/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 23:01:22,289 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 23:01:22,292 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 23:01:22,336 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 23:01:22,346 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 23:01:22,347 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 23:01:22,348 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 23:01:22,350 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 23:01:22,351 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 23:01:22,352 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 23:01:22,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 23:01:22,356 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 23:01:22,357 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 23:01:22,361 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 23:01:22,366 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 23:01:22,367 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 23:01:22,371 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 23:01:22,385 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 23:01:22,387 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 23:01:22,388 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 23:01:22,389 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 23:01:22,404 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 23:01:22,404 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 23:01:22,406 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 23:01:22,407 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 23:01:22,407 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 23:01:22,407 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 23:01:22,407 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 23:01:22,408 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 23:01:22,408 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 23:01:22,408 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 23:01:22,409 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 23:01:22,409 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 23:01:22,409 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 23:01:22,410 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 23:01:22,410 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 23:01:22,410 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 23:01:22,411 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 23:01:22,411 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 23:01:22,411 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:22,411 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 23:01:22,411 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 23:01:22,412 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 23:01:22,412 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 23:01:22,690 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 23:01:22,702 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 23:01:22,706 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 23:01:22,708 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 23:01:22,708 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 23:01:22,709 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-08-22 23:01:22,775 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce785a56a/0b418de6e96b4befbf56eead57abd9af/FLAGc02c5bcd9 [2020-08-22 23:01:23,268 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 23:01:23,271 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-08-22 23:01:23,280 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce785a56a/0b418de6e96b4befbf56eead57abd9af/FLAGc02c5bcd9 [2020-08-22 23:01:23,600 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ce785a56a/0b418de6e96b4befbf56eead57abd9af [2020-08-22 23:01:23,611 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 23:01:23,615 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 23:01:23,616 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:23,616 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 23:01:23,621 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 23:01:23,622 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,626 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72d11499 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23, skipping insertion in model container [2020-08-22 23:01:23,626 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:23,634 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 23:01:23,654 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 23:01:23,880 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:23,884 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 23:01:23,911 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 23:01:23,933 INFO L208 MainTranslator]: Completed translation [2020-08-22 23:01:23,934 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23 WrapperNode [2020-08-22 23:01:23,934 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 23:01:23,935 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 23:01:23,935 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 23:01:23,935 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 23:01:24,020 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,034 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,034 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,047 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,053 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... [2020-08-22 23:01:24,065 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 23:01:24,066 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 23:01:24,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 23:01:24,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 23:01:24,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 23:01:24,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 23:01:24,135 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 23:01:24,135 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 23:01:24,136 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 23:01:24,136 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 23:01:24,136 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 23:01:24,137 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 23:01:24,137 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 23:01:24,137 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 23:01:24,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 23:01:24,137 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 23:01:24,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 23:01:24,593 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 23:01:24,595 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-22 23:01:24,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:24 BoogieIcfgContainer [2020-08-22 23:01:24,605 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 23:01:24,609 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 23:01:24,611 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 23:01:24,614 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 23:01:24,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 11:01:23" (1/3) ... [2020-08-22 23:01:24,615 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ef93efb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:24, skipping insertion in model container [2020-08-22 23:01:24,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 11:01:23" (2/3) ... [2020-08-22 23:01:24,616 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ef93efb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 11:01:24, skipping insertion in model container [2020-08-22 23:01:24,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 11:01:24" (3/3) ... [2020-08-22 23:01:24,618 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-08-22 23:01:24,630 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 23:01:24,639 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 23:01:24,653 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 23:01:24,675 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 23:01:24,675 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 23:01:24,675 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 23:01:24,676 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 23:01:24,676 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 23:01:24,676 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 23:01:24,676 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 23:01:24,676 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 23:01:24,692 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states. [2020-08-22 23:01:24,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 23:01:24,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:24,704 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:24,704 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:24,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:24,710 INFO L82 PathProgramCache]: Analyzing trace with hash -768807104, now seen corresponding path program 1 times [2020-08-22 23:01:24,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:24,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1103244008] [2020-08-22 23:01:24,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:24,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:24,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:24,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:24,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:24,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1103244008] [2020-08-22 23:01:24,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:24,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 23:01:24,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657876612] [2020-08-22 23:01:24,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 23:01:24,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:24,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 23:01:24,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:01:24,976 INFO L87 Difference]: Start difference. First operand 105 states. Second operand 3 states. [2020-08-22 23:01:25,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:25,265 INFO L93 Difference]: Finished difference Result 188 states and 215 transitions. [2020-08-22 23:01:25,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 23:01:25,267 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 37 [2020-08-22 23:01:25,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:25,278 INFO L225 Difference]: With dead ends: 188 [2020-08-22 23:01:25,278 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 23:01:25,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 23:01:25,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 23:01:25,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2020-08-22 23:01:25,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-22 23:01:25,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2020-08-22 23:01:25,336 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 37 [2020-08-22 23:01:25,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:25,337 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2020-08-22 23:01:25,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 23:01:25,337 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2020-08-22 23:01:25,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 23:01:25,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:25,339 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:25,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 23:01:25,340 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:25,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:25,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1309055982, now seen corresponding path program 1 times [2020-08-22 23:01:25,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:25,342 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1123529379] [2020-08-22 23:01:25,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:25,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:25,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,458 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 23:01:25,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1123529379] [2020-08-22 23:01:25,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 23:01:25,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 23:01:25,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881076671] [2020-08-22 23:01:25,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 23:01:25,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:25,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 23:01:25,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 23:01:25,466 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 4 states. [2020-08-22 23:01:25,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:25,659 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2020-08-22 23:01:25,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 23:01:25,660 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 41 [2020-08-22 23:01:25,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:25,662 INFO L225 Difference]: With dead ends: 144 [2020-08-22 23:01:25,662 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 23:01:25,664 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 [2020-08-22 23:01:25,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 23:01:25,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 79. [2020-08-22 23:01:25,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-22 23:01:25,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 84 transitions. [2020-08-22 23:01:25,677 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 84 transitions. Word has length 41 [2020-08-22 23:01:25,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:25,677 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 84 transitions. [2020-08-22 23:01:25,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 23:01:25,678 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 84 transitions. [2020-08-22 23:01:25,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 23:01:25,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:25,680 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:25,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 23:01:25,680 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:25,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:25,681 INFO L82 PathProgramCache]: Analyzing trace with hash 512896601, now seen corresponding path program 1 times [2020-08-22 23:01:25,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:25,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364402107] [2020-08-22 23:01:25,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:25,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:25,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:25,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 23:01:25,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364402107] [2020-08-22 23:01:25,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:25,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 23:01:25,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477827829] [2020-08-22 23:01:25,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:01:25,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:25,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:01:25,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:25,808 INFO L87 Difference]: Start difference. First operand 79 states and 84 transitions. Second operand 6 states. [2020-08-22 23:01:26,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:26,038 INFO L93 Difference]: Finished difference Result 152 states and 162 transitions. [2020-08-22 23:01:26,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 23:01:26,039 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 55 [2020-08-22 23:01:26,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:26,040 INFO L225 Difference]: With dead ends: 152 [2020-08-22 23:01:26,041 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 23:01:26,042 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:26,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 23:01:26,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-08-22 23:01:26,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 23:01:26,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 91 transitions. [2020-08-22 23:01:26,053 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 91 transitions. Word has length 55 [2020-08-22 23:01:26,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:26,054 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 91 transitions. [2020-08-22 23:01:26,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:01:26,054 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 91 transitions. [2020-08-22 23:01:26,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-22 23:01:26,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:26,056 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:26,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 23:01:26,057 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:26,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:26,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1958895614, now seen corresponding path program 2 times [2020-08-22 23:01:26,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:26,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1894848564] [2020-08-22 23:01:26,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:26,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:26,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,201 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:26,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1894848564] [2020-08-22 23:01:26,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:26,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 23:01:26,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346110129] [2020-08-22 23:01:26,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 23:01:26,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:26,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 23:01:26,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 23:01:26,205 INFO L87 Difference]: Start difference. First operand 86 states and 91 transitions. Second operand 6 states. [2020-08-22 23:01:26,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:26,384 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2020-08-22 23:01:26,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 23:01:26,384 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 62 [2020-08-22 23:01:26,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:26,386 INFO L225 Difference]: With dead ends: 142 [2020-08-22 23:01:26,386 INFO L226 Difference]: Without dead ends: 98 [2020-08-22 23:01:26,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:26,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-22 23:01:26,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 93. [2020-08-22 23:01:26,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 23:01:26,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 98 transitions. [2020-08-22 23:01:26,398 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 98 transitions. Word has length 62 [2020-08-22 23:01:26,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:26,399 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 98 transitions. [2020-08-22 23:01:26,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 23:01:26,399 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 98 transitions. [2020-08-22 23:01:26,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 23:01:26,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:26,401 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:26,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 23:01:26,401 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:26,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:26,402 INFO L82 PathProgramCache]: Analyzing trace with hash 11176526, now seen corresponding path program 3 times [2020-08-22 23:01:26,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:26,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725261189] [2020-08-22 23:01:26,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:26,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:26,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,501 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:26,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725261189] [2020-08-22 23:01:26,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:26,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 23:01:26,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911206352] [2020-08-22 23:01:26,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:26,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:26,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:26,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:26,505 INFO L87 Difference]: Start difference. First operand 93 states and 98 transitions. Second operand 8 states. [2020-08-22 23:01:26,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:26,742 INFO L93 Difference]: Finished difference Result 168 states and 178 transitions. [2020-08-22 23:01:26,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 23:01:26,743 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 69 [2020-08-22 23:01:26,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:26,744 INFO L225 Difference]: With dead ends: 168 [2020-08-22 23:01:26,744 INFO L226 Difference]: Without dead ends: 105 [2020-08-22 23:01:26,745 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:26,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-08-22 23:01:26,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2020-08-22 23:01:26,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 23:01:26,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 105 transitions. [2020-08-22 23:01:26,756 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 105 transitions. Word has length 69 [2020-08-22 23:01:26,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:26,757 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 105 transitions. [2020-08-22 23:01:26,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:26,757 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 105 transitions. [2020-08-22 23:01:26,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-22 23:01:26,758 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:26,759 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:26,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 23:01:26,759 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:26,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:26,760 INFO L82 PathProgramCache]: Analyzing trace with hash -1399032013, now seen corresponding path program 4 times [2020-08-22 23:01:26,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:26,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1644916291] [2020-08-22 23:01:26,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:26,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:26,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:26,877 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:26,877 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1644916291] [2020-08-22 23:01:26,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:26,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:26,878 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319825078] [2020-08-22 23:01:26,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:26,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:26,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:26,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:26,880 INFO L87 Difference]: Start difference. First operand 100 states and 105 transitions. Second operand 10 states. [2020-08-22 23:01:27,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:27,133 INFO L93 Difference]: Finished difference Result 175 states and 185 transitions. [2020-08-22 23:01:27,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:27,133 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 76 [2020-08-22 23:01:27,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:27,135 INFO L225 Difference]: With dead ends: 175 [2020-08-22 23:01:27,135 INFO L226 Difference]: Without dead ends: 112 [2020-08-22 23:01:27,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-22 23:01:27,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 107. [2020-08-22 23:01:27,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-22 23:01:27,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 112 transitions. [2020-08-22 23:01:27,158 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 112 transitions. Word has length 76 [2020-08-22 23:01:27,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:27,158 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 112 transitions. [2020-08-22 23:01:27,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:27,158 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 112 transitions. [2020-08-22 23:01:27,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 23:01:27,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:27,160 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:27,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 23:01:27,161 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:27,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:27,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1633037998, now seen corresponding path program 5 times [2020-08-22 23:01:27,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:27,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1737289705] [2020-08-22 23:01:27,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:27,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:27,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,303 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 23:01:27,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1737289705] [2020-08-22 23:01:27,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:27,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:27,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884752005] [2020-08-22 23:01:27,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:27,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:27,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:27,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:27,308 INFO L87 Difference]: Start difference. First operand 107 states and 112 transitions. Second operand 12 states. [2020-08-22 23:01:27,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:27,626 INFO L93 Difference]: Finished difference Result 177 states and 187 transitions. [2020-08-22 23:01:27,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:27,627 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 83 [2020-08-22 23:01:27,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:27,629 INFO L225 Difference]: With dead ends: 177 [2020-08-22 23:01:27,629 INFO L226 Difference]: Without dead ends: 114 [2020-08-22 23:01:27,630 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-08-22 23:01:27,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-22 23:01:27,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 114. [2020-08-22 23:01:27,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-08-22 23:01:27,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 119 transitions. [2020-08-22 23:01:27,641 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 119 transitions. Word has length 83 [2020-08-22 23:01:27,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:27,641 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 119 transitions. [2020-08-22 23:01:27,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:27,641 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 119 transitions. [2020-08-22 23:01:27,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-22 23:01:27,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:27,643 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:27,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 23:01:27,643 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:27,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:27,644 INFO L82 PathProgramCache]: Analyzing trace with hash 2059478739, now seen corresponding path program 6 times [2020-08-22 23:01:27,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:27,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173543361] [2020-08-22 23:01:27,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:27,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:27,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:27,735 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:27,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173543361] [2020-08-22 23:01:27,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:27,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 23:01:27,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579861402] [2020-08-22 23:01:27,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 23:01:27,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:27,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 23:01:27,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 23:01:27,737 INFO L87 Difference]: Start difference. First operand 114 states and 119 transitions. Second operand 8 states. [2020-08-22 23:01:27,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:27,951 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2020-08-22 23:01:27,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 23:01:27,951 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 90 [2020-08-22 23:01:27,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:27,953 INFO L225 Difference]: With dead ends: 170 [2020-08-22 23:01:27,953 INFO L226 Difference]: Without dead ends: 126 [2020-08-22 23:01:27,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:27,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-22 23:01:27,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 121. [2020-08-22 23:01:27,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-22 23:01:27,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2020-08-22 23:01:27,974 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 90 [2020-08-22 23:01:27,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:27,975 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2020-08-22 23:01:27,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 23:01:27,975 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2020-08-22 23:01:27,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-22 23:01:27,979 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:27,979 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:27,979 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 23:01:27,979 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:27,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:27,980 INFO L82 PathProgramCache]: Analyzing trace with hash 2012961241, now seen corresponding path program 7 times [2020-08-22 23:01:27,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:27,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280919873] [2020-08-22 23:01:27,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:28,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,161 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:28,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280919873] [2020-08-22 23:01:28,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:28,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 23:01:28,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764311101] [2020-08-22 23:01:28,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 23:01:28,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:28,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 23:01:28,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-22 23:01:28,172 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 10 states. [2020-08-22 23:01:28,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:28,438 INFO L93 Difference]: Finished difference Result 177 states and 186 transitions. [2020-08-22 23:01:28,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 23:01:28,444 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 97 [2020-08-22 23:01:28,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:28,445 INFO L225 Difference]: With dead ends: 177 [2020-08-22 23:01:28,445 INFO L226 Difference]: Without dead ends: 133 [2020-08-22 23:01:28,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=160, Unknown=0, NotChecked=0, Total=240 [2020-08-22 23:01:28,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-22 23:01:28,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 128. [2020-08-22 23:01:28,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-08-22 23:01:28,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 133 transitions. [2020-08-22 23:01:28,456 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 133 transitions. Word has length 97 [2020-08-22 23:01:28,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:28,457 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 133 transitions. [2020-08-22 23:01:28,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 23:01:28,460 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 133 transitions. [2020-08-22 23:01:28,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-22 23:01:28,462 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:28,462 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:28,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 23:01:28,462 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:28,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:28,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1354290195, now seen corresponding path program 8 times [2020-08-22 23:01:28,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:28,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31289245] [2020-08-22 23:01:28,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 23:01:28,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 23:01:28,615 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 46 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2020-08-22 23:01:28,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31289245] [2020-08-22 23:01:28,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 23:01:28,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 23:01:28,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544065468] [2020-08-22 23:01:28,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 23:01:28,617 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 23:01:28,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 23:01:28,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-08-22 23:01:28,618 INFO L87 Difference]: Start difference. First operand 128 states and 133 transitions. Second operand 12 states. [2020-08-22 23:01:28,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 23:01:28,877 INFO L93 Difference]: Finished difference Result 179 states and 188 transitions. [2020-08-22 23:01:28,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 23:01:28,878 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 104 [2020-08-22 23:01:28,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 23:01:28,879 INFO L225 Difference]: With dead ends: 179 [2020-08-22 23:01:28,879 INFO L226 Difference]: Without dead ends: 135 [2020-08-22 23:01:28,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2020-08-22 23:01:28,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-08-22 23:01:28,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2020-08-22 23:01:28,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2020-08-22 23:01:28,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 140 transitions. [2020-08-22 23:01:28,889 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 140 transitions. Word has length 104 [2020-08-22 23:01:28,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 23:01:28,889 INFO L479 AbstractCegarLoop]: Abstraction has 135 states and 140 transitions. [2020-08-22 23:01:28,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 23:01:28,890 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 140 transitions. [2020-08-22 23:01:28,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-22 23:01:28,891 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 23:01:28,891 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 23:01:28,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 23:01:28,892 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 23:01:28,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 23:01:28,892 INFO L82 PathProgramCache]: Analyzing trace with hash 1908556953, now seen corresponding path program 9 times [2020-08-22 23:01:28,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 23:01:28,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1118435498] [2020-08-22 23:01:28,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 23:01:28,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:28,927 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:28,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 23:01:28,979 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 23:01:29,027 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 23:01:29,027 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 23:01:29,028 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 23:01:29,090 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 11:01:29 BoogieIcfgContainer [2020-08-22 23:01:29,090 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 23:01:29,093 INFO L168 Benchmark]: Toolchain (without parser) took 5477.20 ms. Allocated memory was 139.5 MB in the beginning and 282.6 MB in the end (delta: 143.1 MB). Free memory was 104.4 MB in the beginning and 132.4 MB in the end (delta: -28.1 MB). Peak memory consumption was 115.1 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,093 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,094 INFO L168 Benchmark]: CACSL2BoogieTranslator took 318.45 ms. Allocated memory is still 139.5 MB. Free memory was 104.1 MB in the beginning and 93.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,095 INFO L168 Benchmark]: Boogie Preprocessor took 130.22 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 93.4 MB in the beginning and 180.2 MB in the end (delta: -86.9 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,096 INFO L168 Benchmark]: RCFGBuilder took 539.38 ms. Allocated memory is still 202.9 MB. Free memory was 180.2 MB in the beginning and 155.3 MB in the end (delta: 25.0 MB). Peak memory consumption was 25.0 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,097 INFO L168 Benchmark]: TraceAbstraction took 4481.21 ms. Allocated memory was 202.9 MB in the beginning and 282.6 MB in the end (delta: 79.7 MB). Free memory was 155.3 MB in the beginning and 132.4 MB in the end (delta: 22.9 MB). Peak memory consumption was 102.5 MB. Max. memory is 7.1 GB. [2020-08-22 23:01:29,100 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 318.45 ms. Allocated memory is still 139.5 MB. Free memory was 104.1 MB in the beginning and 93.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 130.22 ms. Allocated memory was 139.5 MB in the beginning and 202.9 MB in the end (delta: 63.4 MB). Free memory was 93.4 MB in the beginning and 180.2 MB in the end (delta: -86.9 MB). Peak memory consumption was 13.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 539.38 ms. Allocated memory is still 202.9 MB. Free memory was 180.2 MB in the beginning and 155.3 MB in the end (delta: 25.0 MB). Peak memory consumption was 25.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4481.21 ms. Allocated memory was 202.9 MB in the beginning and 282.6 MB in the end (delta: 79.7 MB). Free memory was 155.3 MB in the beginning and 132.4 MB in the end (delta: 22.9 MB). Peak memory consumption was 102.5 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]; VAL [string_A={7:0}, string_B={6:0}] [L21] int i, j, nc_A, nc_B, found=0; VAL [found=0, string_A={7:0}, string_B={6:0}] [L24] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L25] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={7:0}, string_B={6:0}] [L24] i++ VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L25] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-2, found=0, i=1, string_A={7:0}, string_B={6:0}] [L24] i++ VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L25] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-3, found=0, i=2, string_A={7:0}, string_B={6:0}] [L24] i++ VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L25] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-4, found=0, i=3, string_A={7:0}, string_B={6:0}] [L24] i++ VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L25] string_A[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={7:0}, string_B={6:0}] [L24] i++ VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L24] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L26] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={7:0}, string_A[5 -1]=0, string_B={6:0}] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) VAL [found=0, i=5, string_A={7:0}, string_A[5 -1]=0, string_B={6:0}] [L28] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L29] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=0, string_A={7:0}, string_B={6:0}] [L28] i++ VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L29] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-7, found=0, i=1, string_A={7:0}, string_B={6:0}] [L28] i++ VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L29] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=8, found=0, i=2, string_A={7:0}, string_B={6:0}] [L28] i++ VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L29] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=-8, found=0, i=3, string_A={7:0}, string_B={6:0}] [L28] i++ VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L29] string_B[i]=__VERIFIER_nondet_char() VAL [__VERIFIER_nondet_char()=0, found=0, i=4, string_A={7:0}, string_B={6:0}] [L28] i++ VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L28] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L30] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={7:0}, string_B={6:0}, string_B[5 -1]=0] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) VAL [found=0, i=5, string_A={7:0}, string_B={6:0}, string_B[5 -1]=0] [L32] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_B={6:0}] [L33] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_A[nc_A]=0, string_B={6:0}] [L33] COND FALSE !(string_A[nc_A]!='\0') VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_A[nc_A]=0, string_B={6:0}] [L36] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L37] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}, string_B[nc_B]=0] [L37] COND FALSE !(string_B[nc_B]!='\0') VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}, string_B[nc_B]=0] [L40] COND FALSE !(!(nc_B >= nc_A)) VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L43] EXPR j=0 VAL [found=0, i=5, j=0, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L43] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L44] COND FALSE !((inc_B-1)<