/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/ps5-ll_unwindbound10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:00:22,173 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:00:22,175 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:00:22,206 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:00:22,221 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:00:22,222 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:00:22,223 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:00:22,224 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:00:22,226 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:00:22,226 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:00:22,228 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:00:22,231 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:00:22,232 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:00:22,233 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:00:22,235 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:00:22,236 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:00:22,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:00:22,247 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:00:22,247 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:00:22,248 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:00:22,248 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 17:00:22,276 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:00:22,276 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:00:22,278 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:00:22,278 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:00:22,278 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:00:22,278 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:00:22,279 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:00:22,279 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:00:22,279 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:00:22,279 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:00:22,280 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:00:22,281 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:00:22,281 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:00:22,281 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:00:22,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:00:22,281 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:00:22,281 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:00:22,281 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:00:22,282 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:00:22,282 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:00:22,282 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:00:22,282 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:00:22,282 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:00:22,554 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:00:22,575 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:00:22,577 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:00:22,577 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:00:22,578 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:00:22,579 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound10.c [2021-05-02 17:00:22,632 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cf569f57/8685934e0fc245ca92fd05f60f894b21/FLAG49e7226e5 [2021-05-02 17:00:23,039 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:00:23,040 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound10.c [2021-05-02 17:00:23,043 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cf569f57/8685934e0fc245ca92fd05f60f894b21/FLAG49e7226e5 [2021-05-02 17:00:23,053 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6cf569f57/8685934e0fc245ca92fd05f60f894b21 [2021-05-02 17:00:23,055 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:00:23,056 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:00:23,057 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:00:23,057 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:00:23,071 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:00:23,072 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ed14d28 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23, skipping insertion in model container [2021-05-02 17:00:23,072 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,077 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:00:23,086 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:00:23,206 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/ps5-ll_unwindbound10.c[458,471] [2021-05-02 17:00:23,221 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:00:23,226 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:00:23,235 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/ps5-ll_unwindbound10.c[458,471] [2021-05-02 17:00:23,247 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:00:23,257 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:00:23,258 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23 WrapperNode [2021-05-02 17:00:23,258 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:00:23,259 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:00:23,260 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:00:23,260 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:00:23,282 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,282 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,286 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,286 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,312 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,316 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,317 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (1/1) ... [2021-05-02 17:00:23,321 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:00:23,322 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:00:23,322 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:00:23,322 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:00:23,322 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (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 17:00:23,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:00:23,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:00:23,381 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:00:23,381 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:00:23,381 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:00:23,382 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:00:23,382 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:00:23,383 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:00:23,383 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:00:23,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:00:23,384 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:00:23,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:00:23,384 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:00:23,384 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:00:23,384 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:00:23,576 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:00:23,576 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:00:23,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:00:23 BoogieIcfgContainer [2021-05-02 17:00:23,577 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:00:23,578 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:00:23,578 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:00:23,580 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:00:23,580 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:00:23" (1/3) ... [2021-05-02 17:00:23,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@156a78ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:00:23, skipping insertion in model container [2021-05-02 17:00:23,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:00:23" (2/3) ... [2021-05-02 17:00:23,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@156a78ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:00:23, skipping insertion in model container [2021-05-02 17:00:23,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:00:23" (3/3) ... [2021-05-02 17:00:23,582 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_unwindbound10.c [2021-05-02 17:00:23,604 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:00:23,606 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:00:23,616 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:00:23,647 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:00:23,647 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:00:23,647 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:00:23,647 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:00:23,647 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:00:23,647 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:00:23,647 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:00:23,647 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:00:23,659 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:00:23,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:00:23,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:23,662 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:23,662 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:23,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:23,665 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-02 17:00:23,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:23,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272129864] [2021-05-02 17:00:23,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:23,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:23,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:00:23,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:23,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:00:23,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:23,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:23,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:23,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272129864] [2021-05-02 17:00:23,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272129864] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:00:23,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:00:23,820 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:00:23,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414462945] [2021-05-02 17:00:23,822 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:00:23,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:23,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:00:23,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:00:23,831 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:00:23,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:23,888 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-02 17:00:23,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:00:23,889 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-02 17:00:23,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:23,893 INFO L225 Difference]: With dead ends: 50 [2021-05-02 17:00:23,893 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 17:00:23,895 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:00:23,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 17:00:23,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 17:00:23,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:00:23,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:00:23,917 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-02 17:00:23,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:23,917 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:00:23,917 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:00:23,917 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:00:23,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:00:23,918 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:23,918 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:23,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:00:23,919 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:23,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:23,919 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-02 17:00:23,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:23,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551561557] [2021-05-02 17:00:23,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:23,932 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:23,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [45048336] [2021-05-02 17:00:23,933 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 17:00:23,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:23,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:00:23,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:24,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,110 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:24,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:24,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551561557] [2021-05-02 17:00:24,113 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:24,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45048336] [2021-05-02 17:00:24,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45048336] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:00:24,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:00:24,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:00:24,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323351289] [2021-05-02 17:00:24,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:00:24,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:24,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:00:24,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:00:24,118 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:00:24,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:24,132 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-02 17:00:24,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:00:24,133 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-02 17:00:24,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:24,133 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:00:24,133 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:00:24,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:00:24,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:00:24,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 17:00:24,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:00:24,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-02 17:00:24,138 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-02 17:00:24,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:24,138 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-02 17:00:24,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:00:24,138 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-02 17:00:24,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 17:00:24,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:24,139 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:24,345 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:00:24,345 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:24,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:24,346 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-02 17:00:24,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:24,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [721951518] [2021-05-02 17:00:24,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:24,360 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:24,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1654330520] [2021-05-02 17:00:24,360 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 17:00:24,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:24,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:00:24,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:24,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:24,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:24,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [721951518] [2021-05-02 17:00:24,470 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:24,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1654330520] [2021-05-02 17:00:24,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1654330520] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:00:24,470 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:00:24,470 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 17:00:24,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944203610] [2021-05-02 17:00:24,470 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:00:24,470 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:24,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:00:24,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:00:24,471 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:00:24,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:24,519 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-02 17:00:24,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:00:24,520 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 17:00:24,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:24,520 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:00:24,521 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 17:00:24,521 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 27.8ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:00:24,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 17:00:24,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 17:00:24,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:00:24,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 17:00:24,527 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-02 17:00:24,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:24,527 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 17:00:24,527 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 17:00:24,527 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 17:00:24,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:00:24,528 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:24,528 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:24,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:24,730 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:24,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:24,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-02 17:00:24,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:24,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15634564] [2021-05-02 17:00:24,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:24,742 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:24,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886369043] [2021-05-02 17:00:24,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:24,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:24,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:00:24,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:24,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,909 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:24,937 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:24,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:24,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15634564] [2021-05-02 17:00:24,937 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:24,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886369043] [2021-05-02 17:00:24,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886369043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:00:24,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:00:24,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 17:00:24,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613597008] [2021-05-02 17:00:24,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:00:24,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:24,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:00:24,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:00:24,939 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:00:24,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:24,974 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-02 17:00:24,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:00:24,975 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-02 17:00:24,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:24,975 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:00:24,975 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:00:24,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 16.3ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:00:24,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:00:24,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 17:00:24,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:00:24,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 17:00:24,979 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-02 17:00:24,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:24,980 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 17:00:24,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:00:24,980 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 17:00:24,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:00:24,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:24,980 INFO L523 BasicCegarLoop]: trace histogram [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 17:00:25,192 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:25,193 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:25,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:25,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-02 17:00:25,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:25,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2123677672] [2021-05-02 17:00:25,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:25,207 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:25,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1536844650] [2021-05-02 17:00:25,207 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 17:00:25,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:25,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:00:25,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:25,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:25,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:25,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2123677672] [2021-05-02 17:00:25,358 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:25,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536844650] [2021-05-02 17:00:25,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536844650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:00:25,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:00:25,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:00:25,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547211184] [2021-05-02 17:00:25,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:00:25,359 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:25,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:00:25,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:00:25,359 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 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 17:00:25,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:25,448 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 17:00:25,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:00:25,449 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 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 26 [2021-05-02 17:00:25,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:25,450 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:00:25,450 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 17:00:25,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 34.8ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:00:25,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 17:00:25,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 17:00:25,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:00:25,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-02 17:00:25,456 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-02 17:00:25,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:25,457 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-02 17:00:25,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 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 17:00:25,457 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-02 17:00:25,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:00:25,457 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:25,457 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:25,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:25,669 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:25,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:25,669 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-02 17:00:25,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:25,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132976964] [2021-05-02 17:00:25,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:25,677 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:25,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2085027966] [2021-05-02 17:00:25,677 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:25,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:00:25,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:00:25,716 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:00:25,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:25,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:25,798 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:00:25,798 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:25,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132976964] [2021-05-02 17:00:25,799 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:25,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085027966] [2021-05-02 17:00:25,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085027966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:00:25,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:00:25,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:00:25,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407459697] [2021-05-02 17:00:25,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:00:25,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:25,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:00:25,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:00:25,800 INFO L87 Difference]: Start difference. First operand 41 states and 46 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:00:25,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:25,844 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 17:00:25,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:00:25,845 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-02 17:00:25,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:25,846 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:00:25,846 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:00:25,846 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 17.9ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:00:25,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:00:25,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:00:25,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:00:25,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:00:25,851 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-02 17:00:25,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:25,851 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:00:25,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 17:00:25,852 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:00:25,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:00:25,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:25,852 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:26,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 17:00:26,062 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:26,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:26,062 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-02 17:00:26,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:26,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1268138152] [2021-05-02 17:00:26,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:26,095 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:26,095 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2078796187] [2021-05-02 17:00:26,095 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 17:00:26,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:00:26,311 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:00:26,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:00:26,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:28,481 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:00:28,481 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:28,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1268138152] [2021-05-02 17:00:28,481 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:28,481 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078796187] [2021-05-02 17:00:28,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078796187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:00:28,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:00:28,482 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:00:28,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681672072] [2021-05-02 17:00:28,482 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:00:28,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:28,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:00:28,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:00:28,483 INFO L87 Difference]: Start difference. First operand 46 states and 51 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:00:28,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:28,588 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-02 17:00:28,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:00:28,589 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-02 17:00:28,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:28,589 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:00:28,589 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 17:00:28,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2100.7ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:00:28,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 17:00:28,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 17:00:28,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:00:28,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-02 17:00:28,595 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-02 17:00:28,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:28,596 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-02 17:00:28,596 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, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 17:00:28,596 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-02 17:00:28,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:00:28,596 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:28,596 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:28,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:28,799 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:28,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:28,799 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-02 17:00:28,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:28,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468972887] [2021-05-02 17:00:28,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:28,810 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:28,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1823812421] [2021-05-02 17:00:28,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:28,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:00:28,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:00:28,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:00:28,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:28,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:00:29,007 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:00:29,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:00:29,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468972887] [2021-05-02 17:00:29,008 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:00:29,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823812421] [2021-05-02 17:00:29,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823812421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:00:29,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:00:29,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:00:29,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495822207] [2021-05-02 17:00:29,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:00:29,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:00:29,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:00:29,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:00:29,009 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:00:29,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:00:29,104 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-02 17:00:29,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:00:29,104 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-02 17:00:29,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:00:29,105 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:00:29,105 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:00:29,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 76.2ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:00:29,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:00:29,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:00:29,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:00:29,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:00:29,111 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-02 17:00:29,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:00:29,111 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:00:29,121 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 17:00:29,121 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:00:29,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 17:00:29,122 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:00:29,122 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:00:29,341 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:00:29,341 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:00:29,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:00:29,341 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-02 17:00:29,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:00:29,342 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139904080] [2021-05-02 17:00:29,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:00:29,349 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:00:29,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [129758125] [2021-05-02 17:00:29,349 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 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