/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/hard2_valuebound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:41:06,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:41:06,427 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:41:06,457 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:41:06,472 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:41:06,473 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:41:06,474 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:41:06,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:41:06,477 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:41:06,478 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:41:06,479 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:41:06,483 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:41:06,485 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:41:06,489 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:41:06,489 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:41:06,490 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:41:06,491 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:41:06,496 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:41:06,497 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:41:06,497 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:41:06,498 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 15:41:06,517 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:41:06,518 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:41:06,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:41:06,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:41:06,520 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:41:06,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:41:06,520 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:41:06,520 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:41:06,520 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:41:06,532 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:41:06,533 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:41:06,534 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:41:06,534 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:41:06,534 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:41:06,535 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:41:06,535 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:41:06,535 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:41:06,768 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:41:06,782 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:41:06,784 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:41:06,784 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:41:06,785 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:41:06,786 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard2_valuebound5.c [2021-05-02 15:41:06,835 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c99064a04/281cacd0c7ad4f1680ebe3bb5d61afee/FLAGabbe9081d [2021-05-02 15:41:07,307 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:41:07,308 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard2_valuebound5.c [2021-05-02 15:41:07,313 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c99064a04/281cacd0c7ad4f1680ebe3bb5d61afee/FLAGabbe9081d [2021-05-02 15:41:07,328 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c99064a04/281cacd0c7ad4f1680ebe3bb5d61afee [2021-05-02 15:41:07,330 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:41:07,332 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:41:07,334 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:41:07,335 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:41:07,337 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:41:07,338 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,338 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5a3623e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07, skipping insertion in model container [2021-05-02 15:41:07,338 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,343 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:41:07,354 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:41:07,467 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/hard2_valuebound5.c[526,539] [2021-05-02 15:41:07,481 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:41:07,487 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:41:07,496 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/hard2_valuebound5.c[526,539] [2021-05-02 15:41:07,508 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:41:07,559 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:41:07,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07 WrapperNode [2021-05-02 15:41:07,560 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:41:07,561 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:41:07,561 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:41:07,562 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:41:07,570 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,571 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,577 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,577 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,587 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,591 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,595 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (1/1) ... [2021-05-02 15:41:07,597 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:41:07,598 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:41:07,598 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:41:07,598 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:41:07,599 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (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 15:41:07,656 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:41:07,657 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:41:07,657 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:41:07,657 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:41:07,657 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:41:07,657 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:41:07,657 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:41:07,658 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:41:07,658 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:41:07,658 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:41:07,658 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 15:41:07,658 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:41:07,659 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:41:07,659 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:41:07,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:41:07,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:41:07,659 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:41:07,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:41:07,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:41:07,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:41:07,840 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:41:07,841 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 15:41:07,842 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:41:07 BoogieIcfgContainer [2021-05-02 15:41:07,842 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:41:07,843 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:41:07,843 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:41:07,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:41:07,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:41:07" (1/3) ... [2021-05-02 15:41:07,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5598b31f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:41:07, skipping insertion in model container [2021-05-02 15:41:07,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:41:07" (2/3) ... [2021-05-02 15:41:07,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5598b31f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:41:07, skipping insertion in model container [2021-05-02 15:41:07,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:41:07" (3/3) ... [2021-05-02 15:41:07,863 INFO L111 eAbstractionObserver]: Analyzing ICFG hard2_valuebound5.c [2021-05-02 15:41:07,867 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:41:07,869 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:41:07,887 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:41:07,913 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:41:07,913 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:41:07,914 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:41:07,914 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:41:07,914 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:41:07,914 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:41:07,914 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:41:07,914 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:41:07,924 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 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 15:41:07,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 15:41:07,927 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:07,928 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:07,928 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:07,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:07,931 INFO L82 PathProgramCache]: Analyzing trace with hash -977830905, now seen corresponding path program 1 times [2021-05-02 15:41:07,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:07,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656303065] [2021-05-02 15:41:07,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:07,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:41:08,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:41:08,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,120 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 15:41:08,120 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:08,120 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656303065] [2021-05-02 15:41:08,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656303065] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:41:08,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:41:08,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:41:08,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815703087] [2021-05-02 15:41:08,124 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:41:08,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:08,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:41:08,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:41:08,141 INFO L87 Difference]: Start difference. First operand has 35 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 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 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) [2021-05-02 15:41:08,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:08,257 INFO L93 Difference]: Finished difference Result 61 states and 95 transitions. [2021-05-02 15:41:08,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:41:08,259 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 [2021-05-02 15:41:08,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:08,264 INFO L225 Difference]: With dead ends: 61 [2021-05-02 15:41:08,264 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 15:41:08,267 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 44.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:41:08,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 15:41:08,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 15:41:08,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 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 15:41:08,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2021-05-02 15:41:08,308 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 17 [2021-05-02 15:41:08,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:08,309 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2021-05-02 15:41:08,309 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) [2021-05-02 15:41:08,309 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2021-05-02 15:41:08,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 15:41:08,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:08,310 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:08,310 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:41:08,310 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:08,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:08,311 INFO L82 PathProgramCache]: Analyzing trace with hash -297772535, now seen corresponding path program 1 times [2021-05-02 15:41:08,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:08,312 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102679071] [2021-05-02 15:41:08,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:08,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:41:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:41:08,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,437 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 15:41:08,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:08,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102679071] [2021-05-02 15:41:08,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1102679071] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:41:08,438 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:41:08,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:41:08,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504920298] [2021-05-02 15:41:08,439 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:41:08,439 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:08,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:41:08,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:41:08,442 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 15:41:08,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:08,698 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2021-05-02 15:41:08,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:41:08,698 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 17 [2021-05-02 15:41:08,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:08,700 INFO L225 Difference]: With dead ends: 43 [2021-05-02 15:41:08,700 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 15:41:08,701 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 142.0ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:08,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 15:41:08,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 34. [2021-05-02 15:41:08,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 20 states have internal predecessors, (23), 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 15:41:08,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-05-02 15:41:08,715 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 17 [2021-05-02 15:41:08,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:08,715 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-05-02 15:41:08,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 15:41:08,715 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-05-02 15:41:08,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 15:41:08,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:08,716 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] [2021-05-02 15:41:08,717 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 15:41:08,717 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:08,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:08,720 INFO L82 PathProgramCache]: Analyzing trace with hash -1294462534, now seen corresponding path program 1 times [2021-05-02 15:41:08,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:08,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378152667] [2021-05-02 15:41:08,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:08,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:41:08,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:41:08,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-02 15:41:08,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:08,799 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 15:41:08,799 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:08,799 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378152667] [2021-05-02 15:41:08,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378152667] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:41:08,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:41:08,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:41:08,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197568436] [2021-05-02 15:41:08,800 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:41:08,800 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:08,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:41:08,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:41:08,800 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 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 15:41:09,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:09,008 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-02 15:41:09,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:41:09,008 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 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 22 [2021-05-02 15:41:09,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:09,009 INFO L225 Difference]: With dead ends: 47 [2021-05-02 15:41:09,009 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:41:09,010 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 110.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:09,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:41:09,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 38. [2021-05-02 15:41:09,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 23 states have internal predecessors, (26), 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 15:41:09,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-05-02 15:41:09,029 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 22 [2021-05-02 15:41:09,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:09,029 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-05-02 15:41:09,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 4 states have internal predecessors, (14), 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 15:41:09,030 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-05-02 15:41:09,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 15:41:09,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:09,031 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] [2021-05-02 15:41:09,031 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 15:41:09,031 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:09,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:09,032 INFO L82 PathProgramCache]: Analyzing trace with hash -1449027479, now seen corresponding path program 1 times [2021-05-02 15:41:09,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:09,032 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058500487] [2021-05-02 15:41:09,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:09,058 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:09,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [19883310] [2021-05-02 15:41:09,058 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 15:41:09,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:09,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:41:09,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:09,250 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:41:09,250 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:09,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058500487] [2021-05-02 15:41:09,250 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:09,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [19883310] [2021-05-02 15:41:09,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [19883310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:09,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:09,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:41:09,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755402286] [2021-05-02 15:41:09,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:41:09,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:09,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:41:09,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:41:09,252 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:41:09,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:09,398 INFO L93 Difference]: Finished difference Result 70 states and 87 transitions. [2021-05-02 15:41:09,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:41:09,399 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 27 [2021-05-02 15:41:09,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:09,400 INFO L225 Difference]: With dead ends: 70 [2021-05-02 15:41:09,400 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 15:41:09,402 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 47.9ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:09,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 15:41:09,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 15:41:09,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 32 states have (on average 1.15625) internal successors, (37), 34 states have internal predecessors, (37), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:41:09,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 66 transitions. [2021-05-02 15:41:09,417 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 66 transitions. Word has length 27 [2021-05-02 15:41:09,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:09,417 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 66 transitions. [2021-05-02 15:41:09,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:41:09,417 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 66 transitions. [2021-05-02 15:41:09,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 15:41:09,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:09,418 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] [2021-05-02 15:41:09,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:09,634 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:09,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:09,634 INFO L82 PathProgramCache]: Analyzing trace with hash 905213191, now seen corresponding path program 1 times [2021-05-02 15:41:09,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:09,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [650822685] [2021-05-02 15:41:09,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:09,641 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:09,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1414702550] [2021-05-02 15:41:09,641 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 15:41:09,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:09,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 15:41:09,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:09,769 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 15:41:09,769 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:09,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [650822685] [2021-05-02 15:41:09,770 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:09,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414702550] [2021-05-02 15:41:09,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414702550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:09,770 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:09,770 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:41:09,770 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787594557] [2021-05-02 15:41:09,770 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:41:09,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:09,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:41:09,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:41:09,771 INFO L87 Difference]: Start difference. First operand 56 states and 66 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:41:09,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:09,858 INFO L93 Difference]: Finished difference Result 69 states and 83 transitions. [2021-05-02 15:41:09,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:41:09,861 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 15:41:09,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:09,864 INFO L225 Difference]: With dead ends: 69 [2021-05-02 15:41:09,864 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 15:41:09,864 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 28.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:41:09,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 15:41:09,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 15:41:09,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 38 states have internal predecessors, (42), 16 states have call successors, (16), 9 states have call predecessors, (16), 8 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 15:41:09,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2021-05-02 15:41:09,871 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 34 [2021-05-02 15:41:09,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:09,871 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2021-05-02 15:41:09,871 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:41:09,871 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2021-05-02 15:41:09,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 15:41:09,872 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:09,872 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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 15:41:10,084 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:10,085 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:10,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:10,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1576096488, now seen corresponding path program 1 times [2021-05-02 15:41:10,085 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:10,085 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102089128] [2021-05-02 15:41:10,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:10,092 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:10,092 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1306730405] [2021-05-02 15:41:10,092 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 15:41:10,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:10,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 15:41:10,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:10,242 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:41:10,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:10,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102089128] [2021-05-02 15:41:10,242 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:10,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306730405] [2021-05-02 15:41:10,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306730405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:10,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:10,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:41:10,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771709337] [2021-05-02 15:41:10,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:41:10,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:10,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:41:10,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:41:10,243 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 15:41:10,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:10,419 INFO L93 Difference]: Finished difference Result 108 states and 138 transitions. [2021-05-02 15:41:10,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:41:10,419 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 44 [2021-05-02 15:41:10,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:10,423 INFO L225 Difference]: With dead ends: 108 [2021-05-02 15:41:10,423 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 15:41:10,424 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 51.4ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:41:10,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 15:41:10,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 15:41:10,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 47 states have (on average 1.148936170212766) internal successors, (54), 49 states have internal predecessors, (54), 21 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:41:10,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 94 transitions. [2021-05-02 15:41:10,444 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 94 transitions. Word has length 44 [2021-05-02 15:41:10,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:10,445 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 94 transitions. [2021-05-02 15:41:10,445 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 15:41:10,445 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 94 transitions. [2021-05-02 15:41:10,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 15:41:10,449 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:10,449 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 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 15:41:10,667 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:10,670 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:10,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:10,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1230656439, now seen corresponding path program 2 times [2021-05-02 15:41:10,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:10,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920514082] [2021-05-02 15:41:10,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:10,677 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:10,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [685660069] [2021-05-02 15:41:10,677 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 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 15:41:10,724 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:41:10,725 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:10,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 15:41:10,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:10,887 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 33 proven. 17 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 15:41:10,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:10,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920514082] [2021-05-02 15:41:10,888 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:10,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685660069] [2021-05-02 15:41:10,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685660069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:10,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:10,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:10,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1450425164] [2021-05-02 15:41:10,888 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:10,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:10,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:10,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:10,889 INFO L87 Difference]: Start difference. First operand 79 states and 94 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:41:11,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:11,104 INFO L93 Difference]: Finished difference Result 131 states and 169 transitions. [2021-05-02 15:41:11,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:41:11,104 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 61 [2021-05-02 15:41:11,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:11,105 INFO L225 Difference]: With dead ends: 131 [2021-05-02 15:41:11,105 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 15:41:11,106 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 58.6ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:11,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 15:41:11,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2021-05-02 15:41:11,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 59 states have (on average 1.152542372881356) internal successors, (68), 62 states have internal predecessors, (68), 28 states have call successors, (28), 13 states have call predecessors, (28), 12 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 15:41:11,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 122 transitions. [2021-05-02 15:41:11,114 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 122 transitions. Word has length 61 [2021-05-02 15:41:11,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:11,114 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 122 transitions. [2021-05-02 15:41:11,114 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:41:11,114 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 122 transitions. [2021-05-02 15:41:11,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 15:41:11,115 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:11,115 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] [2021-05-02 15:41:11,331 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:11,331 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:11,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:11,331 INFO L82 PathProgramCache]: Analyzing trace with hash 1615471943, now seen corresponding path program 1 times [2021-05-02 15:41:11,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:11,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414269327] [2021-05-02 15:41:11,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:11,340 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:11,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1028411211] [2021-05-02 15:41:11,341 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 15:41:11,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:11,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 15:41:11,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:11,577 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 24 proven. 20 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-05-02 15:41:11,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:11,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414269327] [2021-05-02 15:41:11,578 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:11,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028411211] [2021-05-02 15:41:11,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028411211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:11,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:11,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:41:11,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563243975] [2021-05-02 15:41:11,579 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:41:11,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:11,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:41:11,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:41:11,580 INFO L87 Difference]: Start difference. First operand 100 states and 122 transitions. Second operand has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-05-02 15:41:11,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:11,729 INFO L93 Difference]: Finished difference Result 123 states and 147 transitions. [2021-05-02 15:41:11,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:41:11,730 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 64 [2021-05-02 15:41:11,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:11,731 INFO L225 Difference]: With dead ends: 123 [2021-05-02 15:41:11,731 INFO L226 Difference]: Without dead ends: 121 [2021-05-02 15:41:11,731 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 56.9ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:41:11,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-05-02 15:41:11,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2021-05-02 15:41:11,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 73 states have (on average 1.1506849315068493) internal successors, (84), 75 states have internal predecessors, (84), 30 states have call successors, (30), 16 states have call predecessors, (30), 15 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 15:41:11,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 142 transitions. [2021-05-02 15:41:11,740 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 142 transitions. Word has length 64 [2021-05-02 15:41:11,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:11,740 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 142 transitions. [2021-05-02 15:41:11,740 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.6666666666666665) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-05-02 15:41:11,740 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 142 transitions. [2021-05-02 15:41:11,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 15:41:11,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:11,741 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 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] [2021-05-02 15:41:11,958 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:11,959 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:11,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:11,959 INFO L82 PathProgramCache]: Analyzing trace with hash -262609796, now seen corresponding path program 2 times [2021-05-02 15:41:11,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:11,959 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199583688] [2021-05-02 15:41:11,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:11,965 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:11,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1704886537] [2021-05-02 15:41:11,965 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 [2021-05-02 15:41:12,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:41:12,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:12,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 15:41:12,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:12,185 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 26 proven. 24 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 15:41:12,186 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:12,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199583688] [2021-05-02 15:41:12,186 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:12,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704886537] [2021-05-02 15:41:12,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704886537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:12,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:12,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:12,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818561544] [2021-05-02 15:41:12,186 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:12,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:12,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:12,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:12,188 INFO L87 Difference]: Start difference. First operand 119 states and 142 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 15:41:12,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:12,346 INFO L93 Difference]: Finished difference Result 146 states and 176 transitions. [2021-05-02 15:41:12,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:41:12,346 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) Word has length 69 [2021-05-02 15:41:12,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:12,350 INFO L225 Difference]: With dead ends: 146 [2021-05-02 15:41:12,350 INFO L226 Difference]: Without dead ends: 123 [2021-05-02 15:41:12,351 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 59.3ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:12,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-02 15:41:12,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 123. [2021-05-02 15:41:12,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 75 states have (on average 1.12) internal successors, (84), 78 states have internal predecessors, (84), 31 states have call successors, (31), 17 states have call predecessors, (31), 16 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 15:41:12,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 143 transitions. [2021-05-02 15:41:12,366 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 143 transitions. Word has length 69 [2021-05-02 15:41:12,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:12,366 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 143 transitions. [2021-05-02 15:41:12,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 9 states have internal predecessors, (24), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 4 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 15:41:12,366 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 143 transitions. [2021-05-02 15:41:12,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 15:41:12,369 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:12,369 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 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] [2021-05-02 15:41:12,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:12,581 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:12,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:12,581 INFO L82 PathProgramCache]: Analyzing trace with hash -1554666020, now seen corresponding path program 1 times [2021-05-02 15:41:12,581 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:12,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511119209] [2021-05-02 15:41:12,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:12,587 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:12,587 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [927967383] [2021-05-02 15:41:12,587 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 15:41:12,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:12,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 15:41:12,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:12,811 INFO L134 CoverageAnalysis]: Checked inductivity of 209 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 15:41:12,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:12,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511119209] [2021-05-02 15:41:12,811 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:12,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927967383] [2021-05-02 15:41:12,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927967383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:12,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:12,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:12,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449483984] [2021-05-02 15:41:12,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:12,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:12,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:12,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:12,812 INFO L87 Difference]: Start difference. First operand 123 states and 143 transitions. Second operand has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 15:41:12,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:12,951 INFO L93 Difference]: Finished difference Result 129 states and 148 transitions. [2021-05-02 15:41:12,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:41:12,952 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2021-05-02 15:41:12,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:12,954 INFO L225 Difference]: With dead ends: 129 [2021-05-02 15:41:12,954 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 15:41:12,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 58.8ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:12,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 15:41:12,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 15:41:12,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 61 states have (on average 1.1311475409836065) internal successors, (69), 63 states have internal predecessors, (69), 26 states have call successors, (26), 14 states have call predecessors, (26), 13 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 15:41:12,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 119 transitions. [2021-05-02 15:41:12,962 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 119 transitions. Word has length 75 [2021-05-02 15:41:12,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:12,962 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 119 transitions. [2021-05-02 15:41:12,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.7777777777777777) internal successors, (25), 9 states have internal predecessors, (25), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 15:41:12,963 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 119 transitions. [2021-05-02 15:41:12,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 15:41:12,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:12,964 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:13,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 15:41:13,173 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:13,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:13,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1862740680, now seen corresponding path program 3 times [2021-05-02 15:41:13,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:13,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809045322] [2021-05-02 15:41:13,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:13,179 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:13,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [886046509] [2021-05-02 15:41:13,179 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 [2021-05-02 15:41:13,233 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:41:13,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:13,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 15:41:13,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:13,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:13,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:13,453 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 82 proven. 8 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-05-02 15:41:13,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:13,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809045322] [2021-05-02 15:41:13,454 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:13,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886046509] [2021-05-02 15:41:13,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886046509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:13,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:13,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:13,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935291194] [2021-05-02 15:41:13,454 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:13,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:13,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:13,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:13,456 INFO L87 Difference]: Start difference. First operand 101 states and 119 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:41:13,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:13,596 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2021-05-02 15:41:13,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:41:13,596 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-05-02 15:41:13,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:13,598 INFO L225 Difference]: With dead ends: 122 [2021-05-02 15:41:13,598 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 15:41:13,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 59.2ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:13,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 15:41:13,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 15:41:13,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 66 states have (on average 1.121212121212121) internal successors, (74), 68 states have internal predecessors, (74), 28 states have call successors, (28), 15 states have call predecessors, (28), 14 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 15:41:13,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 128 transitions. [2021-05-02 15:41:13,612 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 128 transitions. Word has length 78 [2021-05-02 15:41:13,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:13,612 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 128 transitions. [2021-05-02 15:41:13,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 7 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:41:13,613 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 128 transitions. [2021-05-02 15:41:13,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 15:41:13,614 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:13,614 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 3, 3, 3, 3, 3, 3, 3, 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 15:41:13,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:41:13,825 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:13,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:13,825 INFO L82 PathProgramCache]: Analyzing trace with hash 330473976, now seen corresponding path program 3 times [2021-05-02 15:41:13,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:13,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903081741] [2021-05-02 15:41:13,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:13,831 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:13,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [177580844] [2021-05-02 15:41:13,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:13,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 15:41:13,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:13,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 15:41:13,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:14,064 INFO L134 CoverageAnalysis]: Checked inductivity of 259 backedges. 39 proven. 30 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-05-02 15:41:14,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:14,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903081741] [2021-05-02 15:41:14,064 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:14,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [177580844] [2021-05-02 15:41:14,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [177580844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:14,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:14,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:14,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120647559] [2021-05-02 15:41:14,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:14,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:14,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:14,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:14,066 INFO L87 Difference]: Start difference. First operand 109 states and 128 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 15:41:14,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:14,292 INFO L93 Difference]: Finished difference Result 130 states and 151 transitions. [2021-05-02 15:41:14,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 15:41:14,292 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 81 [2021-05-02 15:41:14,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:14,293 INFO L225 Difference]: With dead ends: 130 [2021-05-02 15:41:14,293 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 15:41:14,293 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 65.0ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:14,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 15:41:14,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2021-05-02 15:41:14,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 78 states have (on average 1.1282051282051282) internal successors, (88), 80 states have internal predecessors, (88), 30 states have call successors, (30), 18 states have call predecessors, (30), 17 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 15:41:14,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 146 transitions. [2021-05-02 15:41:14,306 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 146 transitions. Word has length 81 [2021-05-02 15:41:14,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:14,307 INFO L480 AbstractCegarLoop]: Abstraction has 126 states and 146 transitions. [2021-05-02 15:41:14,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 15:41:14,307 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 146 transitions. [2021-05-02 15:41:14,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 15:41:14,309 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:14,309 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:14,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:14,517 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:14,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:14,517 INFO L82 PathProgramCache]: Analyzing trace with hash -454578581, now seen corresponding path program 4 times [2021-05-02 15:41:14,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:14,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862119150] [2021-05-02 15:41:14,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:14,523 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:14,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1135664563] [2021-05-02 15:41:14,523 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:14,569 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 15:41:14,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:14,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 15:41:14,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:14,751 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 32 proven. 43 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-05-02 15:41:14,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:14,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862119150] [2021-05-02 15:41:14,751 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:14,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135664563] [2021-05-02 15:41:14,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135664563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:14,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:14,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:14,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421244876] [2021-05-02 15:41:14,752 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:14,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:14,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:14,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:14,753 INFO L87 Difference]: Start difference. First operand 126 states and 146 transitions. Second operand has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 4 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 15:41:14,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:14,910 INFO L93 Difference]: Finished difference Result 142 states and 165 transitions. [2021-05-02 15:41:14,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 15:41:14,911 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 4 states have call predecessors, (14), 5 states have call successors, (14) Word has length 86 [2021-05-02 15:41:14,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:14,911 INFO L225 Difference]: With dead ends: 142 [2021-05-02 15:41:14,912 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 15:41:14,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 56.4ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:14,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 15:41:14,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 134. [2021-05-02 15:41:14,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 83 states have (on average 1.1204819277108433) internal successors, (93), 85 states have internal predecessors, (93), 32 states have call successors, (32), 19 states have call predecessors, (32), 18 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 15:41:14,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 155 transitions. [2021-05-02 15:41:14,920 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 155 transitions. Word has length 86 [2021-05-02 15:41:14,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:14,920 INFO L480 AbstractCegarLoop]: Abstraction has 134 states and 155 transitions. [2021-05-02 15:41:14,920 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.6) internal successors, (26), 9 states have internal predecessors, (26), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 4 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 15:41:14,920 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 155 transitions. [2021-05-02 15:41:14,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 15:41:14,921 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:14,921 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:15,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:15,129 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:15,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:15,130 INFO L82 PathProgramCache]: Analyzing trace with hash -132947769, now seen corresponding path program 5 times [2021-05-02 15:41:15,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:15,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000582541] [2021-05-02 15:41:15,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:15,136 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:15,136 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [54338888] [2021-05-02 15:41:15,136 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:15,199 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 15:41:15,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:15,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 15:41:15,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 66 proven. 50 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-05-02 15:41:15,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:15,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000582541] [2021-05-02 15:41:15,428 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:15,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54338888] [2021-05-02 15:41:15,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [54338888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:15,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:15,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:41:15,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24964905] [2021-05-02 15:41:15,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:41:15,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:15,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:41:15,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:15,429 INFO L87 Difference]: Start difference. First operand 134 states and 155 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:15,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:15,717 INFO L93 Difference]: Finished difference Result 169 states and 203 transitions. [2021-05-02 15:41:15,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:41:15,717 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 94 [2021-05-02 15:41:15,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:15,718 INFO L225 Difference]: With dead ends: 169 [2021-05-02 15:41:15,718 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 15:41:15,719 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 100.6ms TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:41:15,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 15:41:15,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 15:41:15,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 87 states have (on average 1.1149425287356323) internal successors, (97), 89 states have internal predecessors, (97), 32 states have call successors, (32), 20 states have call predecessors, (32), 19 states have return successors, (30), 29 states have call predecessors, (30), 30 states have call successors, (30) [2021-05-02 15:41:15,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 159 transitions. [2021-05-02 15:41:15,728 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 159 transitions. Word has length 94 [2021-05-02 15:41:15,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:15,728 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 159 transitions. [2021-05-02 15:41:15,728 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:15,728 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 159 transitions. [2021-05-02 15:41:15,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-05-02 15:41:15,729 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:15,729 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:15,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 15:41:15,945 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:15,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:15,945 INFO L82 PathProgramCache]: Analyzing trace with hash -1821891511, now seen corresponding path program 1 times [2021-05-02 15:41:15,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:15,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035908233] [2021-05-02 15:41:15,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:15,951 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:15,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1313476138] [2021-05-02 15:41:15,951 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 15:41:16,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:16,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 15:41:16,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:16,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,030 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,043 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,170 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:16,249 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 132 proven. 0 refuted. 0 times theorem prover too weak. 230 trivial. 0 not checked. [2021-05-02 15:41:16,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:16,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035908233] [2021-05-02 15:41:16,249 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:16,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313476138] [2021-05-02 15:41:16,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313476138] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:41:16,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:41:16,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:41:16,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377244915] [2021-05-02 15:41:16,249 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:41:16,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:16,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:41:16,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:41:16,250 INFO L87 Difference]: Start difference. First operand 139 states and 159 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:16,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:16,333 INFO L93 Difference]: Finished difference Result 186 states and 219 transitions. [2021-05-02 15:41:16,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:41:16,333 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 94 [2021-05-02 15:41:16,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:16,334 INFO L225 Difference]: With dead ends: 186 [2021-05-02 15:41:16,334 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 15:41:16,335 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 30.4ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:41:16,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 15:41:16,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 129. [2021-05-02 15:41:16,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 82 states have (on average 1.0853658536585367) internal successors, (89), 83 states have internal predecessors, (89), 27 states have call successors, (27), 20 states have call predecessors, (27), 19 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 15:41:16,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 141 transitions. [2021-05-02 15:41:16,342 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 141 transitions. Word has length 94 [2021-05-02 15:41:16,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:16,343 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 141 transitions. [2021-05-02 15:41:16,343 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 5 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:16,343 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 141 transitions. [2021-05-02 15:41:16,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 15:41:16,343 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:16,343 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 3, 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 15:41:16,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:41:16,562 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:16,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:16,562 INFO L82 PathProgramCache]: Analyzing trace with hash 799997287, now seen corresponding path program 6 times [2021-05-02 15:41:16,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:16,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793367523] [2021-05-02 15:41:16,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:16,569 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:16,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [876369087] [2021-05-02 15:41:16,569 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:16,646 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 15:41:16,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:16,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 15:41:16,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:16,828 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 99 proven. 47 refuted. 0 times theorem prover too weak. 278 trivial. 0 not checked. [2021-05-02 15:41:16,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:16,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793367523] [2021-05-02 15:41:16,828 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:16,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [876369087] [2021-05-02 15:41:16,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [876369087] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:16,828 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:16,828 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:41:16,828 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251726068] [2021-05-02 15:41:16,829 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:41:16,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:16,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:41:16,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:41:16,829 INFO L87 Difference]: Start difference. First operand 129 states and 141 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) [2021-05-02 15:41:16,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:16,971 INFO L93 Difference]: Finished difference Result 142 states and 158 transitions. [2021-05-02 15:41:16,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:41:16,972 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) Word has length 98 [2021-05-02 15:41:16,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:16,973 INFO L225 Difference]: With dead ends: 142 [2021-05-02 15:41:16,973 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 15:41:16,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 60.9ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:41:16,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 15:41:16,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 127. [2021-05-02 15:41:16,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 80 states have (on average 1.0875) internal successors, (87), 82 states have internal predecessors, (87), 27 states have call successors, (27), 20 states have call predecessors, (27), 19 states have return successors, (25), 24 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 15:41:16,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 139 transitions. [2021-05-02 15:41:16,980 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 139 transitions. Word has length 98 [2021-05-02 15:41:16,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:16,980 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 139 transitions. [2021-05-02 15:41:16,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (12), 4 states have call predecessors, (12), 3 states have call successors, (12) [2021-05-02 15:41:16,980 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 139 transitions. [2021-05-02 15:41:16,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 15:41:16,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:16,981 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:17,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 15:41:17,196 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:17,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:17,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1451809020, now seen corresponding path program 7 times [2021-05-02 15:41:17,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:17,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083504239] [2021-05-02 15:41:17,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:17,202 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:17,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [488347042] [2021-05-02 15:41:17,202 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:17,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:41:17,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 15:41:17,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:17,467 INFO L134 CoverageAnalysis]: Checked inductivity of 418 backedges. 36 proven. 57 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-05-02 15:41:17,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:17,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083504239] [2021-05-02 15:41:17,467 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:17,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488347042] [2021-05-02 15:41:17,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488347042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:17,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:17,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:41:17,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362259247] [2021-05-02 15:41:17,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:41:17,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:17,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:41:17,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:41:17,468 INFO L87 Difference]: Start difference. First operand 127 states and 139 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-02 15:41:17,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:17,640 INFO L93 Difference]: Finished difference Result 161 states and 184 transitions. [2021-05-02 15:41:17,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:41:17,641 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) Word has length 99 [2021-05-02 15:41:17,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:17,642 INFO L225 Difference]: With dead ends: 161 [2021-05-02 15:41:17,642 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 15:41:17,642 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 67.7ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 15:41:17,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 15:41:17,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2021-05-02 15:41:17,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 87 states have (on average 1.0804597701149425) internal successors, (94), 89 states have internal predecessors, (94), 30 states have call successors, (30), 21 states have call predecessors, (30), 20 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 15:41:17,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 151 transitions. [2021-05-02 15:41:17,649 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 151 transitions. Word has length 99 [2021-05-02 15:41:17,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:17,650 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 151 transitions. [2021-05-02 15:41:17,650 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 10 states have internal predecessors, (29), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 6 states have call predecessors, (16), 6 states have call successors, (16) [2021-05-02 15:41:17,650 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 151 transitions. [2021-05-02 15:41:17,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 15:41:17,650 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:17,650 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:17,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:17,865 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:17,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:17,865 INFO L82 PathProgramCache]: Analyzing trace with hash -321511332, now seen corresponding path program 8 times [2021-05-02 15:41:17,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:17,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586684217] [2021-05-02 15:41:17,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:17,870 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:17,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2141842429] [2021-05-02 15:41:17,870 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:17,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:41:17,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:17,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 15:41:17,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:18,099 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 41 proven. 64 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-05-02 15:41:18,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:18,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586684217] [2021-05-02 15:41:18,099 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:18,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141842429] [2021-05-02 15:41:18,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2141842429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:18,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:18,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:41:18,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217316908] [2021-05-02 15:41:18,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:41:18,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:18,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:41:18,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:41:18,100 INFO L87 Difference]: Start difference. First operand 138 states and 151 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 15:41:18,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:18,381 INFO L93 Difference]: Finished difference Result 177 states and 205 transitions. [2021-05-02 15:41:18,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:41:18,382 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 103 [2021-05-02 15:41:18,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:18,382 INFO L225 Difference]: With dead ends: 177 [2021-05-02 15:41:18,382 INFO L226 Difference]: Without dead ends: 169 [2021-05-02 15:41:18,383 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 69.7ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 15:41:18,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-02 15:41:18,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 169. [2021-05-02 15:41:18,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 105 states have (on average 1.0857142857142856) internal successors, (114), 107 states have internal predecessors, (114), 41 states have call successors, (41), 23 states have call predecessors, (41), 22 states have return successors, (38), 38 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-02 15:41:18,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 193 transitions. [2021-05-02 15:41:18,392 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 193 transitions. Word has length 103 [2021-05-02 15:41:18,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:18,392 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 193 transitions. [2021-05-02 15:41:18,392 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 15:41:18,392 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 193 transitions. [2021-05-02 15:41:18,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 15:41:18,393 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:18,393 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:18,611 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 15:41:18,611 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:18,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:18,612 INFO L82 PathProgramCache]: Analyzing trace with hash 1306280540, now seen corresponding path program 2 times [2021-05-02 15:41:18,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:18,612 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60457128] [2021-05-02 15:41:18,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:18,617 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:18,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [612339675] [2021-05-02 15:41:18,617 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:18,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:41:18,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:18,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 15:41:18,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:18,926 INFO L134 CoverageAnalysis]: Checked inductivity of 478 backedges. 85 proven. 51 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-05-02 15:41:18,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:18,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60457128] [2021-05-02 15:41:18,926 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:18,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612339675] [2021-05-02 15:41:18,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [612339675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:18,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:18,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:41:18,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665028858] [2021-05-02 15:41:18,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:41:18,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:18,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:41:18,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:41:18,928 INFO L87 Difference]: Start difference. First operand 169 states and 193 transitions. Second operand has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 15:41:19,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:19,220 INFO L93 Difference]: Finished difference Result 179 states and 201 transitions. [2021-05-02 15:41:19,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:41:19,220 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 105 [2021-05-02 15:41:19,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:19,221 INFO L225 Difference]: With dead ends: 179 [2021-05-02 15:41:19,221 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 15:41:19,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 135.2ms TimeCoverageRelationStatistics Valid=40, Invalid=200, Unknown=0, NotChecked=0, Total=240 [2021-05-02 15:41:19,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 15:41:19,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2021-05-02 15:41:19,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 138 states, 85 states have (on average 1.0941176470588236) internal successors, (93), 86 states have internal predecessors, (93), 34 states have call successors, (34), 19 states have call predecessors, (34), 18 states have return successors, (32), 32 states have call predecessors, (32), 32 states have call successors, (32) [2021-05-02 15:41:19,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 159 transitions. [2021-05-02 15:41:19,230 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 159 transitions. Word has length 105 [2021-05-02 15:41:19,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:19,231 INFO L480 AbstractCegarLoop]: Abstraction has 138 states and 159 transitions. [2021-05-02 15:41:19,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 12 states have internal predecessors, (30), 7 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 15:41:19,231 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 159 transitions. [2021-05-02 15:41:19,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 15:41:19,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:19,231 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:19,447 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:19,448 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:19,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:19,448 INFO L82 PathProgramCache]: Analyzing trace with hash -76721736, now seen corresponding path program 9 times [2021-05-02 15:41:19,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:19,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238423597] [2021-05-02 15:41:19,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:19,453 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:19,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [479311207] [2021-05-02 15:41:19,453 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:19,531 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 15:41:19,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:19,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 15:41:19,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:19,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:19,992 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 118 proven. 32 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2021-05-02 15:41:19,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:19,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238423597] [2021-05-02 15:41:19,992 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:19,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479311207] [2021-05-02 15:41:19,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479311207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:19,992 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:19,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 15:41:19,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711645438] [2021-05-02 15:41:19,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 15:41:19,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:19,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 15:41:19,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-02 15:41:19,993 INFO L87 Difference]: Start difference. First operand 138 states and 159 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:20,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:20,262 INFO L93 Difference]: Finished difference Result 176 states and 208 transitions. [2021-05-02 15:41:20,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:41:20,263 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) Word has length 111 [2021-05-02 15:41:20,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:20,264 INFO L225 Difference]: With dead ends: 176 [2021-05-02 15:41:20,264 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 15:41:20,264 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 191.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:41:20,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 15:41:20,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 163. [2021-05-02 15:41:20,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 101 states have (on average 1.108910891089109) internal successors, (112), 103 states have internal predecessors, (112), 40 states have call successors, (40), 22 states have call predecessors, (40), 21 states have return successors, (38), 37 states have call predecessors, (38), 38 states have call successors, (38) [2021-05-02 15:41:20,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 190 transitions. [2021-05-02 15:41:20,275 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 190 transitions. Word has length 111 [2021-05-02 15:41:20,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:20,275 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 190 transitions. [2021-05-02 15:41:20,275 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 11 states have internal predecessors, (30), 6 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 6 states have call predecessors, (15), 5 states have call successors, (15) [2021-05-02 15:41:20,275 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 190 transitions. [2021-05-02 15:41:20,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 15:41:20,276 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:20,276 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:20,480 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:20,481 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:20,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:20,481 INFO L82 PathProgramCache]: Analyzing trace with hash -238794489, now seen corresponding path program 10 times [2021-05-02 15:41:20,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:20,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881306177] [2021-05-02 15:41:20,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:20,487 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:20,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [704471666] [2021-05-02 15:41:20,487 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:20,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 15:41:20,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:20,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 15:41:20,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:20,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,573 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:20,759 INFO L134 CoverageAnalysis]: Checked inductivity of 699 backedges. 174 proven. 35 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-05-02 15:41:20,760 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:41:20,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881306177] [2021-05-02 15:41:20,760 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:41:20,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704471666] [2021-05-02 15:41:20,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704471666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:41:20,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:41:20,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:41:20,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712726640] [2021-05-02 15:41:20,760 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:41:20,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:41:20,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:41:20,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:41:20,761 INFO L87 Difference]: Start difference. First operand 163 states and 190 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 7 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) [2021-05-02 15:41:20,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:41:20,976 INFO L93 Difference]: Finished difference Result 212 states and 250 transitions. [2021-05-02 15:41:20,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:41:20,977 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 7 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) Word has length 124 [2021-05-02 15:41:20,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:41:20,977 INFO L225 Difference]: With dead ends: 212 [2021-05-02 15:41:20,977 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 15:41:20,978 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 113.5ms TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 15:41:20,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 15:41:20,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 124. [2021-05-02 15:41:20,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 78 states have (on average 1.064102564102564) internal successors, (83), 79 states have internal predecessors, (83), 27 states have call successors, (27), 19 states have call predecessors, (27), 18 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-05-02 15:41:20,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 135 transitions. [2021-05-02 15:41:20,986 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 135 transitions. Word has length 124 [2021-05-02 15:41:20,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:41:20,986 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 135 transitions. [2021-05-02 15:41:20,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 7 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (20), 8 states have call predecessors, (20), 7 states have call successors, (20) [2021-05-02 15:41:20,986 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 135 transitions. [2021-05-02 15:41:20,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 15:41:20,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:41:20,987 INFO L523 BasicCegarLoop]: trace histogram [19, 18, 18, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:41:21,191 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 15:41:21,191 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:41:21,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:41:21,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1927738231, now seen corresponding path program 2 times [2021-05-02 15:41:21,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:41:21,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648077321] [2021-05-02 15:41:21,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:41:21,196 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:41:21,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [279754842] [2021-05-02 15:41:21,196 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:41:21,250 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:41:21,250 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:41:21,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 15:41:21,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:41:21,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,422 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:21,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:41:54,279 WARN L205 SmtUtils]: Spent 30.83 s on a formula simplification. DAG size of input: 8441 DAG size of output: 8184 [2021-05-02 15:42:25,713 WARN L205 SmtUtils]: Spent 31.28 s on a formula simplification. DAG size of input: 8455 DAG size of output: 8194 [2021-05-02 15:43:12,443 WARN L205 SmtUtils]: Spent 46.58 s on a formula simplification. DAG size of input: 8464 DAG size of output: 8203 [2021-05-02 15:43:59,107 WARN L205 SmtUtils]: Spent 46.49 s on a formula simplification. DAG size of input: 8464 DAG size of output: 8203 [2021-05-02 15:44:13,847 WARN L205 SmtUtils]: Spent 14.61 s on a formula simplification that was a NOOP. DAG size: 8203