/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 0.1.25-3af5e1f [2020-09-04 13:43:41,927 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:43:41,932 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:43:41,974 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:43:41,974 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:43:41,977 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:43:41,978 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:43:41,984 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:43:41,989 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:43:41,990 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:43:41,991 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:43:41,992 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:43:41,993 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:43:41,994 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:43:41,995 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:43:41,996 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:43:41,997 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:43:41,998 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:43:41,999 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:43:42,001 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:43:42,003 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:43:42,004 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:43:42,005 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:43:42,006 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:43:42,009 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:43:42,016 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:43:42,017 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:43:42,018 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:43:42,019 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:43:42,047 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:43:42,047 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:43:42,049 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:43:42,049 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:43:42,049 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:43:42,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:43:42,050 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:43:42,050 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:43:42,050 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:43:42,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:43:42,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:43:42,051 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:43:42,051 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:43:42,051 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:43:42,051 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:43:42,051 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:43:42,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:43:42,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:43:42,052 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:43:42,052 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:43:42,052 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:43:42,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:43:42,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:43:42,053 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:43:42,053 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:43:42,054 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:43:42,054 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:43:42,054 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:43:42,054 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:43:42,054 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:43:42,542 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:43:42,569 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:43:42,573 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:43:42,575 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:43:42,575 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:43:42,577 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-04 13:43:42,650 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4724e2306/3d4e8224708646e1b41e800a368d9dc1/FLAG122b247ad [2020-09-04 13:43:43,194 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:43:43,195 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-09-04 13:43:43,203 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4724e2306/3d4e8224708646e1b41e800a368d9dc1/FLAG122b247ad [2020-09-04 13:43:43,530 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4724e2306/3d4e8224708646e1b41e800a368d9dc1 [2020-09-04 13:43:43,546 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:43:43,549 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:43:43,551 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:43,552 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:43:43,556 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:43:43,557 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,563 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@55b47f15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43, skipping insertion in model container [2020-09-04 13:43:43,563 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,573 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:43:43,600 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:43:43,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:43,837 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:43:43,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:43,875 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:43:43,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43 WrapperNode [2020-09-04 13:43:43,875 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:43,876 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:43:43,877 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:43:43,877 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:43:43,894 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,895 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,978 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,978 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,983 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,991 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,992 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... [2020-09-04 13:43:43,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:43:43,994 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:43:43,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:43:43,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:43:43,995 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:44,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:43:44,065 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:43:44,065 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 13:43:44,066 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:43:44,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:43:44,066 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 13:43:44,066 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:43:44,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:43:44,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:43:44,269 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:43:44,270 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 13:43:44,275 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:44 BoogieIcfgContainer [2020-09-04 13:43:44,275 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:43:44,277 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:43:44,277 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:43:44,281 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:43:44,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:43:43" (1/3) ... [2020-09-04 13:43:44,282 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d4e35f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:44, skipping insertion in model container [2020-09-04 13:43:44,282 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:43" (2/3) ... [2020-09-04 13:43:44,283 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d4e35f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:44, skipping insertion in model container [2020-09-04 13:43:44,283 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:44" (3/3) ... [2020-09-04 13:43:44,285 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-09-04 13:43:44,297 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:43:44,308 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:43:44,328 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:43:44,353 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:43:44,354 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:43:44,354 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:43:44,354 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:43:44,354 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:43:44,355 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:43:44,355 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:43:44,355 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:43:44,374 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-09-04 13:43:44,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-04 13:43:44,381 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:44,382 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:44,383 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:44,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:44,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-09-04 13:43:44,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:44,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189479853] [2020-09-04 13:43:44,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:44,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:44,717 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 13 DAG size of output: 5 [2020-09-04 13:43:44,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:44,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:44,727 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:44,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189479853] [2020-09-04 13:43:44,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:44,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 13:43:44,731 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229195434] [2020-09-04 13:43:44,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 13:43:44,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:44,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 13:43:44,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 13:43:44,765 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-09-04 13:43:44,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:44,798 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-09-04 13:43:44,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 13:43:44,801 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-09-04 13:43:44,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:44,811 INFO L225 Difference]: With dead ends: 29 [2020-09-04 13:43:44,811 INFO L226 Difference]: Without dead ends: 12 [2020-09-04 13:43:44,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 13:43:44,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-09-04 13:43:44,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-09-04 13:43:44,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-09-04 13:43:44,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-09-04 13:43:44,855 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-09-04 13:43:44,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:44,855 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-09-04 13:43:44,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 13:43:44,856 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-09-04 13:43:44,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-09-04 13:43:44,857 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:44,857 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:44,857 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:43:44,857 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:44,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:44,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-09-04 13:43:44,858 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:44,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376382687] [2020-09-04 13:43:44,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:44,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:44,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:44,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:44,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:44,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376382687] [2020-09-04 13:43:44,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797803665] [2020-09-04 13:43:44,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:44,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:44,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2020-09-04 13:43:44,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:45,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:45,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:45,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-09-04 13:43:45,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075042404] [2020-09-04 13:43:45,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:43:45,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:45,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:43:45,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:43:45,110 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 5 states. [2020-09-04 13:43:45,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:45,135 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-09-04 13:43:45,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-04 13:43:45,136 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-09-04 13:43:45,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:45,137 INFO L225 Difference]: With dead ends: 18 [2020-09-04 13:43:45,137 INFO L226 Difference]: Without dead ends: 13 [2020-09-04 13:43:45,139 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 [2020-09-04 13:43:45,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-09-04 13:43:45,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-09-04 13:43:45,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-09-04 13:43:45,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-09-04 13:43:45,144 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-09-04 13:43:45,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:45,144 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-09-04 13:43:45,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:43:45,145 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-09-04 13:43:45,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-09-04 13:43:45,145 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:45,146 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:45,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:43:45,355 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:45,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:45,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-09-04 13:43:45,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:45,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473012434] [2020-09-04 13:43:45,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:45,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:45,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:45,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:45,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:45,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473012434] [2020-09-04 13:43:45,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992808128] [2020-09-04 13:43:45,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:45,493 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:43:45,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:45,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-09-04 13:43:45,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:45,541 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:45,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:45,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-09-04 13:43:45,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324927743] [2020-09-04 13:43:45,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-04 13:43:45,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:45,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-04 13:43:45,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:43:45,543 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 6 states. [2020-09-04 13:43:45,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:45,567 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-09-04 13:43:45,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:43:45,568 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-09-04 13:43:45,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:45,569 INFO L225 Difference]: With dead ends: 19 [2020-09-04 13:43:45,569 INFO L226 Difference]: Without dead ends: 14 [2020-09-04 13:43:45,570 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 [2020-09-04 13:43:45,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-04 13:43:45,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-04 13:43:45,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-04 13:43:45,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-09-04 13:43:45,574 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-09-04 13:43:45,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:45,575 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-09-04 13:43:45,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-04 13:43:45,575 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-09-04 13:43:45,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-04 13:43:45,576 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:45,576 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:45,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:45,789 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:45,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:45,790 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-09-04 13:43:45,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:45,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2119834218] [2020-09-04 13:43:45,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:45,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:45,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:45,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:45,938 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:45,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2119834218] [2020-09-04 13:43:45,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963284458] [2020-09-04 13:43:45,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-09-04 13:43:45,979 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-09-04 13:43:45,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:45,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 9 conjunts are in the unsatisfiable core [2020-09-04 13:43:45,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:46,022 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:46,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:46,022 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-09-04 13:43:46,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602763203] [2020-09-04 13:43:46,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:43:46,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:46,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:43:46,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:43:46,025 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 7 states. [2020-09-04 13:43:46,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:46,063 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-09-04 13:43:46,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:43:46,064 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-09-04 13:43:46,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:46,065 INFO L225 Difference]: With dead ends: 20 [2020-09-04 13:43:46,065 INFO L226 Difference]: Without dead ends: 15 [2020-09-04 13:43:46,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:43:46,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-09-04 13:43:46,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-09-04 13:43:46,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-09-04 13:43:46,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-09-04 13:43:46,071 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-09-04 13:43:46,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:46,071 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-09-04 13:43:46,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:43:46,072 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-09-04 13:43:46,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-04 13:43:46,073 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:46,073 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:46,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:46,287 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:46,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:46,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-09-04 13:43:46,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:46,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869489753] [2020-09-04 13:43:46,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:46,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:46,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:46,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:46,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869489753] [2020-09-04 13:43:46,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489079168] [2020-09-04 13:43:46,458 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:46,489 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:43:46,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:46,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2020-09-04 13:43:46,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:46,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:46,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:46,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-09-04 13:43:46,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887659581] [2020-09-04 13:43:46,530 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:43:46,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:46,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:43:46,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:43:46,531 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 8 states. [2020-09-04 13:43:46,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:46,572 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-09-04 13:43:46,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:43:46,573 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-09-04 13:43:46,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:46,574 INFO L225 Difference]: With dead ends: 21 [2020-09-04 13:43:46,574 INFO L226 Difference]: Without dead ends: 16 [2020-09-04 13:43:46,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:43:46,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-09-04 13:43:46,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-09-04 13:43:46,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-09-04 13:43:46,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-09-04 13:43:46,579 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-09-04 13:43:46,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:46,579 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-09-04 13:43:46,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:43:46,580 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-09-04 13:43:46,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-04 13:43:46,580 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:46,581 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:46,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:46,794 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:46,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:46,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-09-04 13:43:46,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:46,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272687878] [2020-09-04 13:43:46,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:46,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:46,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:46,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:46,961 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:46,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272687878] [2020-09-04 13:43:46,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009388474] [2020-09-04 13:43:46,963 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:47,003 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-09-04 13:43:47,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:47,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 13 conjunts are in the unsatisfiable core [2020-09-04 13:43:47,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:47,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:47,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2020-09-04 13:43:47,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290214457] [2020-09-04 13:43:47,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 13:43:47,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:47,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 13:43:47,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2020-09-04 13:43:47,086 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 11 states. [2020-09-04 13:43:47,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:47,163 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-09-04 13:43:47,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 13:43:47,164 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2020-09-04 13:43:47,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:47,165 INFO L225 Difference]: With dead ends: 22 [2020-09-04 13:43:47,165 INFO L226 Difference]: Without dead ends: 17 [2020-09-04 13:43:47,166 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 [2020-09-04 13:43:47,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-09-04 13:43:47,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-09-04 13:43:47,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-09-04 13:43:47,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-09-04 13:43:47,172 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-09-04 13:43:47,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:47,174 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-09-04 13:43:47,174 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 13:43:47,175 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-09-04 13:43:47,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-09-04 13:43:47,176 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:47,177 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:47,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-09-04 13:43:47,388 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:47,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:47,389 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-09-04 13:43:47,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:47,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591400445] [2020-09-04 13:43:47,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:47,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:47,407 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:47,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:47,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:47,439 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:43:47,439 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:43:47,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 13:43:47,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:43:47 BoogieIcfgContainer [2020-09-04 13:43:47,468 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:43:47,470 INFO L168 Benchmark]: Toolchain (without parser) took 3921.84 ms. Allocated memory was 140.0 MB in the beginning and 234.9 MB in the end (delta: 94.9 MB). Free memory was 102.7 MB in the beginning and 142.8 MB in the end (delta: -40.1 MB). Peak memory consumption was 54.8 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,471 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.1 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,472 INFO L168 Benchmark]: CACSL2BoogieTranslator took 324.65 ms. Allocated memory is still 140.0 MB. Free memory was 102.3 MB in the beginning and 93.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,473 INFO L168 Benchmark]: Boogie Preprocessor took 117.21 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.2 MB in the beginning and 181.3 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,474 INFO L168 Benchmark]: RCFGBuilder took 281.56 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 169.9 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,475 INFO L168 Benchmark]: TraceAbstraction took 3191.14 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 168.9 MB in the beginning and 142.8 MB in the end (delta: 26.2 MB). Peak memory consumption was 58.7 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:47,479 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.1 MB in the end (delta: 419.7 kB). Peak memory consumption was 419.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 324.65 ms. Allocated memory is still 140.0 MB. Free memory was 102.3 MB in the beginning and 93.2 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.21 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 93.2 MB in the beginning and 181.3 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 281.56 ms. Allocated memory is still 202.4 MB. Free memory was 181.3 MB in the beginning and 169.9 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3191.14 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 168.9 MB in the beginning and 142.8 MB in the end (delta: 26.2 MB). Peak memory consumption was 58.7 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: 3.0s, 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, 0.6s 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, 0.2s SatisfiabilityAnalysisTime, 1.0s 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...