/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/ps5-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 04:50:12,231 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 04:50:12,232 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 04:50:12,253 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 04:50:12,264 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 04:50:12,265 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 04:50:12,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 04:50:12,266 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 04:50:12,267 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 04:50:12,268 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 04:50:12,269 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 04:50:12,271 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 04:50:12,272 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 04:50:12,283 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 04:50:12,287 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 04:50:12,287 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 04:50:12,290 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 04:50:12,309 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 04:50:12,310 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 04:50:12,313 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 04:50:12,315 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 [2021-05-06 04:50:12,351 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 04:50:12,351 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 04:50:12,354 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 04:50:12,355 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 04:50:12,355 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 04:50:12,356 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 04:50:12,356 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 04:50:12,357 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 04:50:12,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 04:50:12,358 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 04:50:12,358 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 04:50:12,358 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 04:50:12,627 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 04:50:12,655 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 04:50:12,657 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 04:50:12,658 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 04:50:12,659 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 04:50:12,660 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-05-06 04:50:12,715 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18c86f85/1a2a45787be24256a1a2ef3a13e92631/FLAG1096bb14a [2021-05-06 04:50:13,096 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 04:50:13,097 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps5-ll_unwindbound50.c [2021-05-06 04:50:13,103 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18c86f85/1a2a45787be24256a1a2ef3a13e92631/FLAG1096bb14a [2021-05-06 04:50:13,120 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a18c86f85/1a2a45787be24256a1a2ef3a13e92631 [2021-05-06 04:50:13,123 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 04:50:13,125 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 04:50:13,128 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 04:50:13,128 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 04:50:13,131 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 04:50:13,132 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,133 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@721ea0d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13, skipping insertion in model container [2021-05-06 04:50:13,133 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,139 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 04:50:13,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 04:50:13,292 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/ps5-ll_unwindbound50.c[458,471] [2021-05-06 04:50:13,312 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:50:13,321 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 04:50:13,331 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/ps5-ll_unwindbound50.c[458,471] [2021-05-06 04:50:13,349 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 04:50:13,363 INFO L208 MainTranslator]: Completed translation [2021-05-06 04:50:13,363 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13 WrapperNode [2021-05-06 04:50:13,363 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 04:50:13,366 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 04:50:13,366 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 04:50:13,367 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 04:50:13,409 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,410 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,424 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,424 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,435 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,440 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,442 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (1/1) ... [2021-05-06 04:50:13,446 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 04:50:13,447 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 04:50:13,448 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 04:50:13,448 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 04:50:13,448 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (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 [2021-05-06 04:50:13,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 04:50:13,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 04:50:13,518 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 04:50:13,518 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 04:50:13,519 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 04:50:13,519 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 04:50:13,519 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 04:50:13,519 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 04:50:13,520 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 04:50:13,520 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 04:50:13,520 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-06 04:50:13,520 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 04:50:13,521 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 04:50:13,522 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 04:50:13,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 04:50:13,754 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 04:50:13,754 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 04:50:13,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:50:13 BoogieIcfgContainer [2021-05-06 04:50:13,756 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 04:50:13,757 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 04:50:13,757 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 04:50:13,759 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 04:50:13,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 04:50:13" (1/3) ... [2021-05-06 04:50:13,760 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ee72470 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:50:13, skipping insertion in model container [2021-05-06 04:50:13,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 04:50:13" (2/3) ... [2021-05-06 04:50:13,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ee72470 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 04:50:13, skipping insertion in model container [2021-05-06 04:50:13,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 04:50:13" (3/3) ... [2021-05-06 04:50:13,762 INFO L111 eAbstractionObserver]: Analyzing ICFG ps5-ll_unwindbound50.c [2021-05-06 04:50:13,766 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 04:50:13,769 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 04:50:13,783 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 04:50:13,800 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 04:50:13,800 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 04:50:13,800 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 04:50:13,800 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 04:50:13,800 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 04:50:13,800 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 04:50:13,800 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 04:50:13,801 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 04:50:13,813 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 04:50:13,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 04:50:13,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:13,817 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:13,818 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:13,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:13,822 INFO L82 PathProgramCache]: Analyzing trace with hash 21872251, now seen corresponding path program 1 times [2021-05-06 04:50:13,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:13,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168404805] [2021-05-06 04:50:13,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:13,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:14,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 04:50:14,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:14,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 04:50:14,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:14,072 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:14,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:14,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168404805] [2021-05-06 04:50:14,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168404805] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:50:14,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:50:14,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 04:50:14,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128257895] [2021-05-06 04:50:14,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 04:50:14,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:14,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 04:50:14,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:50:14,089 INFO L87 Difference]: Start difference. First operand has 29 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2021-05-06 04:50:14,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:14,199 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-05-06 04:50:14,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 04:50:14,201 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 17 [2021-05-06 04:50:14,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:14,206 INFO L225 Difference]: With dead ends: 50 [2021-05-06 04:50:14,207 INFO L226 Difference]: Without dead ends: 25 [2021-05-06 04:50:14,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 04:50:14,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-06 04:50:14,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-06 04:50:14,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:50:14,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-06 04:50:14,250 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2021-05-06 04:50:14,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:14,251 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-06 04:50:14,251 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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) [2021-05-06 04:50:14,252 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-06 04:50:14,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:50:14,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:14,254 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:14,254 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 04:50:14,254 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:14,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:14,256 INFO L82 PathProgramCache]: Analyzing trace with hash -119968982, now seen corresponding path program 1 times [2021-05-06 04:50:14,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:14,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119641586] [2021-05-06 04:50:14,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:14,281 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:14,281 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1023305917] [2021-05-06 04:50:14,281 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 [2021-05-06 04:50:14,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:14,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 04:50:14,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:14,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,514 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:14,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:14,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119641586] [2021-05-06 04:50:14,518 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:14,518 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023305917] [2021-05-06 04:50:14,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023305917] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:50:14,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:50:14,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 04:50:14,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023900461] [2021-05-06 04:50:14,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 04:50:14,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:14,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 04:50:14,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:50:14,524 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-05-06 04:50:14,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:14,552 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2021-05-06 04:50:14,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 04:50:14,553 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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 18 [2021-05-06 04:50:14,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:14,554 INFO L225 Difference]: With dead ends: 34 [2021-05-06 04:50:14,554 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 04:50:14,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 04:50:14,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 04:50:14,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 04:50:14,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:50:14,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-06 04:50:14,574 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 18 [2021-05-06 04:50:14,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:14,574 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-06 04:50:14,574 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 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) [2021-05-06 04:50:14,574 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-06 04:50:14,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 04:50:14,575 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:14,575 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:14,775 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 04:50:14,776 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:14,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:14,776 INFO L82 PathProgramCache]: Analyzing trace with hash -118181522, now seen corresponding path program 1 times [2021-05-06 04:50:14,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:14,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201707558] [2021-05-06 04:50:14,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:14,791 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:14,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [365244841] [2021-05-06 04:50:14,792 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 [2021-05-06 04:50:14,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:14,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:50:14,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:14,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:14,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:14,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:14,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201707558] [2021-05-06 04:50:14,931 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:14,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365244841] [2021-05-06 04:50:14,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365244841] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 04:50:14,931 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 04:50:14,931 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 04:50:14,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [226791869] [2021-05-06 04:50:14,932 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:50:14,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:14,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:50:14,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:50:14,932 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:50:14,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:14,997 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-06 04:50:14,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 04:50:14,998 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 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 [2021-05-06 04:50:14,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:15,000 INFO L225 Difference]: With dead ends: 36 [2021-05-06 04:50:15,000 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 04:50:15,001 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 17.9ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:50:15,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 04:50:15,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 04:50:15,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 21 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:50:15,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-06 04:50:15,010 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 18 [2021-05-06 04:50:15,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:15,011 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-06 04:50:15,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 04:50:15,011 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-06 04:50:15,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 04:50:15,012 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:15,012 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:15,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:15,229 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:15,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:15,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1364840471, now seen corresponding path program 1 times [2021-05-06 04:50:15,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:15,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [956050721] [2021-05-06 04:50:15,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:15,243 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:15,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2078166715] [2021-05-06 04:50:15,244 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 [2021-05-06 04:50:15,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:15,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 04:50:15,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:15,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:15,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:15,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [956050721] [2021-05-06 04:50:15,384 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:15,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078166715] [2021-05-06 04:50:15,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078166715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:50:15,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:50:15,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 04:50:15,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640884559] [2021-05-06 04:50:15,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 04:50:15,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:15,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 04:50:15,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 04:50:15,386 INFO L87 Difference]: Start difference. First operand 32 states and 35 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:50:15,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:15,423 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 04:50:15,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:50:15,424 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-06 04:50:15,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:15,425 INFO L225 Difference]: With dead ends: 42 [2021-05-06 04:50:15,425 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 04:50:15,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:50:15,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 04:50:15,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-06 04:50:15,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 04:50:15,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-06 04:50:15,447 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-06 04:50:15,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:15,448 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-06 04:50:15,448 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, (5), 4 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 04:50:15,448 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-06 04:50:15,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 04:50:15,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:15,450 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:15,664 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:15,665 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:15,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:15,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1363053011, now seen corresponding path program 1 times [2021-05-06 04:50:15,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:15,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542143354] [2021-05-06 04:50:15,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:15,679 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:15,679 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1206654991] [2021-05-06 04:50:15,679 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 [2021-05-06 04:50:15,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:15,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 04:50:15,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:15,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:15,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:15,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:15,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542143354] [2021-05-06 04:50:15,842 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:15,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206654991] [2021-05-06 04:50:15,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206654991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:50:15,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:50:15,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:50:15,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115485698] [2021-05-06 04:50:15,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:50:15,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:15,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:50:15,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:50:15,849 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:50:15,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:15,962 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-06 04:50:15,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 04:50:15,962 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 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 26 [2021-05-06 04:50:15,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:15,963 INFO L225 Difference]: With dead ends: 44 [2021-05-06 04:50:15,963 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 04:50:15,964 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.1ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:50:15,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 04:50:15,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-06 04:50:15,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 28 states have internal predecessors, (30), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:50:15,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 46 transitions. [2021-05-06 04:50:15,969 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 46 transitions. Word has length 26 [2021-05-06 04:50:15,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:15,969 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 46 transitions. [2021-05-06 04:50:15,969 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 04:50:15,969 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 46 transitions. [2021-05-06 04:50:15,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 04:50:15,970 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:15,970 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:16,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:16,175 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:16,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:16,175 INFO L82 PathProgramCache]: Analyzing trace with hash -595737176, now seen corresponding path program 2 times [2021-05-06 04:50:16,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:16,176 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726068266] [2021-05-06 04:50:16,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:16,184 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:16,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2042589747] [2021-05-06 04:50:16,184 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:16,252 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:50:16,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:50:16,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 04:50:16,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:16,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,330 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 04:50:16,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:16,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726068266] [2021-05-06 04:50:16,331 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:16,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042589747] [2021-05-06 04:50:16,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042589747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:50:16,331 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:50:16,331 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 04:50:16,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391879599] [2021-05-06 04:50:16,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 04:50:16,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:16,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 04:50:16,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 04:50:16,332 INFO L87 Difference]: Start difference. First operand 41 states and 46 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:50:16,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:16,391 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-06 04:50:16,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 04:50:16,392 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-06 04:50:16,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:16,393 INFO L225 Difference]: With dead ends: 58 [2021-05-06 04:50:16,393 INFO L226 Difference]: Without dead ends: 48 [2021-05-06 04:50:16,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 19.5ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-06 04:50:16,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-06 04:50:16,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-06 04:50:16,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 30 states have (on average 1.1333333333333333) internal successors, (34), 31 states have internal predecessors, (34), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-06 04:50:16,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-06 04:50:16,399 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 34 [2021-05-06 04:50:16,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:16,399 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-06 04:50:16,399 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, (6), 5 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 04:50:16,399 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-06 04:50:16,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 04:50:16,400 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:16,400 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:16,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 04:50:16,620 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:16,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:16,621 INFO L82 PathProgramCache]: Analyzing trace with hash -593949716, now seen corresponding path program 2 times [2021-05-06 04:50:16,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:16,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538274316] [2021-05-06 04:50:16,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:16,629 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:16,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1036717528] [2021-05-06 04:50:16,629 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 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 [2021-05-06 04:50:16,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 04:50:16,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 04:50:16,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-06 04:50:16,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:16,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:16,979 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 04:50:16,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:16,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538274316] [2021-05-06 04:50:16,979 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:16,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036717528] [2021-05-06 04:50:16,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036717528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:50:16,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:50:16,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-06 04:50:16,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359488799] [2021-05-06 04:50:16,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-06 04:50:16,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:16,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-06 04:50:16,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-06 04:50:16,981 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:50:17,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:17,130 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2021-05-06 04:50:17,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 04:50:17,130 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 34 [2021-05-06 04:50:17,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:17,131 INFO L225 Difference]: With dead ends: 56 [2021-05-06 04:50:17,131 INFO L226 Difference]: Without dead ends: 54 [2021-05-06 04:50:17,131 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 96.8ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-06 04:50:17,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-06 04:50:17,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-06 04:50:17,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 04:50:17,138 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-05-06 04:50:17,138 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 34 [2021-05-06 04:50:17,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:17,138 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-05-06 04:50:17,139 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 04:50:17,139 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-05-06 04:50:17,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-06 04:50:17,139 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:17,139 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:17,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:17,344 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:17,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:17,345 INFO L82 PathProgramCache]: Analyzing trace with hash -1559147673, now seen corresponding path program 1 times [2021-05-06 04:50:17,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:17,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635403944] [2021-05-06 04:50:17,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:17,352 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:17,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [301051101] [2021-05-06 04:50:17,352 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 [2021-05-06 04:50:17,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 04:50:17,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 04:50:17,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 04:50:17,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,497 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 04:50:17,541 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 04:50:17,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 04:50:17,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635403944] [2021-05-06 04:50:17,542 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 04:50:17,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301051101] [2021-05-06 04:50:17,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301051101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 04:50:17,542 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 04:50:17,542 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 04:50:17,542 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795830996] [2021-05-06 04:50:17,542 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 04:50:17,542 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 04:50:17,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 04:50:17,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-06 04:50:17,543 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 04:50:17,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 04:50:17,598 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-06 04:50:17,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 04:50:17,599 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 37 [2021-05-06 04:50:17,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 04:50:17,600 INFO L225 Difference]: With dead ends: 55 [2021-05-06 04:50:17,600 INFO L226 Difference]: Without dead ends: 49 [2021-05-06 04:50:17,601 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 36.4ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-06 04:50:17,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-06 04:50:17,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-06 04:50:17,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 32 states have (on average 1.125) internal successors, (36), 34 states have internal predecessors, (36), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 04:50:17,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-06 04:50:17,606 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 37 [2021-05-06 04:50:17,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 04:50:17,606 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-06 04:50:17,606 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 3.1666666666666665) internal successors, (19), 6 states have internal predecessors, (19), 4 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-06 04:50:17,607 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-06 04:50:17,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-06 04:50:17,607 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 04:50:17,607 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 04:50:17,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 04:50:17,825 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 04:50:17,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 04:50:17,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1224790937, now seen corresponding path program 3 times [2021-05-06 04:50:17,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 04:50:17,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053238023] [2021-05-06 04:50:17,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 04:50:17,833 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 04:50:17,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [458998204] [2021-05-06 04:50:17,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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