java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/nla-digbench/ps4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:06:40,153 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:06:40,155 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:06:40,168 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:06:40,168 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:06:40,169 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:06:40,171 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:06:40,173 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:06:40,174 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:06:40,175 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:06:40,176 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:06:40,177 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:06:40,178 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:06:40,179 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:06:40,180 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:06:40,181 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:06:40,181 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:06:40,182 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:06:40,184 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:06:40,186 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:06:40,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:06:40,189 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:06:40,190 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:06:40,191 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:06:40,194 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:06:40,197 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:06:40,198 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:06:40,199 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:06:40,200 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:06:40,201 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:06:40,201 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:06:40,202 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:06:40,202 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:06:40,202 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:06:40,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:06:40,204 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:06:40,205 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 [2019-10-15 01:06:40,220 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:06:40,220 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:06:40,221 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:06:40,221 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:06:40,222 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:06:40,222 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:06:40,222 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:06:40,222 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:06:40,223 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:06:40,223 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:06:40,223 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:06:40,223 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:06:40,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:06:40,224 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:06:40,224 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:06:40,224 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:06:40,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:06:40,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:06:40,225 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:06:40,225 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:06:40,225 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:06:40,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:06:40,225 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:06:40,226 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:06:40,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:06:40,226 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:06:40,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:06:40,226 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:06:40,227 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-15 01:06:40,527 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:06:40,542 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:06:40,548 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:06:40,549 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:06:40,550 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:06:40,551 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps4.c [2019-10-15 01:06:40,627 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f67ebe039/0459a31a944b4cdd9e1c14143919a308/FLAG729cf7eb4 [2019-10-15 01:06:41,092 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:06:41,092 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps4.c [2019-10-15 01:06:41,098 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f67ebe039/0459a31a944b4cdd9e1c14143919a308/FLAG729cf7eb4 [2019-10-15 01:06:41,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f67ebe039/0459a31a944b4cdd9e1c14143919a308 [2019-10-15 01:06:41,473 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:06:41,474 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:06:41,475 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:06:41,476 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:06:41,482 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:06:41,483 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,486 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2efc65e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41, skipping insertion in model container [2019-10-15 01:06:41,486 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,493 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:06:41,509 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:06:41,697 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:06:41,701 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:06:41,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:06:41,729 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:06:41,730 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41 WrapperNode [2019-10-15 01:06:41,730 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:06:41,731 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:06:41,731 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:06:41,731 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:06:41,740 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,741 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,816 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,817 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,820 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,829 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,831 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (1/1) ... [2019-10-15 01:06:41,836 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:06:41,837 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:06:41,837 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:06:41,837 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:06:41,838 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (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 [2019-10-15 01:06:41,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:06:41,884 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:06:41,884 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:06:41,884 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:06:41,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:06:41,885 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:06:41,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:06:41,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:06:41,886 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:06:41,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:06:41,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:06:42,050 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:06:42,051 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:06:42,052 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:06:42 BoogieIcfgContainer [2019-10-15 01:06:42,052 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:06:42,053 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:06:42,054 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:06:42,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:06:42,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:06:41" (1/3) ... [2019-10-15 01:06:42,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c1b7324 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:06:42, skipping insertion in model container [2019-10-15 01:06:42,058 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:06:41" (2/3) ... [2019-10-15 01:06:42,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c1b7324 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:06:42, skipping insertion in model container [2019-10-15 01:06:42,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:06:42" (3/3) ... [2019-10-15 01:06:42,061 INFO L109 eAbstractionObserver]: Analyzing ICFG ps4.c [2019-10-15 01:06:42,070 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:06:42,078 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:06:42,090 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:06:42,117 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:06:42,117 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:06:42,117 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:06:42,118 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:06:42,118 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:06:42,118 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:06:42,118 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:06:42,119 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:06:42,142 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-10-15 01:06:42,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-15 01:06:42,148 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:06:42,149 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:06:42,152 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:06:42,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:06:42,158 INFO L82 PathProgramCache]: Analyzing trace with hash -148746498, now seen corresponding path program 1 times [2019-10-15 01:06:42,170 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:06:42,171 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [619285995] [2019-10-15 01:06:42,171 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:42,171 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:42,171 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:06:42,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:06:42,293 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:06:42,294 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [619285995] [2019-10-15 01:06:42,295 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:06:42,295 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 01:06:42,295 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602920568] [2019-10-15 01:06:42,299 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 01:06:42,301 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:06:42,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 01:06:42,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 01:06:42,314 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-10-15 01:06:42,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:06:42,337 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2019-10-15 01:06:42,337 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 01:06:42,338 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-10-15 01:06:42,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:06:42,348 INFO L225 Difference]: With dead ends: 37 [2019-10-15 01:06:42,348 INFO L226 Difference]: Without dead ends: 16 [2019-10-15 01:06:42,351 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 01:06:42,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-15 01:06:42,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-15 01:06:42,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-15 01:06:42,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-10-15 01:06:42,390 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2019-10-15 01:06:42,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:06:42,390 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-10-15 01:06:42,390 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 01:06:42,391 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-10-15 01:06:42,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-15 01:06:42,393 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:06:42,394 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:06:42,394 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:06:42,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:06:42,396 INFO L82 PathProgramCache]: Analyzing trace with hash -156194248, now seen corresponding path program 1 times [2019-10-15 01:06:42,396 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:06:42,396 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562998521] [2019-10-15 01:06:42,397 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:42,397 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:42,397 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:06:42,404 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:06:42,404 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [393504294] [2019-10-15 01:06:42,405 INFO L94 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 [2019-10-15 01:06:42,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:06:42,442 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:06:42,447 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:06:42,525 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:06:42,525 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:06:42,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:06:42,651 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562998521] [2019-10-15 01:06:42,652 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:06:42,652 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393504294] [2019-10-15 01:06:42,652 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:06:42,653 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-10-15 01:06:42,653 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [812341099] [2019-10-15 01:06:42,655 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-15 01:06:42,655 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:06:42,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-15 01:06:42,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-15 01:06:42,657 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 8 states. [2019-10-15 01:06:42,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:06:42,826 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2019-10-15 01:06:42,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:06:42,826 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2019-10-15 01:06:42,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:06:42,828 INFO L225 Difference]: With dead ends: 27 [2019-10-15 01:06:42,828 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:06:42,829 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:06:42,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:06:42,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:06:42,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:06:42,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-10-15 01:06:42,838 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 10 [2019-10-15 01:06:42,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:06:42,838 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-10-15 01:06:42,838 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-15 01:06:42,839 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-10-15 01:06:42,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:06:42,840 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:06:42,840 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:06:43,044 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:06:43,044 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:06:43,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:06:43,046 INFO L82 PathProgramCache]: Analyzing trace with hash 1323071607, now seen corresponding path program 1 times [2019-10-15 01:06:43,046 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:06:43,047 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428255216] [2019-10-15 01:06:43,047 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:43,048 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:06:43,048 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:06:43,059 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:06:43,060 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1563749523] [2019-10-15 01:06:43,060 INFO L94 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 [2019-10-15 01:06:43,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:06:43,097 WARN L254 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 01:06:43,099 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:06:43,247 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:06:43,290 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:06:43,290 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:06:43,395 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:06:43,511 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:06:45,671 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse5 (+ c_main_~y~0 1))) (let ((.cse2 (* .cse5 .cse5))) (let ((.cse3 (* .cse2 .cse5))) (let ((.cse0 (* (* (+ (* c_main_~y~0 2) 2) .cse5) .cse5)) (.cse1 (* .cse3 .cse5))) (or (not (= (div (+ .cse0 .cse1 .cse2) 4) (+ c_main_~x~0 .cse3))) (forall ((main_~k~0 Int)) (or (< (+ c_main_~c~0 1) main_~k~0) (let ((.cse4 (+ c_main_~y~0 1))) (= (* main_~k~0 .cse4) (* .cse4 .cse4))) (<= main_~k~0 c_main_~c~0))) (not (= 0 (mod (+ .cse2 .cse0 .cse1) 4)))))))) is different from false [2019-10-15 01:06:45,818 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:07:07,206 WARN L191 SmtUtils]: Spent 6.29 s on a formula simplification. DAG size of input: 42 DAG size of output: 27 [2019-10-15 01:07:07,211 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:07:07,211 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:07:07,220 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:07:07,246 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2019-10-15 01:07:07,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428255216] [2019-10-15 01:07:07,247 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:07:07,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1563749523] [2019-10-15 01:07:07,247 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [109249524] [2019-10-15 01:07:07,253 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 24 [2019-10-15 01:07:07,288 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-15 01:07:07,288 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-15 01:07:07,453 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-10-15 01:07:07,455 INFO L272 AbstractInterpreter]: Visited 13 different actions 13 times. Never merged. Never widened. Performed 12 root evaluator evaluations with a maximum evaluation depth of 12. Performed 12 inverse root evaluator evaluations with a maximum inverse evaluation depth of 12. Never found a fixpoint. Largest state had 5 variables. [2019-10-15 01:07:07,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:07:07,459 INFO L337 tionRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-10-15 01:07:07,459 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:07:07,460 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2019-10-15 01:07:07,460 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354313481] [2019-10-15 01:07:07,461 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 01:07:07,462 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-15 01:07:07,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 01:07:07,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=186, Unknown=7, NotChecked=28, Total=272 [2019-10-15 01:07:07,464 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 17 states. [2019-10-15 01:07:09,990 WARN L191 SmtUtils]: Spent 2.41 s on a formula simplification. DAG size of input: 33 DAG size of output: 21 [2019-10-15 01:07:12,880 WARN L191 SmtUtils]: Spent 2.81 s on a formula simplification. DAG size of input: 34 DAG size of output: 22 [2019-10-15 01:07:15,057 WARN L191 SmtUtils]: Spent 2.08 s on a formula simplification that was a NOOP. DAG size: 32 [2019-10-15 01:07:21,323 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse6 (* c_main_~y~0 2)) (.cse4 (forall ((main_~k~0 Int)) (or (< (+ c_main_~c~0 1) main_~k~0) (let ((.cse8 (+ c_main_~y~0 1))) (= (* main_~k~0 .cse8) (* .cse8 .cse8))) (<= main_~k~0 c_main_~c~0)))) (.cse7 (* c_main_~y~0 c_main_~y~0))) (and (let ((.cse5 (+ c_main_~y~0 1))) (let ((.cse2 (* .cse5 .cse5))) (let ((.cse3 (* .cse2 .cse5))) (let ((.cse0 (* (* (+ .cse6 2) .cse5) .cse5)) (.cse1 (* .cse3 .cse5))) (or (not (= (div (+ .cse0 .cse1 .cse2) 4) (+ c_main_~x~0 .cse3))) .cse4 (not (= 0 (mod (+ .cse2 .cse0 .cse1) 4)))))))) (or (not (= (+ .cse7 (* (* .cse6 c_main_~y~0) c_main_~y~0) (* (* .cse7 c_main_~y~0) c_main_~y~0)) (* 4 c_main_~x~0))) .cse4) (or (= (* c_main_~k~0 c_main_~y~0) .cse7) (< c_main_~c~0 c_main_~k~0)))) is different from false [2019-10-15 01:07:23,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:07:23,581 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2019-10-15 01:07:23,582 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-15 01:07:23,582 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 23 [2019-10-15 01:07:23,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:07:23,583 INFO L225 Difference]: With dead ends: 39 [2019-10-15 01:07:23,583 INFO L226 Difference]: Without dead ends: 33 [2019-10-15 01:07:23,584 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=93, Invalid=324, Unknown=11, NotChecked=78, Total=506 [2019-10-15 01:07:23,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-15 01:07:23,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-10-15 01:07:23,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:07:23,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-15 01:07:23,596 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 23 [2019-10-15 01:07:23,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:07:23,596 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-15 01:07:23,596 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 01:07:23,596 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-15 01:07:23,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:07:23,598 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:07:23,598 INFO L380 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:07:23,798 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:07:23,799 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:07:23,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:07:23,800 INFO L82 PathProgramCache]: Analyzing trace with hash 2137184911, now seen corresponding path program 2 times [2019-10-15 01:07:23,801 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-15 01:07:23,801 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781773813] [2019-10-15 01:07:23,802 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:07:23,802 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:07:23,802 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:07:23,808 ERROR L273 tionRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-10-15 01:07:23,808 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [505811705] [2019-10-15 01:07:23,808 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:07:23,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-10-15 01:07:23,856 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:07:23,858 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-15 01:07:23,861 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:07:23,992 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:07:24,026 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 9 proven. 43 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-15 01:07:24,026 INFO L321 TraceCheckSpWp]: Computing backward predicates...