/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/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:44:59,947 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:44:59,950 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:44:59,989 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-06 22:45:00,058 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:45:00,060 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:45:00,061 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:45:00,062 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 22:45:00,092 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:45:00,093 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:45:00,094 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:45:00,095 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:45:00,095 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:45:00,095 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:45:00,096 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:45:00,096 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:45:00,096 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:45:00,097 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:45:00,097 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:45:00,097 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:45:00,097 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:45:00,098 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:45:00,098 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:45:00,098 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:45:00,098 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:45:00,099 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:45:00,099 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:45:00,099 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:45:00,100 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:45:00,100 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:45:00,100 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:45:00,101 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:45:00,101 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:45:00,101 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:45:00,102 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:45:00,102 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:45:00,102 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:45:00,102 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:45:00,529 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:45:00,563 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:45:00,567 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:45:00,569 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:45:00,570 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:45:00,571 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-11-06 22:45:00,654 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b3432294/17ff9aac93d14640b1e322e7e2ac2341/FLAG919b39087 [2020-11-06 22:45:01,302 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:45:01,303 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2020-11-06 22:45:01,312 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b3432294/17ff9aac93d14640b1e322e7e2ac2341/FLAG919b39087 [2020-11-06 22:45:01,652 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9b3432294/17ff9aac93d14640b1e322e7e2ac2341 [2020-11-06 22:45:01,655 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:45:01,663 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:45:01,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:01,665 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:45:01,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:45:01,670 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,674 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@700b6c71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01, skipping insertion in model container [2020-11-06 22:45:01,674 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,683 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:45:01,700 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:45:01,898 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:01,908 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:45:01,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:45:01,952 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:45:01,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01 WrapperNode [2020-11-06 22:45:01,953 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:45:01,955 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:45:01,955 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:45:01,955 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:45:01,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,972 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,981 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,981 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,990 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:01,998 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (1/1) ... [2020-11-06 22:45:02,001 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:45:02,002 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:45:02,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:45:02,003 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:45:02,004 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (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 22:45:02,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:45:02,099 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:45:02,099 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:45:02,099 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-06 22:45:02,099 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:45:02,099 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:45:02,100 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:45:02,100 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:45:02,100 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:45:02,100 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:45:02,101 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:45:02,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:45:02,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:45:02,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:45:02,756 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:45:02,756 INFO L298 CfgBuilder]: Removed 3 assume(true) statements. [2020-11-06 22:45:02,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:02 BoogieIcfgContainer [2020-11-06 22:45:02,758 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:45:02,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:45:02,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:45:02,767 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:45:02,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:45:01" (1/3) ... [2020-11-06 22:45:02,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fa01b38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:02, skipping insertion in model container [2020-11-06 22:45:02,770 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:45:01" (2/3) ... [2020-11-06 22:45:02,770 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5fa01b38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:45:02, skipping insertion in model container [2020-11-06 22:45:02,771 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:45:02" (3/3) ... [2020-11-06 22:45:02,773 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-11-06 22:45:02,794 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:45:02,801 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:45:02,814 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:45:02,870 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:45:02,870 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:45:02,871 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:45:02,871 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:45:02,871 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:45:02,871 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:45:02,871 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:45:02,871 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:45:02,896 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-11-06 22:45:02,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-06 22:45:02,904 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:02,907 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 22:45:02,908 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:02,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:02,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1650101419, now seen corresponding path program 1 times [2020-11-06 22:45:02,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:02,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45602851] [2020-11-06 22:45:02,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:03,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:03,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:03,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:03,284 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 22:45:03,284 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45602851] [2020-11-06 22:45:03,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:45:03,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-06 22:45:03,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764726281] [2020-11-06 22:45:03,293 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-06 22:45:03,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:03,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-06 22:45:03,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:45:03,317 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 3 states. [2020-11-06 22:45:03,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:03,474 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-11-06 22:45:03,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-06 22:45:03,479 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-11-06 22:45:03,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:03,489 INFO L225 Difference]: With dead ends: 56 [2020-11-06 22:45:03,490 INFO L226 Difference]: Without dead ends: 25 [2020-11-06 22:45:03,499 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-06 22:45:03,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-06 22:45:03,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-11-06 22:45:03,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-06 22:45:03,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-11-06 22:45:03,554 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 18 [2020-11-06 22:45:03,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:03,555 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-11-06 22:45:03,555 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-06 22:45:03,555 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-11-06 22:45:03,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-06 22:45:03,557 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:03,558 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 22:45:03,558 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:45:03,558 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:03,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:03,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1036103897, now seen corresponding path program 1 times [2020-11-06 22:45:03,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:03,560 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999992223] [2020-11-06 22:45:03,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:03,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:03,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:03,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:03,746 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 22:45:03,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999992223] [2020-11-06 22:45:03,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:45:03,748 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-06 22:45:03,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354626319] [2020-11-06 22:45:03,750 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-06 22:45:03,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:03,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-06 22:45:03,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-11-06 22:45:03,752 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-11-06 22:45:03,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:03,964 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-11-06 22:45:03,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:45:03,965 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-11-06 22:45:03,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:03,968 INFO L225 Difference]: With dead ends: 46 [2020-11-06 22:45:03,968 INFO L226 Difference]: Without dead ends: 31 [2020-11-06 22:45:03,970 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:45:03,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-11-06 22:45:03,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-11-06 22:45:03,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-11-06 22:45:03,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-11-06 22:45:03,983 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-11-06 22:45:03,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:03,983 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-11-06 22:45:03,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-06 22:45:03,984 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-11-06 22:45:03,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-11-06 22:45:03,985 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:03,985 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] [2020-11-06 22:45:03,985 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:45:03,985 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:03,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:03,986 INFO L82 PathProgramCache]: Analyzing trace with hash 2052176411, now seen corresponding path program 1 times [2020-11-06 22:45:03,987 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:03,987 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374003135] [2020-11-06 22:45:03,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:04,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:04,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:04,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:04,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:04,185 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374003135] [2020-11-06 22:45:04,185 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:45:04,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-06 22:45:04,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838154586] [2020-11-06 22:45:04,189 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-06 22:45:04,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:04,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-06 22:45:04,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-06 22:45:04,193 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2020-11-06 22:45:04,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:04,539 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2020-11-06 22:45:04,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:45:04,540 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-11-06 22:45:04,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:04,541 INFO L225 Difference]: With dead ends: 39 [2020-11-06 22:45:04,542 INFO L226 Difference]: Without dead ends: 27 [2020-11-06 22:45:04,542 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:04,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-06 22:45:04,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-11-06 22:45:04,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-11-06 22:45:04,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-11-06 22:45:04,551 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 20 [2020-11-06 22:45:04,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:04,552 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-11-06 22:45:04,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-06 22:45:04,552 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-11-06 22:45:04,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-11-06 22:45:04,553 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:04,553 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:04,553 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-06 22:45:04,553 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:04,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:04,554 INFO L82 PathProgramCache]: Analyzing trace with hash 645358365, now seen corresponding path program 1 times [2020-11-06 22:45:04,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:04,555 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910207182] [2020-11-06 22:45:04,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:04,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:05,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:05,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:05,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:05,267 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910207182] [2020-11-06 22:45:05,268 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95105304] [2020-11-06 22:45:05,268 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 22:45:05,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:05,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 22 conjunts are in the unsatisfiable core [2020-11-06 22:45:05,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:05,508 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-06 22:45:05,510 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:05,528 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:05,528 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:05,529 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-11-06 22:45:05,762 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2020-11-06 22:45:05,763 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:05,787 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:05,788 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:05,788 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2020-11-06 22:45:06,010 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:06,011 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 20 [2020-11-06 22:45:06,012 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-06 22:45:06,046 INFO L625 ElimStorePlain]: treesize reduction 7, result has 66.7 percent of original size [2020-11-06 22:45:06,050 INFO L547 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:06,051 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:38, output treesize:3 [2020-11-06 22:45:06,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:06,121 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:06,121 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2020-11-06 22:45:06,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175573829] [2020-11-06 22:45:06,122 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-06 22:45:06,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:06,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-06 22:45:06,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2020-11-06 22:45:06,125 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 21 states. [2020-11-06 22:45:07,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:07,228 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-11-06 22:45:07,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:45:07,228 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 22 [2020-11-06 22:45:07,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:07,230 INFO L225 Difference]: With dead ends: 50 [2020-11-06 22:45:07,230 INFO L226 Difference]: Without dead ends: 47 [2020-11-06 22:45:07,231 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=181, Invalid=811, Unknown=0, NotChecked=0, Total=992 [2020-11-06 22:45:07,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-11-06 22:45:07,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-11-06 22:45:07,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-11-06 22:45:07,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2020-11-06 22:45:07,242 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 22 [2020-11-06 22:45:07,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:07,242 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2020-11-06 22:45:07,242 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-06 22:45:07,242 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2020-11-06 22:45:07,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-11-06 22:45:07,243 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:07,243 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, 1] [2020-11-06 22:45:07,458 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:07,459 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:07,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:07,461 INFO L82 PathProgramCache]: Analyzing trace with hash 494730079, now seen corresponding path program 2 times [2020-11-06 22:45:07,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:07,462 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183445076] [2020-11-06 22:45:07,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:07,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:07,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:07,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:07,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:07,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183445076] [2020-11-06 22:45:07,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119862766] [2020-11-06 22:45:07,606 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 22:45:07,670 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:45:07,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:07,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:45:07,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:07,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:07,698 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:07,699 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 7 [2020-11-06 22:45:07,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289737506] [2020-11-06 22:45:07,699 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-06 22:45:07,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:07,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-06 22:45:07,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-11-06 22:45:07,701 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 7 states. [2020-11-06 22:45:07,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:07,916 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-11-06 22:45:07,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:45:07,917 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-11-06 22:45:07,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:07,919 INFO L225 Difference]: With dead ends: 61 [2020-11-06 22:45:07,919 INFO L226 Difference]: Without dead ends: 49 [2020-11-06 22:45:07,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:45:07,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-11-06 22:45:07,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-11-06 22:45:07,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-11-06 22:45:07,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2020-11-06 22:45:07,931 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 24 [2020-11-06 22:45:07,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:07,931 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2020-11-06 22:45:07,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-06 22:45:07,931 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2020-11-06 22:45:07,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-11-06 22:45:07,937 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:07,937 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:08,138 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:08,139 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:08,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:08,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1411947679, now seen corresponding path program 3 times [2020-11-06 22:45:08,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:08,141 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333183136] [2020-11-06 22:45:08,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:08,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:08,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:08,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:08,672 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:08,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333183136] [2020-11-06 22:45:08,672 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298736506] [2020-11-06 22:45:08,673 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 22:45:08,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-06 22:45:08,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:08,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 27 conjunts are in the unsatisfiable core [2020-11-06 22:45:08,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:08,758 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-06 22:45:08,760 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:08,765 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:08,766 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:08,766 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-11-06 22:45:09,001 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-11-06 22:45:09,002 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:09,009 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:09,011 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:09,012 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-11-06 22:45:09,137 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:09,137 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-11-06 22:45:09,138 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-06 22:45:09,155 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-11-06 22:45:09,159 INFO L547 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:09,159 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:40, output treesize:3 [2020-11-06 22:45:09,225 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:09,225 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:09,225 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2020-11-06 22:45:09,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693012214] [2020-11-06 22:45:09,226 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-06 22:45:09,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:09,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-06 22:45:09,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=581, Unknown=0, NotChecked=0, Total=650 [2020-11-06 22:45:09,228 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand 26 states. [2020-11-06 22:45:10,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:10,809 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2020-11-06 22:45:10,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-06 22:45:10,809 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 26 [2020-11-06 22:45:10,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:10,814 INFO L225 Difference]: With dead ends: 72 [2020-11-06 22:45:10,815 INFO L226 Difference]: Without dead ends: 69 [2020-11-06 22:45:10,817 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=270, Invalid=1452, Unknown=0, NotChecked=0, Total=1722 [2020-11-06 22:45:10,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-11-06 22:45:10,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 47. [2020-11-06 22:45:10,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-06 22:45:10,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 52 transitions. [2020-11-06 22:45:10,842 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 52 transitions. Word has length 26 [2020-11-06 22:45:10,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:10,842 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 52 transitions. [2020-11-06 22:45:10,843 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-06 22:45:10,843 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 52 transitions. [2020-11-06 22:45:10,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:45:10,847 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:10,847 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:11,063 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:11,064 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:11,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:11,065 INFO L82 PathProgramCache]: Analyzing trace with hash -101512541, now seen corresponding path program 4 times [2020-11-06 22:45:11,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:11,066 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901906842] [2020-11-06 22:45:11,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:11,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:11,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:11,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:11,177 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901906842] [2020-11-06 22:45:11,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671165438] [2020-11-06 22:45:11,178 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 22:45:11,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-06 22:45:11,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:11,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 29 conjunts are in the unsatisfiable core [2020-11-06 22:45:11,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:11,252 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-06 22:45:11,253 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:11,257 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:11,257 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:11,258 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-11-06 22:45:11,361 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-11-06 22:45:11,362 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:11,373 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:11,374 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:11,374 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-11-06 22:45:11,557 INFO L348 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:11,558 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-11-06 22:45:11,558 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-06 22:45:11,574 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-11-06 22:45:11,578 INFO L547 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:11,578 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2020-11-06 22:45:11,632 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-11-06 22:45:11,633 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:11,633 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 19 [2020-11-06 22:45:11,634 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887156872] [2020-11-06 22:45:11,636 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-06 22:45:11,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:11,638 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-06 22:45:11,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:45:11,638 INFO L87 Difference]: Start difference. First operand 47 states and 52 transitions. Second operand 19 states. [2020-11-06 22:45:13,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:13,355 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2020-11-06 22:45:13,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-11-06 22:45:13,359 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 28 [2020-11-06 22:45:13,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:13,360 INFO L225 Difference]: With dead ends: 98 [2020-11-06 22:45:13,361 INFO L226 Difference]: Without dead ends: 83 [2020-11-06 22:45:13,363 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=286, Invalid=1520, Unknown=0, NotChecked=0, Total=1806 [2020-11-06 22:45:13,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-11-06 22:45:13,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 65. [2020-11-06 22:45:13,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-11-06 22:45:13,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2020-11-06 22:45:13,378 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 28 [2020-11-06 22:45:13,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:13,379 INFO L481 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2020-11-06 22:45:13,379 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-06 22:45:13,379 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2020-11-06 22:45:13,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-06 22:45:13,380 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:13,380 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:13,593 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:13,594 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:13,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:13,595 INFO L82 PathProgramCache]: Analyzing trace with hash -1512030973, now seen corresponding path program 1 times [2020-11-06 22:45:13,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:13,596 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [242611598] [2020-11-06 22:45:13,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:13,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:13,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-11-06 22:45:13,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:13,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [242611598] [2020-11-06 22:45:13,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1722286757] [2020-11-06 22:45:13,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -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 22:45:13,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:13,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:45:13,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:13,861 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:45:13,862 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:13,862 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2020-11-06 22:45:13,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012685779] [2020-11-06 22:45:13,866 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-06 22:45:13,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:13,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-06 22:45:13,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:45:13,867 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand 11 states. [2020-11-06 22:45:14,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:14,097 INFO L93 Difference]: Finished difference Result 101 states and 114 transitions. [2020-11-06 22:45:14,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:45:14,098 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-11-06 22:45:14,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:14,101 INFO L225 Difference]: With dead ends: 101 [2020-11-06 22:45:14,101 INFO L226 Difference]: Without dead ends: 69 [2020-11-06 22:45:14,102 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:45:14,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-11-06 22:45:14,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2020-11-06 22:45:14,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-11-06 22:45:14,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2020-11-06 22:45:14,116 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 30 [2020-11-06 22:45:14,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:14,116 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2020-11-06 22:45:14,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-06 22:45:14,117 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2020-11-06 22:45:14,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-06 22:45:14,118 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:14,118 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:14,331 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:14,331 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:14,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:14,332 INFO L82 PathProgramCache]: Analyzing trace with hash 1124512165, now seen corresponding path program 5 times [2020-11-06 22:45:14,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:14,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883368415] [2020-11-06 22:45:14,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:14,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:14,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:15,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:15,008 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:15,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883368415] [2020-11-06 22:45:15,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258198534] [2020-11-06 22:45:15,009 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 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 22:45:15,084 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-11-06 22:45:15,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:15,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 38 conjunts are in the unsatisfiable core [2020-11-06 22:45:15,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:15,095 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-11-06 22:45:15,097 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,107 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,107 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,108 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-11-06 22:45:15,120 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-06 22:45:15,120 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,131 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,133 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,133 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:14 [2020-11-06 22:45:15,155 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-06 22:45:15,156 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,170 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,172 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,173 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:17 [2020-11-06 22:45:15,183 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-11-06 22:45:15,183 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,201 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,204 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,204 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:20 [2020-11-06 22:45:15,279 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-11-06 22:45:15,280 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,296 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,296 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,297 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:34, output treesize:30 [2020-11-06 22:45:15,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,355 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 31 [2020-11-06 22:45:15,356 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,384 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,384 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,384 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:50, output treesize:46 [2020-11-06 22:45:15,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,460 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 40 [2020-11-06 22:45:15,461 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,485 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,485 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,485 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:58, output treesize:56 [2020-11-06 22:45:15,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,579 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,580 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 52 [2020-11-06 22:45:15,587 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,614 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,614 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,615 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:70, output treesize:66 [2020-11-06 22:45:15,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2020-11-06 22:45:15,822 INFO L173 IndexEqualityManager]: detected equality via solver [2020-11-06 22:45:15,824 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 4 disjoint index pairs (out of 15 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 19 [2020-11-06 22:45:15,825 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,833 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-06 22:45:15,837 INFO L547 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-06 22:45:15,838 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:65, output treesize:3 [2020-11-06 22:45:15,916 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:15,917 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:15,917 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 25 [2020-11-06 22:45:15,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699484461] [2020-11-06 22:45:15,918 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-11-06 22:45:15,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:15,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-11-06 22:45:15,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-11-06 22:45:15,919 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand 25 states. [2020-11-06 22:45:18,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:18,102 INFO L93 Difference]: Finished difference Result 97 states and 107 transitions. [2020-11-06 22:45:18,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-11-06 22:45:18,103 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 30 [2020-11-06 22:45:18,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:18,105 INFO L225 Difference]: With dead ends: 97 [2020-11-06 22:45:18,105 INFO L226 Difference]: Without dead ends: 94 [2020-11-06 22:45:18,107 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=269, Invalid=1623, Unknown=0, NotChecked=0, Total=1892 [2020-11-06 22:45:18,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-11-06 22:45:18,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 69. [2020-11-06 22:45:18,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-11-06 22:45:18,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 75 transitions. [2020-11-06 22:45:18,122 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 75 transitions. Word has length 30 [2020-11-06 22:45:18,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:18,122 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 75 transitions. [2020-11-06 22:45:18,122 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-11-06 22:45:18,122 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 75 transitions. [2020-11-06 22:45:18,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-11-06 22:45:18,123 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:18,124 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:18,339 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:45:18,340 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:18,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:18,341 INFO L82 PathProgramCache]: Analyzing trace with hash 1083762663, now seen corresponding path program 6 times [2020-11-06 22:45:18,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:18,342 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496442584] [2020-11-06 22:45:18,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:18,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:18,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:45:18,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:45:18,483 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:18,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496442584] [2020-11-06 22:45:18,483 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309288791] [2020-11-06 22:45:18,483 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 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 22:45:18,591 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2020-11-06 22:45:18,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:45:18,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 10 conjunts are in the unsatisfiable core [2020-11-06 22:45:18,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:45:18,633 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:45:18,633 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:45:18,633 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 9 [2020-11-06 22:45:18,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049682059] [2020-11-06 22:45:18,638 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:45:18,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:45:18,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:45:18,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:45:18,640 INFO L87 Difference]: Start difference. First operand 69 states and 75 transitions. Second operand 9 states. [2020-11-06 22:45:19,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:45:19,018 INFO L93 Difference]: Finished difference Result 106 states and 118 transitions. [2020-11-06 22:45:19,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-06 22:45:19,018 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2020-11-06 22:45:19,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:45:19,020 INFO L225 Difference]: With dead ends: 106 [2020-11-06 22:45:19,020 INFO L226 Difference]: Without dead ends: 94 [2020-11-06 22:45:19,020 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:45:19,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-11-06 22:45:19,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 71. [2020-11-06 22:45:19,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-11-06 22:45:19,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 77 transitions. [2020-11-06 22:45:19,035 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 77 transitions. Word has length 32 [2020-11-06 22:45:19,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:45:19,035 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 77 transitions. [2020-11-06 22:45:19,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:45:19,036 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 77 transitions. [2020-11-06 22:45:19,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-06 22:45:19,037 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:45:19,037 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:45:19,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-11-06 22:45:19,253 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:45:19,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:45:19,254 INFO L82 PathProgramCache]: Analyzing trace with hash 762165575, now seen corresponding path program 2 times [2020-11-06 22:45:19,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:45:19,254 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687804817] [2020-11-06 22:45:19,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:45:19,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:45:19,290 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:45:19,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:45:19,329 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:45:19,367 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:45:19,368 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:45:19,369 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-11-06 22:45:19,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:45:19 BoogieIcfgContainer [2020-11-06 22:45:19,469 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:45:19,471 INFO L168 Benchmark]: Toolchain (without parser) took 17813.14 ms. Allocated memory was 156.2 MB in the beginning and 278.9 MB in the end (delta: 122.7 MB). Free memory was 131.8 MB in the beginning and 224.5 MB in the end (delta: -92.7 MB). Peak memory consumption was 31.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:19,471 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 156.2 MB. Free memory is still 130.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:45:19,472 INFO L168 Benchmark]: CACSL2BoogieTranslator took 289.40 ms. Allocated memory is still 156.2 MB. Free memory was 131.2 MB in the beginning and 121.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:19,474 INFO L168 Benchmark]: Boogie Preprocessor took 46.70 ms. Allocated memory is still 156.2 MB. Free memory was 121.2 MB in the beginning and 119.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:19,475 INFO L168 Benchmark]: RCFGBuilder took 756.19 ms. Allocated memory is still 156.2 MB. Free memory was 119.7 MB in the beginning and 135.4 MB in the end (delta: -15.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:19,476 INFO L168 Benchmark]: TraceAbstraction took 16706.24 ms. Allocated memory was 156.2 MB in the beginning and 278.9 MB in the end (delta: 122.7 MB). Free memory was 134.9 MB in the beginning and 224.5 MB in the end (delta: -89.5 MB). Peak memory consumption was 34.7 MB. Max. memory is 8.0 GB. [2020-11-06 22:45:19,484 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 156.2 MB. Free memory is still 130.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 289.40 ms. Allocated memory is still 156.2 MB. Free memory was 131.2 MB in the beginning and 121.2 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 46.70 ms. Allocated memory is still 156.2 MB. Free memory was 121.2 MB in the beginning and 119.7 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 756.19 ms. Allocated memory is still 156.2 MB. Free memory was 119.7 MB in the beginning and 135.4 MB in the end (delta: -15.8 MB). Peak memory consumption was 14.1 MB. Max. memory is 8.0 GB. * TraceAbstraction took 16706.24 ms. Allocated memory was 156.2 MB in the beginning and 278.9 MB in the end (delta: 122.7 MB). Free memory was 134.9 MB in the beginning and 224.5 MB in the end (delta: -89.5 MB). Peak memory consumption was 34.7 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: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={7:0}, str2={3:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={7:0}, str2={3:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str2={3:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={7:0}, str2={3:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={7:0}, str2={3:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={7:0}, str2={3:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={7:0}, str2={3:0}] [L35] COND TRUE i