/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:40:48,878 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:40:48,881 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:40:48,899 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:40:48,900 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:40:48,902 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:40:48,903 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:40:48,912 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:40:48,917 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:40:48,920 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:40:48,922 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:40:48,924 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:40:48,924 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:40:48,927 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:40:48,930 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:40:48,931 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:40:48,933 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:40:48,934 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:40:48,935 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:40:48,940 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:40:48,946 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:40:48,949 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:40:48,952 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:40:48,953 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:40:48,957 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:40:48,962 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:40:48,964 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:40:48,965 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:40:48,966 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:40:48,967 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:40:48,967 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:40:48,968 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:40:48,968 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:40:48,969 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:40:48,969 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:40:48,970 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:40:48,971 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 [2019-11-06 18:40:48,985 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:40:48,986 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:40:48,987 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:40:48,987 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:40:48,987 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:40:48,987 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:40:48,988 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:40:48,989 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:40:48,989 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:40:48,989 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:40:48,989 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:40:48,989 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:40:48,990 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:40:48,990 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:40:48,990 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:40:48,990 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:40:48,990 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:40:48,991 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:40:48,991 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:40:48,991 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:40:48,991 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:40:48,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:40:48,991 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:40:48,992 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:40:49,269 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:40:49,289 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:40:49,293 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:40:49,294 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:40:49,294 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:40:49,295 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy1_ground-2.i [2019-11-06 18:40:49,374 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05da62b76/f7042961f5284b909708ffc2abf083f1/FLAGb6ca0cede [2019-11-06 18:40:49,832 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:40:49,835 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy1_ground-2.i [2019-11-06 18:40:49,841 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05da62b76/f7042961f5284b909708ffc2abf083f1/FLAGb6ca0cede [2019-11-06 18:40:50,176 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/05da62b76/f7042961f5284b909708ffc2abf083f1 [2019-11-06 18:40:50,189 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:40:50,191 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:40:50,192 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:40:50,192 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:40:50,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:40:50,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,201 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78bcaca8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50, skipping insertion in model container [2019-11-06 18:40:50,201 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,210 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:40:50,230 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:40:50,467 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:40:50,471 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:40:50,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:40:50,523 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:40:50,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50 WrapperNode [2019-11-06 18:40:50,524 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:40:50,524 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:40:50,524 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:40:50,525 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:40:50,621 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,622 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,632 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,634 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,656 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,663 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,666 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (1/1) ... [2019-11-06 18:40:50,668 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:40:50,671 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:40:50,671 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:40:50,671 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:40:50,672 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (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 [2019-11-06 18:40:50,734 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:40:50,734 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:40:50,734 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:40:50,734 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:40:50,734 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:40:50,734 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:40:50,735 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:40:50,736 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:40:51,029 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:40:51,029 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:40:51,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:40:51 BoogieIcfgContainer [2019-11-06 18:40:51,031 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:40:51,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:40:51,032 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:40:51,035 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:40:51,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:40:50" (1/3) ... [2019-11-06 18:40:51,036 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c14de0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:40:51, skipping insertion in model container [2019-11-06 18:40:51,036 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:40:50" (2/3) ... [2019-11-06 18:40:51,037 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38c14de0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:40:51, skipping insertion in model container [2019-11-06 18:40:51,037 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:40:51" (3/3) ... [2019-11-06 18:40:51,039 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy1_ground-2.i [2019-11-06 18:40:51,048 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:40:51,056 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:40:51,067 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:40:51,090 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:40:51,090 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:40:51,090 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:40:51,090 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:40:51,091 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:40:51,091 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:40:51,091 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:40:51,091 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:40:51,108 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:40:51,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:40:51,113 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:51,114 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:51,116 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:51,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:51,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1778002988, now seen corresponding path program 1 times [2019-11-06 18:40:51,130 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:51,130 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451090340] [2019-11-06 18:40:51,130 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:51,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,300 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:40:51,300 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451090340] [2019-11-06 18:40:51,302 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:51,302 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:40:51,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24890897] [2019-11-06 18:40:51,308 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:40:51,308 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:51,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:40:51,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:40:51,325 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:40:51,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:51,446 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2019-11-06 18:40:51,447 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:40:51,448 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:40:51,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:51,458 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:40:51,458 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:40:51,466 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:40:51,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:40:51,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:40:51,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:40:51,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-11-06 18:40:51,510 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-11-06 18:40:51,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:51,510 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-11-06 18:40:51,511 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:40:51,511 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-11-06 18:40:51,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:40:51,512 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:51,512 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:51,512 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:51,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:51,513 INFO L82 PathProgramCache]: Analyzing trace with hash -262172122, now seen corresponding path program 1 times [2019-11-06 18:40:51,513 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:51,514 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058257970] [2019-11-06 18:40:51,514 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:51,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:40:51,599 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058257970] [2019-11-06 18:40:51,600 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:51,600 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:40:51,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652735455] [2019-11-06 18:40:51,602 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:40:51,602 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:51,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:40:51,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:51,603 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2019-11-06 18:40:51,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:51,694 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-11-06 18:40:51,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:40:51,695 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:40:51,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:51,696 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:40:51,696 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:40:51,697 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:51,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:40:51,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-06 18:40:51,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:40:51,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-11-06 18:40:51,704 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-11-06 18:40:51,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:51,705 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-11-06 18:40:51,705 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:40:51,705 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-11-06 18:40:51,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:40:51,706 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:51,706 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:51,707 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:51,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:51,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1578997828, now seen corresponding path program 1 times [2019-11-06 18:40:51,707 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:51,708 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406683175] [2019-11-06 18:40:51,708 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:51,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:40:51,783 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406683175] [2019-11-06 18:40:51,783 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:40:51,783 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:40:51,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262572095] [2019-11-06 18:40:51,784 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:40:51,784 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:51,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:40:51,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:51,785 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 4 states. [2019-11-06 18:40:51,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:51,844 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2019-11-06 18:40:51,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:40:51,845 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-11-06 18:40:51,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:51,846 INFO L225 Difference]: With dead ends: 36 [2019-11-06 18:40:51,846 INFO L226 Difference]: Without dead ends: 25 [2019-11-06 18:40:51,847 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:40:51,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-06 18:40:51,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-11-06 18:40:51,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:40:51,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-06 18:40:51,853 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-06 18:40:51,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:51,853 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-06 18:40:51,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:40:51,854 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-06 18:40:51,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:40:51,855 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:51,855 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:51,855 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:51,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:51,855 INFO L82 PathProgramCache]: Analyzing trace with hash 1323409058, now seen corresponding path program 1 times [2019-11-06 18:40:51,856 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:51,856 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114310382] [2019-11-06 18:40:51,856 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:51,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:51,944 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:40:51,945 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114310382] [2019-11-06 18:40:51,945 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041421089] [2019-11-06 18:40:51,945 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:52,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:52,009 INFO L256 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:40:52,018 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:52,063 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:40:52,063 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:52,064 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-11-06 18:40:52,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531507682] [2019-11-06 18:40:52,064 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:40:52,067 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:52,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:40:52,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:52,068 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-11-06 18:40:52,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:52,174 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2019-11-06 18:40:52,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:40:52,174 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-11-06 18:40:52,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:52,175 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:40:52,176 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:40:52,176 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:52,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:40:52,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-11-06 18:40:52,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:40:52,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-06 18:40:52,182 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 19 [2019-11-06 18:40:52,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:52,183 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-06 18:40:52,183 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:40:52,183 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-06 18:40:52,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:40:52,184 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:52,184 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:52,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:52,388 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:52,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:52,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1582955806, now seen corresponding path program 2 times [2019-11-06 18:40:52,389 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:52,390 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033394382] [2019-11-06 18:40:52,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:52,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:52,505 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:40:52,505 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033394382] [2019-11-06 18:40:52,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1631542774] [2019-11-06 18:40:52,507 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:52,560 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:52,560 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:52,561 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:40:52,563 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:52,579 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:40:52,584 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:52,584 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:40:52,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876845696] [2019-11-06 18:40:52,585 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:40:52,585 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:52,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:40:52,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:52,586 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 7 states. [2019-11-06 18:40:52,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:52,661 INFO L93 Difference]: Finished difference Result 48 states and 52 transitions. [2019-11-06 18:40:52,662 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:40:52,662 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 18:40:52,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:52,663 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:40:52,663 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:40:52,664 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:40:52,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:40:52,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-11-06 18:40:52,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 18:40:52,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-11-06 18:40:52,673 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-11-06 18:40:52,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:52,675 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-11-06 18:40:52,675 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:40:52,676 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-11-06 18:40:52,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:40:52,676 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:52,677 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:52,886 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:52,886 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:52,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:52,887 INFO L82 PathProgramCache]: Analyzing trace with hash 683083068, now seen corresponding path program 3 times [2019-11-06 18:40:52,887 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:52,888 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922569153] [2019-11-06 18:40:52,888 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:52,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:52,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:53,003 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:40:53,007 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922569153] [2019-11-06 18:40:53,007 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795302549] [2019-11-06 18:40:53,007 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:53,059 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:40:53,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:53,061 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:40:53,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:53,099 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:40:53,099 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:53,100 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2019-11-06 18:40:53,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739621575] [2019-11-06 18:40:53,102 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:40:53,102 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:53,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:40:53,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:40:53,102 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 10 states. [2019-11-06 18:40:53,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:53,242 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-11-06 18:40:53,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:40:53,242 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2019-11-06 18:40:53,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:53,243 INFO L225 Difference]: With dead ends: 53 [2019-11-06 18:40:53,243 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 18:40:53,245 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:40:53,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 18:40:53,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-11-06 18:40:53,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:40:53,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-11-06 18:40:53,254 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 25 [2019-11-06 18:40:53,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:53,254 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-11-06 18:40:53,254 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:40:53,254 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-11-06 18:40:53,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 18:40:53,257 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:53,257 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:53,458 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:53,458 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:53,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:53,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1626114376, now seen corresponding path program 4 times [2019-11-06 18:40:53,459 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:53,459 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103513908] [2019-11-06 18:40:53,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:53,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:53,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:53,579 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:40:53,579 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103513908] [2019-11-06 18:40:53,579 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166620377] [2019-11-06 18:40:53,579 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:53,629 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:53,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:53,630 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:40:53,632 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:53,650 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:40:53,650 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:53,651 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:40:53,651 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1115941508] [2019-11-06 18:40:53,651 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:40:53,652 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:53,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:40:53,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:53,652 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 9 states. [2019-11-06 18:40:53,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:53,745 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2019-11-06 18:40:53,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:40:53,746 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-11-06 18:40:53,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:53,746 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:40:53,747 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:40:53,747 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:40:53,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:40:53,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-11-06 18:40:53,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:40:53,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-06 18:40:53,756 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2019-11-06 18:40:53,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:53,756 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-06 18:40:53,756 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:40:53,757 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-06 18:40:53,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:40:53,757 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:53,758 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:53,961 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:53,961 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:53,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:53,962 INFO L82 PathProgramCache]: Analyzing trace with hash -729452458, now seen corresponding path program 5 times [2019-11-06 18:40:53,963 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:53,963 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821973331] [2019-11-06 18:40:53,963 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:53,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:54,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:54,064 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:40:54,065 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821973331] [2019-11-06 18:40:54,065 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555193743] [2019-11-06 18:40:54,066 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:54,157 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 18:40:54,157 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:54,159 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:40:54,161 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:54,297 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:54,297 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:54,297 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2019-11-06 18:40:54,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151893078] [2019-11-06 18:40:54,298 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:40:54,298 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:54,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:40:54,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:54,299 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 13 states. [2019-11-06 18:40:54,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:54,455 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2019-11-06 18:40:54,456 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:40:54,456 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2019-11-06 18:40:54,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:54,457 INFO L225 Difference]: With dead ends: 61 [2019-11-06 18:40:54,457 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 18:40:54,458 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:54,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 18:40:54,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-06 18:40:54,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:40:54,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-11-06 18:40:54,469 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 31 [2019-11-06 18:40:54,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:54,472 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-11-06 18:40:54,472 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:40:54,472 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-11-06 18:40:54,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:40:54,476 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:54,476 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:54,676 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:54,677 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:54,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:54,678 INFO L82 PathProgramCache]: Analyzing trace with hash -1657555758, now seen corresponding path program 6 times [2019-11-06 18:40:54,678 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:54,679 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020622023] [2019-11-06 18:40:54,679 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:54,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:54,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:54,790 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:40:54,790 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020622023] [2019-11-06 18:40:54,790 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205187678] [2019-11-06 18:40:54,791 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:54,884 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:40:54,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:54,885 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:40:54,887 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:54,954 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:54,954 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:54,954 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2019-11-06 18:40:54,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256829878] [2019-11-06 18:40:54,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:40:54,956 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:54,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:40:54,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:54,958 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 15 states. [2019-11-06 18:40:55,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:55,081 INFO L93 Difference]: Finished difference Result 67 states and 72 transitions. [2019-11-06 18:40:55,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:40:55,082 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2019-11-06 18:40:55,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:55,083 INFO L225 Difference]: With dead ends: 67 [2019-11-06 18:40:55,083 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:40:55,084 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:55,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:40:55,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 44. [2019-11-06 18:40:55,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:40:55,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-11-06 18:40:55,090 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 35 [2019-11-06 18:40:55,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:55,090 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-11-06 18:40:55,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:40:55,090 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-11-06 18:40:55,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:40:55,092 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:55,092 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:55,295 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:55,295 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:55,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:55,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1736985422, now seen corresponding path program 7 times [2019-11-06 18:40:55,296 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:55,296 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290064405] [2019-11-06 18:40:55,296 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:55,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:55,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:55,402 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:55,402 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290064405] [2019-11-06 18:40:55,402 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198201059] [2019-11-06 18:40:55,403 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:55,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:55,454 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:40:55,456 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:55,472 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:55,472 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:55,473 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:40:55,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398286783] [2019-11-06 18:40:55,473 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:40:55,474 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:55,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:40:55,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:55,479 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 12 states. [2019-11-06 18:40:55,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:55,573 INFO L93 Difference]: Finished difference Result 70 states and 74 transitions. [2019-11-06 18:40:55,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:40:55,573 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2019-11-06 18:40:55,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:55,574 INFO L225 Difference]: With dead ends: 70 [2019-11-06 18:40:55,574 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 18:40:55,575 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:40:55,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 18:40:55,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-11-06 18:40:55,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:40:55,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2019-11-06 18:40:55,581 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2019-11-06 18:40:55,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:55,582 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2019-11-06 18:40:55,582 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:40:55,582 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2019-11-06 18:40:55,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-06 18:40:55,583 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:55,583 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:55,794 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:55,794 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:55,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:55,795 INFO L82 PathProgramCache]: Analyzing trace with hash -1698867348, now seen corresponding path program 8 times [2019-11-06 18:40:55,795 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:55,796 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613348979] [2019-11-06 18:40:55,796 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:55,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:55,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:55,927 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:55,927 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613348979] [2019-11-06 18:40:55,928 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188306153] [2019-11-06 18:40:55,928 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:55,983 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:40:55,984 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:55,985 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:40:55,987 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:56,007 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:56,008 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:56,008 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:40:56,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659991430] [2019-11-06 18:40:56,009 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:40:56,009 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:56,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:40:56,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:56,010 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 13 states. [2019-11-06 18:40:56,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:56,136 INFO L93 Difference]: Finished difference Result 72 states and 76 transitions. [2019-11-06 18:40:56,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:40:56,136 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2019-11-06 18:40:56,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:56,137 INFO L225 Difference]: With dead ends: 72 [2019-11-06 18:40:56,138 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:40:56,138 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:40:56,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:40:56,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2019-11-06 18:40:56,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:40:56,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-11-06 18:40:56,144 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2019-11-06 18:40:56,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:56,145 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-11-06 18:40:56,145 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:40:56,145 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-11-06 18:40:56,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:40:56,146 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:56,146 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:56,356 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:56,357 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:56,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:56,357 INFO L82 PathProgramCache]: Analyzing trace with hash -723528694, now seen corresponding path program 9 times [2019-11-06 18:40:56,357 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:56,358 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575310626] [2019-11-06 18:40:56,358 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:56,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:56,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:56,469 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:40:56,470 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575310626] [2019-11-06 18:40:56,470 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749063716] [2019-11-06 18:40:56,470 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:56,541 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:40:56,542 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:56,542 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:40:56,545 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:56,621 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:40:56,622 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:56,622 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2019-11-06 18:40:56,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745920587] [2019-11-06 18:40:56,622 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:40:56,623 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:56,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:40:56,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:40:56,624 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 19 states. [2019-11-06 18:40:56,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:56,773 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2019-11-06 18:40:56,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:40:56,773 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2019-11-06 18:40:56,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:56,774 INFO L225 Difference]: With dead ends: 77 [2019-11-06 18:40:56,774 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:40:56,775 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=95, Invalid=247, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:40:56,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:40:56,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-11-06 18:40:56,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:40:56,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-06 18:40:56,781 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 43 [2019-11-06 18:40:56,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:56,781 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-06 18:40:56,781 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:40:56,781 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-06 18:40:56,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:40:56,782 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:56,782 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:56,987 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:56,988 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:56,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:56,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1396375174, now seen corresponding path program 10 times [2019-11-06 18:40:56,989 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:56,989 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793890281] [2019-11-06 18:40:56,989 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:57,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:57,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:57,140 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:57,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793890281] [2019-11-06 18:40:57,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526214722] [2019-11-06 18:40:57,141 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:57,218 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:40:57,218 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:57,220 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:40:57,222 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:57,256 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:57,256 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:57,257 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:40:57,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13151965] [2019-11-06 18:40:57,258 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:40:57,258 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:57,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:40:57,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:57,260 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 15 states. [2019-11-06 18:40:57,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:57,375 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2019-11-06 18:40:57,375 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:40:57,376 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2019-11-06 18:40:57,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:57,376 INFO L225 Difference]: With dead ends: 80 [2019-11-06 18:40:57,377 INFO L226 Difference]: Without dead ends: 55 [2019-11-06 18:40:57,377 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:40:57,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-06 18:40:57,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2019-11-06 18:40:57,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-06 18:40:57,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2019-11-06 18:40:57,388 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 47 [2019-11-06 18:40:57,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:57,392 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2019-11-06 18:40:57,392 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:40:57,392 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2019-11-06 18:40:57,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-06 18:40:57,393 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:57,394 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:57,597 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:57,597 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:57,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:57,598 INFO L82 PathProgramCache]: Analyzing trace with hash 380177572, now seen corresponding path program 11 times [2019-11-06 18:40:57,598 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:57,598 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24180611] [2019-11-06 18:40:57,598 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:57,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:57,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:57,775 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:40:57,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24180611] [2019-11-06 18:40:57,776 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670345400] [2019-11-06 18:40:57,776 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:58,245 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 18:40:58,246 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:40:58,247 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:40:58,250 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:40:58,355 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-06 18:40:58,355 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:40:58,355 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9] total 22 [2019-11-06 18:40:58,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183123232] [2019-11-06 18:40:58,356 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:40:58,356 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:40:58,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:40:58,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=334, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:40:58,357 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 22 states. [2019-11-06 18:40:58,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:40:58,533 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2019-11-06 18:40:58,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:40:58,534 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2019-11-06 18:40:58,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:40:58,534 INFO L225 Difference]: With dead ends: 85 [2019-11-06 18:40:58,535 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 18:40:58,535 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=128, Invalid=334, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:40:58,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 18:40:58,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-11-06 18:40:58,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 18:40:58,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-11-06 18:40:58,542 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 49 [2019-11-06 18:40:58,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:40:58,542 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-11-06 18:40:58,542 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:40:58,542 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-11-06 18:40:58,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 18:40:58,543 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:40:58,543 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:40:58,753 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:40:58,754 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:40:58,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:40:58,754 INFO L82 PathProgramCache]: Analyzing trace with hash 901728800, now seen corresponding path program 12 times [2019-11-06 18:40:58,755 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:40:58,755 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161614258] [2019-11-06 18:40:58,755 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:40:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:58,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:40:58,913 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-11-06 18:40:58,913 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161614258] [2019-11-06 18:40:58,913 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094562338] [2019-11-06 18:40:58,913 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:00,261 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:41:00,261 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:41:00,265 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:41:00,267 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:00,383 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-11-06 18:41:00,383 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:00,383 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 10] total 24 [2019-11-06 18:41:00,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027601556] [2019-11-06 18:41:00,384 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:41:00,384 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:00,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:41:00,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=401, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:41:00,385 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 24 states. [2019-11-06 18:41:00,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:00,505 INFO L93 Difference]: Finished difference Result 91 states and 96 transitions. [2019-11-06 18:41:00,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:41:00,506 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2019-11-06 18:41:00,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:00,506 INFO L225 Difference]: With dead ends: 91 [2019-11-06 18:41:00,506 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:41:00,507 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=401, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:41:00,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:41:00,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-11-06 18:41:00,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-11-06 18:41:00,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-11-06 18:41:00,512 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 53 [2019-11-06 18:41:00,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:00,512 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-11-06 18:41:00,513 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:41:00,513 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-11-06 18:41:00,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-06 18:41:00,513 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:00,513 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:00,718 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:00,719 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:00,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:00,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1482906012, now seen corresponding path program 13 times [2019-11-06 18:41:00,719 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:00,719 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097822429] [2019-11-06 18:41:00,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:00,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:00,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:00,872 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:41:00,872 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097822429] [2019-11-06 18:41:00,872 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74112268] [2019-11-06 18:41:00,873 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:00,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:00,933 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:41:00,934 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:00,973 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:41:00,973 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:00,974 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:41:00,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004339745] [2019-11-06 18:41:00,974 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:41:00,974 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:00,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:41:00,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:41:00,975 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 18 states. [2019-11-06 18:41:01,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:01,115 INFO L93 Difference]: Finished difference Result 94 states and 98 transitions. [2019-11-06 18:41:01,115 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:41:01,116 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 57 [2019-11-06 18:41:01,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:01,116 INFO L225 Difference]: With dead ends: 94 [2019-11-06 18:41:01,117 INFO L226 Difference]: Without dead ends: 65 [2019-11-06 18:41:01,117 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:41:01,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-11-06 18:41:01,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-11-06 18:41:01,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-06 18:41:01,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-11-06 18:41:01,122 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2019-11-06 18:41:01,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:01,123 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-11-06 18:41:01,123 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:41:01,123 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-11-06 18:41:01,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:41:01,124 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:01,124 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:01,333 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:01,333 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:01,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:01,334 INFO L82 PathProgramCache]: Analyzing trace with hash 518314554, now seen corresponding path program 14 times [2019-11-06 18:41:01,334 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:01,334 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674563681] [2019-11-06 18:41:01,334 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:01,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:01,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:41:01,540 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674563681] [2019-11-06 18:41:01,540 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707888324] [2019-11-06 18:41:01,540 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:01,601 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:41:01,601 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:41:01,602 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:41:01,604 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:01,630 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:41:01,630 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:01,630 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:41:01,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104201370] [2019-11-06 18:41:01,631 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:41:01,631 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:01,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:41:01,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:41:01,632 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 19 states. [2019-11-06 18:41:01,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:01,729 INFO L93 Difference]: Finished difference Result 96 states and 100 transitions. [2019-11-06 18:41:01,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:41:01,730 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2019-11-06 18:41:01,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:01,731 INFO L225 Difference]: With dead ends: 96 [2019-11-06 18:41:01,731 INFO L226 Difference]: Without dead ends: 67 [2019-11-06 18:41:01,732 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:41:01,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-06 18:41:01,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2019-11-06 18:41:01,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-06 18:41:01,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-11-06 18:41:01,740 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 59 [2019-11-06 18:41:01,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:01,742 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-11-06 18:41:01,742 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:41:01,742 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-11-06 18:41:01,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-06 18:41:01,744 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:01,744 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:01,948 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:01,948 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:01,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:01,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1258859352, now seen corresponding path program 15 times [2019-11-06 18:41:01,949 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:01,949 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81428719] [2019-11-06 18:41:01,949 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:01,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:02,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:02,140 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-11-06 18:41:02,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81428719] [2019-11-06 18:41:02,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177503368] [2019-11-06 18:41:02,140 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:02,462 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:41:02,463 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:41:02,464 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:41:02,465 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:02,615 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-11-06 18:41:02,615 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:02,615 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11] total 28 [2019-11-06 18:41:02,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115561985] [2019-11-06 18:41:02,616 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 18:41:02,616 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:02,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 18:41:02,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=547, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:41:02,617 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 28 states. [2019-11-06 18:41:02,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:02,836 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2019-11-06 18:41:02,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 18:41:02,836 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 61 [2019-11-06 18:41:02,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:02,837 INFO L225 Difference]: With dead ends: 101 [2019-11-06 18:41:02,837 INFO L226 Difference]: Without dead ends: 72 [2019-11-06 18:41:02,837 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=209, Invalid=547, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:41:02,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-11-06 18:41:02,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-11-06 18:41:02,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-06 18:41:02,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2019-11-06 18:41:02,842 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 61 [2019-11-06 18:41:02,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:02,843 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2019-11-06 18:41:02,843 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 18:41:02,843 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2019-11-06 18:41:02,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:41:02,843 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:02,844 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:03,044 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:03,045 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:03,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:03,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1831973164, now seen corresponding path program 16 times [2019-11-06 18:41:03,045 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:03,046 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251578036] [2019-11-06 18:41:03,046 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:03,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:03,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:03,261 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:41:03,261 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251578036] [2019-11-06 18:41:03,262 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678691618] [2019-11-06 18:41:03,262 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:03,327 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:41:03,327 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:41:03,328 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:41:03,329 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:03,346 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:41:03,346 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:03,347 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:41:03,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014706089] [2019-11-06 18:41:03,347 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:41:03,348 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:03,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:41:03,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:41:03,348 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 21 states. [2019-11-06 18:41:03,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:03,470 INFO L93 Difference]: Finished difference Result 104 states and 108 transitions. [2019-11-06 18:41:03,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:41:03,470 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2019-11-06 18:41:03,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:03,471 INFO L225 Difference]: With dead ends: 104 [2019-11-06 18:41:03,472 INFO L226 Difference]: Without dead ends: 73 [2019-11-06 18:41:03,473 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:41:03,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-06 18:41:03,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2019-11-06 18:41:03,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-06 18:41:03,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2019-11-06 18:41:03,477 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 65 [2019-11-06 18:41:03,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:03,478 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2019-11-06 18:41:03,478 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:41:03,478 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2019-11-06 18:41:03,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-06 18:41:03,479 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:03,479 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:03,680 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:03,680 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:03,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:03,681 INFO L82 PathProgramCache]: Analyzing trace with hash 34361714, now seen corresponding path program 17 times [2019-11-06 18:41:03,681 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:03,682 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782411378] [2019-11-06 18:41:03,682 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:03,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:03,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:03,938 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:41:03,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782411378] [2019-11-06 18:41:03,939 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1150520319] [2019-11-06 18:41:03,939 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:11,508 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 18:41:11,508 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:41:11,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:41:11,516 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:41:11,540 INFO L134 CoverageAnalysis]: Checked inductivity of 370 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:41:11,541 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:41:11,544 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:41:11,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166211360] [2019-11-06 18:41:11,544 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:41:11,547 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:41:11,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:41:11,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:41:11,548 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 22 states. [2019-11-06 18:41:11,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:41:11,687 INFO L93 Difference]: Finished difference Result 106 states and 110 transitions. [2019-11-06 18:41:11,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:41:11,688 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 67 [2019-11-06 18:41:11,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:41:11,689 INFO L225 Difference]: With dead ends: 106 [2019-11-06 18:41:11,689 INFO L226 Difference]: Without dead ends: 75 [2019-11-06 18:41:11,689 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:41:11,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-11-06 18:41:11,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-11-06 18:41:11,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-11-06 18:41:11,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2019-11-06 18:41:11,696 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 67 [2019-11-06 18:41:11,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:41:11,696 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2019-11-06 18:41:11,696 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:41:11,696 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2019-11-06 18:41:11,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-06 18:41:11,697 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:41:11,697 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:41:11,905 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:41:11,905 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:41:11,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:41:11,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1714150256, now seen corresponding path program 18 times [2019-11-06 18:41:11,906 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:41:11,906 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233072540] [2019-11-06 18:41:11,907 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:41:11,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:12,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:41:12,160 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:41:12,160 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233072540] [2019-11-06 18:41:12,160 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15550593] [2019-11-06 18:41:12,160 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true