/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:51:04,491 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:51:04,492 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:51:04,519 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:51:04,563 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:51:04,564 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:51:04,564 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:51:04,567 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 [2021-05-02 11:51:04,594 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:51:04,594 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:51:04,597 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:51:04,597 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:51:04,597 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:51:04,598 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:51:04,598 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:51:04,598 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:51:04,598 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:51:04,599 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:51:04,599 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:51:04,599 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:51:04,600 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:51:04,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:51:04,600 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:51:04,600 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:51:04,600 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:51:04,852 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:51:04,872 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:51:04,874 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:51:04,874 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:51:04,875 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:51:04,875 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01-1.i [2021-05-02 11:51:04,925 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/493a8b9e9/c2fb98e61e054b06904b09a7a6d729fd/FLAG5b9ccba3e [2021-05-02 11:51:05,297 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:51:05,299 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i [2021-05-02 11:51:05,303 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/493a8b9e9/c2fb98e61e054b06904b09a7a6d729fd/FLAG5b9ccba3e [2021-05-02 11:51:05,317 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/493a8b9e9/c2fb98e61e054b06904b09a7a6d729fd [2021-05-02 11:51:05,319 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:51:05,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:51:05,322 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:05,322 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:51:05,324 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:51:05,325 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,325 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f588374 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05, skipping insertion in model container [2021-05-02 11:51:05,326 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,330 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:51:05,343 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:51:05,460 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2021-05-02 11:51:05,469 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:05,474 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:51:05,506 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01-1.i[808,821] [2021-05-02 11:51:05,508 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:51:05,523 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:51:05,524 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05 WrapperNode [2021-05-02 11:51:05,524 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:51:05,528 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:51:05,528 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:51:05,528 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:51:05,535 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,539 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,539 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,550 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,553 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,554 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (1/1) ... [2021-05-02 11:51:05,556 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:51:05,557 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:51:05,557 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:51:05,557 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:51:05,558 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (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 [2021-05-02 11:51:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:51:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:51:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:51:05,620 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:51:05,621 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:51:05,621 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:51:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 11:51:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:51:05,622 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:51:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:51:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:51:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:51:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:51:05,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:51:05,827 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:51:05,827 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:51:05,828 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:05 BoogieIcfgContainer [2021-05-02 11:51:05,828 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:51:05,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:51:05,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:51:05,831 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:51:05,831 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:51:05" (1/3) ... [2021-05-02 11:51:05,831 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26db5ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:05, skipping insertion in model container [2021-05-02 11:51:05,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:51:05" (2/3) ... [2021-05-02 11:51:05,832 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26db5ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:05, skipping insertion in model container [2021-05-02 11:51:05,832 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:05" (3/3) ... [2021-05-02 11:51:05,833 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01-1.i [2021-05-02 11:51:05,836 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:51:05,851 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:51:05,886 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:51:05,911 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:51:05,911 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:51:05,911 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:51:05,911 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:51:05,911 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:51:05,911 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:51:05,911 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:51:05,911 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:51:05,945 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:51:05,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:05,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:05,948 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:05,948 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:05,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:05,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1466806487, now seen corresponding path program 1 times [2021-05-02 11:51:05,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:05,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071144377] [2021-05-02 11:51:05,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:06,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:06,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,134 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:06,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:06,136 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071144377] [2021-05-02 11:51:06,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071144377] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:06,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:06,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:51:06,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351566346] [2021-05-02 11:51:06,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:51:06,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:06,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:51:06,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:06,152 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:06,195 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 11:51:06,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:51:06,196 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 11:51:06,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:06,200 INFO L225 Difference]: With dead ends: 31 [2021-05-02 11:51:06,200 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 11:51:06,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:51:06,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 11:51:06,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 11:51:06,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 11:51:06,225 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 11:51:06,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:06,226 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 11:51:06,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,227 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 11:51:06,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:51:06,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:06,227 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:06,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:51:06,228 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:06,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:06,228 INFO L82 PathProgramCache]: Analyzing trace with hash 1456647756, now seen corresponding path program 1 times [2021-05-02 11:51:06,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:06,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577880112] [2021-05-02 11:51:06,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:06,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:06,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:06,338 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:06,338 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577880112] [2021-05-02 11:51:06,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577880112] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:06,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:06,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 11:51:06,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220136133] [2021-05-02 11:51:06,339 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:51:06,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:06,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:51:06,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:06,340 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:06,457 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 11:51:06,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:51:06,457 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 11:51:06,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:06,458 INFO L225 Difference]: With dead ends: 22 [2021-05-02 11:51:06,458 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 11:51:06,458 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 86.4ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:06,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 11:51:06,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 11:51:06,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 11:51:06,462 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 11:51:06,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:06,462 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 11:51:06,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:06,463 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 11:51:06,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 11:51:06,463 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:06,463 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:06,463 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:51:06,463 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:06,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:06,464 INFO L82 PathProgramCache]: Analyzing trace with hash 193151625, now seen corresponding path program 1 times [2021-05-02 11:51:06,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:06,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [28449286] [2021-05-02 11:51:06,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:06,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:06,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,579 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:06,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:06,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [28449286] [2021-05-02 11:51:06,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [28449286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:06,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392145897] [2021-05-02 11:51:06,580 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 [2021-05-02 11:51:06,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:06,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 11:51:06,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:06,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:06,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:06,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:06,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:06,803 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:06,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392145897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:06,803 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:06,804 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2021-05-02 11:51:06,804 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869569053] [2021-05-02 11:51:06,804 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 11:51:06,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:06,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 11:51:06,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-02 11:51:06,805 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:07,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:07,096 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2021-05-02 11:51:07,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:07,096 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 11:51:07,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:07,097 INFO L225 Difference]: With dead ends: 33 [2021-05-02 11:51:07,097 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 11:51:07,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 304.8ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-02 11:51:07,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 11:51:07,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 11:51:07,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:07,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 11:51:07,105 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 11:51:07,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:07,106 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 11:51:07,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:07,106 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 11:51:07,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:51:07,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:07,107 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:07,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 11:51:07,325 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:07,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:07,325 INFO L82 PathProgramCache]: Analyzing trace with hash 473295148, now seen corresponding path program 2 times [2021-05-02 11:51:07,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:07,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302923978] [2021-05-02 11:51:07,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:07,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:07,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:07,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:07,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:07,466 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:07,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302923978] [2021-05-02 11:51:07,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302923978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:07,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363314674] [2021-05-02 11:51:07,467 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 [2021-05-02 11:51:07,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:07,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:07,517 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 11:51:07,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:07,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:07,718 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:07,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363314674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:07,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:07,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2021-05-02 11:51:07,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514157747] [2021-05-02 11:51:07,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 11:51:07,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:07,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 11:51:07,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2021-05-02 11:51:07,720 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 19 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:08,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:08,310 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2021-05-02 11:51:08,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 11:51:08,311 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:51:08,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:08,312 INFO L225 Difference]: With dead ends: 38 [2021-05-02 11:51:08,312 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 11:51:08,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 668.7ms TimeCoverageRelationStatistics Valid=162, Invalid=894, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 11:51:08,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 11:51:08,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2021-05-02 11:51:08,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:08,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 11:51:08,320 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 17 [2021-05-02 11:51:08,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:08,321 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 11:51:08,321 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:08,321 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 11:51:08,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:51:08,321 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:08,322 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:08,536 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:08,537 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:08,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:08,537 INFO L82 PathProgramCache]: Analyzing trace with hash 2117696524, now seen corresponding path program 3 times [2021-05-02 11:51:08,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:08,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596509728] [2021-05-02 11:51:08,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:08,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:08,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:08,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:08,694 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 11:51:08,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:08,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596509728] [2021-05-02 11:51:08,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [596509728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:08,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198748164] [2021-05-02 11:51:08,694 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 [2021-05-02 11:51:08,727 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 11:51:08,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:08,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 11:51:08,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:08,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:08,963 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:08,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1198748164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:08,963 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:08,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 24 [2021-05-02 11:51:08,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133344887] [2021-05-02 11:51:08,969 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 11:51:08,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:08,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 11:51:08,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2021-05-02 11:51:08,970 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 24 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:09,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:09,854 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2021-05-02 11:51:09,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 11:51:09,854 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 11:51:09,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:09,855 INFO L225 Difference]: With dead ends: 44 [2021-05-02 11:51:09,855 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 11:51:09,856 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 916.7ms TimeCoverageRelationStatistics Valid=238, Invalid=1742, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 11:51:09,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 11:51:09,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 11:51:09,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:09,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-02 11:51:09,859 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 23 [2021-05-02 11:51:09,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:09,859 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-02 11:51:09,859 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 21 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:09,859 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-02 11:51:09,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:51:09,860 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:09,860 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:10,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:10,065 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:10,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:10,065 INFO L82 PathProgramCache]: Analyzing trace with hash 319282542, now seen corresponding path program 1 times [2021-05-02 11:51:10,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:10,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562578275] [2021-05-02 11:51:10,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:10,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:10,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:10,145 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:10,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:10,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562578275] [2021-05-02 11:51:10,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562578275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:10,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [664439051] [2021-05-02 11:51:10,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -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 [2021-05-02 11:51:10,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:10,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:51:10,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:10,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,236 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:10,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [664439051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:10,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:10,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 11:51:10,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754842084] [2021-05-02 11:51:10,236 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 11:51:10,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:10,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 11:51:10,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:51:10,237 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:10,373 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2021-05-02 11:51:10,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:51:10,374 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 11:51:10,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:10,374 INFO L225 Difference]: With dead ends: 43 [2021-05-02 11:51:10,374 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 11:51:10,375 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 126.5ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:51:10,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 11:51:10,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 11:51:10,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 11:51:10,378 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2021-05-02 11:51:10,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:10,378 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 11:51:10,378 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,378 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 11:51:10,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:51:10,378 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:10,378 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:10,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:10,593 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:10,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:10,593 INFO L82 PathProgramCache]: Analyzing trace with hash 2111093867, now seen corresponding path program 2 times [2021-05-02 11:51:10,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:10,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733537936] [2021-05-02 11:51:10,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:10,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:10,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:10,665 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:10,665 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:10,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733537936] [2021-05-02 11:51:10,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733537936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:10,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1613671052] [2021-05-02 11:51:10,665 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 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 [2021-05-02 11:51:10,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:10,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:10,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 11:51:10,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:10,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:10,766 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:10,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1613671052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:10,766 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:10,766 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 11:51:10,766 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621972642] [2021-05-02 11:51:10,766 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:51:10,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:10,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:51:10,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:51:10,767 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:10,937 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-05-02 11:51:10,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:51:10,937 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 11:51:10,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:10,938 INFO L225 Difference]: With dead ends: 46 [2021-05-02 11:51:10,938 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 11:51:10,938 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 148.0ms TimeCoverageRelationStatistics Valid=118, Invalid=188, Unknown=0, NotChecked=0, Total=306 [2021-05-02 11:51:10,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 11:51:10,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 11:51:10,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 11:51:10,942 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2021-05-02 11:51:10,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:10,942 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 11:51:10,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.0) internal successors, (33), 10 states have internal predecessors, (33), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:10,942 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 11:51:10,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 11:51:10,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:10,943 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:11,145 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 11:51:11,145 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:11,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:11,145 INFO L82 PathProgramCache]: Analyzing trace with hash -186245042, now seen corresponding path program 3 times [2021-05-02 11:51:11,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:11,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980385408] [2021-05-02 11:51:11,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:11,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:11,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:11,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:11,224 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:11,225 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:11,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980385408] [2021-05-02 11:51:11,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980385408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:11,225 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706359840] [2021-05-02 11:51:11,225 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 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 [2021-05-02 11:51:11,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-05-02 11:51:11,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:11,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 11:51:11,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:11,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,355 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:11,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706359840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:11,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:11,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 11:51:11,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850013779] [2021-05-02 11:51:11,357 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 11:51:11,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:11,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 11:51:11,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:51:11,357 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:11,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:11,532 INFO L93 Difference]: Finished difference Result 49 states and 53 transitions. [2021-05-02 11:51:11,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:51:11,532 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 11:51:11,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:11,533 INFO L225 Difference]: With dead ends: 49 [2021-05-02 11:51:11,533 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 11:51:11,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 156.9ms TimeCoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2021-05-02 11:51:11,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 11:51:11,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 11:51:11,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:11,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 11:51:11,537 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-05-02 11:51:11,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:11,537 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 11:51:11,537 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 11 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:11,537 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 11:51:11,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 11:51:11,538 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:11,538 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:11,754 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:11,755 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:11,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:11,755 INFO L82 PathProgramCache]: Analyzing trace with hash 94178699, now seen corresponding path program 4 times [2021-05-02 11:51:11,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:11,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591690926] [2021-05-02 11:51:11,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:11,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:11,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:11,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:11,833 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:11,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:11,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591690926] [2021-05-02 11:51:11,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591690926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:11,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557386213] [2021-05-02 11:51:11,833 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 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 [2021-05-02 11:51:11,872 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:51:11,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:11,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 11:51:11,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:11,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:11,935 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 17 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:51:11,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557386213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:11,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:11,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 11:51:11,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000587147] [2021-05-02 11:51:11,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 11:51:11,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:11,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 11:51:11,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2021-05-02 11:51:11,937 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:12,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:12,150 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 11:51:12,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 11:51:12,151 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 11:51:12,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:12,151 INFO L225 Difference]: With dead ends: 52 [2021-05-02 11:51:12,151 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 11:51:12,151 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 181.0ms TimeCoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2021-05-02 11:51:12,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 11:51:12,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 11:51:12,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:12,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 11:51:12,155 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-05-02 11:51:12,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:12,155 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 11:51:12,155 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.0) internal successors, (39), 12 states have internal predecessors, (39), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:51:12,155 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 11:51:12,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 11:51:12,155 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:12,156 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:12,368 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 11:51:12,369 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:12,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:12,369 INFO L82 PathProgramCache]: Analyzing trace with hash 486456110, now seen corresponding path program 5 times [2021-05-02 11:51:12,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:12,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841933526] [2021-05-02 11:51:12,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:12,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:12,380 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:12,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:12,389 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:12,409 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:51:12,409 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:51:12,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-02 11:51:12,429 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:51:12 BoogieIcfgContainer [2021-05-02 11:51:12,429 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:51:12,430 INFO L168 Benchmark]: Toolchain (without parser) took 7109.26 ms. Allocated memory was 197.1 MB in the beginning and 297.8 MB in the end (delta: 100.7 MB). Free memory was 162.1 MB in the beginning and 276.4 MB in the end (delta: -114.3 MB). Peak memory consumption was 156.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 197.1 MB. Free memory is still 178.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L168 Benchmark]: CACSL2BoogieTranslator took 202.46 ms. Allocated memory is still 197.1 MB. Free memory was 161.9 MB in the beginning and 180.6 MB in the end (delta: -18.7 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L168 Benchmark]: Boogie Preprocessor took 28.18 ms. Allocated memory is still 197.1 MB. Free memory was 180.6 MB in the beginning and 179.0 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L168 Benchmark]: RCFGBuilder took 271.04 ms. Allocated memory is still 197.1 MB. Free memory was 179.0 MB in the beginning and 165.4 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L168 Benchmark]: TraceAbstraction took 6600.07 ms. Allocated memory was 197.1 MB in the beginning and 297.8 MB in the end (delta: 100.7 MB). Free memory was 164.9 MB in the beginning and 276.4 MB in the end (delta: -111.5 MB). Peak memory consumption was 159.5 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:12,430 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 197.1 MB. Free memory is still 178.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 202.46 ms. Allocated memory is still 197.1 MB. Free memory was 161.9 MB in the beginning and 180.6 MB in the end (delta: -18.7 MB). Peak memory consumption was 11.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 28.18 ms. Allocated memory is still 197.1 MB. Free memory was 180.6 MB in the beginning and 179.0 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 271.04 ms. Allocated memory is still 197.1 MB. Free memory was 179.0 MB in the beginning and 165.4 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6600.07 ms. Allocated memory was 197.1 MB in the beginning and 297.8 MB in the end (delta: 100.7 MB). Free memory was 164.9 MB in the beginning and 276.4 MB in the end (delta: -111.5 MB). Peak memory consumption was 159.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; [L24] i=1 VAL [i=1, n=10, n=0] [L24] COND TRUE i<=n VAL [i=1, n=0, n=10] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=1, n=10, n=2] [L24] i++ VAL [i=2, n=10, n=2] [L24] COND TRUE i<=n VAL [i=2, n=10, n=2] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=2, n=4, n=10] [L24] i++ VAL [i=3, n=10, n=4] [L24] COND TRUE i<=n VAL [i=3, n=10, n=4] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=3, n=10, n=6] [L24] i++ VAL [i=4, n=6, n=10] [L24] COND TRUE i<=n VAL [i=4, n=6, n=10] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=4, n=8, n=10] [L24] i++ VAL [i=5, n=10, n=8] [L24] COND TRUE i<=n VAL [i=5, n=10, n=8] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=5, n=10, n=10] [L24] i++ VAL [i=6, n=10, n=10] [L24] COND TRUE i<=n VAL [i=6, n=10, n=10] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=6, n=10, n=12] [L24] i++ VAL [i=7, n=10, n=12] [L24] COND TRUE i<=n VAL [i=7, n=12, n=10] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=7, n=10, n=14] [L24] i++ VAL [i=8, n=14, n=10] [L24] COND TRUE i<=n VAL [i=8, n=14, n=10] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=8, n=10, n=16] [L24] i++ VAL [i=9, n=16, n=10] [L24] COND TRUE i<=n VAL [i=9, n=10, n=16] [L25] COND TRUE i<10 [L26] sn = sn + (2) VAL [i=9, n=18, n=10] [L24] i++ VAL [i=10, n=18, n=10] [L24] COND TRUE i<=n VAL [i=10, n=10, n=18] [L25] COND FALSE !(i<10) VAL [i=10, n=10, n=18] [L24] i++ VAL [i=11, n=10, n=18] [L24] COND FALSE !(i<=n) VAL [i=11, n=10, n=18] [L28] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) VAL [\old(cond)=0] [L15] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L16] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6500.9ms, OverallIterations: 10, TraceHistogramMax: 10, EmptinessCheckTime: 33.2ms, AutomataDifference: 2654.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 6.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 99 SDtfs, 238 SDslu, 314 SDs, 0 SdLazy, 903 SolverSat, 112 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 508.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 354 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 997 ImplicationChecksByTransitivity, 2627.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=43occurred in iteration=9, InterpolantAutomatonStates: 102, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 47.8ms AutomataMinimizationTime, 9 MinimizatonAttempts, 7 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 58.4ms SsaConstructionTime, 202.2ms SatisfiabilityAnalysisTime, 1721.2ms InterpolantComputationTime, 439 NumberOfCodeBlocks, 439 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 382 ConstructedInterpolants, 0 QuantifiedInterpolants, 1590 SizeOfPredicates, 6 NumberOfNonLiveVariables, 739 ConjunctsInSsa, 95 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 117/716 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...