/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:16:06,600 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:16:06,602 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:16:06,634 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:16:06,649 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:16:06,651 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:16:06,652 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:16:06,653 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:16:06,655 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:16:06,656 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:16:06,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:16:06,662 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:16:06,663 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:16:06,664 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:16:06,665 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:16:06,667 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:16:06,672 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:16:06,678 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:16:06,679 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:16:06,680 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:16:06,683 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 17:16:06,720 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:16:06,720 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:16:06,722 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:16:06,722 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:16:06,723 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:16:06,723 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:16:06,723 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:16:06,723 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:16:06,723 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:16:06,723 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:16:06,724 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:16:06,725 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:16:06,725 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:16:06,725 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:16:06,726 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:16:06,726 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:16:06,726 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:16:06,726 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:16:06,988 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:16:07,001 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:16:07,004 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:16:07,005 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:16:07,006 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:16:07,007 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound10.c [2021-05-02 17:16:07,083 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3105bc9/f3053d56f3c14a2e9de702c107b1c13b/FLAGa7ea08e37 [2021-05-02 17:16:07,425 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:16:07,425 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound10.c [2021-05-02 17:16:07,434 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3105bc9/f3053d56f3c14a2e9de702c107b1c13b/FLAGa7ea08e37 [2021-05-02 17:16:07,810 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ec3105bc9/f3053d56f3c14a2e9de702c107b1c13b [2021-05-02 17:16:07,816 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:16:07,818 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:16:07,821 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:16:07,821 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:16:07,824 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:16:07,825 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,826 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ecdaa90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07, skipping insertion in model container [2021-05-02 17:16:07,826 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,831 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:16:07,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:16:07,935 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound10.c[458,471] [2021-05-02 17:16:07,944 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:16:07,950 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:16:07,962 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound10.c[458,471] [2021-05-02 17:16:07,969 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:16:07,978 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:16:07,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07 WrapperNode [2021-05-02 17:16:07,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:16:07,979 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:16:07,979 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:16:07,980 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:16:07,986 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,991 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,991 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,994 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,997 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (1/1) ... [2021-05-02 17:16:07,998 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:16:07,998 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:16:07,998 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:16:07,998 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:16:07,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (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 17:16:08,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:16:08,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:16:08,101 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:16:08,101 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:16:08,101 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:16:08,102 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:16:08,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:16:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:16:08,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:16:08,278 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:16:08,278 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:16:08,279 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:16:08 BoogieIcfgContainer [2021-05-02 17:16:08,279 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:16:08,280 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:16:08,280 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:16:08,282 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:16:08,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:16:07" (1/3) ... [2021-05-02 17:16:08,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e238917 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:16:08, skipping insertion in model container [2021-05-02 17:16:08,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:16:07" (2/3) ... [2021-05-02 17:16:08,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e238917 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:16:08, skipping insertion in model container [2021-05-02 17:16:08,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:16:08" (3/3) ... [2021-05-02 17:16:08,284 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_valuebound10.c [2021-05-02 17:16:08,287 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:16:08,289 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:16:08,305 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:16:08,318 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:16:08,318 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:16:08,318 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:16:08,318 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:16:08,318 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:16:08,318 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:16:08,319 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:16:08,319 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:16:08,344 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:16:08,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:16:08,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:08,348 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:08,348 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:08,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:08,362 INFO L82 PathProgramCache]: Analyzing trace with hash 1098891495, now seen corresponding path program 1 times [2021-05-02 17:16:08,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:08,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501395448] [2021-05-02 17:16:08,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:08,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:08,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:16:08,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:08,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:16:08,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:08,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 17:16:08,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:08,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:16:08,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:08,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501395448] [2021-05-02 17:16:08,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501395448] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:16:08,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:16:08,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:16:08,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725330051] [2021-05-02 17:16:08,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:16:08,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:08,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:16:08,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:16:08,595 INFO L87 Difference]: Start difference. First operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:16:08,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:16:08,876 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2021-05-02 17:16:08,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:16:08,886 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 17:16:08,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:16:08,891 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:16:08,891 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:16:08,893 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 50.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:16:08,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:16:08,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:16:08,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:16:08,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:16:08,919 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 22 [2021-05-02 17:16:08,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:16:08,919 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:16:08,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:16:08,920 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:16:08,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:16:08,922 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:08,922 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:08,922 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:16:08,923 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:08,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:08,924 INFO L82 PathProgramCache]: Analyzing trace with hash 769620075, now seen corresponding path program 1 times [2021-05-02 17:16:08,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:08,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000209184] [2021-05-02 17:16:08,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:08,949 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:16:08,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1372662608] [2021-05-02 17:16:08,949 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 17:16:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:09,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:16:09,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:16:09,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:09,144 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:16:09,144 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:09,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000209184] [2021-05-02 17:16:09,145 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:16:09,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372662608] [2021-05-02 17:16:09,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372662608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:16:09,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:16:09,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:16:09,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23061505] [2021-05-02 17:16:09,146 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:16:09,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:09,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:16:09,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:16:09,148 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:16:40,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:16:40,027 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 17:16:40,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:16:40,027 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-05-02 17:16:40,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:16:40,028 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:16:40,028 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:16:40,029 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:16:40,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:16:40,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 17:16:40,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:16:40,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 17:16:40,035 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 22 [2021-05-02 17:16:40,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:16:40,036 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 17:16:40,036 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:16:40,036 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 17:16:40,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:16:40,036 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:40,036 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:40,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:16:40,246 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:40,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:40,246 INFO L82 PathProgramCache]: Analyzing trace with hash 645812411, now seen corresponding path program 1 times [2021-05-02 17:16:40,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:40,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640158161] [2021-05-02 17:16:40,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:40,255 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:16:40,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1447604412] [2021-05-02 17:16:40,255 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 17:16:40,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:40,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:16:40,307 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:16:40,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:40,402 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:16:40,402 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:40,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640158161] [2021-05-02 17:16:40,402 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:16:40,402 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1447604412] [2021-05-02 17:16:40,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1447604412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:16:40,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:16:40,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:16:40,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427699056] [2021-05-02 17:16:40,403 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:16:40,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:40,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:16:40,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:16:40,404 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:16:40,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:16:40,478 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 17:16:40,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:16:40,479 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 17:16:40,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:16:40,482 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:16:40,482 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 17:16:40,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.7ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:16:40,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 17:16:40,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 17:16:40,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:16:40,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-05-02 17:16:40,498 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 29 [2021-05-02 17:16:40,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:16:40,499 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-05-02 17:16:40,499 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:16:40,499 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-05-02 17:16:40,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 17:16:40,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:40,501 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:40,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:16:40,717 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:40,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:40,718 INFO L82 PathProgramCache]: Analyzing trace with hash 1415216747, now seen corresponding path program 2 times [2021-05-02 17:16:40,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:40,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388970431] [2021-05-02 17:16:40,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:40,727 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:16:40,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2100680605] [2021-05-02 17:16:40,727 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 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 17:16:40,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:16:40,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:16:40,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 17:16:40,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:16:40,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:40,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:40,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:40,979 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:16:40,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:40,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388970431] [2021-05-02 17:16:40,979 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:16:40,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2100680605] [2021-05-02 17:16:40,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2100680605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:16:40,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:16:40,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:16:40,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316830839] [2021-05-02 17:16:40,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:16:40,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:40,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:16:40,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:16:40,981 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:16:41,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:16:41,090 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 17:16:41,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:16:41,092 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 17:16:41,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:16:41,092 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:16:41,093 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:16:41,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.2ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:16:41,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:16:41,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:16:41,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:16:41,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-05-02 17:16:41,100 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 36 [2021-05-02 17:16:41,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:16:41,100 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-05-02 17:16:41,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:16:41,100 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-05-02 17:16:41,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 17:16:41,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:41,101 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:41,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:16:41,317 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:41,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:41,318 INFO L82 PathProgramCache]: Analyzing trace with hash 463554397, now seen corresponding path program 1 times [2021-05-02 17:16:41,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:41,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1787278938] [2021-05-02 17:16:41,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:41,330 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:16:41,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1344215373] [2021-05-02 17:16:41,331 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 17:16:41,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:16:41,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:16:41,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:16:41,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:41,537 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:16:41,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:41,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1787278938] [2021-05-02 17:16:41,540 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:16:41,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344215373] [2021-05-02 17:16:41,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344215373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:16:41,540 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:16:41,540 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:16:41,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210982510] [2021-05-02 17:16:41,541 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:16:41,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:41,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:16:41,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:16:41,542 INFO L87 Difference]: Start difference. First operand 47 states and 54 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:16:41,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:16:41,637 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-02 17:16:41,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:16:41,637 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 40 [2021-05-02 17:16:41,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:16:41,639 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:16:41,639 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:16:41,639 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 66.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:16:41,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:16:41,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:16:41,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:16:41,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:16:41,645 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 17:16:41,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:16:41,645 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:16:41,645 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, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:16:41,645 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:16:41,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:16:41,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:16:41,646 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:16:41,861 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:16:41,861 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:16:41,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:16:41,861 INFO L82 PathProgramCache]: Analyzing trace with hash 380668603, now seen corresponding path program 3 times [2021-05-02 17:16:41,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:16:41,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139389398] [2021-05-02 17:16:41,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:16:41,883 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:16:41,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [569141111] [2021-05-02 17:16:41,884 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 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 17:16:41,944 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:16:41,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:16:41,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:16:41,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:16:42,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:42,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:16:44,605 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 17:16:44,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:16:44,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139389398] [2021-05-02 17:16:44,606 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:16:44,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569141111] [2021-05-02 17:16:44,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569141111] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:16:44,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:16:44,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:16:44,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476400782] [2021-05-02 17:16:44,606 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:16:44,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:16:44,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:16:44,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=29, Unknown=1, NotChecked=0, Total=42 [2021-05-02 17:16:44,607 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:17:14,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:14,691 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 17:17:14,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:17:14,691 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 43 [2021-05-02 17:17:14,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:14,692 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:17:14,692 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:17:14,692 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 30608.7ms TimeCoverageRelationStatistics Valid=23, Invalid=47, Unknown=2, NotChecked=0, Total=72 [2021-05-02 17:17:14,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:17:14,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-02 17:17:14,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:17:14,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 17:17:14,698 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 43 [2021-05-02 17:17:14,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:14,698 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 17:17:14,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:17:14,699 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 17:17:14,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:17:14,699 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:14,699 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:14,915 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:17:14,915 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:14,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:14,916 INFO L82 PathProgramCache]: Analyzing trace with hash 1886956461, now seen corresponding path program 2 times [2021-05-02 17:17:14,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:14,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999039953] [2021-05-02 17:17:14,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:14,931 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:14,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [998179364] [2021-05-02 17:17:14,932 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 17:17:14,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:17:14,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:14,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 17:17:14,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:15,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,178 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:17:15,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:15,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999039953] [2021-05-02 17:17:15,178 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:15,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998179364] [2021-05-02 17:17:15,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998179364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:15,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:15,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:17:15,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163745166] [2021-05-02 17:17:15,179 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:17:15,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:15,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:17:15,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:17:15,179 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:17:15,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:15,301 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-02 17:17:15,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:17:15,302 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 47 [2021-05-02 17:17:15,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:15,303 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:17:15,303 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:17:15,303 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 89.5ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:17:15,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:17:15,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:17:15,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:17:15,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-02 17:17:15,309 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 47 [2021-05-02 17:17:15,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:15,309 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-02 17:17:15,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:17:15,309 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-02 17:17:15,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 17:17:15,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:15,310 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:15,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:15,528 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:15,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:15,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1213805219, now seen corresponding path program 3 times [2021-05-02 17:17:15,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:15,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808241807] [2021-05-02 17:17:15,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:15,535 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:15,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1710456693] [2021-05-02 17:17:15,535 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 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 17:17:15,778 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:17:15,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:15,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:17:15,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:15,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:15,976 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 9 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 17:17:15,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:15,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808241807] [2021-05-02 17:17:15,977 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:15,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710456693] [2021-05-02 17:17:15,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710456693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:15,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:15,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:17:15,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616655301] [2021-05-02 17:17:15,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:17:15,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:15,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:17:15,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:17:15,978 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:17:16,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:16,132 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-02 17:17:16,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:17:16,132 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 54 [2021-05-02 17:17:16,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:16,136 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:17:16,136 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:17:16,136 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 93.2ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:17:16,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:17:16,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 17:17:16,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 11 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:17:16,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 17:17:16,150 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 54 [2021-05-02 17:17:16,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:16,150 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 17:17:16,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:17:16,150 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 17:17:16,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:17:16,154 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:16,154 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:16,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:17:16,361 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:16,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:16,362 INFO L82 PathProgramCache]: Analyzing trace with hash 307258797, now seen corresponding path program 4 times [2021-05-02 17:17:16,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:16,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067165554] [2021-05-02 17:17:16,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:16,375 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:16,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1847391479] [2021-05-02 17:17:16,375 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 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 17:17:16,409 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:17:16,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:16,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 17:17:16,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:16,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,620 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:16,640 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 33 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-05-02 17:17:16,640 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:16,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067165554] [2021-05-02 17:17:16,640 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:16,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847391479] [2021-05-02 17:17:16,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847391479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:16,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:16,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:17:16,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239457110] [2021-05-02 17:17:16,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:17:16,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:16,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:17:16,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:17:16,641 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 8 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-02 17:17:16,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:16,826 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2021-05-02 17:17:16,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:17:16,827 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 8 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 61 [2021-05-02 17:17:16,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:16,827 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:17:16,828 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 17:17:16,828 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 128.8ms TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:17:16,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 17:17:16,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2021-05-02 17:17:16,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:17:16,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:17:16,834 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 61 [2021-05-02 17:17:16,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:16,834 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:17:16,834 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.1666666666666665) internal successors, (26), 11 states have internal predecessors, (26), 8 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-05-02 17:17:16,834 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:17:16,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 17:17:16,835 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:16,835 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:17,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 17:17:17,036 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:17,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:17,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1082774365, now seen corresponding path program 5 times [2021-05-02 17:17:17,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:17,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27794012] [2021-05-02 17:17:17,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:17,056 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:17,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1636336212] [2021-05-02 17:17:17,056 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:17:17,571 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:17:17,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:17,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 17:17:17,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:17,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 61 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 17:17:17,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:17,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27794012] [2021-05-02 17:17:17,777 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:17,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636336212] [2021-05-02 17:17:17,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1636336212] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:17,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:17,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:17:17,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159188260] [2021-05-02 17:17:17,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:17:17,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:17,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:17:17,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:17:17,778 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:17:17,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:17,950 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-02 17:17:17,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:17:17,951 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 68 [2021-05-02 17:17:17,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:17,951 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:17:17,951 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 17:17:17,952 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 112.9ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:17:17,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 17:17:17,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 17:17:17,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 17:17:17,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-05-02 17:17:17,958 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 68 [2021-05-02 17:17:17,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:17,958 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-05-02 17:17:17,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:17:17,958 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-05-02 17:17:17,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:17:17,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:17,959 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:18,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:18,163 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:18,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:18,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1692754003, now seen corresponding path program 6 times [2021-05-02 17:17:18,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:18,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079260781] [2021-05-02 17:17:18,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:18,169 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:18,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [702917142] [2021-05-02 17:17:18,169 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:17:48,636 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:17:48,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:48,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 17:17:48,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:48,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,915 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:48,936 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 16 proven. 66 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2021-05-02 17:17:48,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:48,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079260781] [2021-05-02 17:17:48,937 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:48,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702917142] [2021-05-02 17:17:48,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [702917142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:48,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:48,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 17:17:48,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745249855] [2021-05-02 17:17:48,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:17:48,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:48,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:17:48,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:17:48,939 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 10 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-02 17:17:49,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:49,129 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-05-02 17:17:49,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:17:49,129 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 10 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 75 [2021-05-02 17:17:49,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:49,130 INFO L225 Difference]: With dead ends: 63 [2021-05-02 17:17:49,130 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 17:17:49,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 138.9ms TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:17:49,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 17:17:49,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 17:17:49,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 17:17:49,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-05-02 17:17:49,159 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 75 [2021-05-02 17:17:49,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:49,160 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-05-02 17:17:49,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 10 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2021-05-02 17:17:49,160 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-05-02 17:17:49,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 17:17:49,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:49,161 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:49,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 17:17:49,361 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:49,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:49,362 INFO L82 PathProgramCache]: Analyzing trace with hash 615143773, now seen corresponding path program 7 times [2021-05-02 17:17:49,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:49,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472462798] [2021-05-02 17:17:49,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:49,366 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:49,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769194391] [2021-05-02 17:17:49,367 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:50,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:50,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 17:17:50,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:50,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,212 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,213 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:50,406 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 18 proven. 87 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-05-02 17:17:50,406 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:50,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472462798] [2021-05-02 17:17:50,406 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:50,406 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769194391] [2021-05-02 17:17:50,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769194391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:50,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:50,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 17:17:50,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982185964] [2021-05-02 17:17:50,407 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:17:50,407 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:50,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:17:50,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:17:50,408 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-02 17:17:50,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:50,635 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2021-05-02 17:17:50,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:17:50,636 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 82 [2021-05-02 17:17:50,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:50,638 INFO L225 Difference]: With dead ends: 66 [2021-05-02 17:17:50,638 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 17:17:50,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 174.5ms TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:17:50,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 17:17:50,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-05-02 17:17:50,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 15 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 17:17:50,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 17:17:50,648 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 82 [2021-05-02 17:17:50,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:50,648 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 17:17:50,648 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-02 17:17:50,649 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 17:17:50,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 17:17:50,649 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:50,649 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:50,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:17:50,853 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:50,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:50,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1334355539, now seen corresponding path program 8 times [2021-05-02 17:17:50,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:50,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [856317340] [2021-05-02 17:17:50,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:50,858 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:50,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1099835499] [2021-05-02 17:17:50,858 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:51,903 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:17:51,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:51,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 17:17:51,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:51,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:51,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:51,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:51,968 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:51,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:51,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:52,213 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 23 proven. 108 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 17:17:52,213 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:52,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [856317340] [2021-05-02 17:17:52,213 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:52,213 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099835499] [2021-05-02 17:17:52,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099835499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:52,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:52,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 17:17:52,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [201149434] [2021-05-02 17:17:52,214 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:17:52,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:52,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:17:52,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:17:52,214 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-05-02 17:17:52,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:52,482 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-05-02 17:17:52,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:17:52,482 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) Word has length 89 [2021-05-02 17:17:52,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:52,483 INFO L225 Difference]: With dead ends: 69 [2021-05-02 17:17:52,483 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 17:17:52,483 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 163.0ms TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:17:52,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 17:17:52,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-05-02 17:17:52,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 17:17:52,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-05-02 17:17:52,490 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 89 [2021-05-02 17:17:52,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:52,491 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-05-02 17:17:52,491 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-05-02 17:17:52,491 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-05-02 17:17:52,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-02 17:17:52,491 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:52,492 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:52,696 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:52,696 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:52,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:52,697 INFO L82 PathProgramCache]: Analyzing trace with hash 711483229, now seen corresponding path program 9 times [2021-05-02 17:17:52,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:52,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283834970] [2021-05-02 17:17:52,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:52,704 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:52,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1660679321] [2021-05-02 17:17:52,704 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true