/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 05:06:24,108 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 05:06:24,111 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 05:06:24,148 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 05:06:24,149 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 05:06:24,151 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 05:06:24,152 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 05:06:24,155 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 05:06:24,157 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 05:06:24,158 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 05:06:24,159 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 05:06:24,161 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 05:06:24,161 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 05:06:24,162 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 05:06:24,164 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 05:06:24,165 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 05:06:24,166 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 05:06:24,167 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 05:06:24,169 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 05:06:24,172 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 05:06:24,173 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 05:06:24,176 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 05:06:24,178 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 05:06:24,179 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 05:06:24,198 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 05:06:24,215 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 05:06:24,216 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 05:06:24,218 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 05:06:24,219 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 05:06:24,243 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 05:06:24,243 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 05:06:24,249 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 05:06:24,249 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 05:06:24,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 05:06:24,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 05:06:24,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 05:06:24,250 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 05:06:24,250 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 05:06:24,250 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 05:06:24,251 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 05:06:24,251 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 05:06:24,251 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 05:06:24,252 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 05:06:24,252 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 05:06:24,252 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 05:06:24,252 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 05:06:24,252 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 05:06:24,253 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 05:06:24,253 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 05:06:24,253 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 05:06:24,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 05:06:24,253 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 05:06:24,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 05:06:24,759 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 05:06:24,763 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 05:06:24,765 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 05:06:24,766 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 05:06:24,767 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-11-07 05:06:24,854 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b0d3ec/6ed9e9aa30f3464d952380b51ce08875/FLAG53b66d2a8 [2020-11-07 05:06:25,471 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 05:06:25,472 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-11-07 05:06:25,480 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b0d3ec/6ed9e9aa30f3464d952380b51ce08875/FLAG53b66d2a8 [2020-11-07 05:06:25,828 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9f0b0d3ec/6ed9e9aa30f3464d952380b51ce08875 [2020-11-07 05:06:25,832 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 05:06:25,839 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 05:06:25,841 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 05:06:25,841 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 05:06:25,846 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 05:06:25,847 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 05:06:25" (1/1) ... [2020-11-07 05:06:25,855 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@230037ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:25, skipping insertion in model container [2020-11-07 05:06:25,855 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 05:06:25" (1/1) ... [2020-11-07 05:06:25,865 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 05:06:25,881 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 05:06:26,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 05:06:26,062 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 05:06:26,081 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 05:06:26,098 INFO L208 MainTranslator]: Completed translation [2020-11-07 05:06:26,099 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26 WrapperNode [2020-11-07 05:06:26,099 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 05:06:26,100 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 05:06:26,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 05:06:26,101 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 05:06:26,114 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,114 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,122 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,122 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,128 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,130 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,132 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (1/1) ... [2020-11-07 05:06:26,134 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 05:06:26,135 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 05:06:26,135 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 05:06:26,135 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 05:06:26,136 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (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 [2020-11-07 05:06:26,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 05:06:26,219 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 05:06:26,220 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 05:06:26,220 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-11-07 05:06:26,221 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-11-07 05:06:26,221 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 05:06:26,222 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-11-07 05:06:26,222 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 05:06:26,222 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 05:06:26,222 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 05:06:26,223 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 05:06:26,223 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-11-07 05:06:26,223 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-11-07 05:06:26,223 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 05:06:26,223 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 05:06:26,224 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 05:06:26,224 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 05:06:26,224 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 05:06:26,225 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 05:06:26,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 05:06:26,594 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 05:06:26,595 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-07 05:06:26,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 05:06:26 BoogieIcfgContainer [2020-11-07 05:06:26,597 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 05:06:26,599 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 05:06:26,599 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 05:06:26,603 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 05:06:26,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 05:06:25" (1/3) ... [2020-11-07 05:06:26,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dab52e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 05:06:26, skipping insertion in model container [2020-11-07 05:06:26,641 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 05:06:26" (2/3) ... [2020-11-07 05:06:26,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@dab52e4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 05:06:26, skipping insertion in model container [2020-11-07 05:06:26,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 05:06:26" (3/3) ... [2020-11-07 05:06:26,644 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-11-07 05:06:26,710 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 05:06:26,716 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 05:06:26,734 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 05:06:26,779 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 05:06:26,780 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 05:06:26,780 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 05:06:26,780 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 05:06:26,780 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 05:06:26,780 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 05:06:26,780 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 05:06:26,781 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 05:06:26,811 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states. [2020-11-07 05:06:26,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-07 05:06:26,826 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:26,828 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:26,829 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:26,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:26,845 INFO L82 PathProgramCache]: Analyzing trace with hash 138014369, now seen corresponding path program 1 times [2020-11-07 05:06:26,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:26,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [541837180] [2020-11-07 05:06:26,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:27,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:27,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 05:06:27,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:27,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-07 05:06:27,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:27,271 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 05:06:27,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [541837180] [2020-11-07 05:06:27,274 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 05:06:27,275 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 05:06:27,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765772579] [2020-11-07 05:06:27,281 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 05:06:27,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 05:06:27,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 05:06:27,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 05:06:27,303 INFO L87 Difference]: Start difference. First operand 50 states. Second operand 6 states. [2020-11-07 05:06:27,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 05:06:27,763 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2020-11-07 05:06:27,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 05:06:27,766 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-11-07 05:06:27,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 05:06:27,779 INFO L225 Difference]: With dead ends: 64 [2020-11-07 05:06:27,780 INFO L226 Difference]: Without dead ends: 45 [2020-11-07 05:06:27,783 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-07 05:06:27,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-07 05:06:27,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-11-07 05:06:27,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-11-07 05:06:27,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-11-07 05:06:27,869 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 25 [2020-11-07 05:06:27,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 05:06:27,870 INFO L481 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-11-07 05:06:27,870 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 05:06:27,870 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-11-07 05:06:27,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-07 05:06:27,873 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:27,873 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:27,874 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 05:06:27,874 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:27,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:27,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1111577060, now seen corresponding path program 1 times [2020-11-07 05:06:27,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:27,876 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63679852] [2020-11-07 05:06:27,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:27,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 05:06:28,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-07 05:06:28,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:28,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 05:06:28,214 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63679852] [2020-11-07 05:06:28,215 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 05:06:28,215 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 05:06:28,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709161121] [2020-11-07 05:06:28,218 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 05:06:28,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 05:06:28,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 05:06:28,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 05:06:28,223 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 6 states. [2020-11-07 05:06:28,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 05:06:28,596 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2020-11-07 05:06:28,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 05:06:28,597 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-11-07 05:06:28,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 05:06:28,599 INFO L225 Difference]: With dead ends: 73 [2020-11-07 05:06:28,599 INFO L226 Difference]: Without dead ends: 53 [2020-11-07 05:06:28,601 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-07 05:06:28,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-07 05:06:28,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-11-07 05:06:28,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-07 05:06:28,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-11-07 05:06:28,619 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 34 [2020-11-07 05:06:28,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 05:06:28,619 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-11-07 05:06:28,620 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 05:06:28,620 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-11-07 05:06:28,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-07 05:06:28,621 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:28,622 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:28,622 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 05:06:28,622 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:28,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:28,623 INFO L82 PathProgramCache]: Analyzing trace with hash 982288804, now seen corresponding path program 1 times [2020-11-07 05:06:28,623 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:28,624 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881844731] [2020-11-07 05:06:28,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:28,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 05:06:28,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-07 05:06:28,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:28,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:28,819 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 05:06:28,819 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881844731] [2020-11-07 05:06:28,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 05:06:28,820 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-07 05:06:28,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189498208] [2020-11-07 05:06:28,821 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-07 05:06:28,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 05:06:28,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-07 05:06:28,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-07 05:06:28,822 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 9 states. [2020-11-07 05:06:29,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 05:06:29,347 INFO L93 Difference]: Finished difference Result 59 states and 63 transitions. [2020-11-07 05:06:29,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 05:06:29,348 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2020-11-07 05:06:29,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 05:06:29,350 INFO L225 Difference]: With dead ends: 59 [2020-11-07 05:06:29,350 INFO L226 Difference]: Without dead ends: 53 [2020-11-07 05:06:29,351 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-11-07 05:06:29,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-07 05:06:29,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-11-07 05:06:29,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-11-07 05:06:29,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2020-11-07 05:06:29,367 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 34 [2020-11-07 05:06:29,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 05:06:29,367 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2020-11-07 05:06:29,367 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-07 05:06:29,367 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2020-11-07 05:06:29,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-07 05:06:29,369 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:29,369 INFO L422 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:29,370 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 05:06:29,370 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:29,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:29,371 INFO L82 PathProgramCache]: Analyzing trace with hash 935446002, now seen corresponding path program 1 times [2020-11-07 05:06:29,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:29,371 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662448401] [2020-11-07 05:06:29,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:29,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 05:06:29,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-07 05:06:29,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:29,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:29,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,549 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-07 05:06:29,550 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662448401] [2020-11-07 05:06:29,550 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 05:06:29,550 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-07 05:06:29,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522928489] [2020-11-07 05:06:29,551 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 05:06:29,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 05:06:29,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 05:06:29,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 05:06:29,552 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 6 states. [2020-11-07 05:06:29,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 05:06:29,879 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2020-11-07 05:06:29,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 05:06:29,879 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 43 [2020-11-07 05:06:29,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 05:06:29,881 INFO L225 Difference]: With dead ends: 79 [2020-11-07 05:06:29,881 INFO L226 Difference]: Without dead ends: 59 [2020-11-07 05:06:29,882 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-07 05:06:29,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-11-07 05:06:29,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-11-07 05:06:29,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-07 05:06:29,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-11-07 05:06:29,898 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 43 [2020-11-07 05:06:29,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 05:06:29,898 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-11-07 05:06:29,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 05:06:29,899 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-11-07 05:06:29,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-07 05:06:29,900 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:29,900 INFO L422 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:29,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 05:06:29,901 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:29,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:29,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1355534926, now seen corresponding path program 1 times [2020-11-07 05:06:29,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:29,902 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481335393] [2020-11-07 05:06:29,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:29,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 05:06:29,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:29,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-07 05:06:29,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:30,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:30,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:30,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-07 05:06:30,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 05:06:30,096 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-11-07 05:06:30,096 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481335393] [2020-11-07 05:06:30,097 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 05:06:30,097 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-07 05:06:30,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928576055] [2020-11-07 05:06:30,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-07 05:06:30,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 05:06:30,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-07 05:06:30,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-07 05:06:30,099 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 9 states. [2020-11-07 05:06:30,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 05:06:30,770 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2020-11-07 05:06:30,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 05:06:30,771 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 43 [2020-11-07 05:06:30,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 05:06:30,772 INFO L225 Difference]: With dead ends: 85 [2020-11-07 05:06:30,772 INFO L226 Difference]: Without dead ends: 65 [2020-11-07 05:06:30,773 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-11-07 05:06:30,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-11-07 05:06:30,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-11-07 05:06:30,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-11-07 05:06:30,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2020-11-07 05:06:30,792 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 43 [2020-11-07 05:06:30,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 05:06:30,792 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2020-11-07 05:06:30,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-07 05:06:30,792 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2020-11-07 05:06:30,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-07 05:06:30,794 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 05:06:30,794 INFO L422 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 05:06:30,794 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 05:06:30,794 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 05:06:30,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 05:06:30,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1484823182, now seen corresponding path program 1 times [2020-11-07 05:06:30,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 05:06:30,795 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1503002119] [2020-11-07 05:06:30,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 05:06:30,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 05:06:30,813 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 05:06:30,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 05:06:30,828 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 05:06:30,869 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 05:06:30,870 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 05:06:30,870 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 05:06:30,928 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 05:06:30 BoogieIcfgContainer [2020-11-07 05:06:30,928 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 05:06:30,931 INFO L168 Benchmark]: Toolchain (without parser) took 5095.55 ms. Allocated memory was 160.4 MB in the beginning and 201.3 MB in the end (delta: 40.9 MB). Free memory was 136.9 MB in the beginning and 133.7 MB in the end (delta: 3.2 MB). Peak memory consumption was 45.1 MB. Max. memory is 8.0 GB. [2020-11-07 05:06:30,932 INFO L168 Benchmark]: CDTParser took 0.46 ms. Allocated memory is still 160.4 MB. Free memory was 135.9 MB in the beginning and 135.8 MB in the end (delta: 102.3 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 05:06:30,933 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.18 ms. Allocated memory is still 160.4 MB. Free memory was 136.3 MB in the beginning and 127.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-07 05:06:30,934 INFO L168 Benchmark]: Boogie Preprocessor took 33.98 ms. Allocated memory is still 160.4 MB. Free memory was 127.2 MB in the beginning and 125.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-07 05:06:30,934 INFO L168 Benchmark]: RCFGBuilder took 461.68 ms. Allocated memory is still 160.4 MB. Free memory was 125.6 MB in the beginning and 110.9 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-11-07 05:06:30,936 INFO L168 Benchmark]: TraceAbstraction took 4329.37 ms. Allocated memory was 160.4 MB in the beginning and 201.3 MB in the end (delta: 40.9 MB). Free memory was 110.5 MB in the beginning and 133.7 MB in the end (delta: -23.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. [2020-11-07 05:06:30,940 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.46 ms. Allocated memory is still 160.4 MB. Free memory was 135.9 MB in the beginning and 135.8 MB in the end (delta: 102.3 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 258.18 ms. Allocated memory is still 160.4 MB. Free memory was 136.3 MB in the beginning and 127.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.98 ms. Allocated memory is still 160.4 MB. Free memory was 127.2 MB in the beginning and 125.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 461.68 ms. Allocated memory is still 160.4 MB. Free memory was 125.6 MB in the beginning and 110.9 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 4329.37 ms. Allocated memory was 160.4 MB in the beginning and 201.3 MB in the end (delta: 40.9 MB). Free memory was 110.5 MB in the beginning and 133.7 MB in the end (delta: -23.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] unsigned int input = __VERIFIER_nondet_uint(); VAL [__VERIFIER_nondet_uint()=2, input=2] [L25] CALL, EXPR id(input) VAL [\old(x)=2] [L10] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L17] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L18] CALL, EXPR id(x-1) VAL [\old(x)=0] [L10] COND TRUE x==0 VAL [\old(x)=0, x=0] [L10] return 0; VAL [\old(x)=0, \result=0, x=0] [L18] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L18] unsigned int ret = id(x-1) + 1; VAL [\old(x)=1, id(x-1)=0, ret=1, x=1] [L19] COND FALSE !(ret > 3) VAL [\old(x)=1, ret=1, x=1] [L20] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L11] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L11] unsigned int ret = id2(x-1) + 1; VAL [\old(x)=2, id2(x-1)=1, ret=2, x=2] [L12] COND FALSE !(ret > 3) VAL [\old(x)=2, ret=2, x=2] [L13] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L25] RET, EXPR id(input) VAL [id(input)=2, input=2] [L25] unsigned int result = id(input); VAL [id(input)=2, input=2, result=2] [L26] COND TRUE result == 2 VAL [input=2, result=2] [L27] CALL reach_error() [L4] __assert_fail("0", "id2_b3_o2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 50 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.0s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 215 SDtfs, 191 SDslu, 358 SDs, 0 SdLazy, 784 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 95 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=62occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 11 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 222 NumberOfCodeBlocks, 222 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 174 ConstructedInterpolants, 0 QuantifiedInterpolants, 20334 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...