/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:48:48,389 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:48:48,392 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:48:48,413 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:48:48,414 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:48:48,415 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:48:48,417 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:48:48,419 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:48:48,420 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:48:48,421 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:48:48,422 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:48:48,424 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:48:48,424 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:48:48,425 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:48:48,426 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:48:48,427 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:48:48,429 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:48:48,430 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:48:48,432 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:48:48,435 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:48:48,437 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:48:48,439 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:48:48,441 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:48:48,442 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:48:48,445 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:48:48,455 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:48:48,457 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:48:48,458 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:48:48,459 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 11:48:48,476 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:48:48,477 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:48:48,478 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:48:48,479 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:48:48,479 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:48:48,479 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:48:48,479 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:48:48,480 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:48:48,480 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:48:48,480 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:48:48,480 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:48:48,481 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:48:48,481 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:48:48,481 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:48:48,481 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:48:48,481 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:48:48,482 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:48:48,482 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:48:48,482 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:48:48,485 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:48:48,486 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:48:48,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:48:48,486 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:48:48,486 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:48:48,487 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:48:48,852 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:48:48,868 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:48:48,872 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:48:48,874 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:48:48,875 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:48:48,876 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 11:48:48,974 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e64275f8d/e43fa69c7d8d4ae19827b11eeefd4573/FLAG68faf3b53 [2020-07-20 11:48:49,552 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:48:49,553 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 11:48:49,562 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e64275f8d/e43fa69c7d8d4ae19827b11eeefd4573/FLAG68faf3b53 [2020-07-20 11:48:49,924 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e64275f8d/e43fa69c7d8d4ae19827b11eeefd4573 [2020-07-20 11:48:49,937 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:48:49,940 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:48:49,941 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:49,942 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:48:49,946 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:48:49,948 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:49" (1/1) ... [2020-07-20 11:48:49,952 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e2af008 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:49, skipping insertion in model container [2020-07-20 11:48:49,952 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:49" (1/1) ... [2020-07-20 11:48:49,962 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:48:49,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:48:50,212 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:50,219 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:48:50,246 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:50,269 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:48:50,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50 WrapperNode [2020-07-20 11:48:50,270 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:50,271 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:48:50,271 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:48:50,271 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:48:50,284 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,284 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,401 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,401 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,409 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,417 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (1/1) ... [2020-07-20 11:48:50,419 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:48:50,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:48:50,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:48:50,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:48:50,422 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (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 [2020-07-20 11:48:50,510 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:48:50,510 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:48:50,510 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:48:50,510 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:48:50,510 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:48:50,511 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 11:48:50,511 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:48:50,511 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:48:50,511 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:48:50,512 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:48:50,512 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:48:50,512 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:48:50,513 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:48:50,513 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:48:50,761 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:48:50,762 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 11:48:50,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:50 BoogieIcfgContainer [2020-07-20 11:48:50,768 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:48:50,769 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:48:50,769 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:48:50,774 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:48:50,774 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:48:49" (1/3) ... [2020-07-20 11:48:50,775 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cea26fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:50, skipping insertion in model container [2020-07-20 11:48:50,776 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:50" (2/3) ... [2020-07-20 11:48:50,776 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cea26fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:50, skipping insertion in model container [2020-07-20 11:48:50,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:50" (3/3) ... [2020-07-20 11:48:50,779 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-20 11:48:50,793 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:48:50,803 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:48:50,821 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:48:50,848 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:48:50,849 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:48:50,849 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:48:50,849 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:48:50,849 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:48:50,849 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:48:50,849 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:48:50,849 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:48:50,869 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 11:48:50,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:48:50,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:50,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:50,878 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:50,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:50,884 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-20 11:48:50,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:50,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745700609] [2020-07-20 11:48:50,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:50,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:50,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:48:50,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:51,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:51,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:51,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745700609] [2020-07-20 11:48:51,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:51,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:48:51,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614354518] [2020-07-20 11:48:51,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:48:51,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:51,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:48:51,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:51,077 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 11:48:51,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:51,108 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-20 11:48:51,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:48:51,111 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-20 11:48:51,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:51,123 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:48:51,123 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:48:51,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:51,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:48:51,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:48:51,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:48:51,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 11:48:51,182 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-20 11:48:51,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:51,182 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 11:48:51,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:48:51,183 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 11:48:51,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:48:51,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:51,184 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:51,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:51,399 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:51,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:51,400 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-20 11:48:51,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:51,402 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67104596] [2020-07-20 11:48:51,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:51,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:51,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 11:48:51,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:51,491 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:51,492 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:51,492 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67104596] [2020-07-20 11:48:51,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:51,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:48:51,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651570083] [2020-07-20 11:48:51,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:48:51,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:51,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:48:51,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:48:51,497 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-20 11:48:51,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:51,569 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 11:48:51,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:48:51,570 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-20 11:48:51,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:51,574 INFO L225 Difference]: With dead ends: 35 [2020-07-20 11:48:51,574 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 11:48:51,576 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:48:51,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 11:48:51,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-20 11:48:51,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 11:48:51,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 11:48:51,586 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-20 11:48:51,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:51,587 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 11:48:51,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:48:51,587 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 11:48:51,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 11:48:51,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:51,589 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:51,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:51,796 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:51,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:51,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-20 11:48:51,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:51,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1362242193] [2020-07-20 11:48:51,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:51,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:51,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:48:51,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:51,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:51,905 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:51,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:51,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1362242193] [2020-07-20 11:48:51,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:51,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 11:48:51,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013485737] [2020-07-20 11:48:51,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 11:48:51,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:51,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 11:48:51,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:48:52,002 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-20 11:48:52,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:52,149 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-20 11:48:52,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 11:48:52,150 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-20 11:48:52,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:52,152 INFO L225 Difference]: With dead ends: 52 [2020-07-20 11:48:52,153 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 11:48:52,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 11:48:52,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 11:48:52,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-20 11:48:52,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:48:52,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-20 11:48:52,169 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-20 11:48:52,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:52,169 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-20 11:48:52,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 11:48:52,169 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-20 11:48:52,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:48:52,170 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:52,171 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:52,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:52,386 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:52,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:52,388 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-20 11:48:52,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:52,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756159205] [2020-07-20 11:48:52,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:52,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:52,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 11:48:52,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:52,509 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:52,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:52,610 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:52,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756159205] [2020-07-20 11:48:52,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:52,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 11:48:52,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590616228] [2020-07-20 11:48:52,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:48:52,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:52,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:48:52,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:48:52,615 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-20 11:48:52,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:52,894 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-20 11:48:52,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 11:48:52,895 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-20 11:48:52,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:52,897 INFO L225 Difference]: With dead ends: 102 [2020-07-20 11:48:52,897 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 11:48:52,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:48:52,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 11:48:52,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-20 11:48:52,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 11:48:52,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-20 11:48:52,914 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-20 11:48:52,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:52,914 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-20 11:48:52,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:48:52,915 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-20 11:48:52,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 11:48:52,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:52,916 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:53,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:53,130 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:53,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:53,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-20 11:48:53,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:53,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691706625] [2020-07-20 11:48:53,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:53,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:53,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:48:53,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:53,345 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:53,346 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:53,652 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:53,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691706625] [2020-07-20 11:48:53,653 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:53,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 11:48:53,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369101256] [2020-07-20 11:48:53,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 11:48:53,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:53,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 11:48:53,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:48:53,656 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-20 11:48:54,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:54,071 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-20 11:48:54,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 11:48:54,072 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-20 11:48:54,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:54,075 INFO L225 Difference]: With dead ends: 210 [2020-07-20 11:48:54,075 INFO L226 Difference]: Without dead ends: 165 [2020-07-20 11:48:54,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:48:54,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-20 11:48:54,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-20 11:48:54,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 11:48:54,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-20 11:48:54,099 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-20 11:48:54,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:54,099 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-20 11:48:54,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 11:48:54,100 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-20 11:48:54,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 11:48:54,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:54,102 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:54,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:54,317 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:54,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:54,319 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-20 11:48:54,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:54,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [573122924] [2020-07-20 11:48:54,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:54,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:54,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 11:48:54,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:54,797 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:54,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:55,838 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:55,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [573122924] [2020-07-20 11:48:55,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:55,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 11:48:55,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495581993] [2020-07-20 11:48:55,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 11:48:55,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:55,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 11:48:55,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 11:48:55,844 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-20 11:48:56,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:56,740 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-20 11:48:56,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 11:48:56,743 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-20 11:48:56,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:56,746 INFO L225 Difference]: With dead ends: 426 [2020-07-20 11:48:56,746 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 11:48:56,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 11:48:56,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 11:48:56,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-20 11:48:56,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 11:48:56,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-20 11:48:56,780 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-20 11:48:56,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:56,781 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-20 11:48:56,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 11:48:56,781 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-20 11:48:56,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 11:48:56,785 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:56,785 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:56,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:56,992 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:56,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:56,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-20 11:48:56,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:56,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1165848918] [2020-07-20 11:48:56,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:57,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:57,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 11:48:57,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:58,467 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:48:58,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:02,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:49:02,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1165848918] [2020-07-20 11:49:02,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:49:02,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 11:49:02,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401201379] [2020-07-20 11:49:02,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 11:49:02,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:02,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 11:49:02,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 11:49:02,404 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-20 11:49:05,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:05,713 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-20 11:49:05,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 11:49:05,714 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-20 11:49:05,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:05,719 INFO L225 Difference]: With dead ends: 858 [2020-07-20 11:49:05,719 INFO L226 Difference]: Without dead ends: 669 [2020-07-20 11:49:05,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 11:49:05,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-20 11:49:05,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-20 11:49:05,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-20 11:49:05,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-20 11:49:05,759 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-20 11:49:05,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:05,760 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-20 11:49:05,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 11:49:05,761 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-20 11:49:05,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-20 11:49:05,764 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:05,765 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:05,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:05,978 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:05,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:05,979 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-20 11:49:05,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:05,981 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [305299940] [2020-07-20 11:49:05,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:06,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:06,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 618 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-20 11:49:06,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:11,196 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:49:11,197 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:49:26,143 INFO L134 CoverageAnalysis]: Checked inductivity of 8836 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:49:26,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [305299940] [2020-07-20 11:49:26,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:49:26,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97] total 192 [2020-07-20 11:49:26,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041538541] [2020-07-20 11:49:26,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 192 states [2020-07-20 11:49:26,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:26,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 192 interpolants. [2020-07-20 11:49:26,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-20 11:49:26,159 INFO L87 Difference]: Start difference. First operand 576 states and 671 transitions. Second operand 192 states. [2020-07-20 11:49:48,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:48,693 INFO L93 Difference]: Finished difference Result 1722 states and 2199 transitions. [2020-07-20 11:49:48,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2020-07-20 11:49:48,697 INFO L78 Accepts]: Start accepts. Automaton has 192 states. Word has length 202 [2020-07-20 11:49:48,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:48,708 INFO L225 Difference]: With dead ends: 1722 [2020-07-20 11:49:48,708 INFO L226 Difference]: Without dead ends: 1341 [2020-07-20 11:49:48,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 213 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.7s TimeCoverageRelationStatistics Valid=18336, Invalid=18336, Unknown=0, NotChecked=0, Total=36672 [2020-07-20 11:49:48,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1341 states. [2020-07-20 11:49:48,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1341 to 1152. [2020-07-20 11:49:48,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1152 states. [2020-07-20 11:49:48,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1152 states to 1152 states and 1343 transitions. [2020-07-20 11:49:48,756 INFO L78 Accepts]: Start accepts. Automaton has 1152 states and 1343 transitions. Word has length 202 [2020-07-20 11:49:48,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:48,761 INFO L479 AbstractCegarLoop]: Abstraction has 1152 states and 1343 transitions. [2020-07-20 11:49:48,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 192 states. [2020-07-20 11:49:48,761 INFO L276 IsEmpty]: Start isEmpty. Operand 1152 states and 1343 transitions. [2020-07-20 11:49:48,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2020-07-20 11:49:48,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:48,768 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:48,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:48,982 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:48,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:48,983 INFO L82 PathProgramCache]: Analyzing trace with hash -74498967, now seen corresponding path program 7 times [2020-07-20 11:49:48,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:48,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580185018] [2020-07-20 11:49:48,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:49,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:49,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 192 conjunts are in the unsatisfiable core [2020-07-20 11:49:49,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:50:10,787 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:50:10,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:51:24,894 INFO L134 CoverageAnalysis]: Checked inductivity of 36100 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:51:24,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580185018] [2020-07-20 11:51:24,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:51:24,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193] total 384 [2020-07-20 11:51:24,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1700694878] [2020-07-20 11:51:24,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 384 states [2020-07-20 11:51:24,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:51:24,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 384 interpolants. [2020-07-20 11:51:24,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-20 11:51:24,925 INFO L87 Difference]: Start difference. First operand 1152 states and 1343 transitions. Second operand 384 states. [2020-07-20 11:59:06,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:59:06,226 INFO L93 Difference]: Finished difference Result 3450 states and 4407 transitions. [2020-07-20 11:59:06,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2020-07-20 11:59:06,230 INFO L78 Accepts]: Start accepts. Automaton has 384 states. Word has length 394 [2020-07-20 11:59:06,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:59:06,247 INFO L225 Difference]: With dead ends: 3450 [2020-07-20 11:59:06,247 INFO L226 Difference]: Without dead ends: 2685 [2020-07-20 11:59:06,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 787 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 382 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 95.2s TimeCoverageRelationStatistics Valid=73536, Invalid=73536, Unknown=0, NotChecked=0, Total=147072 [2020-07-20 11:59:06,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2685 states. [2020-07-20 11:59:06,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2685 to 2304. [2020-07-20 11:59:06,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2304 states. [2020-07-20 11:59:06,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2304 states to 2304 states and 2687 transitions. [2020-07-20 11:59:06,348 INFO L78 Accepts]: Start accepts. Automaton has 2304 states and 2687 transitions. Word has length 394 [2020-07-20 11:59:06,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:59:06,350 INFO L479 AbstractCegarLoop]: Abstraction has 2304 states and 2687 transitions. [2020-07-20 11:59:06,350 INFO L480 AbstractCegarLoop]: Interpolant automaton has 384 states. [2020-07-20 11:59:06,350 INFO L276 IsEmpty]: Start isEmpty. Operand 2304 states and 2687 transitions. [2020-07-20 11:59:06,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 779 [2020-07-20 11:59:06,374 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:59:06,375 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:59:06,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:06,589 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:59:06,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:59:06,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1435375081, now seen corresponding path program 8 times [2020-07-20 11:59:06,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:59:06,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467196349] [2020-07-20 11:59:06,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:59:07,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:59:07,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 2346 conjuncts, 384 conjunts are in the unsatisfiable core [2020-07-20 11:59:07,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:00:49,689 INFO L134 CoverageAnalysis]: Checked inductivity of 145924 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:00:49,689 INFO L328 TraceCheckSpWp]: Computing backward predicates...