/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 19:46:30,902 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 19:46:30,905 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 19:46:30,937 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 19:46:30,938 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 19:46:30,947 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 19:46:30,950 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 19:46:30,955 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 19:46:30,958 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 19:46:30,961 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 19:46:30,962 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 19:46:30,963 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 19:46:30,964 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 19:46:30,967 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 19:46:30,970 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 19:46:30,972 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 19:46:30,973 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 19:46:30,975 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 19:46:30,976 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 19:46:30,985 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 19:46:30,988 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 19:46:30,989 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 19:46:30,990 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 19:46:30,991 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 19:46:31,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 19:46:31,028 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 19:46:31,045 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 19:46:31,046 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 19:46:31,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 19:46:31,049 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 19:46:31,049 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 19:46:31,049 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 19:46:31,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 19:46:31,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 19:46:31,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 19:46:31,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 19:46:31,051 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 19:46:31,052 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 19:46:31,052 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 19:46:31,052 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 19:46:31,053 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 19:46:31,053 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 19:46:31,053 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 19:46:31,054 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 19:46:31,054 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:46:31,054 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 19:46:31,054 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 19:46:31,055 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 19:46:31,055 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-08-22 19:46:31,385 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 19:46:31,406 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 19:46:31,409 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 19:46:31,411 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 19:46:31,411 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 19:46:31,412 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 19:46:31,491 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/686e0594c/136dda38a86940099933725d890ce84b/FLAG2bd131324 [2020-08-22 19:46:31,930 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 19:46:31,930 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-22 19:46:31,936 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/686e0594c/136dda38a86940099933725d890ce84b/FLAG2bd131324 [2020-08-22 19:46:32,307 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/686e0594c/136dda38a86940099933725d890ce84b [2020-08-22 19:46:32,319 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 19:46:32,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 19:46:32,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 19:46:32,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 19:46:32,327 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 19:46:32,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d16764e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32, skipping insertion in model container [2020-08-22 19:46:32,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,344 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 19:46:32,365 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 19:46:32,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:46:32,663 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 19:46:32,685 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 19:46:32,705 INFO L208 MainTranslator]: Completed translation [2020-08-22 19:46:32,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32 WrapperNode [2020-08-22 19:46:32,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 19:46:32,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 19:46:32,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 19:46:32,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 19:46:32,724 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,725 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,733 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,733 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,739 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,745 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,747 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... [2020-08-22 19:46:32,853 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 19:46:32,854 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 19:46:32,854 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 19:46:32,854 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 19:46:32,858 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 19:46:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 19:46:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 19:46:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 19:46:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 19:46:32,931 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 19:46:32,931 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 19:46:32,932 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 19:46:32,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 19:46:32,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 19:46:33,105 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 19:46:33,105 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 19:46:33,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:46:33 BoogieIcfgContainer [2020-08-22 19:46:33,109 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 19:46:33,111 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 19:46:33,111 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 19:46:33,114 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 19:46:33,114 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 07:46:32" (1/3) ... [2020-08-22 19:46:33,115 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c6b2b1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:46:33, skipping insertion in model container [2020-08-22 19:46:33,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 07:46:32" (2/3) ... [2020-08-22 19:46:33,116 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c6b2b1a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 07:46:33, skipping insertion in model container [2020-08-22 19:46:33,116 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 07:46:33" (3/3) ... [2020-08-22 19:46:33,118 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-08-22 19:46:33,131 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 19:46:33,138 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 19:46:33,150 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 19:46:33,175 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 19:46:33,175 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 19:46:33,175 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-08-22 19:46:33,175 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 19:46:33,176 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 19:46:33,176 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 19:46:33,176 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 19:46:33,177 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 19:46:33,194 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-22 19:46:33,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 19:46:33,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,205 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,205 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,213 INFO L82 PathProgramCache]: Analyzing trace with hash 493765703, now seen corresponding path program 1 times [2020-08-22 19:46:33,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [620728698] [2020-08-22 19:46:33,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,292 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:33,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:33,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,353 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 19:46:33,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [620728698] [2020-08-22 19:46:33,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:33,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 19:46:33,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344588525] [2020-08-22 19:46:33,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 19:46:33,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:33,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 19:46:33,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 19:46:33,384 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-22 19:46:33,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:33,408 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2020-08-22 19:46:33,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 19:46:33,409 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-08-22 19:46:33,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:33,417 INFO L225 Difference]: With dead ends: 33 [2020-08-22 19:46:33,417 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 19:46:33,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 19:46:33,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 19:46:33,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 19:46:33,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 19:46:33,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 19:46:33,472 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 11 [2020-08-22 19:46:33,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:33,473 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 19:46:33,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 19:46:33,473 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 19:46:33,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 19:46:33,475 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,475 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 19:46:33,476 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,477 INFO L82 PathProgramCache]: Analyzing trace with hash 486377535, now seen corresponding path program 1 times [2020-08-22 19:46:33,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [46443399] [2020-08-22 19:46:33,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,483 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:33,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:33,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,636 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 19:46:33,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [46443399] [2020-08-22 19:46:33,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:33,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 19:46:33,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328953009] [2020-08-22 19:46:33,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 19:46:33,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:33,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 19:46:33,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 19:46:33,639 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 3 states. [2020-08-22 19:46:33,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:33,670 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 19:46:33,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 19:46:33,671 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-08-22 19:46:33,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:33,673 INFO L225 Difference]: With dead ends: 24 [2020-08-22 19:46:33,673 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 19:46:33,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 19:46:33,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 19:46:33,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2020-08-22 19:46:33,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 19:46:33,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 19:46:33,683 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 11 [2020-08-22 19:46:33,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:33,684 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 19:46:33,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 19:46:33,684 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 19:46:33,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 19:46:33,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,685 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 19:46:33,686 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1748013841, now seen corresponding path program 1 times [2020-08-22 19:46:33,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383267783] [2020-08-22 19:46:33,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,720 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:33,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:33,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:33,882 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 19:46:33,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383267783] [2020-08-22 19:46:33,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:33,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 19:46:33,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493814408] [2020-08-22 19:46:33,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 19:46:33,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:33,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 19:46:33,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 19:46:33,886 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-22 19:46:33,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:33,954 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 19:46:33,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 19:46:33,955 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-22 19:46:33,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:33,957 INFO L225 Difference]: With dead ends: 31 [2020-08-22 19:46:33,957 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 19:46:33,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 19:46:33,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 19:46:33,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2020-08-22 19:46:33,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 19:46:33,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 19:46:33,968 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 16 [2020-08-22 19:46:33,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:33,968 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 19:46:33,968 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 19:46:33,969 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 19:46:33,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 19:46:33,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:33,970 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:33,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 19:46:33,970 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:33,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:33,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1960900159, now seen corresponding path program 2 times [2020-08-22 19:46:33,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:33,972 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711845303] [2020-08-22 19:46:33,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:33,986 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,152 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 19:46:34,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711845303] [2020-08-22 19:46:34,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-22 19:46:34,154 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220110461] [2020-08-22 19:46:34,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 19:46:34,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 19:46:34,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 19:46:34,155 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 7 states. [2020-08-22 19:46:34,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:34,211 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 19:46:34,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 19:46:34,212 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 19:46:34,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:34,213 INFO L225 Difference]: With dead ends: 36 [2020-08-22 19:46:34,213 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 19:46:34,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 19:46:34,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 19:46:34,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2020-08-22 19:46:34,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 19:46:34,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 19:46:34,224 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 21 [2020-08-22 19:46:34,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:34,224 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 19:46:34,225 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 19:46:34,225 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 19:46:34,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 19:46:34,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:34,226 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:34,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 19:46:34,227 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:34,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:34,227 INFO L82 PathProgramCache]: Analyzing trace with hash 1793113839, now seen corresponding path program 3 times [2020-08-22 19:46:34,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:34,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460864869] [2020-08-22 19:46:34,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:34,235 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,459 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 19:46:34,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460864869] [2020-08-22 19:46:34,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-08-22 19:46:34,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612671946] [2020-08-22 19:46:34,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 19:46:34,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 19:46:34,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-08-22 19:46:34,464 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 9 states. [2020-08-22 19:46:34,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:34,658 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 19:46:34,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 19:46:34,659 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-22 19:46:34,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:34,660 INFO L225 Difference]: With dead ends: 39 [2020-08-22 19:46:34,660 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 19:46:34,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-08-22 19:46:34,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 19:46:34,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-22 19:46:34,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 19:46:34,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 19:46:34,670 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 26 [2020-08-22 19:46:34,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:34,671 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 19:46:34,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 19:46:34,671 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 19:46:34,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 19:46:34,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:34,672 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:34,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 19:46:34,673 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:34,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:34,673 INFO L82 PathProgramCache]: Analyzing trace with hash -774708161, now seen corresponding path program 4 times [2020-08-22 19:46:34,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:34,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642036119] [2020-08-22 19:46:34,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:34,679 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:34,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:34,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:34,892 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 19:46:34,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642036119] [2020-08-22 19:46:34,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:34,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-22 19:46:34,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823295934] [2020-08-22 19:46:34,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 19:46:34,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:34,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 19:46:34,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-22 19:46:34,896 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 11 states. [2020-08-22 19:46:35,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:35,122 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 19:46:35,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 19:46:35,122 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-08-22 19:46:35,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:35,124 INFO L225 Difference]: With dead ends: 44 [2020-08-22 19:46:35,124 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 19:46:35,125 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2020-08-22 19:46:35,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 19:46:35,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-08-22 19:46:35,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 19:46:35,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 19:46:35,135 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 31 [2020-08-22 19:46:35,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:35,136 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 19:46:35,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 19:46:35,136 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 19:46:35,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 19:46:35,137 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:35,138 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:35,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 19:46:35,138 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:35,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:35,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1644982033, now seen corresponding path program 5 times [2020-08-22 19:46:35,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:35,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657594588] [2020-08-22 19:46:35,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:35,145 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:35,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:35,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 19:46:35,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 19:46:35,380 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 19:46:35,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657594588] [2020-08-22 19:46:35,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 19:46:35,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-08-22 19:46:35,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060184135] [2020-08-22 19:46:35,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 19:46:35,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 19:46:35,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 19:46:35,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-22 19:46:35,384 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 13 states. [2020-08-22 19:46:35,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 19:46:35,738 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 19:46:35,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 19:46:35,740 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-22 19:46:35,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 19:46:35,741 INFO L225 Difference]: With dead ends: 49 [2020-08-22 19:46:35,741 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 19:46:35,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2020-08-22 19:46:35,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 19:46:35,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-08-22 19:46:35,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 19:46:35,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 19:46:35,759 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 36 [2020-08-22 19:46:35,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 19:46:35,763 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 19:46:35,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 19:46:35,763 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 19:46:35,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 19:46:35,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 19:46:35,768 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 19:46:35,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 19:46:35,768 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 19:46:35,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 19:46:35,769 INFO L82 PathProgramCache]: Analyzing trace with hash 330519103, now seen corresponding path program 6 times [2020-08-22 19:46:35,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 19:46:35,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937113185] [2020-08-22 19:46:35,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 19:46:35,776 INFO L288 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-08-22 19:46:35,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:46:35,821 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:46:35,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 19:46:35,853 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 19:46:35,874 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 19:46:35,874 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 19:46:35,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 19:46:35,894 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 07:46:35 BoogieIcfgContainer [2020-08-22 19:46:35,894 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 19:46:35,897 INFO L168 Benchmark]: Toolchain (without parser) took 3575.74 ms. Allocated memory was 137.9 MB in the beginning and 247.5 MB in the end (delta: 109.6 MB). Free memory was 102.3 MB in the beginning and 198.6 MB in the end (delta: -96.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,898 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,899 INFO L168 Benchmark]: CACSL2BoogieTranslator took 383.83 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,900 INFO L168 Benchmark]: Boogie Preprocessor took 146.33 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.8 MB in the beginning and 182.5 MB in the end (delta: -89.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,901 INFO L168 Benchmark]: RCFGBuilder took 255.93 ms. Allocated memory is still 202.9 MB. Free memory was 182.5 MB in the beginning and 170.4 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,902 INFO L168 Benchmark]: TraceAbstraction took 2783.64 ms. Allocated memory was 202.9 MB in the beginning and 247.5 MB in the end (delta: 44.6 MB). Free memory was 169.7 MB in the beginning and 198.6 MB in the end (delta: -29.0 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. [2020-08-22 19:46:35,906 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 137.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 383.83 ms. Allocated memory is still 137.9 MB. Free memory was 102.1 MB in the beginning and 92.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 146.33 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 92.8 MB in the beginning and 182.5 MB in the end (delta: -89.7 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 255.93 ms. Allocated memory is still 202.9 MB. Free memory was 182.5 MB in the beginning and 170.4 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2783.64 ms. Allocated memory was 202.9 MB in the beginning and 247.5 MB in the end (delta: 44.6 MB). Free memory was 169.7 MB in the beginning and 198.6 MB in the end (delta: -29.0 MB). Peak memory consumption was 15.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(y != 64) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.7s, OverallIterations: 8, TraceHistogramMax: 6, AutomataDifference: 1.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 122 SDtfs, 62 SDslu, 454 SDs, 0 SdLazy, 392 SolverSat, 27 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 91 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 16 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...