/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:29:07,303 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:29:07,306 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:29:07,360 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-06 22:29:07,454 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:29:07,455 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:29:07,456 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:29:07,457 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:29:07,497 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:29:07,497 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:29:07,498 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:29:07,498 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:29:07,499 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:29:07,499 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:29:07,499 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:29:07,499 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:29:07,499 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:29:07,500 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:29:07,500 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:29:07,500 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:29:07,500 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:29:07,500 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:29:07,501 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:29:07,501 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:29:07,501 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:29:07,501 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:29:07,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:29:07,502 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:29:07,502 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:29:07,502 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:29:07,502 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:29:07,502 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:29:07,503 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:29:07,868 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:29:07,894 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:29:07,897 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:29:07,898 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:29:07,899 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:29:07,900 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-11-06 22:29:07,992 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8471abaae/6ba95ef251344a80b7bd8d5c466e7350/FLAGea2552fd3 [2020-11-06 22:29:08,645 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:29:08,646 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-11-06 22:29:08,653 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8471abaae/6ba95ef251344a80b7bd8d5c466e7350/FLAGea2552fd3 [2020-11-06 22:29:08,994 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8471abaae/6ba95ef251344a80b7bd8d5c466e7350 [2020-11-06 22:29:08,997 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:29:09,009 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:29:09,013 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:29:09,013 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:29:09,017 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:29:09,018 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:29:08" (1/1) ... [2020-11-06 22:29:09,022 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f1e14c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09, skipping insertion in model container [2020-11-06 22:29:09,023 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:29:08" (1/1) ... [2020-11-06 22:29:09,031 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:29:09,050 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:29:09,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:29:09,240 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:29:09,261 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:29:09,277 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:29:09,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09 WrapperNode [2020-11-06 22:29:09,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:29:09,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:29:09,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:29:09,279 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:29:09,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,291 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,298 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,298 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,305 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,310 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,312 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... [2020-11-06 22:29:09,314 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:29:09,315 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:29:09,315 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:29:09,315 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:29:09,316 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:29:09,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:29:09,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:29:09,381 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:29:09,381 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-11-06 22:29:09,381 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:29:09,381 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:29:09,381 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:29:09,381 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:29:09,381 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:29:09,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:29:09,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:29:09,383 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:29:09,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:29:09,868 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:29:09,868 INFO L298 CfgBuilder]: Removed 2 assume(true) statements. [2020-11-06 22:29:09,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:29:09 BoogieIcfgContainer [2020-11-06 22:29:09,870 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:29:09,873 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:29:09,873 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:29:09,876 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:29:09,877 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:29:08" (1/3) ... [2020-11-06 22:29:09,878 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6654e8bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:29:09, skipping insertion in model container [2020-11-06 22:29:09,879 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:29:09" (2/3) ... [2020-11-06 22:29:09,879 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6654e8bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:29:09, skipping insertion in model container [2020-11-06 22:29:09,880 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:29:09" (3/3) ... [2020-11-06 22:29:09,881 INFO L111 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-11-06 22:29:09,898 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:29:09,903 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:29:09,933 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:29:09,975 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:29:09,975 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:29:09,975 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:29:09,975 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:29:09,975 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:29:09,975 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:29:09,976 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:29:09,976 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:29:09,999 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-11-06 22:29:10,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-06 22:29:10,005 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:10,006 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:10,006 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:10,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:10,014 INFO L82 PathProgramCache]: Analyzing trace with hash -748858587, now seen corresponding path program 1 times [2020-11-06 22:29:10,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:10,026 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110057877] [2020-11-06 22:29:10,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:10,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:10,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:29:10,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,394 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:10,394 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110057877] [2020-11-06 22:29:10,395 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:29:10,395 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-06 22:29:10,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878509134] [2020-11-06 22:29:10,401 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-06 22:29:10,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:10,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-06 22:29:10,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:29:10,417 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-11-06 22:29:10,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:10,499 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2020-11-06 22:29:10,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-06 22:29:10,501 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-11-06 22:29:10,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:10,508 INFO L225 Difference]: With dead ends: 47 [2020-11-06 22:29:10,509 INFO L226 Difference]: Without dead ends: 21 [2020-11-06 22:29:10,512 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:29:10,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-11-06 22:29:10,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-11-06 22:29:10,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-11-06 22:29:10,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-11-06 22:29:10,551 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-11-06 22:29:10,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:10,552 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-11-06 22:29:10,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-06 22:29:10,552 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-11-06 22:29:10,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-11-06 22:29:10,553 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:10,553 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:10,553 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:29:10,554 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:10,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:10,554 INFO L82 PathProgramCache]: Analyzing trace with hash -561404142, now seen corresponding path program 1 times [2020-11-06 22:29:10,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:10,559 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086330149] [2020-11-06 22:29:10,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:10,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-11-06 22:29:10,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,655 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:10,656 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086330149] [2020-11-06 22:29:10,656 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:29:10,656 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-11-06 22:29:10,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520180887] [2020-11-06 22:29:10,658 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-06 22:29:10,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:10,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-06 22:29:10,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:29:10,659 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2020-11-06 22:29:10,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:10,719 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-11-06 22:29:10,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-06 22:29:10,719 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2020-11-06 22:29:10,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:10,721 INFO L225 Difference]: With dead ends: 36 [2020-11-06 22:29:10,721 INFO L226 Difference]: Without dead ends: 23 [2020-11-06 22:29:10,722 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-06 22:29:10,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-11-06 22:29:10,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-11-06 22:29:10,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-11-06 22:29:10,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2020-11-06 22:29:10,732 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2020-11-06 22:29:10,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:10,732 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2020-11-06 22:29:10,732 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-06 22:29:10,733 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2020-11-06 22:29:10,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-06 22:29:10,734 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:10,734 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:10,734 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:29:10,735 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:10,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:10,738 INFO L82 PathProgramCache]: Analyzing trace with hash 362883760, now seen corresponding path program 1 times [2020-11-06 22:29:10,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:10,741 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924251474] [2020-11-06 22:29:10,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:10,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:10,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-11-06 22:29:10,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:10,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924251474] [2020-11-06 22:29:10,831 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1642551742] [2020-11-06 22:29:10,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -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 [2020-11-06 22:29:10,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:10,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-06 22:29:10,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:10,975 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:10,976 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:10,976 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-11-06 22:29:10,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585881371] [2020-11-06 22:29:10,977 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:29:10,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:10,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:29:10,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:29:10,979 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 6 states. [2020-11-06 22:29:11,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:11,055 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-11-06 22:29:11,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-06 22:29:11,056 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-11-06 22:29:11,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:11,057 INFO L225 Difference]: With dead ends: 38 [2020-11-06 22:29:11,057 INFO L226 Difference]: Without dead ends: 25 [2020-11-06 22:29:11,058 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:29:11,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-06 22:29:11,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-11-06 22:29:11,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-06 22:29:11,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-11-06 22:29:11,067 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2020-11-06 22:29:11,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:11,068 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-11-06 22:29:11,068 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:29:11,068 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-11-06 22:29:11,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-11-06 22:29:11,069 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:11,069 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:11,282 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:29:11,283 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:11,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:11,285 INFO L82 PathProgramCache]: Analyzing trace with hash -454672690, now seen corresponding path program 2 times [2020-11-06 22:29:11,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:11,286 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573952167] [2020-11-06 22:29:11,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:11,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:11,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:11,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:11,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-11-06 22:29:11,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:11,425 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573952167] [2020-11-06 22:29:11,425 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262635436] [2020-11-06 22:29:11,425 INFO L93 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 [2020-11-06 22:29:11,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:29:11,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:11,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-06 22:29:11,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:11,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:11,580 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:11,580 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-11-06 22:29:11,580 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [862124135] [2020-11-06 22:29:11,581 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-06 22:29:11,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:11,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-06 22:29:11,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:29:11,582 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 7 states. [2020-11-06 22:29:11,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:11,690 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-11-06 22:29:11,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:29:11,690 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-11-06 22:29:11,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:11,691 INFO L225 Difference]: With dead ends: 40 [2020-11-06 22:29:11,691 INFO L226 Difference]: Without dead ends: 27 [2020-11-06 22:29:11,692 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:29:11,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-06 22:29:11,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-11-06 22:29:11,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-06 22:29:11,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-11-06 22:29:11,699 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 23 [2020-11-06 22:29:11,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:11,699 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-11-06 22:29:11,699 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-06 22:29:11,699 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-11-06 22:29:11,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-06 22:29:11,700 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:11,701 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:11,913 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:11,914 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:11,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:11,915 INFO L82 PathProgramCache]: Analyzing trace with hash -147405972, now seen corresponding path program 3 times [2020-11-06 22:29:11,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:11,916 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [811576545] [2020-11-06 22:29:11,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:11,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:12,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-11-06 22:29:12,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,017 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:12,018 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [811576545] [2020-11-06 22:29:12,018 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888318224] [2020-11-06 22:29:12,018 INFO L93 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 [2020-11-06 22:29:12,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-06 22:29:12,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:12,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-06 22:29:12,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:12,115 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:12,115 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:12,115 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-11-06 22:29:12,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602086736] [2020-11-06 22:29:12,116 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-06 22:29:12,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:12,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-06 22:29:12,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:29:12,118 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 8 states. [2020-11-06 22:29:12,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:12,178 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-11-06 22:29:12,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-06 22:29:12,179 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-11-06 22:29:12,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:12,180 INFO L225 Difference]: With dead ends: 42 [2020-11-06 22:29:12,181 INFO L226 Difference]: Without dead ends: 29 [2020-11-06 22:29:12,181 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-11-06 22:29:12,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-06 22:29:12,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-11-06 22:29:12,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-11-06 22:29:12,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2020-11-06 22:29:12,187 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 25 [2020-11-06 22:29:12,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:12,187 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2020-11-06 22:29:12,187 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-06 22:29:12,188 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2020-11-06 22:29:12,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-11-06 22:29:12,189 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:12,189 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:12,399 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:12,400 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:12,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:12,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1216833398, now seen corresponding path program 4 times [2020-11-06 22:29:12,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:12,402 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887359115] [2020-11-06 22:29:12,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:12,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:12,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-11-06 22:29:12,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:12,545 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:12,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887359115] [2020-11-06 22:29:12,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1875044414] [2020-11-06 22:29:12,546 INFO L93 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 [2020-11-06 22:29:12,610 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:29:12,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:12,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:29:12,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:12,638 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:12,638 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:12,639 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-11-06 22:29:12,639 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063482191] [2020-11-06 22:29:12,639 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:29:12,640 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:12,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:29:12,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:29:12,640 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 9 states. [2020-11-06 22:29:12,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:12,713 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-11-06 22:29:12,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:29:12,714 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-11-06 22:29:12,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:12,715 INFO L225 Difference]: With dead ends: 44 [2020-11-06 22:29:12,715 INFO L226 Difference]: Without dead ends: 31 [2020-11-06 22:29:12,715 INFO L677 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 [2020-11-06 22:29:12,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-06 22:29:12,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-11-06 22:29:12,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-11-06 22:29:12,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-11-06 22:29:12,721 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 27 [2020-11-06 22:29:12,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:12,722 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-11-06 22:29:12,722 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:29:12,722 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-11-06 22:29:12,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:29:12,723 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:12,723 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:12,934 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:12,935 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:12,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:12,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1855561256, now seen corresponding path program 5 times [2020-11-06 22:29:12,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:12,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390065890] [2020-11-06 22:29:12,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:12,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:13,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-11-06 22:29:13,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,111 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:13,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390065890] [2020-11-06 22:29:13,111 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1864923023] [2020-11-06 22:29:13,112 INFO L93 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 [2020-11-06 22:29:13,197 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-11-06 22:29:13,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:13,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-06 22:29:13,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:13,231 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:13,232 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:13,232 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-11-06 22:29:13,232 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463288793] [2020-11-06 22:29:13,232 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-06 22:29:13,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:13,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-06 22:29:13,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:29:13,234 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-11-06 22:29:13,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:13,311 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-11-06 22:29:13,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-06 22:29:13,311 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 29 [2020-11-06 22:29:13,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:13,312 INFO L225 Difference]: With dead ends: 46 [2020-11-06 22:29:13,312 INFO L226 Difference]: Without dead ends: 33 [2020-11-06 22:29:13,313 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:29:13,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-11-06 22:29:13,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-11-06 22:29:13,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:29:13,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-11-06 22:29:13,318 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 29 [2020-11-06 22:29:13,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:13,319 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-11-06 22:29:13,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-06 22:29:13,319 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-11-06 22:29:13,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-11-06 22:29:13,320 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:13,320 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:13,531 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-06 22:29:13,532 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:13,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:13,533 INFO L82 PathProgramCache]: Analyzing trace with hash -510675898, now seen corresponding path program 6 times [2020-11-06 22:29:13,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:13,533 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643913904] [2020-11-06 22:29:13,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:13,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:13,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:29:13,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:13,686 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:13,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643913904] [2020-11-06 22:29:13,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331012424] [2020-11-06 22:29:13,686 INFO L93 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 [2020-11-06 22:29:13,972 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-11-06 22:29:13,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:13,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:29:13,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:14,010 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:14,011 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:14,011 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2020-11-06 22:29:14,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769151308] [2020-11-06 22:29:14,012 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-06 22:29:14,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:14,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-06 22:29:14,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:29:14,013 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 11 states. [2020-11-06 22:29:14,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:14,106 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-11-06 22:29:14,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:29:14,107 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-11-06 22:29:14,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:14,108 INFO L225 Difference]: With dead ends: 48 [2020-11-06 22:29:14,108 INFO L226 Difference]: Without dead ends: 35 [2020-11-06 22:29:14,108 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:29:14,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-06 22:29:14,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2020-11-06 22:29:14,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-06 22:29:14,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2020-11-06 22:29:14,113 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 31 [2020-11-06 22:29:14,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:14,114 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2020-11-06 22:29:14,114 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-06 22:29:14,114 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2020-11-06 22:29:14,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-11-06 22:29:14,115 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:14,115 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:14,326 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:14,327 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:14,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:14,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1868085988, now seen corresponding path program 7 times [2020-11-06 22:29:14,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:14,329 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341290802] [2020-11-06 22:29:14,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:14,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:14,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:14,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:14,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-11-06 22:29:14,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:14,521 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:14,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341290802] [2020-11-06 22:29:14,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820253105] [2020-11-06 22:29:14,522 INFO L93 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 [2020-11-06 22:29:14,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:14,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-06 22:29:14,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:14,626 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:14,626 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:14,627 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2020-11-06 22:29:14,627 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778413830] [2020-11-06 22:29:14,627 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-06 22:29:14,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:14,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-06 22:29:14,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:29:14,628 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 12 states. [2020-11-06 22:29:14,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:14,757 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-11-06 22:29:14,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:29:14,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-11-06 22:29:14,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:14,758 INFO L225 Difference]: With dead ends: 50 [2020-11-06 22:29:14,758 INFO L226 Difference]: Without dead ends: 37 [2020-11-06 22:29:14,759 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:29:14,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-06 22:29:14,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-11-06 22:29:14,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-06 22:29:14,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-11-06 22:29:14,765 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 33 [2020-11-06 22:29:14,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:14,765 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-11-06 22:29:14,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-06 22:29:14,765 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-11-06 22:29:14,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-11-06 22:29:14,766 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:14,767 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:14,978 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:14,979 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:14,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:14,980 INFO L82 PathProgramCache]: Analyzing trace with hash -1359310334, now seen corresponding path program 8 times [2020-11-06 22:29:14,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:14,981 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22760376] [2020-11-06 22:29:14,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:15,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:15,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-11-06 22:29:15,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,152 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:15,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22760376] [2020-11-06 22:29:15,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020302582] [2020-11-06 22:29:15,152 INFO L93 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 [2020-11-06 22:29:15,219 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:29:15,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:15,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-06 22:29:15,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:15,255 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:15,256 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:15,256 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-11-06 22:29:15,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119018367] [2020-11-06 22:29:15,257 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:29:15,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:15,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:29:15,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:29:15,258 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 13 states. [2020-11-06 22:29:15,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:15,358 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2020-11-06 22:29:15,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-11-06 22:29:15,358 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-11-06 22:29:15,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:15,359 INFO L225 Difference]: With dead ends: 52 [2020-11-06 22:29:15,359 INFO L226 Difference]: Without dead ends: 39 [2020-11-06 22:29:15,360 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:29:15,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-06 22:29:15,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2020-11-06 22:29:15,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-11-06 22:29:15,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-11-06 22:29:15,365 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 35 [2020-11-06 22:29:15,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:15,365 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-11-06 22:29:15,365 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:29:15,366 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-11-06 22:29:15,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-11-06 22:29:15,366 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:15,367 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:15,577 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-06 22:29:15,578 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:15,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:15,579 INFO L82 PathProgramCache]: Analyzing trace with hash -1920788064, now seen corresponding path program 9 times [2020-11-06 22:29:15,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:15,580 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249584780] [2020-11-06 22:29:15,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:15,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:15,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-11-06 22:29:15,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:15,743 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:15,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249584780] [2020-11-06 22:29:15,743 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853583835] [2020-11-06 22:29:15,743 INFO L93 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 [2020-11-06 22:29:16,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-11-06 22:29:16,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:16,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-06 22:29:16,072 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:16,109 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:16,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:16,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2020-11-06 22:29:16,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861160109] [2020-11-06 22:29:16,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-06 22:29:16,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:16,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-06 22:29:16,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:29:16,113 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 14 states. [2020-11-06 22:29:16,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:16,259 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-11-06 22:29:16,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-06 22:29:16,260 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-11-06 22:29:16,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:16,261 INFO L225 Difference]: With dead ends: 54 [2020-11-06 22:29:16,261 INFO L226 Difference]: Without dead ends: 41 [2020-11-06 22:29:16,261 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:29:16,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-11-06 22:29:16,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2020-11-06 22:29:16,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-06 22:29:16,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2020-11-06 22:29:16,274 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 37 [2020-11-06 22:29:16,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:16,276 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2020-11-06 22:29:16,276 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-06 22:29:16,276 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2020-11-06 22:29:16,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-06 22:29:16,277 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:16,278 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:16,478 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:16,478 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:16,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:16,479 INFO L82 PathProgramCache]: Analyzing trace with hash -335007298, now seen corresponding path program 10 times [2020-11-06 22:29:16,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:16,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213951031] [2020-11-06 22:29:16,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:16,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:16,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:16,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:16,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-11-06 22:29:16,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:16,713 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:16,713 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213951031] [2020-11-06 22:29:16,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [431207606] [2020-11-06 22:29:16,714 INFO L93 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 [2020-11-06 22:29:16,784 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:29:16,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:16,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 12 conjunts are in the unsatisfiable core [2020-11-06 22:29:16,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:16,817 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:16,818 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:16,818 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-11-06 22:29:16,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563899084] [2020-11-06 22:29:16,819 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-06 22:29:16,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:16,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-06 22:29:16,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:29:16,820 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 15 states. [2020-11-06 22:29:16,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:16,938 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2020-11-06 22:29:16,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-06 22:29:16,938 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 39 [2020-11-06 22:29:16,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:16,939 INFO L225 Difference]: With dead ends: 56 [2020-11-06 22:29:16,939 INFO L226 Difference]: Without dead ends: 43 [2020-11-06 22:29:16,939 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-11-06 22:29:16,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-11-06 22:29:16,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2020-11-06 22:29:16,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-06 22:29:16,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-11-06 22:29:16,949 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 39 [2020-11-06 22:29:16,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:16,949 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-11-06 22:29:16,950 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-06 22:29:16,950 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-11-06 22:29:16,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-06 22:29:16,951 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:16,951 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:17,154 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:17,155 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:17,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:17,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1113081252, now seen corresponding path program 11 times [2020-11-06 22:29:17,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:17,156 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619910689] [2020-11-06 22:29:17,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:17,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:17,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:17,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:17,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-11-06 22:29:17,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:17,365 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:17,365 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619910689] [2020-11-06 22:29:17,365 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460679640] [2020-11-06 22:29:17,366 INFO L93 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 [2020-11-06 22:29:17,628 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2020-11-06 22:29:17,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:17,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 13 conjunts are in the unsatisfiable core [2020-11-06 22:29:17,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:17,704 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:17,704 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:17,704 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2020-11-06 22:29:17,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973576517] [2020-11-06 22:29:17,705 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-06 22:29:17,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:17,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-06 22:29:17,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-11-06 22:29:17,706 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 16 states. [2020-11-06 22:29:17,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:17,865 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2020-11-06 22:29:17,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-06 22:29:17,865 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-11-06 22:29:17,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:17,866 INFO L225 Difference]: With dead ends: 58 [2020-11-06 22:29:17,866 INFO L226 Difference]: Without dead ends: 45 [2020-11-06 22:29:17,867 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-11-06 22:29:17,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-11-06 22:29:17,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-11-06 22:29:17,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-11-06 22:29:17,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2020-11-06 22:29:17,877 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 41 [2020-11-06 22:29:17,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:17,877 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2020-11-06 22:29:17,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-06 22:29:17,877 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2020-11-06 22:29:17,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-11-06 22:29:17,878 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:17,879 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:18,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-11-06 22:29:18,093 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:18,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:18,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1517841542, now seen corresponding path program 12 times [2020-11-06 22:29:18,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:18,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169890835] [2020-11-06 22:29:18,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:18,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:18,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:18,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:18,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2020-11-06 22:29:18,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:18,336 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:18,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169890835] [2020-11-06 22:29:18,337 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037239787] [2020-11-06 22:29:18,337 INFO L93 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 [2020-11-06 22:29:18,873 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-11-06 22:29:18,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:18,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 14 conjunts are in the unsatisfiable core [2020-11-06 22:29:18,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:18,918 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:18,919 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:18,919 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2020-11-06 22:29:18,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144121040] [2020-11-06 22:29:18,920 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-06 22:29:18,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:18,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-06 22:29:18,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-11-06 22:29:18,921 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 17 states. [2020-11-06 22:29:19,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:19,020 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2020-11-06 22:29:19,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-06 22:29:19,021 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-11-06 22:29:19,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:19,021 INFO L225 Difference]: With dead ends: 60 [2020-11-06 22:29:19,021 INFO L226 Difference]: Without dead ends: 47 [2020-11-06 22:29:19,022 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-11-06 22:29:19,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-11-06 22:29:19,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2020-11-06 22:29:19,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-06 22:29:19,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2020-11-06 22:29:19,027 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 43 [2020-11-06 22:29:19,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:19,027 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2020-11-06 22:29:19,028 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-06 22:29:19,028 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2020-11-06 22:29:19,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-06 22:29:19,028 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:19,029 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:19,233 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-11-06 22:29:19,234 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:19,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:19,235 INFO L82 PathProgramCache]: Analyzing trace with hash 349543704, now seen corresponding path program 13 times [2020-11-06 22:29:19,235 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:19,235 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882689566] [2020-11-06 22:29:19,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:19,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:19,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:19,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:19,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:29:19,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:19,481 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:19,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882689566] [2020-11-06 22:29:19,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [302047004] [2020-11-06 22:29:19,482 INFO L93 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 [2020-11-06 22:29:19,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:19,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 15 conjunts are in the unsatisfiable core [2020-11-06 22:29:19,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:19,614 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:19,615 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:19,615 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2020-11-06 22:29:19,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101867267] [2020-11-06 22:29:19,616 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-06 22:29:19,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:19,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-06 22:29:19,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-11-06 22:29:19,617 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 18 states. [2020-11-06 22:29:19,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:19,756 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2020-11-06 22:29:19,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:29:19,757 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 45 [2020-11-06 22:29:19,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:19,758 INFO L225 Difference]: With dead ends: 62 [2020-11-06 22:29:19,758 INFO L226 Difference]: Without dead ends: 49 [2020-11-06 22:29:19,758 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-11-06 22:29:19,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-11-06 22:29:19,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2020-11-06 22:29:19,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-06 22:29:19,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-11-06 22:29:19,764 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 45 [2020-11-06 22:29:19,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:19,764 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-11-06 22:29:19,764 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-06 22:29:19,764 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-11-06 22:29:19,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-11-06 22:29:19,765 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:19,765 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:19,975 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-06 22:29:19,975 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:19,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:19,976 INFO L82 PathProgramCache]: Analyzing trace with hash -389564618, now seen corresponding path program 14 times [2020-11-06 22:29:19,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:19,977 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112814579] [2020-11-06 22:29:19,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:19,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:20,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:20,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:20,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2020-11-06 22:29:20,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:20,247 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:20,247 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112814579] [2020-11-06 22:29:20,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1636692347] [2020-11-06 22:29:20,248 INFO L93 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 [2020-11-06 22:29:20,334 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:29:20,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:20,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 16 conjunts are in the unsatisfiable core [2020-11-06 22:29:20,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:20,370 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:20,370 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:20,370 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2020-11-06 22:29:20,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609309413] [2020-11-06 22:29:20,371 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-06 22:29:20,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:20,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-06 22:29:20,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:29:20,372 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 19 states. [2020-11-06 22:29:20,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:20,512 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2020-11-06 22:29:20,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-06 22:29:20,513 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2020-11-06 22:29:20,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:20,514 INFO L225 Difference]: With dead ends: 64 [2020-11-06 22:29:20,514 INFO L226 Difference]: Without dead ends: 51 [2020-11-06 22:29:20,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:29:20,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-11-06 22:29:20,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2020-11-06 22:29:20,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-06 22:29:20,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2020-11-06 22:29:20,520 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 47 [2020-11-06 22:29:20,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:20,520 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2020-11-06 22:29:20,520 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-06 22:29:20,520 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2020-11-06 22:29:20,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-11-06 22:29:20,521 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:20,521 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:20,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:20,734 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:20,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:20,735 INFO L82 PathProgramCache]: Analyzing trace with hash -2003058220, now seen corresponding path program 15 times [2020-11-06 22:29:20,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:20,735 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816547375] [2020-11-06 22:29:20,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:20,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:21,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:21,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:21,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2020-11-06 22:29:21,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:21,086 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:21,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816547375] [2020-11-06 22:29:21,087 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805977668] [2020-11-06 22:29:21,087 INFO L93 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 [2020-11-06 22:29:22,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2020-11-06 22:29:22,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:22,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 17 conjunts are in the unsatisfiable core [2020-11-06 22:29:22,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:22,546 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:22,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:22,547 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2020-11-06 22:29:22,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [93841932] [2020-11-06 22:29:22,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-06 22:29:22,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:22,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-06 22:29:22,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-11-06 22:29:22,548 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 20 states. [2020-11-06 22:29:22,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:22,666 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2020-11-06 22:29:22,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-06 22:29:22,667 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 49 [2020-11-06 22:29:22,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:22,667 INFO L225 Difference]: With dead ends: 66 [2020-11-06 22:29:22,668 INFO L226 Difference]: Without dead ends: 53 [2020-11-06 22:29:22,668 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-11-06 22:29:22,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-06 22:29:22,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2020-11-06 22:29:22,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-11-06 22:29:22,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2020-11-06 22:29:22,673 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 49 [2020-11-06 22:29:22,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:22,674 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2020-11-06 22:29:22,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-06 22:29:22,674 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2020-11-06 22:29:22,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-11-06 22:29:22,675 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:22,675 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:22,885 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-11-06 22:29:22,886 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:22,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:22,887 INFO L82 PathProgramCache]: Analyzing trace with hash -2087215886, now seen corresponding path program 16 times [2020-11-06 22:29:22,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:22,887 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545940008] [2020-11-06 22:29:22,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:22,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:23,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:23,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:23,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-11-06 22:29:23,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:23,200 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:23,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545940008] [2020-11-06 22:29:23,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476236033] [2020-11-06 22:29:23,200 INFO L93 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 [2020-11-06 22:29:23,278 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:29:23,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:23,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 18 conjunts are in the unsatisfiable core [2020-11-06 22:29:23,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:23,335 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:23,335 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:23,335 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2020-11-06 22:29:23,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830815798] [2020-11-06 22:29:23,336 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-06 22:29:23,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:23,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-06 22:29:23,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-11-06 22:29:23,337 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 21 states. [2020-11-06 22:29:23,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:23,530 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2020-11-06 22:29:23,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-11-06 22:29:23,531 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 51 [2020-11-06 22:29:23,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:23,532 INFO L225 Difference]: With dead ends: 68 [2020-11-06 22:29:23,532 INFO L226 Difference]: Without dead ends: 55 [2020-11-06 22:29:23,533 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-11-06 22:29:23,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-06 22:29:23,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2020-11-06 22:29:23,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-11-06 22:29:23,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-11-06 22:29:23,538 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 51 [2020-11-06 22:29:23,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:23,538 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-11-06 22:29:23,538 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-06 22:29:23,538 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-11-06 22:29:23,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-11-06 22:29:23,539 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:23,539 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:23,749 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-11-06 22:29:23,749 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:23,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:23,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1358354288, now seen corresponding path program 17 times [2020-11-06 22:29:23,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:23,751 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288122080] [2020-11-06 22:29:23,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:23,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:24,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:24,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:24,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2020-11-06 22:29:24,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:24,082 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:24,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288122080] [2020-11-06 22:29:24,082 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [204777355] [2020-11-06 22:29:24,082 INFO L93 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 [2020-11-06 22:29:27,630 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2020-11-06 22:29:27,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:27,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-06 22:29:27,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:27,711 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:27,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:27,711 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2020-11-06 22:29:27,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27437011] [2020-11-06 22:29:27,713 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-06 22:29:27,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:27,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-06 22:29:27,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-11-06 22:29:27,715 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 22 states. [2020-11-06 22:29:27,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:27,844 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2020-11-06 22:29:27,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-06 22:29:27,845 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 53 [2020-11-06 22:29:27,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:27,846 INFO L225 Difference]: With dead ends: 70 [2020-11-06 22:29:27,846 INFO L226 Difference]: Without dead ends: 57 [2020-11-06 22:29:27,847 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-11-06 22:29:27,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-11-06 22:29:27,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2020-11-06 22:29:27,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-06 22:29:27,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2020-11-06 22:29:27,851 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 53 [2020-11-06 22:29:27,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:27,851 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2020-11-06 22:29:27,852 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-06 22:29:27,852 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2020-11-06 22:29:27,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-11-06 22:29:27,852 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:27,852 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:28,053 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:28,053 INFO L429 AbstractCegarLoop]: === Iteration 20 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:28,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:28,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1002027858, now seen corresponding path program 18 times [2020-11-06 22:29:28,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:28,055 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [716072604] [2020-11-06 22:29:28,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:28,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:28,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:28,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:28,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2020-11-06 22:29:28,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:28,443 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:28,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [716072604] [2020-11-06 22:29:28,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210030813] [2020-11-06 22:29:28,444 INFO L93 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 [2020-11-06 22:29:32,344 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2020-11-06 22:29:32,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:29:32,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 20 conjunts are in the unsatisfiable core [2020-11-06 22:29:32,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:32,460 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:32,460 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:32,460 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2020-11-06 22:29:32,460 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939284260] [2020-11-06 22:29:32,461 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-06 22:29:32,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:32,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-06 22:29:32,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:29:32,462 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 23 states. [2020-11-06 22:29:32,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:32,639 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2020-11-06 22:29:32,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-06 22:29:32,639 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 55 [2020-11-06 22:29:32,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:32,640 INFO L225 Difference]: With dead ends: 72 [2020-11-06 22:29:32,640 INFO L226 Difference]: Without dead ends: 59 [2020-11-06 22:29:32,641 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:29:32,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-11-06 22:29:32,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2020-11-06 22:29:32,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-11-06 22:29:32,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2020-11-06 22:29:32,645 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 55 [2020-11-06 22:29:32,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:32,646 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2020-11-06 22:29:32,646 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-06 22:29:32,646 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2020-11-06 22:29:32,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-11-06 22:29:32,647 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:32,647 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:32,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:32,857 INFO L429 AbstractCegarLoop]: === Iteration 21 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:32,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:32,858 INFO L82 PathProgramCache]: Analyzing trace with hash 2125254988, now seen corresponding path program 19 times [2020-11-06 22:29:32,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:32,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209111527] [2020-11-06 22:29:32,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:32,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:33,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:29:33,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:33,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2020-11-06 22:29:33,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:33,243 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209111527] [2020-11-06 22:29:33,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1252479197] [2020-11-06 22:29:33,248 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:33,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:29:33,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 21 conjunts are in the unsatisfiable core [2020-11-06 22:29:33,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:29:33,403 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:29:33,404 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:29:33,404 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2020-11-06 22:29:33,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101574419] [2020-11-06 22:29:33,404 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-11-06 22:29:33,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:29:33,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-11-06 22:29:33,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-11-06 22:29:33,406 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 24 states. [2020-11-06 22:29:33,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:29:33,597 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2020-11-06 22:29:33,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-06 22:29:33,598 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 57 [2020-11-06 22:29:33,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:29:33,599 INFO L225 Difference]: With dead ends: 73 [2020-11-06 22:29:33,599 INFO L226 Difference]: Without dead ends: 60 [2020-11-06 22:29:33,601 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-11-06 22:29:33,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-11-06 22:29:33,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-11-06 22:29:33,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-11-06 22:29:33,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-11-06 22:29:33,605 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 57 [2020-11-06 22:29:33,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:29:33,605 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-11-06 22:29:33,606 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-11-06 22:29:33,606 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-11-06 22:29:33,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-11-06 22:29:33,606 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:29:33,606 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:29:33,819 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:29:33,820 INFO L429 AbstractCegarLoop]: === Iteration 22 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:29:33,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:29:33,821 INFO L82 PathProgramCache]: Analyzing trace with hash 966962794, now seen corresponding path program 20 times [2020-11-06 22:29:33,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:29:33,821 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1602630761] [2020-11-06 22:29:33,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:29:33,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:29:33,937 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:29:34,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:29:34,082 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:29:34,132 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:29:34,132 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:29:34,132 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-11-06 22:29:34,230 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:29:34 BoogieIcfgContainer [2020-11-06 22:29:34,230 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:29:34,233 INFO L168 Benchmark]: Toolchain (without parser) took 25229.87 ms. Allocated memory was 159.4 MB in the beginning and 244.3 MB in the end (delta: 84.9 MB). Free memory was 135.4 MB in the beginning and 132.5 MB in the end (delta: 2.9 MB). Peak memory consumption was 89.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:29:34,233 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 159.4 MB. Free memory is still 130.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:29:34,234 INFO L168 Benchmark]: CACSL2BoogieTranslator took 264.92 ms. Allocated memory is still 159.4 MB. Free memory was 134.7 MB in the beginning and 125.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:29:34,234 INFO L168 Benchmark]: Boogie Preprocessor took 35.25 ms. Allocated memory is still 159.4 MB. Free memory was 124.9 MB in the beginning and 123.4 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:29:34,235 INFO L168 Benchmark]: RCFGBuilder took 555.57 ms. Allocated memory is still 159.4 MB. Free memory was 123.4 MB in the beginning and 107.9 MB in the end (delta: 15.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-11-06 22:29:34,235 INFO L168 Benchmark]: TraceAbstraction took 24357.04 ms. Allocated memory was 159.4 MB in the beginning and 244.3 MB in the end (delta: 84.9 MB). Free memory was 107.5 MB in the beginning and 132.5 MB in the end (delta: -25.0 MB). Peak memory consumption was 60.8 MB. Max. memory is 8.0 GB. [2020-11-06 22:29:34,244 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 159.4 MB. Free memory is still 130.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 264.92 ms. Allocated memory is still 159.4 MB. Free memory was 134.7 MB in the beginning and 125.1 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.25 ms. Allocated memory is still 159.4 MB. Free memory was 124.9 MB in the beginning and 123.4 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 555.57 ms. Allocated memory is still 159.4 MB. Free memory was 123.4 MB in the beginning and 107.9 MB in the end (delta: 15.5 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 24357.04 ms. Allocated memory was 159.4 MB in the beginning and 244.3 MB in the end (delta: 84.9 MB). Free memory was 107.5 MB in the beginning and 132.5 MB in the end (delta: -25.0 MB). Peak memory consumption was 60.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L17] struct dummy ad1[20], *ad2; [L18] int i, j, *pa; [L19] j=0 VAL [ad1={3:0}, j=0] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=1] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=2] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=3] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=4] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=5] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=6] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=7] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=8] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=9] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=10] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=11] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=12] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=13] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=14] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=15] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=16] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=17] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=18] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=19] [L19] COND TRUE j<20 [L20] ad1[j].a = __VERIFIER_nondet_int() [L21] ad1[j].b = __VERIFIER_nondet_int() [L19] j++ VAL [ad1={3:0}, j=20] [L19] COND FALSE !(j<20) VAL [ad1={3:0}, j=20] [L23] i = __VERIFIER_nondet_int() [L24] COND TRUE i >= 0 && i < 10 [L25] ad2 = ad1 [L26] ad1[i].a = i [L27] pa = &ad1[i].a [L28] EXPR ad2[i].a [L28] i = ad2[i].a + 10 [L29] EXPR \read(*pa) VAL [\read(*pa)=0, ad1={3:0}, ad2={3:0}, i=10, j=20, pa={3:0}] [L29] COND FALSE !(i < *pa) [L32] CALL, EXPR check(ad1, i) VAL [\old(b)=10, ad1={3:0}] [L12] EXPR ad1[b].a [L12] return ad1[b].a == b; [L32] RET, EXPR check(ad1, i) VAL [ad1={3:0}, ad2={3:0}, check(ad1, i)=0, i=10, j=20, pa={3:0}] [L32] COND TRUE !check(ad1, i) [L39] CALL reach_error() [L3] __assert_fail("0", "test24-2.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 29 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 24.1s, OverallIterations: 22, TraceHistogramMax: 20, AutomataDifference: 2.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 386 SDtfs, 273 SDslu, 2214 SDs, 0 SdLazy, 1577 SolverSat, 90 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1058 GetRequests, 808 SyntacticMatches, 0 SemanticMatches, 250 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 3.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 21 MinimizatonAttempts, 19 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.3s SsaConstructionTime, 10.9s SatisfiabilityAnalysisTime, 5.0s InterpolantComputationTime, 1578 NumberOfCodeBlocks, 1578 NumberOfCodeBlocksAsserted, 143 NumberOfCheckSat, 1479 ConstructedInterpolants, 0 QuantifiedInterpolants, 152559 SizeOfPredicates, 19 NumberOfNonLiveVariables, 4085 ConjunctsInSsa, 228 ConjunctsInUnsatCore, 40 InterpolantComputations, 2 PerfectInterpolantSequences, 0/4940 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...