/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/nla-digbench-scaling/hard-u_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:30:21,358 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:30:21,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:30:21,398 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:30:21,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:30:21,421 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:30:21,422 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:30:21,423 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:30:21,426 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:30:21,428 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:30:21,430 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:30:21,435 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:30:21,436 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:30:21,437 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:30:21,438 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:30:21,440 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:30:21,446 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:30:21,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:30:21,458 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:30:21,468 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:30:21,472 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 15:30:21,507 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:30:21,507 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:30:21,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:30:21,510 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:30:21,510 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:30:21,510 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:30:21,511 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:30:21,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:30:21,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:30:21,511 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:30:21,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:30:21,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:30:21,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:30:21,513 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:30:21,513 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:30:21,513 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:30:21,513 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:30:21,513 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:30:21,513 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:30:21,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:30:21,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:30:21,514 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:30:21,514 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:30:21,514 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:30:21,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:30:21,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:30:21,515 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:30:21,515 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:30:21,515 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:30:21,842 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:30:21,868 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:30:21,870 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:30:21,871 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:30:21,872 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:30:21,873 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2021-05-02 15:30:21,927 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef25063c5/5961c3a255d543b5927c725d17b4aa8e/FLAG81cdcf00c [2021-05-02 15:30:22,368 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:30:22,369 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2021-05-02 15:30:22,375 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef25063c5/5961c3a255d543b5927c725d17b4aa8e/FLAG81cdcf00c [2021-05-02 15:30:22,775 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ef25063c5/5961c3a255d543b5927c725d17b4aa8e [2021-05-02 15:30:22,777 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:30:22,778 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:30:22,780 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:22,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:30:22,784 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:30:22,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:22,788 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@547808e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22, skipping insertion in model container [2021-05-02 15:30:22,788 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:22,794 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:30:22,808 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:30:22,906 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c[545,558] [2021-05-02 15:30:22,920 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:22,937 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:30:22,950 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c[545,558] [2021-05-02 15:30:22,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:30:22,980 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:30:22,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22 WrapperNode [2021-05-02 15:30:22,981 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:30:22,983 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:30:22,983 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:30:22,994 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:30:23,019 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,019 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,031 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,031 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,042 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,048 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,055 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (1/1) ... [2021-05-02 15:30:23,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:30:23,057 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:30:23,057 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:30:23,057 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:30:23,060 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (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 15:30:23,134 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:30:23,134 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:30:23,135 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:30:23,135 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:30:23,135 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:30:23,135 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:30:23,135 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:30:23,135 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:30:23,136 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:30:23,136 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:30:23,136 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 15:30:23,136 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:30:23,137 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:30:23,137 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:30:23,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:30:23,386 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:30:23,386 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 15:30:23,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:23 BoogieIcfgContainer [2021-05-02 15:30:23,388 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:30:23,389 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:30:23,389 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:30:23,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:30:23,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:30:22" (1/3) ... [2021-05-02 15:30:23,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54924e2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:23, skipping insertion in model container [2021-05-02 15:30:23,392 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:30:22" (2/3) ... [2021-05-02 15:30:23,393 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54924e2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:30:23, skipping insertion in model container [2021-05-02 15:30:23,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:30:23" (3/3) ... [2021-05-02 15:30:23,394 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound100.c [2021-05-02 15:30:23,399 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:30:23,402 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:30:23,432 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:30:23,461 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:30:23,461 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:30:23,461 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:30:23,468 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:30:23,469 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:30:23,469 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:30:23,469 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:30:23,469 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:30:23,487 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 15:30:23,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:23,505 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:23,506 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:23,506 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:23,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:23,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2021-05-02 15:30:23,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:23,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2109828809] [2021-05-02 15:30:23,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:23,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:23,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:23,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:23,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:23,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:23,716 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 15:30:23,716 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:23,717 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2109828809] [2021-05-02 15:30:23,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2109828809] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:23,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:23,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:30:23,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678864858] [2021-05-02 15:30:23,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:30:23,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:23,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:30:23,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:23,737 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:23,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:23,925 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2021-05-02 15:30:23,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:30:23,927 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:23,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:23,933 INFO L225 Difference]: With dead ends: 66 [2021-05-02 15:30:23,933 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 15:30:23,936 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:30:23,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 15:30:23,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 15:30:23,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:23,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 15:30:23,984 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-02 15:30:23,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:23,984 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 15:30:23,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:23,985 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 15:30:23,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:30:23,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:23,986 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:23,987 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:30:23,987 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:23,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:23,988 INFO L82 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2021-05-02 15:30:23,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:23,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219387593] [2021-05-02 15:30:23,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:24,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:24,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:24,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:24,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:24,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:24,204 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 15:30:24,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:24,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219387593] [2021-05-02 15:30:24,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219387593] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:24,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:24,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:24,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475990491] [2021-05-02 15:30:24,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:24,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:24,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:24,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:24,207 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:24,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:24,567 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-02 15:30:24,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:24,568 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:30:24,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:24,570 INFO L225 Difference]: With dead ends: 47 [2021-05-02 15:30:24,570 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:30:24,572 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 175.6ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:24,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:30:24,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-02 15:30:24,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:24,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 15:30:24,588 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-02 15:30:24,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:24,588 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 15:30:24,588 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:30:24,588 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 15:30:24,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 15:30:24,589 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:24,589 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:24,589 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 15:30:24,589 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:24,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:24,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2021-05-02 15:30:24,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:24,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295961908] [2021-05-02 15:30:24,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:24,602 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:24,602 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2075514461] [2021-05-02 15:30:24,602 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 15:30:24,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:24,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:30:24,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:24,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:24,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:24,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:24,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:24,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:24,766 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 15:30:24,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:24,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295961908] [2021-05-02 15:30:24,766 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:24,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075514461] [2021-05-02 15:30:24,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075514461] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:24,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:24,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:30:24,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691269277] [2021-05-02 15:30:24,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:30:24,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:24,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:30:24,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:24,768 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:24,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:24,783 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2021-05-02 15:30:24,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:30:24,783 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 15:30:24,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:24,784 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:24,784 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 15:30:24,785 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.0ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:30:24,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 15:30:24,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 15:30:24,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:24,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-02 15:30:24,792 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-02 15:30:24,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:24,792 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-02 15:30:24,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:30:24,792 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-02 15:30:24,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:30:24,793 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:24,793 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:25,017 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 15:30:25,017 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:25,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:25,018 INFO L82 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2021-05-02 15:30:25,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:25,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105753351] [2021-05-02 15:30:25,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:25,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:25,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:30:25,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:25,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:30:25,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:25,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-02 15:30:25,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:25,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:30:25,177 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:25,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105753351] [2021-05-02 15:30:25,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105753351] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:25,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:25,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:30:25,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712041595] [2021-05-02 15:30:25,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:25,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:25,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:25,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:25,179 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:25,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:25,455 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2021-05-02 15:30:25,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:25,456 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:30:25,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:25,459 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:30:25,459 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 15:30:25,460 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 156.3ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:25,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 15:30:25,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-02 15:30:25,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:30:25,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 15:30:25,476 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-02 15:30:25,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:25,476 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 15:30:25,477 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:30:25,477 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 15:30:25,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 15:30:25,478 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:25,479 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:25,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 15:30:25,479 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:25,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:25,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2021-05-02 15:30:25,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:25,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153539993] [2021-05-02 15:30:25,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:25,505 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:25,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1125249898] [2021-05-02 15:30:25,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -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 15:30:25,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:25,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:30:25,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:25,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:30:25,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:25,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153539993] [2021-05-02 15:30:25,818 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:25,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125249898] [2021-05-02 15:30:25,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125249898] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:25,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:25,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 15:30:25,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252823664] [2021-05-02 15:30:25,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:30:25,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:25,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:30:25,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:25,820 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:25,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:25,959 INFO L93 Difference]: Finished difference Result 71 states and 93 transitions. [2021-05-02 15:30:25,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:25,960 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-02 15:30:25,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:25,969 INFO L225 Difference]: With dead ends: 71 [2021-05-02 15:30:25,969 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 15:30:25,970 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 86.6ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:30:25,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 15:30:25,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 15:30:25,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2424242424242424) internal successors, (41), 35 states have internal predecessors, (41), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:30:25,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2021-05-02 15:30:25,984 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 28 [2021-05-02 15:30:25,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:25,984 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2021-05-02 15:30:25,984 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:30:25,985 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2021-05-02 15:30:25,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:30:25,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:25,985 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:26,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:26,209 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:26,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:26,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2021-05-02 15:30:26,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:26,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827196573] [2021-05-02 15:30:26,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:26,219 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:26,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1680748088] [2021-05-02 15:30:26,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -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 15:30:26,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:26,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:30:26,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:26,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,401 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:26,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:26,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827196573] [2021-05-02 15:30:26,401 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:26,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1680748088] [2021-05-02 15:30:26,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1680748088] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:26,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:26,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 15:30:26,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400669086] [2021-05-02 15:30:26,402 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:30:26,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:26,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:30:26,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:26,403 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:26,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:26,436 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-05-02 15:30:26,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:30:26,437 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 15:30:26,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:26,437 INFO L225 Difference]: With dead ends: 76 [2021-05-02 15:30:26,437 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 15:30:26,438 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:26,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 15:30:26,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 15:30:26,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 44 states have internal predecessors, (49), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:30:26,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-05-02 15:30:26,445 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 36 [2021-05-02 15:30:26,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:26,446 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-05-02 15:30:26,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:26,446 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-05-02 15:30:26,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:30:26,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:26,447 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:26,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:26,669 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:26,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:26,669 INFO L82 PathProgramCache]: Analyzing trace with hash 1303085071, now seen corresponding path program 1 times [2021-05-02 15:30:26,669 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:26,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973857903] [2021-05-02 15:30:26,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:26,679 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:26,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1682989147] [2021-05-02 15:30:26,680 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 15:30:26,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:26,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:26,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:26,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,806 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:26,917 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:26,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:26,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973857903] [2021-05-02 15:30:26,918 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:26,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1682989147] [2021-05-02 15:30:26,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1682989147] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:30:26,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:30:26,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 15:30:26,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755353914] [2021-05-02 15:30:26,919 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:26,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:26,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:26,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:26,920 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:27,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:27,092 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2021-05-02 15:30:27,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:27,093 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 15:30:27,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:27,097 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:30:27,097 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 15:30:27,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 97.2ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:30:27,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 15:30:27,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 15:30:27,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:30:27,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 15:30:27,116 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 36 [2021-05-02 15:30:27,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:27,117 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 15:30:27,117 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:30:27,117 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 15:30:27,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 15:30:27,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:27,124 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:27,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:27,347 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:27,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:27,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1189074514, now seen corresponding path program 1 times [2021-05-02 15:30:27,348 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:27,348 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929495142] [2021-05-02 15:30:27,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:27,359 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:27,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1691569719] [2021-05-02 15:30:27,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:27,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:27,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:30:27,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:27,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:27,635 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:30:27,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:27,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929495142] [2021-05-02 15:30:27,636 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:27,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691569719] [2021-05-02 15:30:27,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691569719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:27,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:27,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:30:27,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903878071] [2021-05-02 15:30:27,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:30:27,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:27,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:30:27,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:30:27,637 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:27,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:27,686 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2021-05-02 15:30:27,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:30:27,687 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-05-02 15:30:27,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:27,688 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:30:27,688 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 15:30:27,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 17.2ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:27,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 15:30:27,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 15:30:27,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:30:27,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-02 15:30:27,695 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 38 [2021-05-02 15:30:27,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:27,695 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-02 15:30:27,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:30:27,695 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-02 15:30:27,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 15:30:27,696 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:27,696 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:27,914 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:27,915 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:27,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:27,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890039, now seen corresponding path program 1 times [2021-05-02 15:30:27,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:27,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1590178271] [2021-05-02 15:30:27,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:27,922 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:27,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1156903589] [2021-05-02 15:30:27,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -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 15:30:28,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:28,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:30:28,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:28,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,301 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 15:30:28,302 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:28,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1590178271] [2021-05-02 15:30:28,302 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:28,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1156903589] [2021-05-02 15:30:28,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1156903589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:28,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:28,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:30:28,302 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262968243] [2021-05-02 15:30:28,303 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:28,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:28,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:28,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:28,305 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:30:28,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:28,506 INFO L93 Difference]: Finished difference Result 83 states and 100 transitions. [2021-05-02 15:30:28,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:28,507 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-02 15:30:28,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:28,508 INFO L225 Difference]: With dead ends: 83 [2021-05-02 15:30:28,508 INFO L226 Difference]: Without dead ends: 75 [2021-05-02 15:30:28,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 53.0ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:30:28,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-05-02 15:30:28,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 73. [2021-05-02 15:30:28,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 45 states have (on average 1.1777777777777778) internal successors, (53), 46 states have internal predecessors, (53), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:30:28,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2021-05-02 15:30:28,515 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 46 [2021-05-02 15:30:28,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:28,515 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2021-05-02 15:30:28,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 4 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 15:30:28,516 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2021-05-02 15:30:28,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:30:28,520 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:28,521 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:28,723 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:28,724 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:28,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:28,724 INFO L82 PathProgramCache]: Analyzing trace with hash 243046571, now seen corresponding path program 1 times [2021-05-02 15:30:28,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:28,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902986932] [2021-05-02 15:30:28,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:28,731 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:28,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [639261232] [2021-05-02 15:30:28,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -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 15:30:28,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:28,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:30:28,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:28,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:28,933 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 15:30:28,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:28,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902986932] [2021-05-02 15:30:28,933 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:28,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639261232] [2021-05-02 15:30:28,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639261232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:28,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:28,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:30:28,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514310524] [2021-05-02 15:30:28,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:28,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:28,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:28,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:28,935 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:30:28,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:28,983 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2021-05-02 15:30:28,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:30:28,983 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 54 [2021-05-02 15:30:28,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:28,986 INFO L225 Difference]: With dead ends: 94 [2021-05-02 15:30:28,986 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 15:30:28,988 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 12.8ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:28,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 15:30:29,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 15:30:29,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 54 states have (on average 1.1296296296296295) internal successors, (61), 55 states have internal predecessors, (61), 18 states have call successors, (18), 13 states have call predecessors, (18), 12 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:30:29,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 95 transitions. [2021-05-02 15:30:29,006 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 95 transitions. Word has length 54 [2021-05-02 15:30:29,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:29,006 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 95 transitions. [2021-05-02 15:30:29,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:30:29,006 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 95 transitions. [2021-05-02 15:30:29,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:30:29,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:29,008 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:29,229 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 15:30:29,229 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:29,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:29,230 INFO L82 PathProgramCache]: Analyzing trace with hash 244774449, now seen corresponding path program 1 times [2021-05-02 15:30:29,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:29,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367335571] [2021-05-02 15:30:29,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:29,237 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:29,237 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [818301254] [2021-05-02 15:30:29,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:29,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:29,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:30:29,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:29,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:29,557 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 15:30:29,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:29,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367335571] [2021-05-02 15:30:29,558 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:29,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818301254] [2021-05-02 15:30:29,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818301254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:29,558 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:29,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:30:29,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333757499] [2021-05-02 15:30:29,559 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:30:29,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:29,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:30:29,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:30:29,560 INFO L87 Difference]: Start difference. First operand 85 states and 95 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:30:29,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:29,699 INFO L93 Difference]: Finished difference Result 99 states and 114 transitions. [2021-05-02 15:30:29,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:30:29,699 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2021-05-02 15:30:29,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:29,703 INFO L225 Difference]: With dead ends: 99 [2021-05-02 15:30:29,703 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 15:30:29,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 55.4ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:30:29,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 15:30:29,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 96. [2021-05-02 15:30:29,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 63 states have internal predecessors, (71), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:30:29,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 111 transitions. [2021-05-02 15:30:29,712 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 111 transitions. Word has length 54 [2021-05-02 15:30:29,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:29,712 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 111 transitions. [2021-05-02 15:30:29,713 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:30:29,713 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 111 transitions. [2021-05-02 15:30:29,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 15:30:29,713 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:29,715 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:29,918 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:30:29,918 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:29,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:29,918 INFO L82 PathProgramCache]: Analyzing trace with hash 940283669, now seen corresponding path program 1 times [2021-05-02 15:30:29,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:29,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488235763] [2021-05-02 15:30:29,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:29,926 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:29,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1295351869] [2021-05-02 15:30:29,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:29,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:30,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:30:30,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:30,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,130 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 15:30:30,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:30,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488235763] [2021-05-02 15:30:30,131 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:30,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295351869] [2021-05-02 15:30:30,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295351869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:30,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:30,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:30:30,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608047019] [2021-05-02 15:30:30,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:30:30,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:30,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:30:30,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:30:30,133 INFO L87 Difference]: Start difference. First operand 96 states and 111 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:30:30,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:30,186 INFO L93 Difference]: Finished difference Result 123 states and 149 transitions. [2021-05-02 15:30:30,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:30,186 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 61 [2021-05-02 15:30:30,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:30,188 INFO L225 Difference]: With dead ends: 123 [2021-05-02 15:30:30,188 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 15:30:30,189 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 26.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:30,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 15:30:30,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-02 15:30:30,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 63 states have (on average 1.1587301587301588) internal successors, (73), 65 states have internal predecessors, (73), 21 states have call successors, (21), 14 states have call predecessors, (21), 13 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:30:30,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2021-05-02 15:30:30,196 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 61 [2021-05-02 15:30:30,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:30,196 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2021-05-02 15:30:30,196 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:30:30,196 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2021-05-02 15:30:30,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 15:30:30,197 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:30,197 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:30,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:30,413 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:30,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:30,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1995039641, now seen corresponding path program 2 times [2021-05-02 15:30:30,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:30,414 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33718687] [2021-05-02 15:30:30,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:30,424 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:30,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1877352460] [2021-05-02 15:30:30,424 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:30,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:30:30,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:30:30,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 15:30:30,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:30,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:30,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,068 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 43 proven. 34 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 15:30:31,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:31,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33718687] [2021-05-02 15:30:31,069 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:31,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877352460] [2021-05-02 15:30:31,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877352460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:31,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:31,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:30:31,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608573870] [2021-05-02 15:30:31,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:30:31,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:31,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:30:31,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:30:31,071 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:30:31,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:31,632 INFO L93 Difference]: Finished difference Result 125 states and 148 transitions. [2021-05-02 15:30:31,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:30:31,633 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 64 [2021-05-02 15:30:31,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:31,634 INFO L225 Difference]: With dead ends: 125 [2021-05-02 15:30:31,634 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 15:30:31,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 120.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:30:31,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 15:30:31,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 110. [2021-05-02 15:30:31,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 69 states have (on average 1.173913043478261) internal successors, (81), 72 states have internal predecessors, (81), 26 states have call successors, (26), 15 states have call predecessors, (26), 14 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:30:31,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 131 transitions. [2021-05-02 15:30:31,645 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 131 transitions. Word has length 64 [2021-05-02 15:30:31,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:31,646 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 131 transitions. [2021-05-02 15:30:31,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 10 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:30:31,647 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 131 transitions. [2021-05-02 15:30:31,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:30:31,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:31,647 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:31,851 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:31,852 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:31,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:31,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1140868055, now seen corresponding path program 1 times [2021-05-02 15:30:31,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:31,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635006804] [2021-05-02 15:30:31,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:31,859 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:31,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [284428891] [2021-05-02 15:30:31,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:31,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:31,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:30:31,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:31,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:31,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,038 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,084 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:30:32,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:30:32,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635006804] [2021-05-02 15:30:32,085 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:30:32,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [284428891] [2021-05-02 15:30:32,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [284428891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:30:32,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:30:32,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:30:32,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1866221421] [2021-05-02 15:30:32,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:30:32,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:30:32,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:30:32,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:30:32,086 INFO L87 Difference]: Start difference. First operand 110 states and 131 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:30:32,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:30:32,167 INFO L93 Difference]: Finished difference Result 146 states and 166 transitions. [2021-05-02 15:30:32,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:30:32,168 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 68 [2021-05-02 15:30:32,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:30:32,169 INFO L225 Difference]: With dead ends: 146 [2021-05-02 15:30:32,169 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 15:30:32,170 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 26.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:30:32,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 15:30:32,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 132. [2021-05-02 15:30:32,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 87 states have (on average 1.1379310344827587) internal successors, (99), 89 states have internal predecessors, (99), 26 states have call successors, (26), 19 states have call predecessors, (26), 18 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:30:32,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 149 transitions. [2021-05-02 15:30:32,179 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 149 transitions. Word has length 68 [2021-05-02 15:30:32,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:30:32,179 INFO L480 AbstractCegarLoop]: Abstraction has 132 states and 149 transitions. [2021-05-02 15:30:32,179 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:30:32,180 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 149 transitions. [2021-05-02 15:30:32,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:30:32,180 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:30:32,180 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:30:32,402 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 15:30:32,402 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:30:32,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:30:32,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1142595933, now seen corresponding path program 1 times [2021-05-02 15:30:32,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:30:32,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15507845] [2021-05-02 15:30:32,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:30:32,410 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:30:32,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1430654486] [2021-05-02 15:30:32,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:30:32,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:30:32,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 15:30:32,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:30:32,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:32,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,532 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,539 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,602 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:30:33,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:40:36,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:40:36,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15507845] [2021-05-02 15:40:36,186 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:40:36,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430654486] [2021-05-02 15:40:36,186 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: -1072721305 [2021-05-02 15:40:36,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:40:36,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-05-02 15:40:36,186 ERROR L212 FreeRefinementEngine]: Strategy CAMEL failed to provide any proof altough trace is infeasible [2021-05-02 15:40:36,186 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 15:40:36,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:40:36,402 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-02 15:40:36,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 03:40:36 BoogieIcfgContainer [2021-05-02 15:40:36,403 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 15:40:36,403 INFO L168 Benchmark]: Toolchain (without parser) took 613625.08 ms. Allocated memory was 177.2 MB in the beginning and 7.2 GB in the end (delta: 7.0 GB). Free memory was 141.8 MB in the beginning and 5.9 GB in the end (delta: -5.7 GB). Peak memory consumption was 5.5 GB. Max. memory is 8.0 GB. [2021-05-02 15:40:36,403 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 177.2 MB. Free memory is still 158.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 15:40:36,403 INFO L168 Benchmark]: CACSL2BoogieTranslator took 200.84 ms. Allocated memory is still 177.2 MB. Free memory was 141.6 MB in the beginning and 131.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:36,404 INFO L168 Benchmark]: Boogie Preprocessor took 73.28 ms. Allocated memory is still 177.2 MB. Free memory was 131.8 MB in the beginning and 160.5 MB in the end (delta: -28.8 MB). Peak memory consumption was 2.6 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:36,404 INFO L168 Benchmark]: RCFGBuilder took 330.54 ms. Allocated memory is still 177.2 MB. Free memory was 160.5 MB in the beginning and 143.8 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 15:40:36,404 INFO L168 Benchmark]: TraceAbstraction took 613013.76 ms. Allocated memory was 177.2 MB in the beginning and 7.2 GB in the end (delta: 7.0 GB). Free memory was 143.2 MB in the beginning and 5.9 GB in the end (delta: -5.7 GB). Peak memory consumption was 5.5 GB. Max. memory is 8.0 GB. [2021-05-02 15:40:36,404 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 177.2 MB. Free memory is still 158.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 200.84 ms. Allocated memory is still 177.2 MB. Free memory was 141.6 MB in the beginning and 131.8 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 73.28 ms. Allocated memory is still 177.2 MB. Free memory was 131.8 MB in the beginning and 160.5 MB in the end (delta: -28.8 MB). Peak memory consumption was 2.6 MB. Max. memory is 8.0 GB. * RCFGBuilder took 330.54 ms. Allocated memory is still 177.2 MB. Free memory was 160.5 MB in the beginning and 143.8 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 613013.76 ms. Allocated memory was 177.2 MB in the beginning and 7.2 GB in the end (delta: 7.0 GB). Free memory was 143.2 MB in the beginning and 5.9 GB in the end (delta: -5.7 GB). Peak memory consumption was 5.5 GB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 17]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L22] int counter = 0; [L24] unsigned int A, B; [L25] unsigned int r, d, p, q; [L26] A = __VERIFIER_nondet_unsigned_int() [L27] B = __VERIFIER_nondet_unsigned_int() [L28] CALL assume_abort_if_not(B >= 1) [L12] COND FALSE !(!cond) [L28] RET assume_abort_if_not(B >= 1) [L30] r = A [L31] d = B [L32] p = 1 [L33] q = 0 [L35] EXPR counter++ [L35] COND TRUE counter++<100 [L36] CALL __VERIFIER_assert(q == 0) [L15] COND FALSE !(!(cond)) [L36] RET __VERIFIER_assert(q == 0) [L37] CALL __VERIFIER_assert(r == A) [L15] COND FALSE !(!(cond)) [L37] RET __VERIFIER_assert(r == A) [L38] CALL __VERIFIER_assert(d == B * p) [L15] COND FALSE !(!(cond)) [L38] RET __VERIFIER_assert(d == B * p) [L39] COND FALSE !(!(r >= d)) [L41] d = 2 * d [L42] p = 2 * p [L35] EXPR counter++ [L35] COND TRUE counter++<100 [L36] CALL __VERIFIER_assert(q == 0) [L15] COND FALSE !(!(cond)) [L36] RET __VERIFIER_assert(q == 0) [L37] CALL __VERIFIER_assert(r == A) [L15] COND FALSE !(!(cond)) [L37] RET __VERIFIER_assert(r == A) [L38] CALL __VERIFIER_assert(d == B * p) [L15] COND FALSE !(!(cond)) [L38] RET __VERIFIER_assert(d == B * p) [L39] COND TRUE !(r >= d) [L45] EXPR counter++ [L45] COND TRUE counter++<100 [L46] CALL __VERIFIER_assert(A == q*B + r) [L15] COND FALSE !(!(cond)) [L46] RET __VERIFIER_assert(A == q*B + r) [L47] CALL __VERIFIER_assert(d == B*p) [L15] COND FALSE !(!(cond)) [L47] RET __VERIFIER_assert(d == B*p) [L49] COND FALSE !(!(p != 1)) [L51] d = d / 2 [L52] p = p / 2 [L53] COND TRUE r >= d [L54] r = r - d [L55] q = q + p [L45] EXPR counter++ [L45] COND TRUE counter++<100 [L46] CALL __VERIFIER_assert(A == q*B + r) [L15] COND TRUE !(cond) [L17] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 612931.0ms, OverallIterations: 15, TraceHistogramMax: 9, EmptinessCheckTime: 46.0ms, AutomataDifference: 2398.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 596 SDtfs, 273 SDslu, 1877 SDs, 0 SdLazy, 1069 SolverSat, 148 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1397.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 545 GetRequests, 452 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 896.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=132occurred in iteration=14, InterpolantAutomatonStates: 103, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 177.4ms AutomataMinimizationTime, 14 MinimizatonAttempts, 27 StatesRemovedByMinimization, 9 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 139.4ms SsaConstructionTime, 828.4ms SatisfiabilityAnalysisTime, 2295.9ms InterpolantComputationTime, 564 NumberOfCodeBlocks, 564 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 550 ConstructedInterpolants, 0 QuantifiedInterpolants, 2003 SizeOfPredicates, 30 NumberOfNonLiveVariables, 1852 ConjunctsInSsa, 158 ConjunctsInUnsatCore, 14 InterpolantComputations, 7 PerfectInterpolantSequences, 438/665 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 could not prove your program: unable to determine feasibility of some traces Received shutdown request...