/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/loop-acceleration/phases_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:18:49,896 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:18:49,898 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:18:49,922 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:18:49,928 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:18:49,928 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:18:49,929 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:18:49,930 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:18:49,930 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:18:49,931 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:18:49,932 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:18:49,933 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:18:49,934 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:18:49,939 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:18:49,941 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:18:49,942 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:18:49,946 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:18:49,951 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:18:49,951 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:18:49,952 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:18:49,965 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 12:18:49,985 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:18:49,985 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:18:49,987 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:18:49,987 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:18:49,987 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:18:49,987 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:18:49,988 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:18:49,988 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:18:49,988 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:18:49,988 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:18:49,988 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:18:49,989 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:18:49,989 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:18:49,990 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:18:49,990 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:18:50,226 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:18:50,247 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:18:50,249 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:18:50,250 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:18:50,250 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:18:50,251 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-02 12:18:50,299 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/751df73e8/a68fce78e9494015a70431b72711bac2/FLAGbfce1580b [2021-05-02 12:18:50,648 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:18:50,648 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c [2021-05-02 12:18:50,658 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/751df73e8/a68fce78e9494015a70431b72711bac2/FLAGbfce1580b [2021-05-02 12:18:50,672 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/751df73e8/a68fce78e9494015a70431b72711bac2 [2021-05-02 12:18:50,675 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:18:50,676 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:18:50,678 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:18:50,678 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:18:50,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:18:50,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,681 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@44feb3e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50, skipping insertion in model container [2021-05-02 12:18:50,682 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,686 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:18:50,695 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:18:50,808 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-02 12:18:50,822 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:18:50,829 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:18:50,846 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_1-1.c[322,335] [2021-05-02 12:18:50,855 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:18:50,875 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:18:50,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50 WrapperNode [2021-05-02 12:18:50,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:18:50,877 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:18:50,877 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:18:50,878 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:18:50,884 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,885 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,888 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,889 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,897 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,901 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,902 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... [2021-05-02 12:18:50,904 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:18:50,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:18:50,905 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:18:50,905 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:18:50,906 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:18:50,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:18:50,973 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:18:50,973 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:18:50,973 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:18:50,974 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:18:50,974 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:18:50,975 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:18:50,975 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:18:50,975 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:18:50,976 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:18:50,976 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:18:50,976 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:18:51,188 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:18:51,188 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 12:18:51,193 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:18:51 BoogieIcfgContainer [2021-05-02 12:18:51,193 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:18:51,194 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:18:51,194 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:18:51,196 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:18:51,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:18:50" (1/3) ... [2021-05-02 12:18:51,196 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139b32ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:18:51, skipping insertion in model container [2021-05-02 12:18:51,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:18:50" (2/3) ... [2021-05-02 12:18:51,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@139b32ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:18:51, skipping insertion in model container [2021-05-02 12:18:51,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:18:51" (3/3) ... [2021-05-02 12:18:51,197 INFO L111 eAbstractionObserver]: Analyzing ICFG phases_1-1.c [2021-05-02 12:18:51,201 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:18:51,203 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:18:51,216 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:18:51,230 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:18:51,230 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:18:51,230 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:18:51,230 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:18:51,230 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:18:51,230 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:18:51,230 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:18:51,230 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:18:51,241 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 12:18:51,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:18:51,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:51,244 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:51,244 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:51,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:51,247 INFO L82 PathProgramCache]: Analyzing trace with hash 491760044, now seen corresponding path program 1 times [2021-05-02 12:18:51,252 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:51,252 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563933197] [2021-05-02 12:18:51,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:51,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:51,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:51,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:51,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563933197] [2021-05-02 12:18:51,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563933197] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:51,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:18:51,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:18:51,369 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389672511] [2021-05-02 12:18:51,371 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:18:51,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:51,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:18:51,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:18:51,381 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:51,410 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2021-05-02 12:18:51,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:18:51,411 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:18:51,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:51,415 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:18:51,415 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 12:18:51,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:18:51,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 12:18:51,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 12:18:51,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 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) [2021-05-02 12:18:51,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 12:18:51,438 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 12:18:51,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:51,439 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 12:18:51,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,439 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 12:18:51,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:18:51,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:51,439 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:51,440 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:18:51,440 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:51,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:51,440 INFO L82 PathProgramCache]: Analyzing trace with hash 482524834, now seen corresponding path program 1 times [2021-05-02 12:18:51,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:51,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094693511] [2021-05-02 12:18:51,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:51,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:51,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,550 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:51,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:51,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094693511] [2021-05-02 12:18:51,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094693511] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:51,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:18:51,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:18:51,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334536193] [2021-05-02 12:18:51,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:18:51,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:51,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:18:51,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:18:51,553 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:51,633 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-02 12:18:51,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:18:51,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 12:18:51,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:51,634 INFO L225 Difference]: With dead ends: 22 [2021-05-02 12:18:51,634 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 12:18:51,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:18:51,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 12:18:51,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 12:18:51,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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) [2021-05-02 12:18:51,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 12:18:51,638 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 12:18:51,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:51,639 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 12:18:51,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,639 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 12:18:51,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 12:18:51,639 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:51,639 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:51,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:18:51,640 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:51,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:51,640 INFO L82 PathProgramCache]: Analyzing trace with hash 925229631, now seen corresponding path program 1 times [2021-05-02 12:18:51,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:51,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523725273] [2021-05-02 12:18:51,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:51,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:51,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:51,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:51,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523725273] [2021-05-02 12:18:51,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523725273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:51,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1535610567] [2021-05-02 12:18:51,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:51,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:51,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:18:51,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:51,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:51,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1535610567] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:51,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:51,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:18:51,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950505445] [2021-05-02 12:18:51,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:18:51,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:51,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:18:51,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:18:51,855 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:51,957 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-05-02 12:18:51,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:18:51,958 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 12:18:51,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:51,958 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:18:51,959 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:18:51,959 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 98.3ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:51,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:18:51,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:18:51,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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) [2021-05-02 12:18:51,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 12:18:51,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 12:18:51,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:51,968 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 12:18:51,968 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:51,968 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 12:18:51,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:18:51,969 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:51,969 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:52,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:18:52,177 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:52,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:52,177 INFO L82 PathProgramCache]: Analyzing trace with hash 1162777244, now seen corresponding path program 2 times [2021-05-02 12:18:52,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:52,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882056681] [2021-05-02 12:18:52,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:52,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:52,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:52,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:52,258 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:52,259 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:52,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882056681] [2021-05-02 12:18:52,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882056681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:52,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979182618] [2021-05-02 12:18:52,259 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 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:52,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:18:52,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:52,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:18:52,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:52,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:52,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:52,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979182618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:52,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:52,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:18:52,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151040841] [2021-05-02 12:18:52,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:18:52,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:52,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:18:52,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:18:52,375 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:52,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:52,513 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-02 12:18:52,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:18:52,513 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 12:18:52,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:52,515 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:18:52,515 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 12:18:52,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 142.0ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:18:52,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 12:18:52,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 12:18:52,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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) [2021-05-02 12:18:52,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 12:18:52,521 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 12:18:52,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:52,522 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 12:18:52,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:52,522 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 12:18:52,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 12:18:52,523 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:52,523 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:52,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:52,729 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:52,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:52,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1812766649, now seen corresponding path program 3 times [2021-05-02 12:18:52,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:52,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241972814] [2021-05-02 12:18:52,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:52,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:52,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:52,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:52,839 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:52,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:52,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241972814] [2021-05-02 12:18:52,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241972814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:52,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1549525009] [2021-05-02 12:18:52,840 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:52,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 12:18:52,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:52,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:18:52,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:52,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:52,963 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:18:52,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1549525009] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:18:52,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 12:18:52,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 12:18:52,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763665165] [2021-05-02 12:18:52,964 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:18:52,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:52,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:18:52,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:52,965 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:52,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:52,988 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 12:18:52,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:18:52,988 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 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 17 [2021-05-02 12:18:52,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:52,989 INFO L225 Difference]: With dead ends: 26 [2021-05-02 12:18:52,989 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:18:52,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 73.6ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:52,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:18:52,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 12:18:52,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 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) [2021-05-02 12:18:52,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 12:18:52,992 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 12:18:52,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:52,992 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 12:18:52,992 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:52,992 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 12:18:52,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 12:18:52,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:52,993 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:53,204 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:53,205 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:53,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:53,205 INFO L82 PathProgramCache]: Analyzing trace with hash -555382060, now seen corresponding path program 1 times [2021-05-02 12:18:53,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:53,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404658754] [2021-05-02 12:18:53,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:53,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:53,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,278 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,278 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:53,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404658754] [2021-05-02 12:18:53,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404658754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:53,279 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350367649] [2021-05-02 12:18:53,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:53,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:18:53,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:53,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:53,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:53,376 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350367649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:53,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:53,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:18:53,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749362943] [2021-05-02 12:18:53,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:18:53,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:53,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:18:53,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:18:53,377 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:53,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:53,527 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 12:18:53,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:18:53,527 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 12:18:53,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:53,527 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:18:53,528 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 12:18:53,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 142.8ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:18:53,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 12:18:53,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 12:18:53,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 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) [2021-05-02 12:18:53,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 12:18:53,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 12:18:53,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:53,531 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 12:18:53,531 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:53,531 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 12:18:53,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:18:53,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:53,532 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:53,738 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:53,741 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:53,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:53,742 INFO L82 PathProgramCache]: Analyzing trace with hash 795722097, now seen corresponding path program 2 times [2021-05-02 12:18:53,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:53,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509884887] [2021-05-02 12:18:53,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:53,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:53,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:53,826 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:53,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509884887] [2021-05-02 12:18:53,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509884887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:53,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572485814] [2021-05-02 12:18:53,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:53,864 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:18:53,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:53,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:18:53,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:53,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:53,928 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:53,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572485814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:53,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:53,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 12:18:53,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944235951] [2021-05-02 12:18:53,931 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:18:53,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:53,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:18:53,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:18:53,932 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:54,098 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 12:18:54,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:18:54,099 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 12:18:54,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:54,100 INFO L225 Difference]: With dead ends: 32 [2021-05-02 12:18:54,100 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 12:18:54,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 157.6ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:18:54,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 12:18:54,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 12:18:54,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 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) [2021-05-02 12:18:54,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 12:18:54,110 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 12:18:54,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:54,110 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 12:18:54,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,113 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 12:18:54,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 12:18:54,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:54,115 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:54,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:18:54,329 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:54,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:54,329 INFO L82 PathProgramCache]: Analyzing trace with hash 2126693582, now seen corresponding path program 3 times [2021-05-02 12:18:54,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:54,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836136552] [2021-05-02 12:18:54,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:54,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:54,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:54,425 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:54,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:54,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836136552] [2021-05-02 12:18:54,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836136552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [78673730] [2021-05-02 12:18:54,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:54,492 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:18:54,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:54,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:18:54,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:54,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:54,557 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 12:18:54,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [78673730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:54,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:54,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 12:18:54,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867862907] [2021-05-02 12:18:54,558 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:18:54,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:54,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:18:54,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:18:54,559 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:54,897 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-05-02 12:18:54,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:18:54,897 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 12:18:54,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:54,898 INFO L225 Difference]: With dead ends: 39 [2021-05-02 12:18:54,898 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 12:18:54,898 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 326.4ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:18:54,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 12:18:54,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 12:18:54,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 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) [2021-05-02 12:18:54,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 12:18:54,901 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 12:18:54,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:54,902 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 12:18:54,902 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:54,902 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 12:18:54,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 12:18:54,902 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:54,902 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:55,105 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,108 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:55,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:55,108 INFO L82 PathProgramCache]: Analyzing trace with hash -387921018, now seen corresponding path program 4 times [2021-05-02 12:18:55,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:55,108 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940276502] [2021-05-02 12:18:55,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:55,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:55,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,209 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:55,209 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:55,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940276502] [2021-05-02 12:18:55,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940276502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,209 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386935736] [2021-05-02 12:18:55,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:18:55,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:55,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:18:55,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:55,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:55,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:55,310 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:55,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386935736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:55,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:18:55,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [824910394] [2021-05-02 12:18:55,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:18:55,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:55,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:18:55,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:18:55,314 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:55,523 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-02 12:18:55,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:18:55,523 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 12:18:55,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:55,524 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:18:55,524 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 12:18:55,524 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 212.5ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:18:55,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 12:18:55,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 12:18:55,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 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) [2021-05-02 12:18:55,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 12:18:55,530 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 12:18:55,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:55,532 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 12:18:55,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:55,532 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 12:18:55,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:18:55,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:55,532 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:55,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:55,752 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:55,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:55,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1899293405, now seen corresponding path program 5 times [2021-05-02 12:18:55,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:55,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610987558] [2021-05-02 12:18:55,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:55,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:55,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:55,877 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:55,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:55,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610987558] [2021-05-02 12:18:55,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610987558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:55,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164366011] [2021-05-02 12:18:55,878 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_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 [2021-05-02 12:18:55,925 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 12:18:55,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:55,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:18:55,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:56,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:56,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:56,012 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:56,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [164366011] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:56,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:18:56,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122766318] [2021-05-02 12:18:56,013 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:18:56,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:56,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:18:56,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:18:56,014 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:56,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:56,277 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 12:18:56,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:18:56,278 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 12:18:56,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:56,278 INFO L225 Difference]: With dead ends: 42 [2021-05-02 12:18:56,278 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 12:18:56,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 282.3ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:18:56,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 12:18:56,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 12:18:56,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 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) [2021-05-02 12:18:56,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 12:18:56,282 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 12:18:56,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:56,283 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 12:18:56,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:56,283 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 12:18:56,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 12:18:56,283 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:56,283 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:56,493 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:18:56,493 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:56,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:56,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1665756032, now seen corresponding path program 6 times [2021-05-02 12:18:56,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:56,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027269126] [2021-05-02 12:18:56,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:56,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:56,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:56,624 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:56,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:56,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027269126] [2021-05-02 12:18:56,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027269126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1032552022] [2021-05-02 12:18:56,625 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2021-05-02 12:18:56,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 12:18:56,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:56,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 12:18:56,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:56,775 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:56,783 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:56,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1032552022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:56,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:56,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 15 [2021-05-02 12:18:56,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595279011] [2021-05-02 12:18:56,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:18:56,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:56,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:18:56,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:18:56,785 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:57,128 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 12:18:57,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:18:57,129 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 12:18:57,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:57,130 INFO L225 Difference]: With dead ends: 44 [2021-05-02 12:18:57,130 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 12:18:57,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 335.3ms TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:18:57,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 12:18:57,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 12:18:57,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 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) [2021-05-02 12:18:57,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 12:18:57,141 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 12:18:57,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:57,141 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 12:18:57,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:57,141 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 12:18:57,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 12:18:57,145 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:57,145 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:57,351 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:57,351 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:57,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:57,352 INFO L82 PathProgramCache]: Analyzing trace with hash 294362781, now seen corresponding path program 7 times [2021-05-02 12:18:57,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:57,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833021831] [2021-05-02 12:18:57,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:57,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:57,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:57,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:57,497 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:57,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:57,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833021831] [2021-05-02 12:18:57,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833021831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:57,498 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299674134] [2021-05-02 12:18:57,498 INFO L93 rtionOrderModulation]: Changing assertion order to 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 [2021-05-02 12:18:57,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:57,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 12:18:57,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:57,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:57,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:57,673 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:57,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [299674134] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:57,673 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:57,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:18:57,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977911627] [2021-05-02 12:18:57,674 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:18:57,674 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:57,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:18:57,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:18:57,674 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:58,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:58,049 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-02 12:18:58,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:18:58,063 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 12:18:58,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:58,064 INFO L225 Difference]: With dead ends: 46 [2021-05-02 12:18:58,064 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:18:58,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 313.2ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:18:58,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:18:58,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 12:18:58,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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) [2021-05-02 12:18:58,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 12:18:58,068 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 12:18:58,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:58,068 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 12:18:58,068 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:58,068 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 12:18:58,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:18:58,068 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:58,069 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:58,284 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:18:58,284 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:58,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:58,285 INFO L82 PathProgramCache]: Analyzing trace with hash 940408442, now seen corresponding path program 8 times [2021-05-02 12:18:58,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:58,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466590291] [2021-05-02 12:18:58,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:58,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:58,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:58,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:58,441 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:58,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:58,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466590291] [2021-05-02 12:18:58,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466590291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:58,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277471244] [2021-05-02 12:18:58,441 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 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 [2021-05-02 12:18:58,482 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:18:58,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:58,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 12:18:58,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:58,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:58,585 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:18:58,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277471244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:58,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:58,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 12:18:58,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425651192] [2021-05-02 12:18:58,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:18:58,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:58,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:18:58,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:18:58,587 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:59,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:18:59,039 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-02 12:18:59,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:18:59,040 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:18:59,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:18:59,040 INFO L225 Difference]: With dead ends: 48 [2021-05-02 12:18:59,040 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 12:18:59,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 382.1ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:18:59,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 12:18:59,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 12:18:59,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 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) [2021-05-02 12:18:59,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 12:18:59,044 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 12:18:59,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:18:59,044 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 12:18:59,044 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:18:59,044 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 12:18:59,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 12:18:59,045 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:18:59,045 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:18:59,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:18:59,249 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:18:59,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:18:59,249 INFO L82 PathProgramCache]: Analyzing trace with hash -979969257, now seen corresponding path program 9 times [2021-05-02 12:18:59,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:18:59,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34758859] [2021-05-02 12:18:59,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:18:59,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:18:59,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:18:59,424 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:18:59,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:18:59,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34758859] [2021-05-02 12:18:59,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [34758859] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:59,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563607583] [2021-05-02 12:18:59,424 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 [2021-05-02 12:18:59,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:18:59,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:18:59,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:18:59,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:18:59,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:18:59,665 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 12:18:59,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1563607583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:18:59,666 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:18:59,666 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 12:18:59,666 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649479240] [2021-05-02 12:18:59,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:18:59,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:18:59,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:18:59,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:18:59,667 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:00,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:00,313 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2021-05-02 12:19:00,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:19:00,313 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 12:19:00,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:00,313 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:19:00,313 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 12:19:00,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 605.8ms TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:19:00,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 12:19:00,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 12:19:00,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 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) [2021-05-02 12:19:00,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 12:19:00,317 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2021-05-02 12:19:00,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:00,317 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 12:19:00,317 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:00,318 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 12:19:00,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:19:00,318 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:00,318 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:00,520 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:19:00,520 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:00,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:00,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1192350513, now seen corresponding path program 10 times [2021-05-02 12:19:00,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:00,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289062996] [2021-05-02 12:19:00,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:00,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:00,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:00,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:00,680 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:00,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:00,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289062996] [2021-05-02 12:19:00,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289062996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:00,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573109588] [2021-05-02 12:19:00,681 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 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 [2021-05-02 12:19:00,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:00,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:00,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:19:00,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:00,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:00,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:00,802 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:00,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573109588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:00,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:00,802 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 12:19:00,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688544503] [2021-05-02 12:19:00,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:19:00,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:00,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:19:00,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:19:00,803 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:01,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:01,320 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 12:19:01,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 12:19:01,320 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 12:19:01,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:01,321 INFO L225 Difference]: With dead ends: 58 [2021-05-02 12:19:01,321 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:19:01,321 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 438.5ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:01,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:19:01,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 12:19:01,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 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) [2021-05-02 12:19:01,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 12:19:01,327 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-02 12:19:01,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:01,327 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 12:19:01,327 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:01,327 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 12:19:01,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 12:19:01,327 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:01,327 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:01,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:19:01,537 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:01,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:01,537 INFO L82 PathProgramCache]: Analyzing trace with hash 1781850028, now seen corresponding path program 11 times [2021-05-02 12:19:01,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:01,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033331717] [2021-05-02 12:19:01,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:01,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:01,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:01,714 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:01,714 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:01,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033331717] [2021-05-02 12:19:01,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033331717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:01,714 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098473005] [2021-05-02 12:19:01,714 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_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 [2021-05-02 12:19:02,050 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 12:19:02,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:02,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 12:19:02,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:02,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:02,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:02,255 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:02,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098473005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:02,256 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:02,256 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:19:02,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083167311] [2021-05-02 12:19:02,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:19:02,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:02,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:19:02,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:19:02,257 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:02,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:02,826 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-02 12:19:02,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:19:02,827 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 12:19:02,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:02,827 INFO L225 Difference]: With dead ends: 60 [2021-05-02 12:19:02,827 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 12:19:02,828 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 34 SyntacticMatches, 11 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 582.5ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:02,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 12:19:02,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 12:19:02,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 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) [2021-05-02 12:19:02,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 12:19:02,831 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-02 12:19:02,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:02,831 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 12:19:02,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:02,831 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 12:19:02,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 12:19:02,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:02,831 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:03,034 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:03,034 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:03,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:03,035 INFO L82 PathProgramCache]: Analyzing trace with hash -459649207, now seen corresponding path program 12 times [2021-05-02 12:19:03,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:03,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382306133] [2021-05-02 12:19:03,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:03,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:03,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:03,231 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:19:03,232 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:03,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382306133] [2021-05-02 12:19:03,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382306133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251509524] [2021-05-02 12:19:03,232 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2021-05-02 12:19:03,441 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 12:19:03,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:03,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 12:19:03,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:03,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:03,865 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 138 proven. 59 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 12:19:03,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251509524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:03,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:03,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 25 [2021-05-02 12:19:03,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864811497] [2021-05-02 12:19:03,866 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:19:03,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:03,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:19:03,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:19:03,867 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:04,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:04,932 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-05-02 12:19:04,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:19:04,933 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 12:19:04,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:04,934 INFO L225 Difference]: With dead ends: 70 [2021-05-02 12:19:04,934 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:19:04,935 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1151.1ms TimeCoverageRelationStatistics Valid=337, Invalid=1825, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:19:04,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:19:04,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-05-02 12:19:04,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 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) [2021-05-02 12:19:04,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 12:19:04,938 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 12:19:04,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:04,939 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 12:19:04,939 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.32) internal successors, (58), 24 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:04,939 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 12:19:04,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 12:19:04,939 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:04,939 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:05,143 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:19:05,143 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:05,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:05,143 INFO L82 PathProgramCache]: Analyzing trace with hash 1333784449, now seen corresponding path program 13 times [2021-05-02 12:19:05,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:05,144 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660434178] [2021-05-02 12:19:05,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:05,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:05,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,369 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:05,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:05,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660434178] [2021-05-02 12:19:05,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660434178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:05,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86568983] [2021-05-02 12:19:05,369 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2021-05-02 12:19:05,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:05,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:19:05,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:05,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:05,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:05,524 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:05,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86568983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:05,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:05,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:19:05,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795777830] [2021-05-02 12:19:05,525 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:19:05,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:05,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:19:05,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:19:05,525 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:06,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:06,124 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-05-02 12:19:06,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:19:06,124 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 12:19:06,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:06,125 INFO L225 Difference]: With dead ends: 68 [2021-05-02 12:19:06,125 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:19:06,126 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 567.7ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:19:06,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:19:06,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 12:19:06,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 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) [2021-05-02 12:19:06,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 12:19:06,129 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 12:19:06,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:06,129 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 12:19:06,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:06,129 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 12:19:06,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 12:19:06,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:06,130 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:06,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:19:06,333 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:06,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:06,333 INFO L82 PathProgramCache]: Analyzing trace with hash -284658338, now seen corresponding path program 14 times [2021-05-02 12:19:06,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:06,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662120368] [2021-05-02 12:19:06,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:06,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:06,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:06,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:06,601 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:06,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:06,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662120368] [2021-05-02 12:19:06,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662120368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:06,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901412594] [2021-05-02 12:19:06,602 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 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 [2021-05-02 12:19:06,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:06,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:06,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:19:06,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:06,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:06,799 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:06,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1901412594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:06,800 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:06,800 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 12:19:06,800 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747422674] [2021-05-02 12:19:06,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:19:06,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:06,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:19:06,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:19:06,801 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:07,601 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2021-05-02 12:19:07,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:19:07,601 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 12:19:07,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:07,602 INFO L225 Difference]: With dead ends: 70 [2021-05-02 12:19:07,602 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 12:19:07,603 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 719.9ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:07,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 12:19:07,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 12:19:07,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 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) [2021-05-02 12:19:07,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 12:19:07,609 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 12:19:07,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:07,609 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 12:19:07,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:07,610 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 12:19:07,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 12:19:07,610 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:07,610 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:07,818 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:07,818 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:07,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:07,819 INFO L82 PathProgramCache]: Analyzing trace with hash -830015493, now seen corresponding path program 15 times [2021-05-02 12:19:07,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:07,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878464306] [2021-05-02 12:19:07,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:07,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:08,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:08,072 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:19:08,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:08,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878464306] [2021-05-02 12:19:08,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1878464306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758109953] [2021-05-02 12:19:08,072 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 [2021-05-02 12:19:08,138 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:19:08,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:08,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:19:08,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:08,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,560 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 12:19:08,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1758109953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:08,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:08,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 12:19:08,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723510293] [2021-05-02 12:19:08,561 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:19:08,561 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:08,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:19:08,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:08,561 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:09,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:09,764 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2021-05-02 12:19:09,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:19:09,765 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 12:19:09,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:09,765 INFO L225 Difference]: With dead ends: 74 [2021-05-02 12:19:09,765 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 12:19:09,766 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 1236.7ms TimeCoverageRelationStatistics Valid=241, Invalid=2111, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:19:09,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 12:19:09,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 12:19:09,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 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) [2021-05-02 12:19:09,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 12:19:09,769 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 12:19:09,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:09,769 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 12:19:09,770 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:09,770 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 12:19:09,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 12:19:09,770 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:09,770 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:09,972 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:09,972 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:09,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:09,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1388525901, now seen corresponding path program 16 times [2021-05-02 12:19:09,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:09,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733283816] [2021-05-02 12:19:09,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:09,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:10,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:10,241 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:10,241 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:10,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733283816] [2021-05-02 12:19:10,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733283816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:10,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929402988] [2021-05-02 12:19:10,241 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 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 [2021-05-02 12:19:10,283 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:10,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:10,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 12:19:10,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:10,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:10,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:10,406 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:10,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929402988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:10,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:10,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:19:10,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142949070] [2021-05-02 12:19:10,408 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:19:10,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:10,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:19:10,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:19:10,410 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:11,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:11,210 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-05-02 12:19:11,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:19:11,211 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 12:19:11,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:11,211 INFO L225 Difference]: With dead ends: 78 [2021-05-02 12:19:11,211 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:19:11,212 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 704.1ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:11,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:19:11,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 12:19:11,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 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) [2021-05-02 12:19:11,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 12:19:11,215 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 12:19:11,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:11,215 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 12:19:11,216 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:11,216 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 12:19:11,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:19:11,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:11,216 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:11,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:11,425 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:11,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:11,425 INFO L82 PathProgramCache]: Analyzing trace with hash -779870320, now seen corresponding path program 17 times [2021-05-02 12:19:11,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:11,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119578697] [2021-05-02 12:19:11,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:11,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:11,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:11,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:11,711 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:11,711 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:11,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119578697] [2021-05-02 12:19:11,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2119578697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:11,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933945596] [2021-05-02 12:19:11,712 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2021-05-02 12:19:13,050 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 12:19:13,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:13,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:19:13,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:13,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:13,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:13,335 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:13,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933945596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:13,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:13,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:19:13,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543988446] [2021-05-02 12:19:13,336 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:19:13,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:13,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:19:13,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:19:13,337 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:14,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:14,185 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-05-02 12:19:14,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:19:14,186 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:19:14,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:14,186 INFO L225 Difference]: With dead ends: 80 [2021-05-02 12:19:14,186 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 12:19:14,187 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 48 SyntacticMatches, 13 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 900.0ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:19:14,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 12:19:14,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 12:19:14,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 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) [2021-05-02 12:19:14,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 12:19:14,191 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 12:19:14,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:14,191 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 12:19:14,191 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.2083333333333335) internal successors, (53), 23 states have internal predecessors, (53), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:14,191 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 12:19:14,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 12:19:14,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:14,191 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:14,394 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:19:14,395 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:14,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:14,395 INFO L82 PathProgramCache]: Analyzing trace with hash 22590765, now seen corresponding path program 18 times [2021-05-02 12:19:14,395 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:14,395 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082061085] [2021-05-02 12:19:14,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:14,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:14,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:14,723 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:19:14,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:14,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082061085] [2021-05-02 12:19:14,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082061085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:14,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486327553] [2021-05-02 12:19:14,724 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 [2021-05-02 12:19:15,318 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 12:19:15,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:15,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:19:15,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:15,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:15,967 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 244 proven. 73 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-05-02 12:19:15,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486327553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:15,967 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:15,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9] total 31 [2021-05-02 12:19:15,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059253997] [2021-05-02 12:19:15,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:19:15,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:15,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:19:15,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=813, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:19:15,968 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:17,638 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2021-05-02 12:19:17,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:19:17,652 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 12:19:17,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:17,653 INFO L225 Difference]: With dead ends: 86 [2021-05-02 12:19:17,653 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:19:17,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 58 SyntacticMatches, 4 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 1773.2ms TimeCoverageRelationStatistics Valid=347, Invalid=3075, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:19:17,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:19:17,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2021-05-02 12:19:17,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 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) [2021-05-02 12:19:17,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 12:19:17,660 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 12:19:17,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:17,661 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 12:19:17,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.2580645161290325) internal successors, (70), 30 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:17,661 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 12:19:17,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 12:19:17,664 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:17,664 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:17,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:19:17,867 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:17,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:17,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1280798107, now seen corresponding path program 19 times [2021-05-02 12:19:17,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:17,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446576287] [2021-05-02 12:19:17,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:17,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,173 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:18,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:18,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446576287] [2021-05-02 12:19:18,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446576287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679119395] [2021-05-02 12:19:18,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:18,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:18,211 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 12:19:18,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:18,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,340 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:18,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679119395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:18,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 12:19:18,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953992302] [2021-05-02 12:19:18,341 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 12:19:18,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:18,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 12:19:18,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 12:19:18,341 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:19,343 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-05-02 12:19:19,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 12:19:19,343 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 12:19:19,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:19,343 INFO L225 Difference]: With dead ends: 88 [2021-05-02 12:19:19,343 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 12:19:19,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 882.1ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 12:19:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 12:19:19,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 12:19:19,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 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) [2021-05-02 12:19:19,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 12:19:19,347 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 12:19:19,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:19,347 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 12:19:19,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:19,348 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 12:19:19,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 12:19:19,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:19,348 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:19,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,548 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:19,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:19,549 INFO L82 PathProgramCache]: Analyzing trace with hash 640400962, now seen corresponding path program 20 times [2021-05-02 12:19:19,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:19,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989624548] [2021-05-02 12:19:19,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:19,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:19,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:19,881 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:19,881 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:19,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989624548] [2021-05-02 12:19:19,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989624548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:19,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158081458] [2021-05-02 12:19:19,881 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:19,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:19,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:19,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 12:19:19,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:20,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:20,211 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:20,211 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158081458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:20,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:20,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 12:19:20,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377796456] [2021-05-02 12:19:20,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 12:19:20,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:20,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 12:19:20,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 12:19:20,213 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:21,447 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-05-02 12:19:21,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:19:21,449 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 12:19:21,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:21,449 INFO L225 Difference]: With dead ends: 90 [2021-05-02 12:19:21,449 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:19:21,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1134.2ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:21,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:19:21,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 12:19:21,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 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) [2021-05-02 12:19:21,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 12:19:21,458 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 12:19:21,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:21,458 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 12:19:21,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:21,458 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 12:19:21,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 12:19:21,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:21,459 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:21,671 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:19:21,671 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:21,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:21,672 INFO L82 PathProgramCache]: Analyzing trace with hash 76768991, now seen corresponding path program 21 times [2021-05-02 12:19:21,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:21,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999981023] [2021-05-02 12:19:21,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:21,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:22,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:22,099 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:19:22,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:22,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999981023] [2021-05-02 12:19:22,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999981023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816525476] [2021-05-02 12:19:22,100 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:22,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 12:19:22,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:22,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:19:22,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:22,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:22,579 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 12:19:22,579 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816525476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:22,579 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:22,579 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 12:19:22,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948388877] [2021-05-02 12:19:22,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 12:19:22,580 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:22,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 12:19:22,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:19:22,581 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:25,319 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2021-05-02 12:19:25,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:19:25,319 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 12:19:25,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:25,319 INFO L225 Difference]: With dead ends: 96 [2021-05-02 12:19:25,319 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:19:25,320 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 2807.5ms TimeCoverageRelationStatistics Valid=505, Invalid=3785, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:19:25,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:19:25,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 12:19:25,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 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) [2021-05-02 12:19:25,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 12:19:25,324 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 12:19:25,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:25,324 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 12:19:25,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:25,324 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 12:19:25,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 12:19:25,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:25,325 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:25,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:25,527 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:25,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:25,528 INFO L82 PathProgramCache]: Analyzing trace with hash 198128279, now seen corresponding path program 22 times [2021-05-02 12:19:25,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:25,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492016116] [2021-05-02 12:19:25,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:25,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:25,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:25,971 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:25,971 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:25,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492016116] [2021-05-02 12:19:25,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492016116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:25,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250306543] [2021-05-02 12:19:25,972 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:26,014 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:26,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:26,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:19:26,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:26,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:26,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:26,157 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:26,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250306543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:26,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:26,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 12:19:26,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256933564] [2021-05-02 12:19:26,157 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:19:26,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:26,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:19:26,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:19:26,158 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:27,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:27,409 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2021-05-02 12:19:27,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 12:19:27,409 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 12:19:27,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:27,410 INFO L225 Difference]: With dead ends: 98 [2021-05-02 12:19:27,410 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:19:27,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1133.6ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:19:27,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:19:27,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 12:19:27,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 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) [2021-05-02 12:19:27,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 12:19:27,414 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 12:19:27,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:27,414 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 12:19:27,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:27,414 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 12:19:27,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 12:19:27,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:27,415 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:27,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 12:19:27,621 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:27,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:27,621 INFO L82 PathProgramCache]: Analyzing trace with hash -922013324, now seen corresponding path program 23 times [2021-05-02 12:19:27,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:27,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891636432] [2021-05-02 12:19:27,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:27,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:28,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:28,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:28,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:28,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891636432] [2021-05-02 12:19:28,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891636432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:28,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767026289] [2021-05-02 12:19:28,053 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:33,784 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 12:19:33,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:33,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 12:19:33,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:34,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:34,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767026289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:34,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:34,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:19:34,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114176962] [2021-05-02 12:19:34,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:19:34,348 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:34,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:19:34,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:19:34,348 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:35,654 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-05-02 12:19:35,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:19:35,655 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 12:19:35,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:35,655 INFO L225 Difference]: With dead ends: 100 [2021-05-02 12:19:35,655 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 12:19:35,656 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 48 SyntacticMatches, 29 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1548.5ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:19:35,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 12:19:35,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 12:19:35,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 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) [2021-05-02 12:19:35,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 12:19:35,660 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 12:19:35,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:35,660 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 12:19:35,660 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,660 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 12:19:35,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 12:19:35,661 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:35,661 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:35,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:19:35,861 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:35,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:35,862 INFO L82 PathProgramCache]: Analyzing trace with hash 658697489, now seen corresponding path program 24 times [2021-05-02 12:19:35,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:35,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831184433] [2021-05-02 12:19:35,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:35,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:36,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,357 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:19:36,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:36,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831184433] [2021-05-02 12:19:36,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831184433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [83888621] [2021-05-02 12:19:36,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:37,967 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 12:19:37,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:37,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 12:19:37,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:38,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:38,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 442 proven. 177 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2021-05-02 12:19:38,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [83888621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:38,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:38,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 11] total 39 [2021-05-02 12:19:38,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133008674] [2021-05-02 12:19:38,671 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 12:19:38,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:38,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 12:19:38,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1252, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 12:19:38,672 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:41,261 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:19:41,779 WARN L205 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:19:42,267 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:19:43,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:43,117 INFO L93 Difference]: Finished difference Result 110 states and 120 transitions. [2021-05-02 12:19:43,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:19:43,117 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 12:19:43,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:43,118 INFO L225 Difference]: With dead ends: 110 [2021-05-02 12:19:43,118 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:19:43,119 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 763 ImplicationChecksByTransitivity, 4688.2ms TimeCoverageRelationStatistics Valid=695, Invalid=5157, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 12:19:43,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:19:43,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2021-05-02 12:19:43,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 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) [2021-05-02 12:19:43,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 12:19:43,123 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 12:19:43,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:43,124 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 12:19:43,124 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 38 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:43,124 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 12:19:43,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 12:19:43,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:43,124 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:43,330 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:19:43,330 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:43,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:43,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1682212681, now seen corresponding path program 25 times [2021-05-02 12:19:43,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:43,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061664193] [2021-05-02 12:19:43,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:43,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:43,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:19:43,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:43,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061664193] [2021-05-02 12:19:43,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061664193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:43,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839090864] [2021-05-02 12:19:43,846 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:43,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:43,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 12:19:43,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:44,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:44,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:44,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:19:44,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839090864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:44,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:44,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 12:19:44,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728011000] [2021-05-02 12:19:44,066 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 12:19:44,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:44,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 12:19:44,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:19:44,067 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:45,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:45,565 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2021-05-02 12:19:45,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 12:19:45,566 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 12:19:45,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:45,566 INFO L225 Difference]: With dead ends: 108 [2021-05-02 12:19:45,566 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 12:19:45,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1317.6ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 12:19:45,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 12:19:45,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 12:19:45,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 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) [2021-05-02 12:19:45,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 12:19:45,571 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 12:19:45,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:45,572 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 12:19:45,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:45,572 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 12:19:45,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 12:19:45,572 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:45,572 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:45,777 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:45,778 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:45,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:45,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1682548442, now seen corresponding path program 26 times [2021-05-02 12:19:45,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:45,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359466850] [2021-05-02 12:19:45,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:45,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:46,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:46,312 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:19:46,312 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:46,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359466850] [2021-05-02 12:19:46,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359466850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249120838] [2021-05-02 12:19:46,313 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:46,353 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:19:46,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:46,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 12:19:46,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:46,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:46,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:19:46,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [249120838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:46,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:46,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 12:19:46,744 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749776863] [2021-05-02 12:19:46,744 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:19:46,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:46,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:19:46,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:19:46,745 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:48,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:48,629 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2021-05-02 12:19:48,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:19:48,630 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 12:19:48,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:48,630 INFO L225 Difference]: With dead ends: 110 [2021-05-02 12:19:48,630 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 12:19:48,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1712.4ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:19:48,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 12:19:48,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 12:19:48,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 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) [2021-05-02 12:19:48,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 12:19:48,636 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 12:19:48,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:48,636 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 12:19:48,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:48,636 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 12:19:48,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 12:19:48,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:48,636 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:48,849 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 12:19:48,849 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:48,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:48,849 INFO L82 PathProgramCache]: Analyzing trace with hash -1107613757, now seen corresponding path program 27 times [2021-05-02 12:19:48,850 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:48,850 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420050822] [2021-05-02 12:19:48,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:48,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:49,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:49,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:19:49,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:49,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420050822] [2021-05-02 12:19:49,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420050822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:49,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97846989] [2021-05-02 12:19:49,467 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:49,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 12:19:49,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:49,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 12:19:49,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:50,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:50,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 12:19:50,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97846989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:50,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:50,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 12:19:50,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657133325] [2021-05-02 12:19:50,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 12:19:50,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:50,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 12:19:50,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1432, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:19:50,100 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:52,303 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:19:54,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:54,187 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2021-05-02 12:19:54,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:19:54,188 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 12:19:54,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:54,188 INFO L225 Difference]: With dead ends: 116 [2021-05-02 12:19:54,188 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 12:19:54,189 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 826 ImplicationChecksByTransitivity, 4160.6ms TimeCoverageRelationStatistics Valid=899, Invalid=5743, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:19:54,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 12:19:54,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2021-05-02 12:19:54,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 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) [2021-05-02 12:19:54,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-02 12:19:54,194 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2021-05-02 12:19:54,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:54,194 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-02 12:19:54,194 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:54,194 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-02 12:19:54,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:19:54,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:54,194 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:54,397 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:54,397 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:54,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:54,397 INFO L82 PathProgramCache]: Analyzing trace with hash 790917243, now seen corresponding path program 28 times [2021-05-02 12:19:54,397 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:54,397 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664239499] [2021-05-02 12:19:54,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:54,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:54,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:54,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:54,968 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:54,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:54,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664239499] [2021-05-02 12:19:54,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664239499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:54,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526156573] [2021-05-02 12:19:54,969 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:55,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:19:55,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:55,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:19:55,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:55,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:55,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:55,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:55,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526156573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:55,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:55,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 12:19:55,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555127114] [2021-05-02 12:19:55,221 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:19:55,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:55,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:19:55,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:19:55,222 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:57,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:57,001 INFO L93 Difference]: Finished difference Result 116 states and 121 transitions. [2021-05-02 12:19:57,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 12:19:57,002 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 12:19:57,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:57,002 INFO L225 Difference]: With dead ends: 116 [2021-05-02 12:19:57,002 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 12:19:57,003 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1556.0ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:19:57,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 12:19:57,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-05-02 12:19:57,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 87 states have (on average 1.0344827586206897) internal successors, (90), 87 states have internal predecessors, (90), 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) [2021-05-02 12:19:57,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2021-05-02 12:19:57,008 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2021-05-02 12:19:57,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:57,008 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2021-05-02 12:19:57,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:57,008 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2021-05-02 12:19:57,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 12:19:57,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:57,008 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:57,217 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 12:19:57,218 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:57,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:57,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1128863064, now seen corresponding path program 29 times [2021-05-02 12:19:57,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:57,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946073449] [2021-05-02 12:19:57,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:57,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:57,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:57,797 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:19:57,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:57,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946073449] [2021-05-02 12:19:57,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946073449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:57,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464313707] [2021-05-02 12:19:57,797 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:18,618 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 12:20:18,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:18,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 117 conjunts are in the unsatisfiable core [2021-05-02 12:20:18,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:19,373 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:20:19,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464313707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:19,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:19,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:20:19,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [993183776] [2021-05-02 12:20:19,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:20:19,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:19,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:20:19,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:20:19,374 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:21,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:21,259 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2021-05-02 12:20:21,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:20:21,261 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 12:20:21,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:21,261 INFO L225 Difference]: With dead ends: 118 [2021-05-02 12:20:21,261 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 12:20:21,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 61 SyntacticMatches, 32 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 559 ImplicationChecksByTransitivity, 2122.5ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:20:21,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 12:20:21,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-05-02 12:20:21,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 states have internal predecessors, (92), 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) [2021-05-02 12:20:21,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-02 12:20:21,266 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 91 [2021-05-02 12:20:21,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:21,267 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-02 12:20:21,267 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.138888888888889) internal successors, (77), 35 states have internal predecessors, (77), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:21,267 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-02 12:20:21,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 12:20:21,267 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:21,267 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:21,472 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 12:20:21,472 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:21,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:21,472 INFO L82 PathProgramCache]: Analyzing trace with hash -522717451, now seen corresponding path program 30 times [2021-05-02 12:20:21,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:21,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [405501660] [2021-05-02 12:20:21,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:21,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:22,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:22,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:20:22,118 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:22,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [405501660] [2021-05-02 12:20:22,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [405501660] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:22,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266294082] [2021-05-02 12:20:22,118 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:23,923 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 12:20:23,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:23,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:20:23,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:24,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:24,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:25,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:25,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 648 proven. 161 refuted. 0 times theorem prover too weak. 872 trivial. 0 not checked. [2021-05-02 12:20:25,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266294082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:25,096 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:25,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 13] total 47 [2021-05-02 12:20:25,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505962005] [2021-05-02 12:20:25,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:20:25,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:25,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:20:25,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=1921, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:20:25,097 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:29,469 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:20:29,938 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:20:30,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:30,652 INFO L93 Difference]: Finished difference Result 129 states and 140 transitions. [2021-05-02 12:20:30,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:20:30,653 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-02 12:20:30,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:30,653 INFO L225 Difference]: With dead ends: 129 [2021-05-02 12:20:30,653 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 12:20:30,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 91 SyntacticMatches, 3 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1114 ImplicationChecksByTransitivity, 5664.2ms TimeCoverageRelationStatistics Valid=756, Invalid=7800, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 12:20:30,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 12:20:30,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 99. [2021-05-02 12:20:30,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 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) [2021-05-02 12:20:30,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 12:20:30,659 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 12:20:30,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:30,659 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 12:20:30,659 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.1702127659574466) internal successors, (102), 46 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:30,659 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 12:20:30,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 12:20:30,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:30,660 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:30,863 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:20:30,863 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:30,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:30,864 INFO L82 PathProgramCache]: Analyzing trace with hash -535638483, now seen corresponding path program 31 times [2021-05-02 12:20:30,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:30,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142842067] [2021-05-02 12:20:30,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:30,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:31,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:31,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:31,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:31,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:31,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142842067] [2021-05-02 12:20:31,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142842067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:31,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893853137] [2021-05-02 12:20:31,550 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:31,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:31,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:20:31,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:31,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:31,794 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:31,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:31,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893853137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:31,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:31,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 12:20:31,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074312431] [2021-05-02 12:20:31,818 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 12:20:31,818 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:31,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 12:20:31,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 12:20:31,818 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:34,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:34,000 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-02 12:20:34,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 12:20:34,000 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-02 12:20:34,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:34,001 INFO L225 Difference]: With dead ends: 128 [2021-05-02 12:20:34,001 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 12:20:34,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 1802.7ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 12:20:34,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 12:20:34,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 12:20:34,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 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) [2021-05-02 12:20:34,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 12:20:34,007 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 12:20:34,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:34,007 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 12:20:34,007 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:34,007 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 12:20:34,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 12:20:34,007 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:34,008 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:34,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 12:20:34,209 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:34,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:34,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1718044170, now seen corresponding path program 32 times [2021-05-02 12:20:34,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:34,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011736398] [2021-05-02 12:20:34,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:34,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:34,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:34,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:34,912 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:34,912 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:34,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011736398] [2021-05-02 12:20:34,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011736398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:34,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856064061] [2021-05-02 12:20:34,912 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:34,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:20:34,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:34,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 12:20:34,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:35,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:35,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:20:35,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856064061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:35,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:35,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 12:20:35,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943537434] [2021-05-02 12:20:35,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 12:20:35,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:35,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 12:20:35,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 12:20:35,517 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:38,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:38,239 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2021-05-02 12:20:38,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:20:38,240 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-02 12:20:38,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:38,240 INFO L225 Difference]: With dead ends: 130 [2021-05-02 12:20:38,240 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 12:20:38,241 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2377.4ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:20:38,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 12:20:38,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 12:20:38,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 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) [2021-05-02 12:20:38,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 12:20:38,247 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 12:20:38,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:38,247 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 12:20:38,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:38,247 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 12:20:38,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 12:20:38,248 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:38,248 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:38,452 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:20:38,453 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:38,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:38,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1451410777, now seen corresponding path program 33 times [2021-05-02 12:20:38,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:38,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336734629] [2021-05-02 12:20:38,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:39,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:39,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:39,200 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:20:39,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:39,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336734629] [2021-05-02 12:20:39,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336734629] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:39,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [165805576] [2021-05-02 12:20:39,201 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:39,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 12:20:39,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:39,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 12:20:39,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:40,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:40,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 12:20:40,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [165805576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:40,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:40,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 12:20:40,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840277523] [2021-05-02 12:20:40,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:20:40,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:40,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:20:40,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=2068, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:20:40,184 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:43,629 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:20:44,651 WARN L205 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:20:45,612 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:20:46,537 WARN L205 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:20:49,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:49,555 INFO L93 Difference]: Finished difference Result 136 states and 144 transitions. [2021-05-02 12:20:49,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:20:49,561 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 12:20:49,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:49,561 INFO L225 Difference]: With dead ends: 136 [2021-05-02 12:20:49,561 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 12:20:49,562 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1205 ImplicationChecksByTransitivity, 9293.8ms TimeCoverageRelationStatistics Valid=1037, Invalid=8469, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:20:49,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 12:20:49,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2021-05-02 12:20:49,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 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) [2021-05-02 12:20:49,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 12:20:49,571 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 12:20:49,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:49,572 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 12:20:49,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:49,572 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 12:20:49,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 12:20:49,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:49,573 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:49,774 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:20:49,774 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:49,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:49,774 INFO L82 PathProgramCache]: Analyzing trace with hash -1438941089, now seen corresponding path program 34 times [2021-05-02 12:20:49,774 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:49,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443594686] [2021-05-02 12:20:49,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:49,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:50,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:50,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:50,563 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:50,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:50,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443594686] [2021-05-02 12:20:50,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1443594686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:50,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972240508] [2021-05-02 12:20:50,564 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:50,612 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:20:50,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:50,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 12:20:50,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:50,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:50,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:50,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:50,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972240508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:50,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:50,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 12:20:50,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469593527] [2021-05-02 12:20:50,861 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:20:50,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:50,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:20:50,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:20:50,862 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:53,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:53,338 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2021-05-02 12:20:53,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 12:20:53,339 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 12:20:53,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:53,339 INFO L225 Difference]: With dead ends: 138 [2021-05-02 12:20:53,339 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 12:20:53,340 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2090.6ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:20:53,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 12:20:53,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 12:20:53,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 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) [2021-05-02 12:20:53,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 12:20:53,346 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 12:20:53,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:53,346 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 12:20:53,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:53,346 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 12:20:53,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 12:20:53,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:53,347 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:53,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:20:53,555 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:53,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:53,555 INFO L82 PathProgramCache]: Analyzing trace with hash 1799146300, now seen corresponding path program 35 times [2021-05-02 12:20:53,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:53,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404533759] [2021-05-02 12:20:53,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:53,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:54,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:54,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:54,358 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:20:54,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:54,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404533759] [2021-05-02 12:20:54,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1404533759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:54,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890311004] [2021-05-02 12:20:54,358 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:11,084 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 12:21:11,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:11,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 12:21:11,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:11,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:11,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:11,413 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 680 proven. 1560 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:21:11,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890311004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:11,414 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:11,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42] total 44 [2021-05-02 12:21:11,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411256808] [2021-05-02 12:21:11,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:21:11,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:11,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:21:11,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1769, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:21:11,415 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:14,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:14,163 INFO L93 Difference]: Finished difference Result 140 states and 145 transitions. [2021-05-02 12:21:14,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 12:21:14,164 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 12:21:14,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:14,164 INFO L225 Difference]: With dead ends: 140 [2021-05-02 12:21:14,165 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 12:21:14,165 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 2273.1ms TimeCoverageRelationStatistics Valid=313, Invalid=6329, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 12:21:14,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 12:21:14,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 12:21:14,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 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) [2021-05-02 12:21:14,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 12:21:14,172 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 12:21:14,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:14,172 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 12:21:14,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:14,172 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 12:21:14,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 12:21:14,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:14,172 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:14,374 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:21:14,374 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:14,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:14,374 INFO L82 PathProgramCache]: Analyzing trace with hash -250162471, now seen corresponding path program 36 times [2021-05-02 12:21:14,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:14,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [786239032] [2021-05-02 12:21:14,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:14,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:15,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:15,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:15,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:21:15,272 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:15,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [786239032] [2021-05-02 12:21:15,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [786239032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:15,272 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908705448] [2021-05-02 12:21:15,272 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:25,973 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 12:21:25,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:25,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 12:21:25,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:26,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:26,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:26,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:26,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:27,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:27,483 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 874 proven. 121 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2021-05-02 12:21:27,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908705448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:27,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:27,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 14] total 54 [2021-05-02 12:21:27,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18627602] [2021-05-02 12:21:27,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 12:21:27,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:27,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 12:21:27,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=2583, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 12:21:27,484 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:33,405 WARN L205 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:21:34,295 WARN L205 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:21:35,225 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:21:36,566 WARN L205 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:21:37,551 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:21:38,389 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:21:39,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:39,009 INFO L93 Difference]: Finished difference Result 146 states and 154 transitions. [2021-05-02 12:21:39,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:21:39,010 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 12:21:39,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:39,011 INFO L225 Difference]: With dead ends: 146 [2021-05-02 12:21:39,011 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 12:21:39,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 108 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 11102.0ms TimeCoverageRelationStatistics Valid=803, Invalid=10327, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 12:21:39,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 12:21:39,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 115. [2021-05-02 12:21:39,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 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) [2021-05-02 12:21:39,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 12:21:39,018 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 12:21:39,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:39,019 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 12:21:39,019 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 53 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:39,019 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 12:21:39,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 12:21:39,019 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:39,019 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:39,236 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:39,237 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:39,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:39,237 INFO L82 PathProgramCache]: Analyzing trace with hash -1101895919, now seen corresponding path program 37 times [2021-05-02 12:21:39,237 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:39,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1790762922] [2021-05-02 12:21:39,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:39,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:40,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:40,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:40,157 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:40,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:40,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1790762922] [2021-05-02 12:21:40,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1790762922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:40,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1531797611] [2021-05-02 12:21:40,158 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:40,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:40,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 12:21:40,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:40,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:40,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:40,473 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:40,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1531797611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:40,474 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:40,474 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 12:21:40,474 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570506749] [2021-05-02 12:21:40,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 12:21:40,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:40,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 12:21:40,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:21:40,475 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:43,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:43,405 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2021-05-02 12:21:43,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:21:43,406 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 12:21:43,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:43,407 INFO L225 Difference]: With dead ends: 148 [2021-05-02 12:21:43,407 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 12:21:43,407 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2409.4ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 12:21:43,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 12:21:43,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 12:21:43,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 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) [2021-05-02 12:21:43,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 12:21:43,414 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 12:21:43,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:43,414 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 12:21:43,414 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:43,414 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 12:21:43,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 12:21:43,415 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:43,415 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:43,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:43,617 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:43,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:43,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1250065170, now seen corresponding path program 38 times [2021-05-02 12:21:43,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:43,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277531871] [2021-05-02 12:21:43,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:43,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:44,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:44,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:44,580 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:44,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:44,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277531871] [2021-05-02 12:21:44,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277531871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:44,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147172690] [2021-05-02 12:21:44,580 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:44,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:21:44,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:44,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 12:21:44,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:45,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:45,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:21:45,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147172690] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:45,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:45,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 12:21:45,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329786419] [2021-05-02 12:21:45,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 12:21:45,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:45,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 12:21:45,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 12:21:45,374 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:49,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:49,461 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2021-05-02 12:21:49,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 12:21:49,462 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-02 12:21:49,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:49,462 INFO L225 Difference]: With dead ends: 150 [2021-05-02 12:21:49,462 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 12:21:49,463 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3354.5ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 12:21:49,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 12:21:49,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 12:21:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 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) [2021-05-02 12:21:49,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 12:21:49,470 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 12:21:49,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:49,470 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 12:21:49,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:49,470 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 12:21:49,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 12:21:49,471 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:49,471 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:49,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 12:21:49,693 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:49,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:49,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1906794613, now seen corresponding path program 39 times [2021-05-02 12:21:49,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:49,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364756457] [2021-05-02 12:21:49,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:49,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:50,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:50,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:50,812 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:21:50,812 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:50,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364756457] [2021-05-02 12:21:50,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364756457] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:50,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965394256] [2021-05-02 12:21:50,813 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:51,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 12:21:51,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:51,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:21:51,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:52,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:52,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 12:21:52,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965394256] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:52,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:52,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 12:21:52,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657013376] [2021-05-02 12:21:52,095 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 12:21:52,095 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:52,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 12:21:52,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=2788, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:21:52,096 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:55,810 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 45 [2021-05-02 12:21:57,346 WARN L205 SmtUtils]: Spent 402.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 12:21:58,717 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:21:59,624 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:22:00,668 WARN L205 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:22:01,531 WARN L205 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:22:02,297 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:22:04,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:04,680 INFO L93 Difference]: Finished difference Result 156 states and 164 transitions. [2021-05-02 12:22:04,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:22:04,681 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 117 [2021-05-02 12:22:04,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:04,682 INFO L225 Difference]: With dead ends: 156 [2021-05-02 12:22:04,682 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 12:22:04,682 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1632 ImplicationChecksByTransitivity, 12768.3ms TimeCoverageRelationStatistics Valid=1595, Invalid=11287, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 12:22:04,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 12:22:04,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 122. [2021-05-02 12:22:04,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 117 states have (on average 1.0256410256410255) internal successors, (120), 117 states have internal predecessors, (120), 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) [2021-05-02 12:22:04,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 124 transitions. [2021-05-02 12:22:04,690 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 124 transitions. Word has length 117 [2021-05-02 12:22:04,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:04,690 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 124 transitions. [2021-05-02 12:22:04,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:04,690 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 124 transitions. [2021-05-02 12:22:04,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 12:22:04,690 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:04,690 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:04,893 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:04,894 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:04,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:04,894 INFO L82 PathProgramCache]: Analyzing trace with hash 143876675, now seen corresponding path program 40 times [2021-05-02 12:22:04,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:04,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411656964] [2021-05-02 12:22:04,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:04,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:05,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:05,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:05,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:05,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:05,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411656964] [2021-05-02 12:22:05,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411656964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:05,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601283667] [2021-05-02 12:22:05,962 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:06,022 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:22:06,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:22:06,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 12:22:06,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:22:06,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:06,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:22:06,308 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:06,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601283667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:06,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:22:06,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 12:22:06,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820084736] [2021-05-02 12:22:06,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 12:22:06,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:22:06,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 12:22:06,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 12:22:06,309 INFO L87 Difference]: Start difference. First operand 122 states and 124 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:09,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:22:09,827 INFO L93 Difference]: Finished difference Result 156 states and 161 transitions. [2021-05-02 12:22:09,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 12:22:09,828 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 121 [2021-05-02 12:22:09,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:22:09,829 INFO L225 Difference]: With dead ends: 156 [2021-05-02 12:22:09,829 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 12:22:09,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 2798.5ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 12:22:09,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 12:22:09,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2021-05-02 12:22:09,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 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) [2021-05-02 12:22:09,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 12:22:09,837 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 121 [2021-05-02 12:22:09,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:22:09,837 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 12:22:09,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:22:09,837 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 12:22:09,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 12:22:09,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:22:09,838 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:22:10,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:22:10,038 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:22:10,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:22:10,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1684362016, now seen corresponding path program 41 times [2021-05-02 12:22:10,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:22:10,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1250266329] [2021-05-02 12:22:10,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:22:10,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:11,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:22:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:22:11,157 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:22:11,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:22:11,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1250266329] [2021-05-02 12:22:11,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1250266329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:22:11,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [541165010] [2021-05-02 12:22:11,158 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:23:54,211 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 12:23:54,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:23:54,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 12:23:54,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:23:54,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:54,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:23:54,889 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:23:54,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [541165010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:23:54,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:23:54,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 12:23:54,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360111308] [2021-05-02 12:23:54,890 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 12:23:54,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:23:54,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 12:23:54,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 12:23:54,890 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:58,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:23:58,687 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2021-05-02 12:23:58,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 12:23:58,688 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 123 [2021-05-02 12:23:58,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:23:58,689 INFO L225 Difference]: With dead ends: 158 [2021-05-02 12:23:58,689 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 12:23:58,689 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 113 SyntacticMatches, 9 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 972 ImplicationChecksByTransitivity, 3316.6ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 12:23:58,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 12:23:58,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 126. [2021-05-02 12:23:58,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 121 states have (on average 1.024793388429752) internal successors, (124), 121 states have internal predecessors, (124), 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) [2021-05-02 12:23:58,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 128 transitions. [2021-05-02 12:23:58,697 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 128 transitions. Word has length 123 [2021-05-02 12:23:58,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:23:58,697 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 128 transitions. [2021-05-02 12:23:58,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:23:58,697 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 128 transitions. [2021-05-02 12:23:58,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 12:23:58,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:23:58,698 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:23:58,906 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:23:58,907 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:23:58,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:23:58,907 INFO L82 PathProgramCache]: Analyzing trace with hash 327057597, now seen corresponding path program 42 times [2021-05-02 12:23:58,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:23:58,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562287860] [2021-05-02 12:23:58,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:23:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:00,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:00,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:00,053 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:24:00,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:00,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562287860] [2021-05-02 12:24:00,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562287860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:00,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796810022] [2021-05-02 12:24:00,053 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:13,463 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 12:24:13,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:13,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 12:24:13,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:13,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:13,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:13,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:13,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:13,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:13,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:15,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:15,822 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1244 proven. 281 refuted. 0 times theorem prover too weak. 1724 trivial. 0 not checked. [2021-05-02 12:24:15,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796810022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:15,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:15,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 17] total 63 [2021-05-02 12:24:15,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17139201] [2021-05-02 12:24:15,823 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 12:24:15,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:15,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 12:24:15,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=3573, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:24:15,823 INFO L87 Difference]: Start difference. First operand 126 states and 128 transitions. Second operand has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:21,872 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:24:22,498 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:24:28,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:28,410 INFO L93 Difference]: Finished difference Result 169 states and 180 transitions. [2021-05-02 12:24:28,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2021-05-02 12:24:28,411 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-02 12:24:28,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:28,411 INFO L225 Difference]: With dead ends: 169 [2021-05-02 12:24:28,411 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 12:24:28,412 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 123 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1998 ImplicationChecksByTransitivity, 12362.8ms TimeCoverageRelationStatistics Valid=1040, Invalid=14460, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 12:24:28,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 12:24:28,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2021-05-02 12:24:28,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 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) [2021-05-02 12:24:28,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 12:24:28,420 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-02 12:24:28,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:28,421 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 12:24:28,421 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 2.126984126984127) internal successors, (134), 62 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:28,421 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 12:24:28,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 12:24:28,421 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:28,421 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:28,627 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 12:24:28,627 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:28,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:28,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1858228725, now seen corresponding path program 43 times [2021-05-02 12:24:28,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:28,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60442247] [2021-05-02 12:24:28,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:28,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:29,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:29,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:29,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:24:29,907 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:29,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60442247] [2021-05-02 12:24:29,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60442247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:29,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697620707] [2021-05-02 12:24:29,907 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:29,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:29,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 12:24:29,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:30,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:30,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:30,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:24:30,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697620707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:30,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:30,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 12:24:30,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113076590] [2021-05-02 12:24:30,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 12:24:30,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:30,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 12:24:30,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 12:24:30,275 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:34,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:34,369 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2021-05-02 12:24:34,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 12:24:34,370 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 129 [2021-05-02 12:24:34,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:34,370 INFO L225 Difference]: With dead ends: 168 [2021-05-02 12:24:34,370 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 12:24:34,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 3243.2ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 12:24:34,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 12:24:34,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 12:24:34,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 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) [2021-05-02 12:24:34,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 12:24:34,379 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-02 12:24:34,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:34,379 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 12:24:34,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:34,379 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 12:24:34,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 12:24:34,380 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:34,380 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:34,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 12:24:34,580 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:34,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:34,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1866983982, now seen corresponding path program 44 times [2021-05-02 12:24:34,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:34,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78793113] [2021-05-02 12:24:34,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:34,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:35,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:35,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:35,848 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:24:35,849 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:35,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78793113] [2021-05-02 12:24:35,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78793113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:35,849 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663362371] [2021-05-02 12:24:35,849 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:35,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:24:35,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:35,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 12:24:35,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:36,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:36,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:24:36,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663362371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:36,946 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:36,946 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 12:24:36,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634523667] [2021-05-02 12:24:36,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 12:24:36,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:36,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 12:24:36,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:24:36,947 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:42,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:24:42,231 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2021-05-02 12:24:42,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 12:24:42,232 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 12:24:42,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:24:42,233 INFO L225 Difference]: With dead ends: 170 [2021-05-02 12:24:42,233 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 12:24:42,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 4359.1ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:24:42,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 12:24:42,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-02 12:24:42,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 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) [2021-05-02 12:24:42,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 12:24:42,242 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 12:24:42,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:24:42,243 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 12:24:42,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:24:42,243 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 12:24:42,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 12:24:42,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:24:42,243 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:24:42,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:42,449 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:24:42,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:24:42,449 INFO L82 PathProgramCache]: Analyzing trace with hash 206329455, now seen corresponding path program 45 times [2021-05-02 12:24:42,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:24:42,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831736208] [2021-05-02 12:24:42,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:24:42,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:43,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:24:43,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:24:43,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 12:24:43,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:24:43,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831736208] [2021-05-02 12:24:43,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831736208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:43,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1556768404] [2021-05-02 12:24:43,838 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:44,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 12:24:44,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:44,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 12:24:44,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:44,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:44,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:44,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:48,786 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1218 proven. 781 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2021-05-02 12:24:48,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1556768404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:24:48,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:24:48,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 22] total 66 [2021-05-02 12:24:48,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517892071] [2021-05-02 12:24:48,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 12:24:48,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:24:48,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 12:24:48,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=4068, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 12:24:48,788 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:00,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:25:00,153 INFO L93 Difference]: Finished difference Result 174 states and 181 transitions. [2021-05-02 12:25:00,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-05-02 12:25:00,154 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-02 12:25:00,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:25:00,155 INFO L225 Difference]: With dead ends: 174 [2021-05-02 12:25:00,155 INFO L226 Difference]: Without dead ends: 139 [2021-05-02 12:25:00,155 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 123 SyntacticMatches, 13 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2006 ImplicationChecksByTransitivity, 9781.7ms TimeCoverageRelationStatistics Valid=661, Invalid=15851, Unknown=0, NotChecked=0, Total=16512 [2021-05-02 12:25:00,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2021-05-02 12:25:00,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2021-05-02 12:25:00,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 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) [2021-05-02 12:25:00,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 12:25:00,164 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 12:25:00,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:25:00,165 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 12:25:00,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:00,165 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 12:25:00,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 12:25:00,165 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:25:00,165 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:25:00,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 12:25:00,368 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:25:00,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:25:00,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1909778905, now seen corresponding path program 46 times [2021-05-02 12:25:00,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:25:00,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137692076] [2021-05-02 12:25:00,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:25:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:01,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:25:01,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:25:01,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:25:01,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137692076] [2021-05-02 12:25:01,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137692076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:01,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387959100] [2021-05-02 12:25:01,895 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:25:01,953 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:25:01,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:25:01,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 12:25:01,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:25:02,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:02,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:02,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:25:02,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387959100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:02,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:25:02,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 12:25:02,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23860248] [2021-05-02 12:25:02,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:25:02,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:25:02,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:25:02,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:25:02,316 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:07,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:25:07,376 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2021-05-02 12:25:07,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:25:07,377 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 12:25:07,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:25:07,378 INFO L225 Difference]: With dead ends: 178 [2021-05-02 12:25:07,378 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:25:07,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 3904.5ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 12:25:07,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:25:07,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 12:25:07,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 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) [2021-05-02 12:25:07,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 12:25:07,387 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 12:25:07,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:25:07,387 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 12:25:07,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:25:07,388 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 12:25:07,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 12:25:07,388 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:25:07,388 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:25:07,604 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:25:07,604 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:25:07,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:25:07,605 INFO L82 PathProgramCache]: Analyzing trace with hash 180464900, now seen corresponding path program 47 times [2021-05-02 12:25:07,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:25:07,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460627440] [2021-05-02 12:25:07,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:25:07,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:09,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:25:09,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:25:09,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:25:09,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:25:09,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460627440] [2021-05-02 12:25:09,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460627440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:09,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1574320889] [2021-05-02 12:25:09,374 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:25:53,565 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 12:25:53,565 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:25:53,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 116 conjunts are in the unsatisfiable core [2021-05-02 12:25:53,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:25:54,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:54,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:54,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 855 proven. 3192 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:25:54,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1574320889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:54,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:25:54,360 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 59] total 61 [2021-05-02 12:25:54,360 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263262758] [2021-05-02 12:25:54,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 61 states [2021-05-02 12:25:54,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:25:54,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-05-02 12:25:54,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=3491, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 12:25:54,360 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:00,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:26:00,100 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2021-05-02 12:26:00,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 12:26:00,101 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 139 [2021-05-02 12:26:00,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:26:00,101 INFO L225 Difference]: With dead ends: 180 [2021-05-02 12:26:00,101 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 12:26:00,102 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1245 ImplicationChecksByTransitivity, 4725.2ms TimeCoverageRelationStatistics Valid=419, Invalid=11791, Unknown=0, NotChecked=0, Total=12210 [2021-05-02 12:26:00,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 12:26:00,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 12:26:00,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 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) [2021-05-02 12:26:00,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 12:26:00,111 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 12:26:00,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:26:00,111 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 12:26:00,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 61 states, 61 states have (on average 2.081967213114754) internal successors, (127), 60 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:00,111 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 12:26:00,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 12:26:00,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:26:00,112 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:26:00,318 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:00,318 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:26:00,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:26:00,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1139933023, now seen corresponding path program 48 times [2021-05-02 12:26:00,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:26:00,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840170617] [2021-05-02 12:26:00,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:26:00,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:01,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:26:01,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:26:01,825 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:26:01,825 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:26:01,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840170617] [2021-05-02 12:26:01,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840170617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:01,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661606450] [2021-05-02 12:26:01,826 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:26:30,822 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 12:26:30,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:26:30,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:26:30,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:26:30,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:30,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:30,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:30,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:32,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:26:32,433 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1550 proven. 225 refuted. 0 times theorem prover too weak. 2450 trivial. 0 not checked. [2021-05-02 12:26:32,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661606450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:26:32,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:26:32,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18] total 70 [2021-05-02 12:26:32,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80401832] [2021-05-02 12:26:32,434 INFO L460 AbstractCegarLoop]: Interpolant automaton has 70 states [2021-05-02 12:26:32,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:26:32,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-05-02 12:26:32,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=691, Invalid=4139, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:26:32,435 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:26:38,912 WARN L205 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 45 [2021-05-02 12:26:41,394 WARN L205 SmtUtils]: Spent 403.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:26:45,652 WARN L205 SmtUtils]: Spent 575.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 12:26:51,622 WARN L205 SmtUtils]: Spent 792.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 12:26:57,749 WARN L205 SmtUtils]: Spent 377.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 12:27:02,459 WARN L205 SmtUtils]: Spent 908.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:27:05,810 WARN L205 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 12:27:13,021 WARN L205 SmtUtils]: Spent 443.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:27:15,695 WARN L205 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:27:18,404 WARN L205 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:27:20,510 WARN L205 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:27:22,004 WARN L205 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:27:23,367 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:27:24,601 WARN L205 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:27:26,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:26,525 INFO L93 Difference]: Finished difference Result 186 states and 194 transitions. [2021-05-02 12:27:26,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2021-05-02 12:27:26,526 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-02 12:27:26,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:26,527 INFO L225 Difference]: With dead ends: 186 [2021-05-02 12:27:26,527 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 12:27:26,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 141 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2484 ImplicationChecksByTransitivity, 53665.4ms TimeCoverageRelationStatistics Valid=1837, Invalid=17069, Unknown=0, NotChecked=0, Total=18906 [2021-05-02 12:27:26,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 12:27:26,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2021-05-02 12:27:26,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 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) [2021-05-02 12:27:26,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 12:27:26,538 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 141 [2021-05-02 12:27:26,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:26,538 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 12:27:26,538 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 70 states, 70 states have (on average 2.1) internal successors, (147), 69 states have internal predecessors, (147), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:26,538 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 12:27:26,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-05-02 12:27:26,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:26,538 INFO L523 BasicCegarLoop]: trace histogram [67, 51, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:26,744 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 12:27:26,745 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:26,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:26,745 INFO L82 PathProgramCache]: Analyzing trace with hash -106852647, now seen corresponding path program 49 times [2021-05-02 12:27:26,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:26,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595107569] [2021-05-02 12:27:26,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:26,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:28,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:28,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:28,742 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:28,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:28,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595107569] [2021-05-02 12:27:28,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595107569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:28,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024465427] [2021-05-02 12:27:28,743 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:28,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:28,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 353 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 12:27:28,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:27:29,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:29,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:29,275 INFO L134 CoverageAnalysis]: Checked inductivity of 4489 backedges. 1612 proven. 2652 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:29,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024465427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:29,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:29,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 12:27:29,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915002365] [2021-05-02 12:27:29,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 12:27:29,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:29,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 12:27:29,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:27:29,276 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:35,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:35,991 INFO L93 Difference]: Finished difference Result 188 states and 193 transitions. [2021-05-02 12:27:35,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 12:27:35,992 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 145 [2021-05-02 12:27:35,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:35,993 INFO L225 Difference]: With dead ends: 188 [2021-05-02 12:27:35,993 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 12:27:35,994 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 5058.0ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 12:27:35,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 12:27:36,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-02 12:27:36,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 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) [2021-05-02 12:27:36,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 12:27:36,004 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 145 [2021-05-02 12:27:36,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:36,004 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 12:27:36,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:36,004 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 12:27:36,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 12:27:36,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:36,005 INFO L523 BasicCegarLoop]: trace histogram [68, 52, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:36,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:36,205 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:36,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:36,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1739196234, now seen corresponding path program 50 times [2021-05-02 12:27:36,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:36,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694026386] [2021-05-02 12:27:36,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:36,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:38,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:38,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:38,289 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1643 proven. 2756 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:38,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:38,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694026386] [2021-05-02 12:27:38,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694026386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:38,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671400587] [2021-05-02 12:27:38,289 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:38,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:27:38,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:27:38,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 139 conjunts are in the unsatisfiable core [2021-05-02 12:27:38,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:27:40,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:40,038 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 0 proven. 4624 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:27:40,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671400587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:40,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:40,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 71] total 73 [2021-05-02 12:27:40,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028666085] [2021-05-02 12:27:40,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 73 states [2021-05-02 12:27:40,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:40,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-05-02 12:27:40,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=5060, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 12:27:40,039 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:48,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:27:48,965 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-02 12:27:48,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 12:27:48,967 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 147 [2021-05-02 12:27:48,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:27:48,968 INFO L225 Difference]: With dead ends: 190 [2021-05-02 12:27:48,968 INFO L226 Difference]: Without dead ends: 151 [2021-05-02 12:27:48,969 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1414 ImplicationChecksByTransitivity, 6957.4ms TimeCoverageRelationStatistics Valid=461, Invalid=15289, Unknown=0, NotChecked=0, Total=15750 [2021-05-02 12:27:48,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2021-05-02 12:27:48,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2021-05-02 12:27:48,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 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) [2021-05-02 12:27:48,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 12:27:48,982 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 147 [2021-05-02 12:27:48,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:27:48,982 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 12:27:48,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 73 states, 73 states have (on average 2.0547945205479454) internal successors, (150), 72 states have internal predecessors, (150), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:27:48,983 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 12:27:48,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 12:27:48,983 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:27:48,983 INFO L523 BasicCegarLoop]: trace histogram [69, 53, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:27:49,188 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 12:27:49,189 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:27:49,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:27:49,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1536646995, now seen corresponding path program 51 times [2021-05-02 12:27:49,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:27:49,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116768797] [2021-05-02 12:27:49,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:27:49,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:51,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:27:51,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:27:51,402 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1674 proven. 2862 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:27:51,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:27:51,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2116768797] [2021-05-02 12:27:51,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2116768797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:51,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657254740] [2021-05-02 12:27:51,402 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:27:52,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 12:27:52,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:27:52,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 12:27:52,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:27:55,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:27:55,348 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 256 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 12:27:55,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [657254740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:27:55,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:27:55,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 19] total 74 [2021-05-02 12:27:55,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973101172] [2021-05-02 12:27:55,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 12:27:55,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:27:55,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 12:27:55,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=520, Invalid=4882, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 12:27:55,349 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:28:05,164 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 12:28:06,005 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 12:28:07,310 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:28:09,004 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 12:28:11,417 WARN L205 SmtUtils]: Spent 348.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:28:14,755 WARN L205 SmtUtils]: Spent 629.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 12:28:18,667 WARN L205 SmtUtils]: Spent 515.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:28:23,960 WARN L205 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 12:28:31,747 WARN L205 SmtUtils]: Spent 773.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:28:39,876 WARN L205 SmtUtils]: Spent 967.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:28:47,922 WARN L205 SmtUtils]: Spent 703.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:28:54,655 WARN L205 SmtUtils]: Spent 1.17 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 12:29:02,046 WARN L205 SmtUtils]: Spent 1.12 s on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 12:29:05,000 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 12:29:07,249 WARN L205 SmtUtils]: Spent 276.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 12:29:08,480 WARN L205 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 12:29:09,173 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 12:29:09,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:09,895 INFO L93 Difference]: Finished difference Result 196 states and 204 transitions. [2021-05-02 12:29:09,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 12:29:09,897 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2021-05-02 12:29:09,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:09,898 INFO L225 Difference]: With dead ends: 196 [2021-05-02 12:29:09,898 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:29:09,899 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 150 SyntacticMatches, 1 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2672 ImplicationChecksByTransitivity, 72626.7ms TimeCoverageRelationStatistics Valid=1427, Invalid=19743, Unknown=0, NotChecked=0, Total=21170 [2021-05-02 12:29:09,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:29:09,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2021-05-02 12:29:09,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 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) [2021-05-02 12:29:09,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 12:29:09,909 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 149 [2021-05-02 12:29:09,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:09,909 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 12:29:09,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.0945945945945947) internal successors, (155), 73 states have internal predecessors, (155), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:09,910 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 12:29:09,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-05-02 12:29:09,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:09,910 INFO L523 BasicCegarLoop]: trace histogram [71, 54, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:10,113 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 12:29:10,113 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:10,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:10,114 INFO L82 PathProgramCache]: Analyzing trace with hash -142500853, now seen corresponding path program 52 times [2021-05-02 12:29:10,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:10,114 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974998680] [2021-05-02 12:29:10,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:10,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:12,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:12,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:13,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:29:13,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:13,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974998680] [2021-05-02 12:29:13,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [974998680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:13,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743206511] [2021-05-02 12:29:13,002 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:13,060 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:29:13,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:29:13,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 369 conjuncts, 112 conjunts are in the unsatisfiable core [2021-05-02 12:29:13,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:29:13,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:13,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:29:13,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5041 backedges. 1815 proven. 2970 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:29:13,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743206511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:13,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:29:13,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 57] total 59 [2021-05-02 12:29:13,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596914510] [2021-05-02 12:29:13,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 12:29:13,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:29:13,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 12:29:13,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 12:29:13,788 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:24,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:29:24,017 INFO L93 Difference]: Finished difference Result 198 states and 203 transitions. [2021-05-02 12:29:24,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-05-02 12:29:24,018 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 153 [2021-05-02 12:29:24,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:29:24,019 INFO L225 Difference]: With dead ends: 198 [2021-05-02 12:29:24,019 INFO L226 Difference]: Without dead ends: 157 [2021-05-02 12:29:24,020 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 153 SyntacticMatches, 2 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1490 ImplicationChecksByTransitivity, 7281.4ms TimeCoverageRelationStatistics Valid=445, Invalid=12437, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 12:29:24,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-02 12:29:24,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-05-02 12:29:24,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 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) [2021-05-02 12:29:24,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 12:29:24,030 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 153 [2021-05-02 12:29:24,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:29:24,031 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 12:29:24,031 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:29:24,031 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 12:29:24,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2021-05-02 12:29:24,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:29:24,031 INFO L523 BasicCegarLoop]: trace histogram [72, 55, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:29:24,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:29:24,232 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:29:24,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:29:24,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1294935832, now seen corresponding path program 53 times [2021-05-02 12:29:24,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:29:24,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237585876] [2021-05-02 12:29:24,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:29:24,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:27,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:29:27,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:29:27,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1848 proven. 3080 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:29:27,266 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:29:27,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237585876] [2021-05-02 12:29:27,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237585876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:29:27,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439434378] [2021-05-02 12:29:27,267 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:32:52,928 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 73 check-sat command(s) [2021-05-02 12:32:52,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:32:52,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 373 conjuncts, 130 conjunts are in the unsatisfiable core [2021-05-02 12:32:52,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:32:54,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:32:54,448 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:32:54,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5184 backedges. 1088 proven. 4032 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:32:54,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439434378] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:32:54,505 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:32:54,505 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 66] total 68 [2021-05-02 12:32:54,505 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748937739] [2021-05-02 12:32:54,505 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 12:32:54,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:32:54,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 12:32:54,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=4367, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:32:54,506 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 68 states, 68 states have (on average 2.073529411764706) internal successors, (141), 67 states have internal predecessors, (141), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)