [2021-05-06 03:30:28,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 80.8ms TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-06 03:30:28,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-06 03:30:28,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 179. [2021-05-06 03:30:28,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 118 states have (on average 1.1355932203389831) internal successors, (134), 121 states have internal predecessors, (134), 37 states have call successors, (37), 24 states have call predecessors, (37), 23 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-06 03:30:28,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 205 transitions. [2021-05-06 03:30:28,401 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 205 transitions. Word has length 94 [2021-05-06 03:30:28,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:28,401 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 205 transitions. [2021-05-06 03:30:28,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.8) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:30:28,401 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 205 transitions. [2021-05-06 03:30:28,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:30:28,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:28,402 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:28,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-06 03:30:28,621 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:28,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:28,622 INFO L82 PathProgramCache]: Analyzing trace with hash -191541368, now seen corresponding path program 1 times [2021-05-06 03:30:28,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:28,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973254899] [2021-05-06 03:30:28,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:28,627 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:28,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [62391706] [2021-05-06 03:30:28,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:28,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:28,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 03:30:28,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:28,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,783 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:28,832 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 26 proven. 296 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-05-06 03:30:28,832 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:28,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973254899] [2021-05-06 03:30:28,832 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:28,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62391706] [2021-05-06 03:30:28,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62391706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:30:28,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:30:28,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 03:30:28,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418050706] [2021-05-06 03:30:28,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 03:30:28,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:28,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 03:30:28,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-06 03:30:28,833 INFO L87 Difference]: Start difference. First operand 179 states and 205 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:28,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:28,932 INFO L93 Difference]: Finished difference Result 224 states and 256 transitions. [2021-05-06 03:30:28,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 03:30:28,932 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) Word has length 94 [2021-05-06 03:30:28,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:28,933 INFO L225 Difference]: With dead ends: 224 [2021-05-06 03:30:28,933 INFO L226 Difference]: Without dead ends: 210 [2021-05-06 03:30:28,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 33.6ms TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-05-06 03:30:28,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-06 03:30:28,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 209. [2021-05-06 03:30:28,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 139 states have (on average 1.1223021582733812) internal successors, (156), 142 states have internal predecessors, (156), 42 states have call successors, (42), 28 states have call predecessors, (42), 27 states have return successors, (39), 38 states have call predecessors, (39), 39 states have call successors, (39) [2021-05-06 03:30:28,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 237 transitions. [2021-05-06 03:30:28,942 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 237 transitions. Word has length 94 [2021-05-06 03:30:28,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:28,943 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 237 transitions. [2021-05-06 03:30:28,943 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 8 states have call successors, (16), 8 states have call predecessors, (16), 6 states have return successors, (14), 6 states have call predecessors, (14), 6 states have call successors, (14) [2021-05-06 03:30:28,943 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 237 transitions. [2021-05-06 03:30:28,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-06 03:30:28,944 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:28,944 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:29,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-06 03:30:29,157 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:29,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:29,157 INFO L82 PathProgramCache]: Analyzing trace with hash -189813490, now seen corresponding path program 1 times [2021-05-06 03:30:29,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:29,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492362081] [2021-05-06 03:30:29,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:29,162 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:29,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1342637412] [2021-05-06 03:30:29,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:29,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:30:29,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-06 03:30:29,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:29,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:29,401 INFO L134 CoverageAnalysis]: Checked inductivity of 368 backedges. 137 proven. 0 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-06 03:30:29,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:30:29,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492362081] [2021-05-06 03:30:29,401 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:30:29,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342637412] [2021-05-06 03:30:29,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342637412] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:30:29,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:30:29,401 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:30:29,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804511791] [2021-05-06 03:30:29,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:30:29,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:30:29,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:30:29,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:30:29,402 INFO L87 Difference]: Start difference. First operand 209 states and 237 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:30:29,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:30:29,473 INFO L93 Difference]: Finished difference Result 243 states and 282 transitions. [2021-05-06 03:30:29,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:30:29,474 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 94 [2021-05-06 03:30:29,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:30:29,475 INFO L225 Difference]: With dead ends: 243 [2021-05-06 03:30:29,475 INFO L226 Difference]: Without dead ends: 169 [2021-05-06 03:30:29,475 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 27.1ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:30:29,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-06 03:30:29,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 158. [2021-05-06 03:30:29,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 104 states have (on average 1.0961538461538463) internal successors, (114), 106 states have internal predecessors, (114), 31 states have call successors, (31), 23 states have call predecessors, (31), 22 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-05-06 03:30:29,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 174 transitions. [2021-05-06 03:30:29,482 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 174 transitions. Word has length 94 [2021-05-06 03:30:29,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:30:29,482 INFO L480 AbstractCegarLoop]: Abstraction has 158 states and 174 transitions. [2021-05-06 03:30:29,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-06 03:30:29,483 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 174 transitions. [2021-05-06 03:30:29,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-06 03:30:29,484 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:30:29,484 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:30:29,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-06 03:30:29,701 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:30:29,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:30:29,701 INFO L82 PathProgramCache]: Analyzing trace with hash 412069254, now seen corresponding path program 4 times [2021-05-06 03:30:29,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:30:29,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702903195] [2021-05-06 03:30:29,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:30:29,712 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:30:29,712 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1556291547] [2021-05-06 03:30:29,712 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:30:29,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-06 03:30:29,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 03:30:29,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-06 03:30:29,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:30:38,076 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:38,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:38,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:38,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:45,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:30:45,369 WARN L159 QuantifierPusher]: Ignoring assumption.