/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/array_2-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:04:23,671 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:04:23,674 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:04:23,712 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:04:23,785 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:04:23,786 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:04:23,786 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:04:23,791 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 12:04:23,822 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:04:23,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:04:23,825 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:04:23,825 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:04:23,825 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:04:23,826 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:04:23,826 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:04:23,826 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:04:23,826 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:04:23,826 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:04:23,827 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:04:23,827 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:04:23,827 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:04:23,827 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:04:23,828 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:04:23,828 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:04:23,828 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:04:23,828 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:04:23,828 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:04:23,828 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:04:23,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:04:23,829 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:04:23,829 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:04:23,829 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:04:23,829 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:04:23,829 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:04:23,830 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:04:23,830 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:04:23,830 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:04:24,174 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:04:24,208 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:04:24,210 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:04:24,211 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:04:24,215 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:04:24,215 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-02 12:04:24,264 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49202c6b1/da5ad303670448fbb0b9e00979da6d32/FLAGd83adf675 [2021-05-02 12:04:24,697 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:04:24,698 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_2-1.i [2021-05-02 12:04:24,707 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49202c6b1/da5ad303670448fbb0b9e00979da6d32/FLAGd83adf675 [2021-05-02 12:04:24,723 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49202c6b1/da5ad303670448fbb0b9e00979da6d32 [2021-05-02 12:04:24,725 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:04:24,727 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:04:24,730 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:24,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:04:24,733 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:04:24,733 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,734 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ec3bc61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24, skipping insertion in model container [2021-05-02 12:04:24,734 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,741 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:04:24,753 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:04:24,871 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/array_2-1.i[849,862] [2021-05-02 12:04:24,881 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:24,886 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:04:24,946 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/array_2-1.i[849,862] [2021-05-02 12:04:24,953 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:04:24,964 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:04:24,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24 WrapperNode [2021-05-02 12:04:24,965 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:04:24,966 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:04:24,966 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:04:24,967 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:04:24,973 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,974 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,990 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,993 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,996 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (1/1) ... [2021-05-02 12:04:24,999 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:04:25,000 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:04:25,000 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:04:25,000 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:04:25,000 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (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 12:04:25,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:04:25,054 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:04:25,054 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:04:25,054 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:04:25,054 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:04:25,054 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:04:25,054 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:04:25,055 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 12:04:25,055 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 12:04:25,055 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:04:25,055 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:04:25,055 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 12:04:25,056 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:04:25,056 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:04:25,056 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:04:25,056 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:04:25,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:04:25,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:04:25,057 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:04:25,057 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:04:25,295 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:04:25,295 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 12:04:25,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:25 BoogieIcfgContainer [2021-05-02 12:04:25,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:04:25,297 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:04:25,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:04:25,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:04:25,299 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:04:24" (1/3) ... [2021-05-02 12:04:25,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17a2aeea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:25, skipping insertion in model container [2021-05-02 12:04:25,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:04:24" (2/3) ... [2021-05-02 12:04:25,300 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17a2aeea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:04:25, skipping insertion in model container [2021-05-02 12:04:25,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:04:25" (3/3) ... [2021-05-02 12:04:25,301 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2021-05-02 12:04:25,321 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:04:25,324 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:04:25,357 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:04:25,381 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:04:25,381 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:04:25,381 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:04:25,381 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:04:25,381 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:04:25,381 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:04:25,381 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:04:25,382 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:04:25,397 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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 12:04:25,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:04:25,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:25,401 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:25,401 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:25,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:25,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1954431608, now seen corresponding path program 1 times [2021-05-02 12:04:25,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:25,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947329372] [2021-05-02 12:04:25,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:25,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:25,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:25,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:25,621 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 12:04:25,622 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:25,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947329372] [2021-05-02 12:04:25,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947329372] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:25,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:25,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 12:04:25,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376665880] [2021-05-02 12:04:25,627 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 12:04:25,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:25,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 12:04:25,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:25,638 INFO L87 Difference]: Start difference. First operand has 24 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 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 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 12:04:25,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:25,695 INFO L93 Difference]: Finished difference Result 40 states and 47 transitions. [2021-05-02 12:04:25,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 12:04:25,696 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 14 [2021-05-02 12:04:25,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:25,700 INFO L225 Difference]: With dead ends: 40 [2021-05-02 12:04:25,700 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:04:25,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 12:04:25,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:04:25,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 12:04:25,724 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 12:04:25,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 12:04:25,726 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 14 [2021-05-02 12:04:25,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:25,726 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 12:04:25,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 12:04:25,727 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 12:04:25,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:04:25,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:25,727 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:25,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:04:25,728 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:25,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:25,729 INFO L82 PathProgramCache]: Analyzing trace with hash 301833364, now seen corresponding path program 1 times [2021-05-02 12:04:25,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:25,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306080542] [2021-05-02 12:04:25,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:25,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:25,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:25,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:25,836 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 12:04:25,836 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:25,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306080542] [2021-05-02 12:04:25,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306080542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:04:25,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:04:25,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:04:25,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293669159] [2021-05-02 12:04:25,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:04:25,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:25,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:04:25,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:25,839 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:04:25,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:25,913 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 12:04:25,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:04:25,914 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2021-05-02 12:04:25,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:25,915 INFO L225 Difference]: With dead ends: 30 [2021-05-02 12:04:25,915 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 12:04:25,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:04:25,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 12:04:25,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2021-05-02 12:04:25,918 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 12:04:25,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 12:04:25,919 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 12:04:25,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:25,919 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 12:04:25,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 12:04:25,919 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 12:04:25,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 12:04:25,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:25,920 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:25,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:04:25,920 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:25,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:25,920 INFO L82 PathProgramCache]: Analyzing trace with hash 1319589272, now seen corresponding path program 1 times [2021-05-02 12:04:25,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:25,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250833024] [2021-05-02 12:04:25,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:25,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:25,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:25,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:26,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:04:26,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:26,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250833024] [2021-05-02 12:04:26,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250833024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:26,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271344414] [2021-05-02 12:04:26,003 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 12:04:26,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:26,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 12:04:26,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:26,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,173 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 12:04:26,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271344414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:26,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:26,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 12:04:26,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879814527] [2021-05-02 12:04:26,174 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 12:04:26,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:26,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 12:04:26,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:04:26,175 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 12:04:26,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:26,231 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 12:04:26,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 12:04:26,232 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 18 [2021-05-02 12:04:26,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:26,233 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:04:26,233 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 12:04:26,233 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 35.2ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 12:04:26,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 12:04:26,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2021-05-02 12:04:26,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 states have internal predecessors, (20), 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 12:04:26,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-05-02 12:04:26,238 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2021-05-02 12:04:26,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:26,239 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-05-02 12:04:26,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 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 12:04:26,239 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-05-02 12:04:26,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 12:04:26,240 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:26,240 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:26,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:04:26,457 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:26,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:26,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1327365276, now seen corresponding path program 2 times [2021-05-02 12:04:26,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:26,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [645806701] [2021-05-02 12:04:26,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:26,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:26,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:26,598 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:04:26,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:26,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [645806701] [2021-05-02 12:04:26,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [645806701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:26,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [333931296] [2021-05-02 12:04:26,599 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 12:04:26,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:26,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:26,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 12:04:26,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:26,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:26,769 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 12:04:26,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [333931296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:26,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:26,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 12:04:26,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649559908] [2021-05-02 12:04:26,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 12:04:26,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:26,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 12:04:26,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:26,772 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 12:04:26,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:26,835 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 12:04:26,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 12:04:26,836 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 22 [2021-05-02 12:04:26,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:26,837 INFO L225 Difference]: With dead ends: 41 [2021-05-02 12:04:26,837 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 12:04:26,838 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 12:04:26,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 12:04:26,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-05-02 12:04:26,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 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 12:04:26,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 12:04:26,847 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 22 [2021-05-02 12:04:26,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:26,848 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 12:04:26,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 12:04:26,848 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 12:04:26,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 12:04:26,849 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:26,849 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:27,069 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:27,069 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:27,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:27,070 INFO L82 PathProgramCache]: Analyzing trace with hash -2060021344, now seen corresponding path program 3 times [2021-05-02 12:04:27,070 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:27,070 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467332972] [2021-05-02 12:04:27,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:27,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:27,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:27,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:27,126 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:04:27,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:27,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467332972] [2021-05-02 12:04:27,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467332972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:27,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885425991] [2021-05-02 12:04:27,126 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 12:04:27,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 12:04:27,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:27,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 12:04:27,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:27,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,234 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 12:04:27,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885425991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:27,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:27,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:04:27,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920663] [2021-05-02 12:04:27,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:04:27,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:27,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:04:27,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:27,235 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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 12:04:27,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:27,318 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-02 12:04:27,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:04:27,319 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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 26 [2021-05-02 12:04:27,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:27,320 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:04:27,320 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 12:04:27,320 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 32.3ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:04:27,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 12:04:27,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 12:04:27,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 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 12:04:27,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 12:04:27,324 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 26 [2021-05-02 12:04:27,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:27,325 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 12:04:27,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.875) internal successors, (31), 7 states have internal predecessors, (31), 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 12:04:27,325 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 12:04:27,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 12:04:27,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:27,326 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:27,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:27,528 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:27,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:27,529 INFO L82 PathProgramCache]: Analyzing trace with hash -515500892, now seen corresponding path program 4 times [2021-05-02 12:04:27,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:27,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857101794] [2021-05-02 12:04:27,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:27,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:27,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:27,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:27,678 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:04:27,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:27,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857101794] [2021-05-02 12:04:27,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857101794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:27,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662116412] [2021-05-02 12:04:27,679 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 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 12:04:27,771 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:27,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:27,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 12:04:27,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:27,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:27,857 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 12:04:27,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662116412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:27,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:27,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:04:27,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687427675] [2021-05-02 12:04:27,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:04:27,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:27,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:04:27,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:27,858 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 12:04:27,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:27,914 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2021-05-02 12:04:27,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:04:27,915 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 30 [2021-05-02 12:04:27,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:27,916 INFO L225 Difference]: With dead ends: 53 [2021-05-02 12:04:27,916 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 12:04:27,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 46.1ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:04:27,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 12:04:27,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-05-02 12:04:27,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.0666666666666667) internal successors, (32), 30 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 12:04:27,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2021-05-02 12:04:27,919 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 30 [2021-05-02 12:04:27,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:27,920 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2021-05-02 12:04:27,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 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 12:04:27,920 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2021-05-02 12:04:27,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 12:04:27,920 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:27,921 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:28,141 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:28,142 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:28,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:28,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1377928616, now seen corresponding path program 5 times [2021-05-02 12:04:28,142 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:28,142 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784421042] [2021-05-02 12:04:28,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:28,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:28,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:28,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:28,229 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:04:28,229 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:28,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784421042] [2021-05-02 12:04:28,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784421042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:28,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [353296039] [2021-05-02 12:04:28,229 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 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 12:04:28,609 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 12:04:28,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:28,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:04:28,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:28,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:28,695 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 12:04:28,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [353296039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:28,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:28,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:04:28,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960728292] [2021-05-02 12:04:28,696 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:04:28,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:28,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:04:28,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:28,696 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 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 12:04:28,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:28,769 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2021-05-02 12:04:28,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:04:28,770 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 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 34 [2021-05-02 12:04:28,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:28,770 INFO L225 Difference]: With dead ends: 59 [2021-05-02 12:04:28,770 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 12:04:28,770 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 46.0ms TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:04:28,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 12:04:28,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-05-02 12:04:28,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.0588235294117647) internal successors, (36), 34 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 12:04:28,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2021-05-02 12:04:28,773 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 34 [2021-05-02 12:04:28,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:28,774 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2021-05-02 12:04:28,774 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.9) internal successors, (39), 9 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 12:04:28,774 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2021-05-02 12:04:28,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:04:28,774 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:28,774 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:28,993 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:04:28,994 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:28,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:28,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1159586988, now seen corresponding path program 6 times [2021-05-02 12:04:28,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:28,994 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057741041] [2021-05-02 12:04:28,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:29,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,063 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:04:29,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:29,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057741041] [2021-05-02 12:04:29,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057741041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965631396] [2021-05-02 12:04:29,063 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 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 12:04:29,282 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 12:04:29,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:29,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 12:04:29,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:29,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,362 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 12:04:29,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965631396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:29,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:04:29,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698162846] [2021-05-02 12:04:29,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:04:29,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:29,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:04:29,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:29,363 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 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 12:04:29,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:29,431 INFO L93 Difference]: Finished difference Result 65 states and 68 transitions. [2021-05-02 12:04:29,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:04:29,431 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 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 38 [2021-05-02 12:04:29,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:29,431 INFO L225 Difference]: With dead ends: 65 [2021-05-02 12:04:29,432 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:04:29,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 46.4ms TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:04:29,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:04:29,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 12:04:29,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 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 12:04:29,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2021-05-02 12:04:29,435 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 38 [2021-05-02 12:04:29,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:29,435 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2021-05-02 12:04:29,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 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 12:04:29,435 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2021-05-02 12:04:29,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 12:04:29,436 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:29,436 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:29,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:29,652 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:29,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:29,653 INFO L82 PathProgramCache]: Analyzing trace with hash 638595504, now seen corresponding path program 7 times [2021-05-02 12:04:29,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:29,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039455305] [2021-05-02 12:04:29,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:29,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,751 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:04:29,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:29,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039455305] [2021-05-02 12:04:29,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039455305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806863465] [2021-05-02 12:04:29,752 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 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 12:04:29,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:29,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:04:29,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:29,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:29,949 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 12:04:29,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806863465] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:29,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:29,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:04:29,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080108283] [2021-05-02 12:04:29,950 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:04:29,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:29,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:04:29,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:29,951 INFO L87 Difference]: Start difference. First operand 43 states and 44 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 12:04:30,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:30,029 INFO L93 Difference]: Finished difference Result 71 states and 74 transitions. [2021-05-02 12:04:30,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:04:30,030 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 42 [2021-05-02 12:04:30,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:30,030 INFO L225 Difference]: With dead ends: 71 [2021-05-02 12:04:30,031 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 12:04:30,031 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 63.6ms TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:04:30,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 12:04:30,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 12:04:30,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 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 12:04:30,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 48 transitions. [2021-05-02 12:04:30,034 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 48 transitions. Word has length 42 [2021-05-02 12:04:30,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:30,034 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 48 transitions. [2021-05-02 12:04:30,034 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 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 12:04:30,034 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 48 transitions. [2021-05-02 12:04:30,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 12:04:30,035 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:30,035 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:30,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,254 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:30,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:30,254 INFO L82 PathProgramCache]: Analyzing trace with hash -548574028, now seen corresponding path program 8 times [2021-05-02 12:04:30,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:30,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420712389] [2021-05-02 12:04:30,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:30,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:30,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,333 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:04:30,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:30,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420712389] [2021-05-02 12:04:30,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420712389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552229305] [2021-05-02 12:04:30,334 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:30,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:04:30,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:30,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:04:30,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:30,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:30,513 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 12:04:30,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552229305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:30,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:04:30,514 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541129367] [2021-05-02 12:04:30,514 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:04:30,514 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:30,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:04:30,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:30,515 INFO L87 Difference]: Start difference. First operand 47 states and 48 transitions. Second operand has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 12:04:30,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:30,579 INFO L93 Difference]: Finished difference Result 77 states and 80 transitions. [2021-05-02 12:04:30,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:04:30,580 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 46 [2021-05-02 12:04:30,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:30,580 INFO L225 Difference]: With dead ends: 77 [2021-05-02 12:04:30,580 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 12:04:30,581 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 54.1ms TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:04:30,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 12:04:30,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 12:04:30,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.0434782608695652) internal successors, (48), 46 states have internal predecessors, (48), 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 12:04:30,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 12:04:30,584 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 46 [2021-05-02 12:04:30,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:30,584 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 12:04:30,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.4615384615384617) internal successors, (32), 12 states have internal predecessors, (32), 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 12:04:30,584 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 12:04:30,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 12:04:30,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:30,584 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:30,802 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:04:30,802 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:30,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:30,802 INFO L82 PathProgramCache]: Analyzing trace with hash 1504351672, now seen corresponding path program 9 times [2021-05-02 12:04:30,803 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:30,803 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927754590] [2021-05-02 12:04:30,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:30,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:30,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:30,917 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:04:30,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:30,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927754590] [2021-05-02 12:04:30,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927754590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:30,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866688281] [2021-05-02 12:04:30,918 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 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 12:04:31,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 12:04:31,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:31,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:04:31,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:31,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:31,632 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 12:04:31,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866688281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:31,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:31,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:04:31,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999382405] [2021-05-02 12:04:31,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:04:31,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:31,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:04:31,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:31,634 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 12:04:31,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:31,708 INFO L93 Difference]: Finished difference Result 83 states and 86 transitions. [2021-05-02 12:04:31,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:04:31,709 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 50 [2021-05-02 12:04:31,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:31,709 INFO L225 Difference]: With dead ends: 83 [2021-05-02 12:04:31,709 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 12:04:31,709 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 84.7ms TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:04:31,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 12:04:31,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 12:04:31,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.04) internal successors, (52), 50 states have internal predecessors, (52), 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 12:04:31,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 56 transitions. [2021-05-02 12:04:31,713 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 56 transitions. Word has length 50 [2021-05-02 12:04:31,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:31,713 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 56 transitions. [2021-05-02 12:04:31,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.9285714285714284) internal successors, (55), 13 states have internal predecessors, (55), 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 12:04:31,713 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 56 transitions. [2021-05-02 12:04:31,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 12:04:31,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:31,713 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:31,931 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:31,931 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:31,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:31,932 INFO L82 PathProgramCache]: Analyzing trace with hash -58938180, now seen corresponding path program 10 times [2021-05-02 12:04:31,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:31,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320806221] [2021-05-02 12:04:31,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:31,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:32,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,033 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:04:32,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:32,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320806221] [2021-05-02 12:04:32,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320806221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896470784] [2021-05-02 12:04:32,033 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 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 12:04:32,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:04:32,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:32,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 12:04:32,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:32,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,116 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:32,162 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 12:04:32,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896470784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:32,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 12:04:32,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782632430] [2021-05-02 12:04:32,163 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 12:04:32,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:32,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 12:04:32,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:32,163 INFO L87 Difference]: Start difference. First operand 55 states and 56 transitions. Second operand has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 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 12:04:32,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:32,269 INFO L93 Difference]: Finished difference Result 89 states and 92 transitions. [2021-05-02 12:04:32,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:04:32,269 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 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 54 [2021-05-02 12:04:32,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:32,270 INFO L225 Difference]: With dead ends: 89 [2021-05-02 12:04:32,270 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 12:04:32,270 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 70.4ms TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2021-05-02 12:04:32,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 12:04:32,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 59. [2021-05-02 12:04:32,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.037037037037037) internal successors, (56), 54 states have internal predecessors, (56), 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 12:04:32,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2021-05-02 12:04:32,274 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 54 [2021-05-02 12:04:32,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:32,274 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2021-05-02 12:04:32,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.4) internal successors, (36), 14 states have internal predecessors, (36), 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 12:04:32,274 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2021-05-02 12:04:32,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-05-02 12:04:32,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:32,275 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:32,491 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:04:32,491 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:32,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:32,492 INFO L82 PathProgramCache]: Analyzing trace with hash 764981696, now seen corresponding path program 11 times [2021-05-02 12:04:32,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:32,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59496238] [2021-05-02 12:04:32,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:32,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:32,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:32,602 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:04:32,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:32,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59496238] [2021-05-02 12:04:32,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59496238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:32,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883705032] [2021-05-02 12:04:32,602 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 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 12:04:57,540 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 12:04:57,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:04:57,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:04:57,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:04:57,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:04:57,664 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:04:57,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883705032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:57,664 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:04:57,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 12:04:57,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684102376] [2021-05-02 12:04:57,665 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:04:57,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:04:57,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:04:57,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:04:57,665 INFO L87 Difference]: Start difference. First operand 59 states and 60 transitions. Second operand has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 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 12:04:57,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:04:57,746 INFO L93 Difference]: Finished difference Result 95 states and 98 transitions. [2021-05-02 12:04:57,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 12:04:57,746 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 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 58 [2021-05-02 12:04:57,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:04:57,747 INFO L225 Difference]: With dead ends: 95 [2021-05-02 12:04:57,747 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 12:04:57,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 79.8ms TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:04:57,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 12:04:57,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-05-02 12:04:57,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 58 states have internal predecessors, (60), 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 12:04:57,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2021-05-02 12:04:57,751 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 58 [2021-05-02 12:04:57,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:04:57,751 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2021-05-02 12:04:57,751 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.9375) internal successors, (63), 15 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 12:04:57,751 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2021-05-02 12:04:57,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 12:04:57,751 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:04:57,751 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:04:57,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 12:04:57,977 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:04:57,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:04:57,977 INFO L82 PathProgramCache]: Analyzing trace with hash -783047484, now seen corresponding path program 12 times [2021-05-02 12:04:57,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:04:57,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [649872644] [2021-05-02 12:04:57,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:04:57,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:58,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:04:58,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:04:58,125 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 12:04:58,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:04:58,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [649872644] [2021-05-02 12:04:58,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [649872644] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:04:58,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133230588] [2021-05-02 12:04:58,126 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 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 12:05:06,311 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 12:05:06,312 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:06,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 12:05:06,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:06,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:06,458 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 23 proven. 144 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 12:05:06,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133230588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:06,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:06,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17] total 19 [2021-05-02 12:05:06,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359077878] [2021-05-02 12:05:06,459 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:06,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:06,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:06,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:06,459 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 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 12:05:06,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:06,551 INFO L93 Difference]: Finished difference Result 103 states and 108 transitions. [2021-05-02 12:05:06,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:06,551 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 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 62 [2021-05-02 12:05:06,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:06,555 INFO L225 Difference]: With dead ends: 103 [2021-05-02 12:05:06,555 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:05:06,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 114.1ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:06,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:05:06,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 12:05:06,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0303030303030303) internal successors, (68), 66 states have internal predecessors, (68), 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 12:05:06,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 12:05:06,569 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 62 [2021-05-02 12:05:06,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:06,570 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 12:05:06,570 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.6315789473684212) internal successors, (69), 18 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 12:05:06,570 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 12:05:06,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 12:05:06,570 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:06,571 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:06,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:05:06,771 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:06,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:06,773 INFO L82 PathProgramCache]: Analyzing trace with hash 2054837452, now seen corresponding path program 13 times [2021-05-02 12:05:06,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:06,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088150955] [2021-05-02 12:05:06,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:06,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:07,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,014 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:05:07,014 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:07,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088150955] [2021-05-02 12:05:07,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1088150955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599329069] [2021-05-02 12:05:07,014 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 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 12:05:07,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:05:07,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:07,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,188 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 12:05:07,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [599329069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:07,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:05:07,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143019685] [2021-05-02 12:05:07,189 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:05:07,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:07,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:05:07,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:07,190 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 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 12:05:07,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:07,328 INFO L93 Difference]: Finished difference Result 113 states and 116 transitions. [2021-05-02 12:05:07,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:05:07,328 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 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 70 [2021-05-02 12:05:07,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:07,329 INFO L225 Difference]: With dead ends: 113 [2021-05-02 12:05:07,329 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 12:05:07,329 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 157.1ms TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:05:07,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 12:05:07,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 12:05:07,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 70 states have internal predecessors, (72), 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 12:05:07,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2021-05-02 12:05:07,333 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 70 [2021-05-02 12:05:07,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:07,333 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2021-05-02 12:05:07,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.3157894736842106) internal successors, (44), 18 states have internal predecessors, (44), 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 12:05:07,333 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2021-05-02 12:05:07,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 12:05:07,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:07,334 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:07,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:05:07,541 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:07,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:07,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1091572176, now seen corresponding path program 14 times [2021-05-02 12:05:07,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:07,542 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305251230] [2021-05-02 12:05:07,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:07,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:07,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:07,788 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:05:07,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:07,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305251230] [2021-05-02 12:05:07,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [305251230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435174933] [2021-05-02 12:05:07,788 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:07,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:05:07,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:07,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:05:07,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:07,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:07,991 INFO L134 CoverageAnalysis]: Checked inductivity of 450 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 12:05:07,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435174933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:07,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:07,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 12:05:07,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597894943] [2021-05-02 12:05:07,992 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 12:05:07,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:07,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 12:05:07,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:07,993 INFO L87 Difference]: Start difference. First operand 75 states and 76 transitions. Second operand has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 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 12:05:08,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:08,102 INFO L93 Difference]: Finished difference Result 119 states and 122 transitions. [2021-05-02 12:05:08,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 12:05:08,102 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 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 74 [2021-05-02 12:05:08,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:08,103 INFO L225 Difference]: With dead ends: 119 [2021-05-02 12:05:08,103 INFO L226 Difference]: Without dead ends: 81 [2021-05-02 12:05:08,103 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 154.8ms TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:05:08,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-05-02 12:05:08,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2021-05-02 12:05:08,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.027027027027027) internal successors, (76), 74 states have internal predecessors, (76), 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 12:05:08,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 80 transitions. [2021-05-02 12:05:08,123 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 80 transitions. Word has length 74 [2021-05-02 12:05:08,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:08,123 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 80 transitions. [2021-05-02 12:05:08,123 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.3) internal successors, (46), 19 states have internal predecessors, (46), 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 12:05:08,123 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 80 transitions. [2021-05-02 12:05:08,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 12:05:08,124 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:08,124 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:08,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:08,337 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:08,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:08,337 INFO L82 PathProgramCache]: Analyzing trace with hash -57099052, now seen corresponding path program 15 times [2021-05-02 12:05:08,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:08,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164027796] [2021-05-02 12:05:08,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:08,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:08,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:08,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:08,527 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:05:08,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:08,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164027796] [2021-05-02 12:05:08,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164027796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:08,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651476329] [2021-05-02 12:05:08,527 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 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 12:05:20,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 12:05:20,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:20,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 12:05:20,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:20,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,178 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,267 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 12:05:20,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651476329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:20,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:20,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 12:05:20,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181675502] [2021-05-02 12:05:20,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 12:05:20,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:20,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 12:05:20,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:20,268 INFO L87 Difference]: Start difference. First operand 79 states and 80 transitions. Second operand has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 12:05:20,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:20,377 INFO L93 Difference]: Finished difference Result 125 states and 128 transitions. [2021-05-02 12:05:20,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:05:20,377 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 78 [2021-05-02 12:05:20,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:20,378 INFO L225 Difference]: With dead ends: 125 [2021-05-02 12:05:20,378 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 12:05:20,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 160.8ms TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2021-05-02 12:05:20,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 12:05:20,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 12:05:20,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0256410256410255) internal successors, (80), 78 states have internal predecessors, (80), 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 12:05:20,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2021-05-02 12:05:20,382 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 78 [2021-05-02 12:05:20,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:20,382 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2021-05-02 12:05:20,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.2857142857142856) internal successors, (48), 20 states have internal predecessors, (48), 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 12:05:20,382 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2021-05-02 12:05:20,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 12:05:20,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:20,383 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:20,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 12:05:20,609 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:20,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:20,609 INFO L82 PathProgramCache]: Analyzing trace with hash -1981196840, now seen corresponding path program 16 times [2021-05-02 12:05:20,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:20,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090573870] [2021-05-02 12:05:20,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:20,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:20,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:20,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:20,816 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 12:05:20,816 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:20,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090573870] [2021-05-02 12:05:20,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090573870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:20,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206860250] [2021-05-02 12:05:20,817 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:05:20,885 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:05:20,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:05:20,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:05:20,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:05:20,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:20,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:05:21,049 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2021-05-02 12:05:21,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206860250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:21,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:05:21,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 12:05:21,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497434789] [2021-05-02 12:05:21,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 12:05:21,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:05:21,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 12:05:21,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:21,050 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 12:05:21,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:05:21,179 INFO L93 Difference]: Finished difference Result 131 states and 134 transitions. [2021-05-02 12:05:21,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 12:05:21,179 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 82 [2021-05-02 12:05:21,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:05:21,180 INFO L225 Difference]: With dead ends: 131 [2021-05-02 12:05:21,180 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:05:21,181 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 153.5ms TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:05:21,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:05:21,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2021-05-02 12:05:21,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 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 12:05:21,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 88 transitions. [2021-05-02 12:05:21,186 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 88 transitions. Word has length 82 [2021-05-02 12:05:21,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:05:21,187 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 88 transitions. [2021-05-02 12:05:21,187 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.272727272727273) internal successors, (50), 21 states have internal predecessors, (50), 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 12:05:21,187 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 88 transitions. [2021-05-02 12:05:21,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 12:05:21,188 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:05:21,189 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:05:21,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:05:21,407 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:05:21,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:05:21,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1146543324, now seen corresponding path program 17 times [2021-05-02 12:05:21,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:05:21,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876618304] [2021-05-02 12:05:21,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:05:21,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:21,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:05:21,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:05:21,609 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2021-05-02 12:05:21,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:05:21,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876618304] [2021-05-02 12:05:21,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876618304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:05:21,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176357315] [2021-05-02 12:05:21,609 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 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