/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/ps6-ll_valuebound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:17:01,283 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:17:01,285 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:17:01,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:17:01,331 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:17:01,333 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:17:01,334 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:17:01,335 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:17:01,337 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:17:01,337 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:17:01,339 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:17:01,343 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:17:01,344 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:17:01,344 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:17:01,346 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:17:01,348 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:17:01,352 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:17:01,358 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:17:01,359 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:17:01,359 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:17:01,363 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 17:17:01,385 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:17:01,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:17:01,386 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:17:01,386 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:17:01,386 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:17:01,386 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:17:01,387 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:17:01,388 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:17:01,388 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:17:01,389 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:17:01,389 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:17:01,389 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:17:01,389 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:17:01,389 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:17:01,397 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:17:01,397 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:17:01,397 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:17:01,630 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:17:01,643 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:17:01,644 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:17:01,645 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:17:01,645 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:17:01,646 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound100.c [2021-05-02 17:17:01,686 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c6f3aaf0/a37c4c39f1ff4524a22dd87088d01914/FLAGffd99a517 [2021-05-02 17:17:02,050 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:17:02,051 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps6-ll_valuebound100.c [2021-05-02 17:17:02,055 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c6f3aaf0/a37c4c39f1ff4524a22dd87088d01914/FLAGffd99a517 [2021-05-02 17:17:02,069 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3c6f3aaf0/a37c4c39f1ff4524a22dd87088d01914 [2021-05-02 17:17:02,071 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:17:02,072 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:17:02,075 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:17:02,075 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:17:02,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:17:02,077 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,078 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a8f2235 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02, skipping insertion in model container [2021-05-02 17:17:02,078 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,082 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:17:02,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:17:02,201 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/ps6-ll_valuebound100.c[458,471] [2021-05-02 17:17:02,221 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:17:02,227 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:17:02,237 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/ps6-ll_valuebound100.c[458,471] [2021-05-02 17:17:02,256 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:17:02,272 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:17:02,272 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02 WrapperNode [2021-05-02 17:17:02,273 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:17:02,292 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:17:02,292 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:17:02,292 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:17:02,299 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,299 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,306 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,307 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,315 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,319 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,323 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (1/1) ... [2021-05-02 17:17:02,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:17:02,328 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:17:02,328 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:17:02,328 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:17:02,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (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 17:17:02,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:17:02,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:17:02,400 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:17:02,400 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:17:02,401 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:17:02,401 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:17:02,401 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:17:02,401 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:17:02,401 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:17:02,401 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:17:02,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 17:17:02,402 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:17:02,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:17:02,402 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:17:02,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:17:02,598 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:17:02,598 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:17:02,599 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:17:02 BoogieIcfgContainer [2021-05-02 17:17:02,599 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:17:02,600 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:17:02,600 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:17:02,602 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:17:02,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:17:02" (1/3) ... [2021-05-02 17:17:02,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e398d9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:17:02, skipping insertion in model container [2021-05-02 17:17:02,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:17:02" (2/3) ... [2021-05-02 17:17:02,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e398d9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:17:02, skipping insertion in model container [2021-05-02 17:17:02,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:17:02" (3/3) ... [2021-05-02 17:17:02,603 INFO L111 eAbstractionObserver]: Analyzing ICFG ps6-ll_valuebound100.c [2021-05-02 17:17:02,607 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:17:02,609 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:17:02,618 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:17:02,645 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:17:02,645 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:17:02,645 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:17:02,645 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:17:02,645 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:17:02,646 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:17:02,646 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:17:02,646 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:17:02,667 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:17:02,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:17:02,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:02,670 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:02,670 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:02,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:02,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1098891495, now seen corresponding path program 1 times [2021-05-02 17:17:02,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:02,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738570174] [2021-05-02 17:17:02,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:02,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:02,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:17:02,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:02,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:17:02,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:02,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 17:17:02,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:02,890 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:17:02,890 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:02,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738570174] [2021-05-02 17:17:02,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738570174] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:17:02,891 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:17:02,891 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:17:02,892 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2389214] [2021-05-02 17:17:02,895 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:17:02,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:02,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:17:02,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:17:02,906 INFO L87 Difference]: Start difference. First operand has 29 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 7 states have call successors, (7), 4 states have call predecessors, (7), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:17:05,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:05,056 INFO L93 Difference]: Finished difference Result 51 states and 69 transitions. [2021-05-02 17:17:05,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:17:05,058 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 17:17:05,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:05,062 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:17:05,062 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:17:05,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:17:05,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:17:05,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 17:17:05,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 17:17:05,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2021-05-02 17:17:05,087 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 22 [2021-05-02 17:17:05,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:05,087 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2021-05-02 17:17:05,087 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, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:17:05,087 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2021-05-02 17:17:05,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:17:05,088 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:05,088 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:05,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:17:05,088 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:05,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:05,089 INFO L82 PathProgramCache]: Analyzing trace with hash 769620075, now seen corresponding path program 1 times [2021-05-02 17:17:05,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:05,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2104607585] [2021-05-02 17:17:05,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:05,101 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:05,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1202313870] [2021-05-02 17:17:05,101 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 17:17:05,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:05,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:17:05,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:05,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:05,304 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:17:05,305 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:05,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2104607585] [2021-05-02 17:17:05,305 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:05,305 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1202313870] [2021-05-02 17:17:05,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1202313870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:05,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:05,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:17:05,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424558091] [2021-05-02 17:17:05,308 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:17:05,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:05,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:17:05,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:17:05,309 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:17:05,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:05,403 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-05-02 17:17:05,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:17:05,404 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 22 [2021-05-02 17:17:05,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:05,406 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:17:05,406 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 17:17:05,408 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 43.2ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:17:05,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 17:17:05,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-05-02 17:17:05,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 17:17:05,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 17:17:05,419 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 22 [2021-05-02 17:17:05,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:05,419 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 17:17:05,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 17:17:05,419 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 17:17:05,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:17:05,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:05,420 INFO L523 BasicCegarLoop]: trace histogram [2, 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 17:17:05,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 17:17:05,621 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:05,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:05,622 INFO L82 PathProgramCache]: Analyzing trace with hash 645812411, now seen corresponding path program 1 times [2021-05-02 17:17:05,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:05,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501048706] [2021-05-02 17:17:05,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:05,631 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:05,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769977723] [2021-05-02 17:17:05,631 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 17:17:05,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:05,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:17:05,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:05,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:05,773 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:17:05,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:05,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501048706] [2021-05-02 17:17:05,774 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:05,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769977723] [2021-05-02 17:17:05,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769977723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:05,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:05,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:17:05,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745121173] [2021-05-02 17:17:05,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:17:05,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:05,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:17:05,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:17:05,775 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:17:05,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:05,868 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 17:17:05,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:17:05,869 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2021-05-02 17:17:05,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:05,871 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:17:05,871 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 17:17:05,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:17:05,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 17:17:05,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 17:17:05,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 25 states have internal predecessors, (26), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 17:17:05,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2021-05-02 17:17:05,886 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 29 [2021-05-02 17:17:05,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:05,886 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2021-05-02 17:17:05,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 17:17:05,887 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2021-05-02 17:17:05,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 17:17:05,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:05,888 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:06,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:06,101 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:06,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:06,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1415216747, now seen corresponding path program 2 times [2021-05-02 17:17:06,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:06,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394941643] [2021-05-02 17:17:06,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:06,119 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:06,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [437693750] [2021-05-02 17:17:06,119 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 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 17:17:06,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:17:06,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:06,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 17:17:06,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:06,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:06,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:06,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:06,366 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 4 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:17:06,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:06,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394941643] [2021-05-02 17:17:06,367 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:06,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [437693750] [2021-05-02 17:17:06,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [437693750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:06,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:06,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:17:06,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746611552] [2021-05-02 17:17:06,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:17:06,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:06,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:17:06,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:17:06,369 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:17:08,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:08,500 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 17:17:08,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:17:08,501 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 17:17:08,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:08,501 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:17:08,501 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:17:08,502 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 53.8ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:17:08,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:17:08,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2021-05-02 17:17:08,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 6 states have return successors, (10), 8 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:17:08,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 54 transitions. [2021-05-02 17:17:08,507 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 54 transitions. Word has length 36 [2021-05-02 17:17:08,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:08,508 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 54 transitions. [2021-05-02 17:17:08,508 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 17:17:08,508 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 54 transitions. [2021-05-02 17:17:08,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 17:17:08,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:08,509 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 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 17:17:08,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:08,709 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:08,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:08,710 INFO L82 PathProgramCache]: Analyzing trace with hash 463554397, now seen corresponding path program 1 times [2021-05-02 17:17:08,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:08,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319158091] [2021-05-02 17:17:08,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:08,718 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:08,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1073140234] [2021-05-02 17:17:08,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:08,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:17:08,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:17:08,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:08,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:08,937 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-05-02 17:17:08,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:08,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319158091] [2021-05-02 17:17:08,942 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:08,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073140234] [2021-05-02 17:17:08,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073140234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:08,942 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:08,942 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:17:08,942 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546618667] [2021-05-02 17:17:08,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:17:08,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:08,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:17:08,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:17:08,944 INFO L87 Difference]: Start difference. First operand 47 states and 54 transitions. Second operand has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:17:09,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:17:09,055 INFO L93 Difference]: Finished difference Result 56 states and 62 transitions. [2021-05-02 17:17:09,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:17:09,056 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 40 [2021-05-02 17:17:09,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:17:09,058 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:17:09,058 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:17:09,058 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 79.0ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:17:09,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:17:09,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2021-05-02 17:17:09,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 30 states have internal predecessors, (31), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:17:09,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 17:17:09,064 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 17:17:09,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:17:09,064 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 17:17:09,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 17:17:09,064 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 17:17:09,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:17:09,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:17:09,065 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:17:09,282 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:17:09,283 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:17:09,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:17:09,283 INFO L82 PathProgramCache]: Analyzing trace with hash 380668603, now seen corresponding path program 3 times [2021-05-02 17:17:09,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:17:09,284 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642138634] [2021-05-02 17:17:09,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:17:09,292 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:17:09,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [98903955] [2021-05-02 17:17:09,292 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 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 17:17:09,339 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:17:09,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:17:09,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:17:09,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:17:11,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:11,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:17:11,483 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 17:17:11,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:17:11,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642138634] [2021-05-02 17:17:11,484 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:17:11,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [98903955] [2021-05-02 17:17:11,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [98903955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:17:11,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:17:11,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:17:11,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58091216] [2021-05-02 17:17:11,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:17:11,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:17:11,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:17:11,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=29, Unknown=1, NotChecked=0, Total=42 [2021-05-02 17:17:11,485 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:20:27,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:27,828 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 17:20:27,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:20:27,828 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 43 [2021-05-02 17:20:27,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:27,829 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:20:27,829 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:20:27,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 191925.6ms TimeCoverageRelationStatistics Valid=23, Invalid=47, Unknown=2, NotChecked=0, Total=72 [2021-05-02 17:20:27,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:20:27,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2021-05-02 17:20:27,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:20:27,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 17:20:27,835 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 43 [2021-05-02 17:20:27,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:27,835 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 17:20:27,835 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 17:20:27,835 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 17:20:27,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:20:27,836 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:27,836 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:28,038 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:20:28,039 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:28,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:28,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1886956461, now seen corresponding path program 2 times [2021-05-02 17:20:28,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:28,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483155890] [2021-05-02 17:20:28,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:28,046 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:28,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1963633622] [2021-05-02 17:20:28,047 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 17:20:28,108 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:20:28,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:28,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 17:20:28,110 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:28,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:28,263 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 11 proven. 9 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 17:20:28,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:28,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483155890] [2021-05-02 17:20:28,264 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:28,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963633622] [2021-05-02 17:20:28,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963633622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:28,266 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:28,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:20:28,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369777672] [2021-05-02 17:20:28,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:20:28,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:28,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:20:28,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:20:28,267 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:20:28,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:28,385 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-05-02 17:20:28,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:20:28,385 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) Word has length 47 [2021-05-02 17:20:28,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:28,388 INFO L225 Difference]: With dead ends: 51 [2021-05-02 17:20:28,388 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:20:28,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 84.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:20:28,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:20:28,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:20:28,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 27 states have (on average 1.037037037037037) internal successors, (28), 27 states have internal predecessors, (28), 10 states have call successors, (10), 7 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 17:20:28,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2021-05-02 17:20:28,404 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 47 [2021-05-02 17:20:28,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:28,404 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2021-05-02 17:20:28,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 6 states have call predecessors, (7), 5 states have call successors, (7) [2021-05-02 17:20:28,404 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2021-05-02 17:20:28,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 17:20:28,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:28,405 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:28,620 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:20:28,621 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:28,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:28,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1213805219, now seen corresponding path program 3 times [2021-05-02 17:20:28,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:28,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427238745] [2021-05-02 17:20:28,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:28,628 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:28,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1235964406] [2021-05-02 17:20:28,628 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 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 17:20:28,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:20:28,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:28,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 17:20:28,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:29,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,144 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,195 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 9 proven. 31 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 17:20:29,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:29,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427238745] [2021-05-02 17:20:29,195 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:29,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235964406] [2021-05-02 17:20:29,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235964406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:29,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:29,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:20:29,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605705355] [2021-05-02 17:20:29,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:20:29,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:29,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:20:29,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:20:29,196 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:20:29,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:29,343 INFO L93 Difference]: Finished difference Result 52 states and 57 transitions. [2021-05-02 17:20:29,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:20:29,343 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) Word has length 54 [2021-05-02 17:20:29,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:29,344 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:20:29,344 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:20:29,344 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 98.9ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:20:29,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:20:29,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 17:20:29,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 29 states have (on average 1.0344827586206897) internal successors, (30), 29 states have internal predecessors, (30), 11 states have call successors, (11), 7 states have call predecessors, (11), 5 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:20:29,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 17:20:29,350 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 54 [2021-05-02 17:20:29,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:29,350 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 17:20:29,350 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.4) internal successors, (24), 10 states have internal predecessors, (24), 6 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 6 states have call predecessors, (8), 6 states have call successors, (8) [2021-05-02 17:20:29,350 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 17:20:29,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:20:29,351 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:29,351 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:29,555 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:20:29,557 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:29,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:29,558 INFO L82 PathProgramCache]: Analyzing trace with hash 307258797, now seen corresponding path program 4 times [2021-05-02 17:20:29,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:29,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [49965867] [2021-05-02 17:20:29,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:29,569 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:29,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1573739343] [2021-05-02 17:20:29,569 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 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 17:20:29,603 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:20:29,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:29,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:20:29,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:29,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:29,773 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 30 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:20:29,773 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:29,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [49965867] [2021-05-02 17:20:29,773 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:29,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573739343] [2021-05-02 17:20:29,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573739343] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:29,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:29,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:20:29,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959233613] [2021-05-02 17:20:29,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:20:29,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:29,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:20:29,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:20:29,774 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-05-02 17:20:29,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:29,871 INFO L93 Difference]: Finished difference Result 55 states and 61 transitions. [2021-05-02 17:20:29,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:20:29,872 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) Word has length 61 [2021-05-02 17:20:29,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:29,872 INFO L225 Difference]: With dead ends: 55 [2021-05-02 17:20:29,872 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:20:29,873 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 77.8ms TimeCoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:20:29,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:20:29,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-05-02 17:20:29,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 31 states have (on average 1.032258064516129) internal successors, (32), 31 states have internal predecessors, (32), 12 states have call successors, (12), 7 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:20:29,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2021-05-02 17:20:29,879 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 61 [2021-05-02 17:20:29,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:29,879 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2021-05-02 17:20:29,879 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 9 states have internal predecessors, (23), 7 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (9), 7 states have call predecessors, (9), 7 states have call successors, (9) [2021-05-02 17:20:29,879 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2021-05-02 17:20:29,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 17:20:29,880 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:29,880 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:30,100 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 17:20:30,100 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:30,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:30,101 INFO L82 PathProgramCache]: Analyzing trace with hash 1082774365, now seen corresponding path program 5 times [2021-05-02 17:20:30,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:30,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943390792] [2021-05-02 17:20:30,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:30,106 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:30,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [422062155] [2021-05-02 17:20:30,106 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 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 17:20:30,598 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:20:30,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:30,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 17:20:30,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:30,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:30,831 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 16 proven. 61 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 17:20:30,832 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:30,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943390792] [2021-05-02 17:20:30,832 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:30,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [422062155] [2021-05-02 17:20:30,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [422062155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:30,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:30,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:20:30,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622558912] [2021-05-02 17:20:30,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:20:30,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:30,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:20:30,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:20:30,833 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:20:31,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:31,011 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2021-05-02 17:20:31,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:20:31,011 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 68 [2021-05-02 17:20:31,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:31,013 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:20:31,013 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 17:20:31,013 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 144.3ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:20:31,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 17:20:31,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-05-02 17:20:31,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 33 states have (on average 1.0303030303030303) internal successors, (34), 33 states have internal predecessors, (34), 13 states have call successors, (13), 7 states have call predecessors, (13), 5 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 17:20:31,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2021-05-02 17:20:31,029 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 68 [2021-05-02 17:20:31,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:31,029 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2021-05-02 17:20:31,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.3333333333333335) internal successors, (28), 12 states have internal predecessors, (28), 8 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2021-05-02 17:20:31,030 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2021-05-02 17:20:31,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:20:31,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:31,033 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:31,237 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:20:31,237 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:31,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:31,238 INFO L82 PathProgramCache]: Analyzing trace with hash -1692754003, now seen corresponding path program 6 times [2021-05-02 17:20:31,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:31,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1938105491] [2021-05-02 17:20:31,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:31,244 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:31,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1505554110] [2021-05-02 17:20:31,244 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 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 17:20:32,447 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:20:32,447 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:32,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 17:20:32,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:34,552 WARN L205 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 18 DAG size of output: 6 [2021-05-02 17:20:34,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,717 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,718 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:34,759 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 15 proven. 85 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-05-02 17:20:34,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:34,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1938105491] [2021-05-02 17:20:34,759 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:34,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505554110] [2021-05-02 17:20:34,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505554110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:34,759 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:34,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 17:20:34,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780505125] [2021-05-02 17:20:34,761 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:20:34,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:34,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:20:34,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:20:34,761 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 9 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2021-05-02 17:20:34,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:34,965 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-02 17:20:34,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:20:34,966 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 9 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) Word has length 75 [2021-05-02 17:20:34,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:34,966 INFO L225 Difference]: With dead ends: 61 [2021-05-02 17:20:34,966 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 17:20:34,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 2200.2ms TimeCoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:20:34,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 17:20:34,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 17:20:34,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.0285714285714285) internal successors, (36), 35 states have internal predecessors, (36), 14 states have call successors, (14), 7 states have call predecessors, (14), 5 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 17:20:34,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-05-02 17:20:34,972 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 75 [2021-05-02 17:20:34,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:34,972 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-05-02 17:20:34,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 13 states have internal predecessors, (30), 9 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2021-05-02 17:20:34,973 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-05-02 17:20:34,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 17:20:34,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:34,973 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 7, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:35,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 17:20:35,179 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:35,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:35,179 INFO L82 PathProgramCache]: Analyzing trace with hash 615143773, now seen corresponding path program 7 times [2021-05-02 17:20:35,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:35,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237881256] [2021-05-02 17:20:35,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:35,190 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:35,190 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [674064823] [2021-05-02 17:20:35,190 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 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 17:20:39,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:20:39,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 44 conjunts are in the unsatisfiable core [2021-05-02 17:20:39,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:39,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:39,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,062 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,103 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:40,137 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 18 proven. 87 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-05-02 17:20:40,138 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:40,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237881256] [2021-05-02 17:20:40,138 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:40,138 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674064823] [2021-05-02 17:20:40,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674064823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:40,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:40,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 17:20:40,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483057343] [2021-05-02 17:20:40,138 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:20:40,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:40,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:20:40,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:20:40,139 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-02 17:20:40,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:40,388 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2021-05-02 17:20:40,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:20:40,388 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) Word has length 82 [2021-05-02 17:20:40,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:40,389 INFO L225 Difference]: With dead ends: 66 [2021-05-02 17:20:40,389 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 17:20:40,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 179.2ms TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:20:40,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 17:20:40,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2021-05-02 17:20:40,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 37 states have (on average 1.027027027027027) internal successors, (38), 37 states have internal predecessors, (38), 15 states have call successors, (15), 7 states have call predecessors, (15), 5 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 17:20:40,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 17:20:40,395 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 82 [2021-05-02 17:20:40,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:40,395 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 17:20:40,395 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 14 states have internal predecessors, (32), 11 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-02 17:20:40,395 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 17:20:40,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 17:20:40,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:40,396 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 9, 9, 9, 8, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:40,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:20:40,605 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:40,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:40,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1334355539, now seen corresponding path program 8 times [2021-05-02 17:20:40,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:40,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50756471] [2021-05-02 17:20:40,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:40,611 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:40,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [176493226] [2021-05-02 17:20:40,611 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 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 17:20:41,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:20:41,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:20:41,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 17:20:41,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:20:41,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,862 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:20:41,882 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 23 proven. 108 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2021-05-02 17:20:41,883 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:20:41,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50756471] [2021-05-02 17:20:41,883 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:20:41,883 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176493226] [2021-05-02 17:20:41,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176493226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:20:41,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:20:41,883 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 17:20:41,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858081184] [2021-05-02 17:20:41,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:20:41,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:20:41,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:20:41,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:20:41,884 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-05-02 17:20:42,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:20:42,145 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2021-05-02 17:20:42,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:20:42,145 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) Word has length 89 [2021-05-02 17:20:42,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:20:42,146 INFO L225 Difference]: With dead ends: 69 [2021-05-02 17:20:42,146 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 17:20:42,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 172.0ms TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:20:42,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 17:20:42,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-05-02 17:20:42,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 39 states have (on average 1.0256410256410255) internal successors, (40), 39 states have internal predecessors, (40), 16 states have call successors, (16), 7 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 17:20:42,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2021-05-02 17:20:42,157 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 89 [2021-05-02 17:20:42,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:20:42,157 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2021-05-02 17:20:42,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.125) internal successors, (34), 15 states have internal predecessors, (34), 11 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 12 states have call predecessors, (13), 11 states have call successors, (13) [2021-05-02 17:20:42,157 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2021-05-02 17:20:42,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-05-02 17:20:42,158 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:20:42,158 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:20:42,362 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:20:42,362 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:20:42,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:20:42,362 INFO L82 PathProgramCache]: Analyzing trace with hash 711483229, now seen corresponding path program 9 times [2021-05-02 17:20:42,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:20:42,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603427087] [2021-05-02 17:20:42,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:20:42,372 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:20:42,372 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [501049512] [2021-05-02 17:20:42,372 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 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 17:21:27,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:21:27,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:21:27,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 17:21:27,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:21:27,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,518 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:27,837 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 69 proven. 172 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-05-02 17:21:27,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:21:27,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603427087] [2021-05-02 17:21:27,837 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:21:27,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501049512] [2021-05-02 17:21:27,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501049512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:21:27,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:21:27,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2021-05-02 17:21:27,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675443100] [2021-05-02 17:21:27,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:21:27,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:21:27,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:21:27,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=376, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:21:27,838 INFO L87 Difference]: Start difference. First operand 61 states and 70 transitions. Second operand has 21 states, 20 states have (on average 1.8) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) [2021-05-02 17:21:59,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:21:59,015 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2021-05-02 17:21:59,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:21:59,015 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) Word has length 96 [2021-05-02 17:21:59,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:21:59,016 INFO L225 Difference]: With dead ends: 70 [2021-05-02 17:21:59,016 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 17:21:59,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 543.0ms TimeCoverageRelationStatistics Valid=60, Invalid=492, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:21:59,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 17:21:59,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 17:21:59,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 41 states have (on average 1.024390243902439) internal successors, (42), 41 states have internal predecessors, (42), 17 states have call successors, (17), 7 states have call predecessors, (17), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 17:21:59,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2021-05-02 17:21:59,046 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 96 [2021-05-02 17:21:59,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:21:59,046 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2021-05-02 17:21:59,046 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 20 states have (on average 1.8) internal successors, (36), 16 states have internal predecessors, (36), 12 states have call successors, (16), 2 states have call predecessors, (16), 2 states have return successors, (14), 12 states have call predecessors, (14), 12 states have call successors, (14) [2021-05-02 17:21:59,046 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2021-05-02 17:21:59,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 17:21:59,047 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:21:59,048 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 11, 11, 11, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:21:59,256 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 17:21:59,257 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:21:59,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:21:59,257 INFO L82 PathProgramCache]: Analyzing trace with hash -1610181715, now seen corresponding path program 10 times [2021-05-02 17:21:59,257 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:21:59,257 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99636046] [2021-05-02 17:21:59,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:21:59,262 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:21:59,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [774736068] [2021-05-02 17:21:59,262 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 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 17:21:59,303 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:21:59,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:21:59,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 17:21:59,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:21:59,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,498 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,522 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:21:59,568 INFO L134 CoverageAnalysis]: Checked inductivity of 457 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2021-05-02 17:21:59,568 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:21:59,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99636046] [2021-05-02 17:21:59,568 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:21:59,568 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774736068] [2021-05-02 17:21:59,568 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774736068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:21:59,568 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:21:59,568 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 17:21:59,568 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743237473] [2021-05-02 17:21:59,569 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:21:59,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:21:59,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:21:59,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:21:59,569 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 13 states have call predecessors, (15), 13 states have call successors, (15) [2021-05-02 17:21:59,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:21:59,796 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2021-05-02 17:21:59,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:21:59,796 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 13 states have call predecessors, (15), 13 states have call successors, (15) Word has length 103 [2021-05-02 17:21:59,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:21:59,797 INFO L225 Difference]: With dead ends: 73 [2021-05-02 17:21:59,797 INFO L226 Difference]: Without dead ends: 67 [2021-05-02 17:21:59,797 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 148.8ms TimeCoverageRelationStatistics Valid=37, Invalid=269, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:21:59,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-05-02 17:21:59,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2021-05-02 17:21:59,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 43 states have (on average 1.0232558139534884) internal successors, (44), 43 states have internal predecessors, (44), 18 states have call successors, (18), 7 states have call predecessors, (18), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 17:21:59,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 78 transitions. [2021-05-02 17:21:59,808 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 78 transitions. Word has length 103 [2021-05-02 17:21:59,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:21:59,809 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 78 transitions. [2021-05-02 17:21:59,809 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 15 states have internal predecessors, (35), 13 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (15), 13 states have call predecessors, (15), 13 states have call successors, (15) [2021-05-02 17:21:59,809 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 78 transitions. [2021-05-02 17:21:59,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 17:21:59,810 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:21:59,810 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:22:00,026 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:22:00,026 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:22:00,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:22:00,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1881400669, now seen corresponding path program 11 times [2021-05-02 17:22:00,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:22:00,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [632562351] [2021-05-02 17:22:00,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:22:00,044 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:22:00,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2020868754] [2021-05-02 17:22:00,044 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 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