/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 --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:28:53,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:28:53,462 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:28:53,488 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:28:53,489 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:28:53,490 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:28:53,492 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:28:53,494 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:28:53,495 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:28:53,497 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:28:53,498 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:28:53,499 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:28:53,499 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:28:53,501 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:28:53,502 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:28:53,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:28:53,504 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:28:53,506 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:28:53,511 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:28:53,515 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:28:53,516 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:28:53,521 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:28:53,522 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:28:53,524 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:28:53,526 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:28:53,530 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:28:53,531 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:28:53,532 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:28:53,533 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:28:53,534 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:28:53,534 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:28:53,535 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:28:53,535 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:28:53,535 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:28:53,537 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:28:53,538 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:28:53,538 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 [2020-09-21 10:28:53,570 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:28:53,570 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:28:53,571 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:28:53,572 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:28:53,572 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:28:53,572 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:28:53,572 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:28:53,573 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:28:53,573 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:28:53,573 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:28:53,573 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:28:53,573 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:28:53,574 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:28:53,574 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:28:53,574 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:28:53,574 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:28:53,574 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:28:53,575 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:28:53,575 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:28:53,575 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:28:53,575 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:28:53,576 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:53,576 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:28:53,576 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:28:53,576 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:28:53,577 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:28:53,577 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:28:53,577 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:28:53,577 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:28:53,577 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:28:54,041 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:28:54,059 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:28:54,064 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:28:54,066 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:28:54,067 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:28:54,069 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-09-21 10:28:54,150 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f85cac643/a6be838b4e5d4e26aa65d6b5eddbea95/FLAGe66b15909 [2020-09-21 10:28:54,705 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:28:54,706 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-09-21 10:28:54,717 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f85cac643/a6be838b4e5d4e26aa65d6b5eddbea95/FLAGe66b15909 [2020-09-21 10:28:55,024 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f85cac643/a6be838b4e5d4e26aa65d6b5eddbea95 [2020-09-21 10:28:55,040 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:28:55,046 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:28:55,047 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:55,047 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:28:55,052 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:28:55,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,057 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42dfe0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55, skipping insertion in model container [2020-09-21 10:28:55,058 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,067 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:28:55,095 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:28:55,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:55,351 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:28:55,385 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:55,411 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:28:55,412 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55 WrapperNode [2020-09-21 10:28:55,412 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:55,413 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:28:55,413 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:28:55,413 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:28:55,505 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,506 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,518 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,519 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,531 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,541 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (1/1) ... [2020-09-21 10:28:55,544 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:28:55,545 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:28:55,545 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:28:55,545 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:28:55,546 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (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 [2020-09-21 10:28:55,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:28:55,621 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:28:55,621 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-21 10:28:55,621 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:28:55,621 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:28:55,621 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:28:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:28:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-21 10:28:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:28:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-21 10:28:55,622 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:28:55,623 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:28:55,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:28:55,623 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:28:55,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:28:55,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:28:55,624 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:28:55,953 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:28:55,954 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-09-21 10:28:55,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:55 BoogieIcfgContainer [2020-09-21 10:28:55,960 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:28:55,962 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:28:55,964 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:28:55,968 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:28:55,968 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:28:55" (1/3) ... [2020-09-21 10:28:55,969 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b51ed06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:55, skipping insertion in model container [2020-09-21 10:28:55,969 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:55" (2/3) ... [2020-09-21 10:28:55,970 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b51ed06 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:55, skipping insertion in model container [2020-09-21 10:28:55,970 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:55" (3/3) ... [2020-09-21 10:28:55,972 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-09-21 10:28:55,986 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:28:55,998 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:28:56,023 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:28:56,071 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:28:56,071 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:28:56,072 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:28:56,072 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:28:56,072 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:28:56,072 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:28:56,072 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:28:56,072 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:28:56,112 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-09-21 10:28:56,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 10:28:56,120 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,121 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,122 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,129 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-09-21 10:28:56,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640050537] [2020-09-21 10:28:56,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:56,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:56,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:56,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640050537] [2020-09-21 10:28:56,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:56,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-09-21 10:28:56,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732230898] [2020-09-21 10:28:56,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 10:28:56,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:56,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 10:28:56,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:56,424 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-09-21 10:28:56,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:56,648 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-09-21 10:28:56,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 10:28:56,652 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-09-21 10:28:56,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:56,668 INFO L225 Difference]: With dead ends: 73 [2020-09-21 10:28:56,669 INFO L226 Difference]: Without dead ends: 36 [2020-09-21 10:28:56,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 10:28:56,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-21 10:28:56,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-09-21 10:28:56,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-21 10:28:56,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-09-21 10:28:56,748 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-09-21 10:28:56,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:56,749 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-09-21 10:28:56,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 10:28:56,750 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-09-21 10:28:56,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-09-21 10:28:56,752 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,752 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:28:56,753 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,753 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-09-21 10:28:56,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671212365] [2020-09-21 10:28:56,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:56,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:56,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,847 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:28:56,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671212365] [2020-09-21 10:28:56,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:56,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-21 10:28:56,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871251882] [2020-09-21 10:28:56,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:56,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:56,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:56,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:56,852 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-09-21 10:28:56,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:56,966 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-09-21 10:28:56,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 10:28:56,967 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-09-21 10:28:56,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:56,969 INFO L225 Difference]: With dead ends: 65 [2020-09-21 10:28:56,969 INFO L226 Difference]: Without dead ends: 44 [2020-09-21 10:28:56,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:56,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-09-21 10:28:56,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-09-21 10:28:56,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-09-21 10:28:56,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-09-21 10:28:56,979 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-09-21 10:28:56,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:56,980 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-09-21 10:28:56,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:56,980 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-09-21 10:28:56,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-21 10:28:56,981 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,982 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:28:56,982 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,983 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-09-21 10:28:56,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901345929] [2020-09-21 10:28:56,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:57,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:57,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,080 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-21 10:28:57,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901345929] [2020-09-21 10:28:57,081 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:57,081 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-09-21 10:28:57,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133274582] [2020-09-21 10:28:57,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-09-21 10:28:57,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:57,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-09-21 10:28:57,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:57,085 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-09-21 10:28:57,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:57,291 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-09-21 10:28:57,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:57,292 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-09-21 10:28:57,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:57,293 INFO L225 Difference]: With dead ends: 75 [2020-09-21 10:28:57,293 INFO L226 Difference]: Without dead ends: 52 [2020-09-21 10:28:57,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:57,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-09-21 10:28:57,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-09-21 10:28:57,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-09-21 10:28:57,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-09-21 10:28:57,309 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-09-21 10:28:57,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:57,310 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-09-21 10:28:57,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-09-21 10:28:57,310 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-09-21 10:28:57,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-21 10:28:57,312 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:57,312 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:57,313 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:28:57,313 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:57,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:57,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-09-21 10:28:57,314 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:57,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907276157] [2020-09-21 10:28:57,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:57,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:57,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,430 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-21 10:28:57,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907276157] [2020-09-21 10:28:57,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:57,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:28:57,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871337295] [2020-09-21 10:28:57,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:28:57,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:57,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:28:57,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:57,433 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-09-21 10:28:57,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:57,600 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-09-21 10:28:57,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 10:28:57,601 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-09-21 10:28:57,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:57,602 INFO L225 Difference]: With dead ends: 85 [2020-09-21 10:28:57,602 INFO L226 Difference]: Without dead ends: 60 [2020-09-21 10:28:57,604 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:57,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-09-21 10:28:57,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-09-21 10:28:57,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-09-21 10:28:57,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-09-21 10:28:57,613 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-09-21 10:28:57,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:57,613 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-09-21 10:28:57,613 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:28:57,613 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-09-21 10:28:57,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-09-21 10:28:57,615 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:57,615 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:57,615 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:28:57,615 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:57,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:57,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-09-21 10:28:57,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:57,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395128768] [2020-09-21 10:28:57,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:57,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:57,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:57,723 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-09-21 10:28:57,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395128768] [2020-09-21 10:28:57,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:57,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:57,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449800669] [2020-09-21 10:28:57,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:57,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:57,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:57,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:57,726 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-09-21 10:28:57,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:57,871 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-09-21 10:28:57,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-21 10:28:57,872 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-09-21 10:28:57,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:57,873 INFO L225 Difference]: With dead ends: 93 [2020-09-21 10:28:57,873 INFO L226 Difference]: Without dead ends: 66 [2020-09-21 10:28:57,874 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:57,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-09-21 10:28:57,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-09-21 10:28:57,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:28:57,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-09-21 10:28:57,882 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-09-21 10:28:57,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:57,882 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-09-21 10:28:57,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:57,883 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-09-21 10:28:57,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-21 10:28:57,884 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:57,884 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:57,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:28:57,885 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:57,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:57,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-09-21 10:28:57,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:57,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1552058963] [2020-09-21 10:28:57,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:57,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 10:28:57,957 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 10:28:57,958 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 10:28:57,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:28:57,988 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:28:57 BoogieIcfgContainer [2020-09-21 10:28:57,988 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:28:57,992 INFO L168 Benchmark]: Toolchain (without parser) took 2948.55 ms. Allocated memory was 139.5 MB in the beginning and 234.9 MB in the end (delta: 95.4 MB). Free memory was 101.4 MB in the beginning and 129.8 MB in the end (delta: -28.4 MB). Peak memory consumption was 67.0 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:57,993 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 139.5 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-21 10:28:57,993 INFO L168 Benchmark]: CACSL2BoogieTranslator took 365.43 ms. Allocated memory is still 139.5 MB. Free memory was 100.8 MB in the beginning and 90.2 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:57,995 INFO L168 Benchmark]: Boogie Preprocessor took 131.46 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 90.0 MB in the beginning and 179.1 MB in the end (delta: -89.1 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:57,995 INFO L168 Benchmark]: RCFGBuilder took 415.51 ms. Allocated memory is still 201.9 MB. Free memory was 179.1 MB in the beginning and 159.8 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:57,996 INFO L168 Benchmark]: TraceAbstraction took 2026.25 ms. Allocated memory was 201.9 MB in the beginning and 234.9 MB in the end (delta: 33.0 MB). Free memory was 159.1 MB in the beginning and 129.8 MB in the end (delta: 29.3 MB). Peak memory consumption was 62.3 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:58,000 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 139.5 MB. Free memory was 119.7 MB in the beginning and 119.5 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 365.43 ms. Allocated memory is still 139.5 MB. Free memory was 100.8 MB in the beginning and 90.2 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 131.46 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 90.0 MB in the beginning and 179.1 MB in the end (delta: -89.1 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 415.51 ms. Allocated memory is still 201.9 MB. Free memory was 179.1 MB in the beginning and 159.8 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2026.25 ms. Allocated memory was 201.9 MB in the beginning and 234.9 MB in the end (delta: 33.0 MB). Free memory was 159.1 MB in the beginning and 129.8 MB in the end (delta: 29.3 MB). Peak memory consumption was 62.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND FALSE !(i<5) [L26] EXPR string_A[5 -1] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND FALSE !(i<5) [L30] EXPR string_B[5 -1] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 [L33] EXPR string_A[nc_A] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 [L37] EXPR string_B[nc_B] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 [L44] COND FALSE !((inc_B-1)<