/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:54:19,595 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:54:19,597 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:54:19,619 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:54:19,636 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:54:19,638 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:54:19,639 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:54:19,640 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:54:19,641 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:54:19,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:54:19,645 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:54:19,649 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:54:19,650 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:54:19,650 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:54:19,652 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:54:19,653 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:54:19,657 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:54:19,663 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:54:19,664 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:54:19,664 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:54:19,665 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 13:54:19,697 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:54:19,697 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:54:19,699 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:54:19,699 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:54:19,700 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:54:19,700 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:54:19,700 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:54:19,700 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:54:19,700 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:54:19,700 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:54:19,701 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:54:19,701 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:54:19,701 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:54:19,701 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:54:19,701 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:54:19,702 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:54:19,702 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:54:19,702 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:54:19,702 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:54:19,716 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:54:19,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:54:19,717 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:54:19,717 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:54:19,717 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:54:19,956 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:54:19,968 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:54:19,969 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:54:19,970 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:54:19,970 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:54:19,971 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound10.c [2021-05-02 13:54:20,020 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d275ce408/1c10149ea79d477cb0b614e323dc7a16/FLAGe1e52c4cf [2021-05-02 13:54:20,322 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:54:20,322 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound10.c [2021-05-02 13:54:20,330 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d275ce408/1c10149ea79d477cb0b614e323dc7a16/FLAGe1e52c4cf [2021-05-02 13:54:20,741 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d275ce408/1c10149ea79d477cb0b614e323dc7a16 [2021-05-02 13:54:20,743 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:54:20,744 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:54:20,745 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:54:20,745 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:54:20,747 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:54:20,748 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,749 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51758dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20, skipping insertion in model container [2021-05-02 13:54:20,749 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,753 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:54:20,763 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:54:20,849 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound10.c[596,609] [2021-05-02 13:54:20,863 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:54:20,870 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:54:20,879 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound10.c[596,609] [2021-05-02 13:54:20,888 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:54:20,898 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:54:20,898 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20 WrapperNode [2021-05-02 13:54:20,899 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:54:20,899 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:54:20,900 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:54:20,900 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:54:20,915 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,921 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,940 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,940 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,943 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,958 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,959 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (1/1) ... [2021-05-02 13:54:20,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:54:20,961 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:54:20,961 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:54:20,961 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:54:20,961 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (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 13:54:21,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:54:21,125 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:54:21,125 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:54:21,125 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:54:21,125 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:54:21,125 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:54:21,125 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:54:21,126 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:54:21,126 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:54:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:54:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_short [2021-05-02 13:54:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:54:21,127 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:54:21,128 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:54:21,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:54:21,366 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:54:21,366 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:54:21,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:54:21 BoogieIcfgContainer [2021-05-02 13:54:21,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:54:21,384 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:54:21,384 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:54:21,386 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:54:21,386 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:54:20" (1/3) ... [2021-05-02 13:54:21,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4794e49b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:54:21, skipping insertion in model container [2021-05-02 13:54:21,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:54:20" (2/3) ... [2021-05-02 13:54:21,387 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4794e49b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:54:21, skipping insertion in model container [2021-05-02 13:54:21,387 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:54:21" (3/3) ... [2021-05-02 13:54:21,388 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound10.c [2021-05-02 13:54:21,391 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:54:21,394 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:54:21,420 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:54:21,450 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:54:21,450 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:54:21,450 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:54:21,450 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:54:21,451 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:54:21,451 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:54:21,451 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:54:21,451 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:54:21,473 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 13:54:21,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:54:21,476 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:21,476 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:21,477 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:21,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:21,480 INFO L82 PathProgramCache]: Analyzing trace with hash 1839589780, now seen corresponding path program 1 times [2021-05-02 13:54:21,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:21,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950415891] [2021-05-02 13:54:21,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:21,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:21,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:54:21,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:21,743 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 13:54:21,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:21,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950415891] [2021-05-02 13:54:21,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950415891] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:54:21,744 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:54:21,744 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:54:21,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55354439] [2021-05-02 13:54:21,748 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:54:21,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:21,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:54:21,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:54:21,761 INFO L87 Difference]: Start difference. First operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:54:21,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:21,905 INFO L93 Difference]: Finished difference Result 57 states and 95 transitions. [2021-05-02 13:54:21,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:54:21,906 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:54:21,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:21,911 INFO L225 Difference]: With dead ends: 57 [2021-05-02 13:54:21,911 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:54:21,913 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 68.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:54:21,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:54:21,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 13:54:21,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:54:21,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-05-02 13:54:21,941 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 11 [2021-05-02 13:54:21,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:21,941 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-05-02 13:54:21,941 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:54:21,941 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-05-02 13:54:21,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:54:21,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:21,942 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:21,942 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:54:21,942 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:21,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:21,942 INFO L82 PathProgramCache]: Analyzing trace with hash 660459433, now seen corresponding path program 1 times [2021-05-02 13:54:21,943 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:21,943 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576962870] [2021-05-02 13:54:21,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:21,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:22,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:54:22,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:22,052 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 13:54:22,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:22,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576962870] [2021-05-02 13:54:22,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576962870] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:54:22,053 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:54:22,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:54:22,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693704999] [2021-05-02 13:54:22,054 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:54:22,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:22,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:54:22,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:54:22,056 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 13:54:22,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:22,213 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2021-05-02 13:54:22,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:54:22,214 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:54:22,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:22,215 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:54:22,215 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:54:22,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 58.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:54:22,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:54:22,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 13:54:22,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:54:22,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-02 13:54:22,230 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-05-02 13:54:22,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:22,230 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-02 13:54:22,230 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 13:54:22,230 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-02 13:54:22,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:54:22,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:22,231 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:22,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:54:22,231 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:22,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:22,231 INFO L82 PathProgramCache]: Analyzing trace with hash 662008565, now seen corresponding path program 1 times [2021-05-02 13:54:22,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:22,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828739397] [2021-05-02 13:54:22,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:22,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:22,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:54:22,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:22,346 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 13:54:22,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:22,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828739397] [2021-05-02 13:54:22,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828739397] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:54:22,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:54:22,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:54:22,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112240706] [2021-05-02 13:54:22,347 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:54:22,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:22,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:54:22,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:54:22,348 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:54:22,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:22,585 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-02 13:54:22,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:54:22,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 13:54:22,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:22,588 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:54:22,588 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:54:22,588 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 147.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:22,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:54:22,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:54:22,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 13:54:22,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 13:54:22,610 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-02 13:54:22,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:22,611 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 13:54:22,611 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:54:22,611 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 13:54:22,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:54:22,611 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:22,612 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:22,612 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:54:22,612 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:22,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:22,612 INFO L82 PathProgramCache]: Analyzing trace with hash 2023221563, now seen corresponding path program 1 times [2021-05-02 13:54:22,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:22,613 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896064491] [2021-05-02 13:54:22,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:22,622 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:22,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [443333826] [2021-05-02 13:54:22,622 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 13:54:22,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:22,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:54:22,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:22,783 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:54:22,783 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:22,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896064491] [2021-05-02 13:54:22,783 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:22,783 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443333826] [2021-05-02 13:54:22,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443333826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:22,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:22,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:54:22,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133648356] [2021-05-02 13:54:22,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:54:22,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:22,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:54:22,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:54:22,785 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:54:22,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:22,947 INFO L93 Difference]: Finished difference Result 54 states and 73 transitions. [2021-05-02 13:54:22,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:54:22,947 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2021-05-02 13:54:22,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:22,949 INFO L225 Difference]: With dead ends: 54 [2021-05-02 13:54:22,950 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:54:22,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 41.4ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:22,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:54:22,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:54:22,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 23 states have call successors, (23), 6 states have call predecessors, (23), 5 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:54:22,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 70 transitions. [2021-05-02 13:54:22,964 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 70 transitions. Word has length 17 [2021-05-02 13:54:22,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:22,964 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 70 transitions. [2021-05-02 13:54:22,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:54:22,965 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 70 transitions. [2021-05-02 13:54:22,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 13:54:22,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:22,965 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:23,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:23,181 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:23,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:23,181 INFO L82 PathProgramCache]: Analyzing trace with hash 1612678773, now seen corresponding path program 1 times [2021-05-02 13:54:23,181 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:23,181 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [942214160] [2021-05-02 13:54:23,181 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:23,187 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:23,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1614888769] [2021-05-02 13:54:23,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:23,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:23,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:54:23,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:23,334 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:54:23,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:23,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [942214160] [2021-05-02 13:54:23,334 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:23,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1614888769] [2021-05-02 13:54:23,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1614888769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:23,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:23,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:54:23,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246251044] [2021-05-02 13:54:23,335 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:54:23,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:23,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:54:23,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:54:23,336 INFO L87 Difference]: Start difference. First operand 51 states and 70 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:54:23,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:23,526 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2021-05-02 13:54:23,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:54:23,527 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-05-02 13:54:23,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:23,528 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:54:23,528 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:54:23,528 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 49.9ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:23,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:54:23,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:54:23,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 25 states have (on average 1.16) internal successors, (29), 27 states have internal predecessors, (29), 23 states have call successors, (23), 7 states have call predecessors, (23), 6 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 13:54:23,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 73 transitions. [2021-05-02 13:54:23,536 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 73 transitions. Word has length 22 [2021-05-02 13:54:23,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:23,536 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 73 transitions. [2021-05-02 13:54:23,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:54:23,537 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 73 transitions. [2021-05-02 13:54:23,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:54:23,537 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:23,537 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:23,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:23,753 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:23,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:23,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1625830715, now seen corresponding path program 1 times [2021-05-02 13:54:23,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:23,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [669679719] [2021-05-02 13:54:23,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:23,769 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:23,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [51095024] [2021-05-02 13:54:23,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:23,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:23,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:54:23,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:23,927 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:54:23,928 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:23,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [669679719] [2021-05-02 13:54:23,928 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:23,928 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51095024] [2021-05-02 13:54:23,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51095024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:23,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:23,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:54:23,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138250841] [2021-05-02 13:54:23,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:54:23,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:23,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:54:23,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:54:23,929 INFO L87 Difference]: Start difference. First operand 55 states and 73 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:54:24,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:24,128 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2021-05-02 13:54:24,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:54:24,129 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 13:54:24,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:24,130 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:54:24,130 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 13:54:24,132 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 40.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:24,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 13:54:24,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-05-02 13:54:24,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:54:24,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 65 transitions. [2021-05-02 13:54:24,148 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 65 transitions. Word has length 27 [2021-05-02 13:54:24,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:24,149 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 65 transitions. [2021-05-02 13:54:24,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 13:54:24,149 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 65 transitions. [2021-05-02 13:54:24,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:54:24,150 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:24,150 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:24,365 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:24,365 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:24,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:24,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1440923632, now seen corresponding path program 1 times [2021-05-02 13:54:24,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:24,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255023427] [2021-05-02 13:54:24,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:24,371 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:24,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1828099485] [2021-05-02 13:54:24,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:24,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:24,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:54:24,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:24,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:24,494 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-05-02 13:54:24,495 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:24,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255023427] [2021-05-02 13:54:24,495 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:24,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828099485] [2021-05-02 13:54:24,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828099485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:24,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:24,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 13:54:24,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353017155] [2021-05-02 13:54:24,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:54:24,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:24,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:54:24,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:54:24,496 INFO L87 Difference]: Start difference. First operand 54 states and 65 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:54:24,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:24,525 INFO L93 Difference]: Finished difference Result 72 states and 87 transitions. [2021-05-02 13:54:24,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:54:24,526 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:54:24,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:24,526 INFO L225 Difference]: With dead ends: 72 [2021-05-02 13:54:24,526 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:54:24,527 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:54:24,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:54:24,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 13:54:24,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:54:24,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 13:54:24,531 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 45 [2021-05-02 13:54:24,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:24,531 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 13:54:24,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 4 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:54:24,532 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 13:54:24,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:54:24,532 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:24,532 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:24,748 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:24,749 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:24,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:24,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1933038948, now seen corresponding path program 1 times [2021-05-02 13:54:24,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:24,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293026040] [2021-05-02 13:54:24,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:24,757 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:24,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2266375] [2021-05-02 13:54:24,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:24,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:24,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:54:24,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:25,010 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 26 proven. 5 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 13:54:25,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:25,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293026040] [2021-05-02 13:54:25,011 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:25,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2266375] [2021-05-02 13:54:25,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2266375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:25,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:25,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:54:25,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751538596] [2021-05-02 13:54:25,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:54:25,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:25,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:54:25,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:54:25,013 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:54:25,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:25,228 INFO L93 Difference]: Finished difference Result 78 states and 98 transitions. [2021-05-02 13:54:25,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:54:25,230 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:54:25,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:25,230 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:54:25,230 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 13:54:25,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:54:25,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 13:54:25,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 13:54:25,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 39 states have internal predecessors, (41), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 13:54:25,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 95 transitions. [2021-05-02 13:54:25,237 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 95 transitions. Word has length 45 [2021-05-02 13:54:25,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:25,237 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 95 transitions. [2021-05-02 13:54:25,237 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:54:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 95 transitions. [2021-05-02 13:54:25,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:54:25,238 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:25,238 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:25,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:25,453 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:25,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:25,453 INFO L82 PathProgramCache]: Analyzing trace with hash 780782572, now seen corresponding path program 2 times [2021-05-02 13:54:25,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:25,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502478859] [2021-05-02 13:54:25,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:25,462 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:25,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1528812475] [2021-05-02 13:54:25,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:25,512 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:54:25,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:54:25,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:54:25,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:25,671 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 28 proven. 9 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 13:54:25,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:25,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502478859] [2021-05-02 13:54:25,671 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:25,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528812475] [2021-05-02 13:54:25,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528812475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:25,671 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:25,671 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:54:25,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676020908] [2021-05-02 13:54:25,672 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:54:25,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:25,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:54:25,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:54:25,673 INFO L87 Difference]: Start difference. First operand 75 states and 95 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:54:27,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:27,925 INFO L93 Difference]: Finished difference Result 82 states and 101 transitions. [2021-05-02 13:54:27,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:54:27,926 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:54:27,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:27,927 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:54:27,927 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:54:27,927 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 56.0ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:54:27,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:54:27,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2021-05-02 13:54:27,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 40 states have (on average 1.1) internal successors, (44), 42 states have internal predecessors, (44), 27 states have call successors, (27), 11 states have call predecessors, (27), 10 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:54:27,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 95 transitions. [2021-05-02 13:54:27,935 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 95 transitions. Word has length 50 [2021-05-02 13:54:27,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:27,935 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 95 transitions. [2021-05-02 13:54:27,935 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:54:27,936 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 95 transitions. [2021-05-02 13:54:27,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:54:27,936 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:27,936 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:28,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:28,153 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:28,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:28,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1284663070, now seen corresponding path program 1 times [2021-05-02 13:54:28,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:28,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686093750] [2021-05-02 13:54:28,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:28,158 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:28,158 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [380099201] [2021-05-02 13:54:28,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:28,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:28,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:54:28,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:28,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,493 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,541 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:28,643 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 51 proven. 9 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:54:28,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:28,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686093750] [2021-05-02 13:54:28,644 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:28,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380099201] [2021-05-02 13:54:28,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380099201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:28,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:28,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:54:28,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507709938] [2021-05-02 13:54:28,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:54:28,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:28,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:54:28,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:28,645 INFO L87 Difference]: Start difference. First operand 78 states and 95 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:28,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:28,830 INFO L93 Difference]: Finished difference Result 84 states and 100 transitions. [2021-05-02 13:54:28,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:54:28,830 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 71 [2021-05-02 13:54:28,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:28,831 INFO L225 Difference]: With dead ends: 84 [2021-05-02 13:54:28,831 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 13:54:28,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 127.7ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:54:28,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 13:54:28,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2021-05-02 13:54:28,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 43 states have (on average 1.0930232558139534) internal successors, (47), 45 states have internal predecessors, (47), 27 states have call successors, (27), 12 states have call predecessors, (27), 11 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:54:28,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 98 transitions. [2021-05-02 13:54:28,838 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 98 transitions. Word has length 71 [2021-05-02 13:54:28,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:28,838 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 98 transitions. [2021-05-02 13:54:28,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:28,838 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 98 transitions. [2021-05-02 13:54:28,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:54:28,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:28,839 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:29,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:54:29,053 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:29,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:29,053 INFO L82 PathProgramCache]: Analyzing trace with hash -2139863911, now seen corresponding path program 2 times [2021-05-02 13:54:29,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:29,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021012064] [2021-05-02 13:54:29,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:29,059 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:29,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2054508362] [2021-05-02 13:54:29,059 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 13:54:29,102 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:54:29,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:54:29,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:54:29,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:29,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:29,204 INFO L134 CoverageAnalysis]: Checked inductivity of 254 backedges. 60 proven. 112 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-05-02 13:54:29,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:29,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021012064] [2021-05-02 13:54:29,205 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:29,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054508362] [2021-05-02 13:54:29,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054508362] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:29,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:29,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:54:29,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429250972] [2021-05-02 13:54:29,205 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:54:29,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:29,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:54:29,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:54:29,206 INFO L87 Difference]: Start difference. First operand 82 states and 98 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:29,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:29,288 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 13:54:29,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:54:29,288 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:54:29,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:29,292 INFO L225 Difference]: With dead ends: 106 [2021-05-02 13:54:29,292 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 13:54:29,292 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 37.4ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:54:29,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 13:54:29,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2021-05-02 13:54:29,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 48 states have (on average 1.1041666666666667) internal successors, (53), 50 states have internal predecessors, (53), 27 states have call successors, (27), 13 states have call predecessors, (27), 12 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 13:54:29,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 104 transitions. [2021-05-02 13:54:29,302 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 104 transitions. Word has length 73 [2021-05-02 13:54:29,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:29,302 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 104 transitions. [2021-05-02 13:54:29,302 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 5 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:29,302 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 104 transitions. [2021-05-02 13:54:29,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:54:29,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:29,307 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:29,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:54:29,517 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:29,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:29,517 INFO L82 PathProgramCache]: Analyzing trace with hash -1647748595, now seen corresponding path program 3 times [2021-05-02 13:54:29,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:29,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569497882] [2021-05-02 13:54:29,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:29,522 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:29,522 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [580255243] [2021-05-02 13:54:29,522 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 13:54:29,590 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:54:29,591 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:54:29,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:54:29,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:29,728 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 51 proven. 17 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 13:54:29,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:29,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569497882] [2021-05-02 13:54:29,728 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:29,728 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580255243] [2021-05-02 13:54:29,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580255243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:29,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:29,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:54:29,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628067676] [2021-05-02 13:54:29,729 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:54:29,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:29,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:54:29,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:29,730 INFO L87 Difference]: Start difference. First operand 88 states and 104 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:29,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:30,000 INFO L93 Difference]: Finished difference Result 110 states and 135 transitions. [2021-05-02 13:54:30,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:54:30,000 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 73 [2021-05-02 13:54:30,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:30,001 INFO L225 Difference]: With dead ends: 110 [2021-05-02 13:54:30,001 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 13:54:30,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 57.7ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:54:30,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 13:54:30,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 13:54:30,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 55 states have (on average 1.1090909090909091) internal successors, (61), 58 states have internal predecessors, (61), 37 states have call successors, (37), 15 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:54:30,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 132 transitions. [2021-05-02 13:54:30,025 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 132 transitions. Word has length 73 [2021-05-02 13:54:30,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:30,026 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 132 transitions. [2021-05-02 13:54:30,026 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 13:54:30,026 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 132 transitions. [2021-05-02 13:54:30,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 13:54:30,027 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:30,027 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:30,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:30,241 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:30,241 INFO L82 PathProgramCache]: Analyzing trace with hash -904350414, now seen corresponding path program 1 times [2021-05-02 13:54:30,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:30,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319519084] [2021-05-02 13:54:30,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:30,246 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:30,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [556104815] [2021-05-02 13:54:30,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:30,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:54:30,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:54:30,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:54:30,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:54:30,447 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 53 proven. 12 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-02 13:54:30,448 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:54:30,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319519084] [2021-05-02 13:54:30,448 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:54:30,448 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556104815] [2021-05-02 13:54:30,448 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556104815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:54:30,448 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:54:30,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:54:30,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148136383] [2021-05-02 13:54:30,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:54:30,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:54:30,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:54:30,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:54:30,449 INFO L87 Difference]: Start difference. First operand 107 states and 132 transitions. Second operand has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:54:30,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:54:30,609 INFO L93 Difference]: Finished difference Result 113 states and 137 transitions. [2021-05-02 13:54:30,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:54:30,610 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) Word has length 76 [2021-05-02 13:54:30,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:54:30,611 INFO L225 Difference]: With dead ends: 113 [2021-05-02 13:54:30,611 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 13:54:30,612 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 59.6ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:54:30,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 13:54:30,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 13:54:30,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 57 states have (on average 1.087719298245614) internal successors, (62), 59 states have internal predecessors, (62), 37 states have call successors, (37), 16 states have call predecessors, (37), 14 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-05-02 13:54:30,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 133 transitions. [2021-05-02 13:54:30,618 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 133 transitions. Word has length 76 [2021-05-02 13:54:30,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:54:30,618 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 133 transitions. [2021-05-02 13:54:30,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 13:54:30,618 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 133 transitions. [2021-05-02 13:54:30,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 13:54:30,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:54:30,619 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:54:30,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:54:30,836 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:54:30,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:54:30,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1454229731, now seen corresponding path program 4 times [2021-05-02 13:54:30,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:54:30,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552907957] [2021-05-02 13:54:30,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:54:30,843 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:54:30,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [896361605] [2021-05-02 13:54:30,843 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 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