/usr/bin/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 -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 16:57:30,904 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 16:57:30,907 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 16:57:30,933 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 16:57:30,934 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 16:57:30,935 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 16:57:30,936 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 16:57:30,938 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 16:57:30,939 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 16:57:30,940 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 16:57:30,941 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 16:57:30,942 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-08-22 16:57:30,971 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 [2020-08-22 16:57:30,993 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 16:57:30,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 16:57:30,994 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 16:57:30,994 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 16:57:30,994 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 16:57:30,995 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 16:57:30,995 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 16:57:30,995 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 16:57:30,995 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 16:57:30,995 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 16:57:30,996 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 16:57:30,996 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 16:57:30,996 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 16:57:30,996 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 16:57:30,996 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 16:57:30,997 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 16:57:30,997 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 16:57:30,997 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 16:57:30,997 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 16:57:30,997 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 16:57:30,998 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 16:57:30,998 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 16:57:30,998 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 16:57:30,998 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 16:57:30,998 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 16:57:30,998 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 16:57:30,999 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 16:57:30,999 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 16:57:30,999 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 16:57:30,999 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-08-22 16:57:31,315 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 16:57:31,328 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 16:57:31,332 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 16:57:31,333 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 16:57:31,334 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 16:57:31,335 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-22 16:57:31,398 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed77f9267/91f3d925bb2d4ae4a4e6760878fc6210/FLAG499282950 [2020-08-22 16:57:31,837 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 16:57:31,838 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-22 16:57:31,844 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed77f9267/91f3d925bb2d4ae4a4e6760878fc6210/FLAG499282950 [2020-08-22 16:57:32,241 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed77f9267/91f3d925bb2d4ae4a4e6760878fc6210 [2020-08-22 16:57:32,251 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 16:57:32,253 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 16:57:32,254 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:32,254 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 16:57:32,257 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 16:57:32,258 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,261 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@92e95d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32, skipping insertion in model container [2020-08-22 16:57:32,262 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,269 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 16:57:32,286 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 16:57:32,481 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:32,487 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 16:57:32,504 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 16:57:32,522 INFO L208 MainTranslator]: Completed translation [2020-08-22 16:57:32,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32 WrapperNode [2020-08-22 16:57:32,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 16:57:32,524 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 16:57:32,524 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 16:57:32,524 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 16:57:32,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,540 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,541 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,637 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,646 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (1/1) ... [2020-08-22 16:57:32,649 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 16:57:32,650 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 16:57:32,650 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 16:57:32,650 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 16:57:32,651 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (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 [2020-08-22 16:57:32,705 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 16:57:32,705 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 16:57:32,705 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 16:57:32,706 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 16:57:32,706 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 16:57:32,706 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 16:57:32,706 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 16:57:32,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 16:57:32,707 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 16:57:32,877 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 16:57:32,877 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 16:57:32,880 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:32 BoogieIcfgContainer [2020-08-22 16:57:32,881 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 16:57:32,882 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 16:57:32,882 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 16:57:32,885 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 16:57:32,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 04:57:32" (1/3) ... [2020-08-22 16:57:32,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e79c826 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:32, skipping insertion in model container [2020-08-22 16:57:32,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 04:57:32" (2/3) ... [2020-08-22 16:57:32,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e79c826 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 04:57:32, skipping insertion in model container [2020-08-22 16:57:32,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 04:57:32" (3/3) ... [2020-08-22 16:57:32,892 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-08-22 16:57:32,902 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-08-22 16:57:32,909 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 16:57:32,923 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 16:57:32,943 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 16:57:32,943 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 16:57:32,943 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-08-22 16:57:32,943 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 16:57:32,943 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 16:57:32,943 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 16:57:32,944 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 16:57:32,944 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 16:57:32,959 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 16:57:32,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 16:57:32,964 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:32,964 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:32,965 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:32,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:32,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 16:57:32,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:32,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197066756] [2020-08-22 16:57:32,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:33,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:33,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,169 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:33,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197066756] [2020-08-22 16:57:33,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 16:57:33,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 16:57:33,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687356645] [2020-08-22 16:57:33,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 16:57:33,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:33,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 16:57:33,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 16:57:33,247 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 16:57:33,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:33,285 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 16:57:33,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 16:57:33,287 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 16:57:33,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:33,295 INFO L225 Difference]: With dead ends: 29 [2020-08-22 16:57:33,296 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 16:57:33,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 16:57:33,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 16:57:33,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 16:57:33,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 16:57:33,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 16:57:33,336 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 16:57:33,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:33,337 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 16:57:33,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 16:57:33,337 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 16:57:33,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 16:57:33,338 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:33,338 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:33,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 16:57:33,339 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:33,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:33,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 16:57:33,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:33,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953940844] [2020-08-22 16:57:33,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:33,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:33,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,432 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:33,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953940844] [2020-08-22 16:57:33,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196763156] [2020-08-22 16:57:33,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:33,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2020-08-22 16:57:33,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:33,568 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:33,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:33,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-08-22 16:57:33,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105299557] [2020-08-22 16:57:33,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 16:57:33,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:33,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 16:57:33,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:57:33,572 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2020-08-22 16:57:33,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:33,593 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 16:57:33,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 16:57:33,594 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-08-22 16:57:33,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:33,595 INFO L225 Difference]: With dead ends: 18 [2020-08-22 16:57:33,595 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 16:57:33,597 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 16:57:33,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 16:57:33,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 16:57:33,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 16:57:33,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 16:57:33,602 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 16:57:33,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:33,602 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 16:57:33,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 16:57:33,603 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 16:57:33,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 16:57:33,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:33,604 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:33,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-08-22 16:57:33,818 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:33,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:33,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 16:57:33,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:33,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476873711] [2020-08-22 16:57:33,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:33,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:33,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:33,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:33,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476873711] [2020-08-22 16:57:33,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [349217758] [2020-08-22 16:57:33,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-08-22 16:57:33,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-08-22 16:57:33,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:33,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-08-22 16:57:33,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:34,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:34,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:34,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-08-22 16:57:34,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585386677] [2020-08-22 16:57:34,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 16:57:34,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:34,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 16:57:34,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:57:34,004 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2020-08-22 16:57:34,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:34,030 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 16:57:34,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 16:57:34,031 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-08-22 16:57:34,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:34,032 INFO L225 Difference]: With dead ends: 19 [2020-08-22 16:57:34,032 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 16:57:34,033 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 16:57:34,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 16:57:34,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 16:57:34,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 16:57:34,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 16:57:34,038 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 16:57:34,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:34,038 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 16:57:34,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 16:57:34,038 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 16:57:34,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 16:57:34,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:34,039 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:34,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:34,253 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:34,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:34,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 16:57:34,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:34,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020332180] [2020-08-22 16:57:34,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:34,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:34,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:34,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:34,370 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:34,370 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020332180] [2020-08-22 16:57:34,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077236037] [2020-08-22 16:57:34,371 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-08-22 16:57:34,397 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-08-22 16:57:34,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:34,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2020-08-22 16:57:34,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:34,441 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:34,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:34,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-08-22 16:57:34,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410615073] [2020-08-22 16:57:34,443 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 16:57:34,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:34,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 16:57:34,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:57:34,444 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2020-08-22 16:57:34,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:34,491 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 16:57:34,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 16:57:34,491 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-08-22 16:57:34,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:34,492 INFO L225 Difference]: With dead ends: 20 [2020-08-22 16:57:34,492 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 16:57:34,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 16:57:34,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 16:57:34,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 16:57:34,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 16:57:34,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 16:57:34,498 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 16:57:34,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:34,498 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 16:57:34,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 16:57:34,498 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 16:57:34,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 16:57:34,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:34,499 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:34,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:34,713 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:34,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:34,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 16:57:34,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:34,715 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [426716340] [2020-08-22 16:57:34,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:34,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:34,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:34,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:34,845 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:34,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [426716340] [2020-08-22 16:57:34,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343382498] [2020-08-22 16:57:34,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:34,870 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-08-22 16:57:34,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:34,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2020-08-22 16:57:34,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:34,911 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:34,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:34,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-08-22 16:57:34,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271552970] [2020-08-22 16:57:34,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 16:57:34,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:34,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 16:57:34,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:57:34,913 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2020-08-22 16:57:34,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:34,952 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 16:57:34,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 16:57:34,953 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-08-22 16:57:34,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:34,953 INFO L225 Difference]: With dead ends: 21 [2020-08-22 16:57:34,954 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 16:57:34,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 16:57:34,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 16:57:34,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 16:57:34,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 16:57:34,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 16:57:34,959 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 16:57:34,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:34,959 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 16:57:34,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 16:57:34,959 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 16:57:34,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 16:57:34,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:34,960 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:35,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:35,171 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:35,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:35,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 16:57:35,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:35,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150151906] [2020-08-22 16:57:35,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:35,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:35,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 16:57:35,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 16:57:35,323 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:35,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150151906] [2020-08-22 16:57:35,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89237185] [2020-08-22 16:57:35,324 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-08-22 16:57:35,367 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-08-22 16:57:35,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-08-22 16:57:35,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2020-08-22 16:57:35,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-08-22 16:57:35,407 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 16:57:35,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-08-22 16:57:35,408 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2020-08-22 16:57:35,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648150831] [2020-08-22 16:57:35,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 16:57:35,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-08-22 16:57:35,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 16:57:35,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:57:35,409 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 11 states. [2020-08-22 16:57:35,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 16:57:35,467 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 16:57:35,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 16:57:35,468 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2020-08-22 16:57:35,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 16:57:35,469 INFO L225 Difference]: With dead ends: 22 [2020-08-22 16:57:35,469 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 16:57:35,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-08-22 16:57:35,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 16:57:35,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 16:57:35,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 16:57:35,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 16:57:35,474 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 16:57:35,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 16:57:35,474 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 16:57:35,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 16:57:35,475 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 16:57:35,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 16:57:35,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 16:57:35,476 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 16:57:35,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-08-22 16:57:35,683 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 16:57:35,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 16:57:35,684 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 16:57:35,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-08-22 16:57:35,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499327300] [2020-08-22 16:57:35,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 16:57:35,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:35,704 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:35,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 16:57:35,734 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 16:57:35,768 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-08-22 16:57:35,769 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 16:57:35,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 16:57:35,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 04:57:35 BoogieIcfgContainer [2020-08-22 16:57:35,803 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 16:57:35,812 INFO L168 Benchmark]: Toolchain (without parser) took 3552.79 ms. Allocated memory was 147.8 MB in the beginning and 233.8 MB in the end (delta: 86.0 MB). Free memory was 103.9 MB in the beginning and 137.8 MB in the end (delta: -33.9 MB). Peak memory consumption was 52.1 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,813 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,814 INFO L168 Benchmark]: CACSL2BoogieTranslator took 269.91 ms. Allocated memory is still 147.8 MB. Free memory was 103.5 MB in the beginning and 94.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,815 INFO L168 Benchmark]: Boogie Preprocessor took 125.22 ms. Allocated memory was 147.8 MB in the beginning and 203.4 MB in the end (delta: 55.6 MB). Free memory was 94.3 MB in the beginning and 182.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,816 INFO L168 Benchmark]: RCFGBuilder took 230.89 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 170.5 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,819 INFO L168 Benchmark]: TraceAbstraction took 2921.52 ms. Allocated memory was 203.4 MB in the beginning and 233.8 MB in the end (delta: 30.4 MB). Free memory was 170.5 MB in the beginning and 137.8 MB in the end (delta: 32.6 MB). Peak memory consumption was 63.0 MB. Max. memory is 7.1 GB. [2020-08-22 16:57:35,830 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 269.91 ms. Allocated memory is still 147.8 MB. Free memory was 103.5 MB in the beginning and 94.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.22 ms. Allocated memory was 147.8 MB in the beginning and 203.4 MB in the end (delta: 55.6 MB). Free memory was 94.3 MB in the beginning and 182.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 230.89 ms. Allocated memory is still 203.4 MB. Free memory was 182.4 MB in the beginning and 170.5 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2921.52 ms. Allocated memory was 203.4 MB in the beginning and 233.8 MB in the end (delta: 30.4 MB). Free memory was 170.5 MB in the beginning and 137.8 MB in the end (delta: 32.6 MB). Peak memory consumption was 63.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(x != 6) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.8s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 198 SDs, 0 SdLazy, 151 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 108 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 129 ConstructedInterpolants, 0 QuantifiedInterpolants, 4919 SizeOfPredicates, 5 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 45 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 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...